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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

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1+/*
2+ * Copyright (c) 1996, 2011, Oracle and/or its affiliates. All rights reserved.
3+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4+ *
5+ * This code is free software; you can redistribute it and/or modify it
6+ * under the terms of the GNU General Public License version 2 only, as
7+ * published by the Free Software Foundation. Oracle designates this
8+ * particular file as subject to the "Classpath" exception as provided
9+ * by Oracle in the LICENSE file that accompanied this code.
10+ *
11+ * This code is distributed in the hope that it will be useful, but WITHOUT
12+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14+ * version 2 for more details (a copy is included in the LICENSE file that
15+ * accompanied this code).
16+ *
17+ * You should have received a copy of the GNU General Public License version
18+ * 2 along with this work; if not, write to the Free Software Foundation,
19+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20+ *
21+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22+ * or visit www.oracle.com if you need additional information or have any
23+ * questions.
24+ */
25+
26+package java.io;
27+
28+import java.lang.ref.Reference;
29+import java.lang.ref.ReferenceQueue;
30+import java.lang.ref.SoftReference;
31+import java.lang.ref.WeakReference;
32+import java.lang.reflect.Constructor;
33+import java.lang.reflect.Field;
34+import java.lang.reflect.InvocationTargetException;
35+import java.lang.reflect.Member;
36+import java.lang.reflect.Method;
37+import java.lang.reflect.Modifier;
38+import java.lang.reflect.Proxy;
39+import java.security.AccessController;
40+import java.security.MessageDigest;
41+import java.security.NoSuchAlgorithmException;
42+import java.security.PrivilegedAction;
43+import java.util.ArrayList;
44+import java.util.Arrays;
45+import java.util.Collections;
46+import java.util.Comparator;
47+import java.util.HashSet;
48+import java.util.Set;
49+import java.util.concurrent.ConcurrentHashMap;
50+import java.util.concurrent.ConcurrentMap;
51+import sun.misc.Unsafe;
52+import sun.reflect.ReflectionFactory;
53+
54+/**
55+ * Serialization's descriptor for classes. It contains the name and
56+ * serialVersionUID of the class. The ObjectStreamClass for a specific class
57+ * loaded in this Java VM can be found/created using the lookup method.
58+ *
59+ * <p>The algorithm to compute the SerialVersionUID is described in
60+ * <a href="../../../platform/serialization/spec/class.html#4100">Object
61+ * Serialization Specification, Section 4.6, Stream Unique Identifiers</a>.
62+ *
63+ * @author Mike Warres
64+ * @author Roger Riggs
65+ * @see ObjectStreamField
66+ * @see <a href="../../../platform/serialization/spec/class.html">Object Serialization Specification, Section 4, Class Descriptors</a>
67+ * @since JDK1.1
68+ */
69+public class ObjectStreamClass implements Serializable {
70+
71+ /** serialPersistentFields value indicating no serializable fields */
72+ public static final ObjectStreamField[] NO_FIELDS =
73+ new ObjectStreamField[0];
74+
75+ private static final long serialVersionUID = -6120832682080437368L;
76+ private static final ObjectStreamField[] serialPersistentFields =
77+ NO_FIELDS;
78+
79+ /** reflection factory for obtaining serialization constructors */
80+ private static final ReflectionFactory reflFactory =
81+ AccessController.doPrivileged(
82+ new ReflectionFactory.GetReflectionFactoryAction());
83+
84+ private static class Caches {
85+ /** cache mapping local classes -> descriptors */
86+ static final ConcurrentMap<WeakClassKey,Reference<?>> localDescs =
87+ new ConcurrentHashMap<>();
88+
89+ /** cache mapping field group/local desc pairs -> field reflectors */
90+ static final ConcurrentMap<FieldReflectorKey,Reference<?>> reflectors =
91+ new ConcurrentHashMap<>();
92+
93+ /** queue for WeakReferences to local classes */
94+ private static final ReferenceQueue<Class<?>> localDescsQueue =
95+ new ReferenceQueue<>();
96+ /** queue for WeakReferences to field reflectors keys */
97+ private static final ReferenceQueue<Class<?>> reflectorsQueue =
98+ new ReferenceQueue<>();
99+ }
100+
101+ /** class associated with this descriptor (if any) */
102+ private Class<?> cl;
103+ /** name of class represented by this descriptor */
104+ private String name;
105+ /** serialVersionUID of represented class (null if not computed yet) */
106+ private volatile Long suid;
107+
108+ /** true if represents dynamic proxy class */
109+ private boolean isProxy;
110+ /** true if represents enum type */
111+ private boolean isEnum;
112+ /** true if represented class implements Serializable */
113+ private boolean serializable;
114+ /** true if represented class implements Externalizable */
115+ private boolean externalizable;
116+ /** true if desc has data written by class-defined writeObject method */
117+ private boolean hasWriteObjectData;
118+ /**
119+ * true if desc has externalizable data written in block data format; this
120+ * must be true by default to accommodate ObjectInputStream subclasses which
121+ * override readClassDescriptor() to return class descriptors obtained from
122+ * ObjectStreamClass.lookup() (see 4461737)
123+ */
124+ private boolean hasBlockExternalData = true;
125+
126+ /** exception (if any) thrown while attempting to resolve class */
127+ private ClassNotFoundException resolveEx;
128+ /** exception (if any) to throw if non-enum deserialization attempted */
129+ private InvalidClassException deserializeEx;
130+ /** exception (if any) to throw if non-enum serialization attempted */
131+ private InvalidClassException serializeEx;
132+ /** exception (if any) to throw if default serialization attempted */
133+ private InvalidClassException defaultSerializeEx;
134+
135+ /** serializable fields */
136+ private ObjectStreamField[] fields;
137+ /** aggregate marshalled size of primitive fields */
138+ private int primDataSize;
139+ /** number of non-primitive fields */
140+ private int numObjFields;
141+ /** reflector for setting/getting serializable field values */
142+ private FieldReflector fieldRefl;
143+ /** data layout of serialized objects described by this class desc */
144+ private volatile ClassDataSlot[] dataLayout;
145+
146+ /** serialization-appropriate constructor, or null if none */
147+ private Constructor cons;
148+ /** class-defined writeObject method, or null if none */
149+ private Method writeObjectMethod;
150+ /** class-defined readObject method, or null if none */
151+ private Method readObjectMethod;
152+ /** class-defined readObjectNoData method, or null if none */
153+ private Method readObjectNoDataMethod;
154+ /** class-defined writeReplace method, or null if none */
155+ private Method writeReplaceMethod;
156+ /** class-defined readResolve method, or null if none */
157+ private Method readResolveMethod;
158+
159+ /** local class descriptor for represented class (may point to self) */
160+ private ObjectStreamClass localDesc;
161+ /** superclass descriptor appearing in stream */
162+ private ObjectStreamClass superDesc;
163+
164+ /**
165+ * Initializes native code.
166+ */
167+ private static native void initNative();
168+ static {
169+ initNative();
170+ }
171+
172+ /**
173+ * Find the descriptor for a class that can be serialized. Creates an
174+ * ObjectStreamClass instance if one does not exist yet for class. Null is
175+ * returned if the specified class does not implement java.io.Serializable
176+ * or java.io.Externalizable.
177+ *
178+ * @param cl class for which to get the descriptor
179+ * @return the class descriptor for the specified class
180+ */
181+ public static ObjectStreamClass lookup(Class<?> cl) {
182+ return lookup(cl, false);
183+ }
184+
185+ /**
186+ * Returns the descriptor for any class, regardless of whether it
187+ * implements {@link Serializable}.
188+ *
189+ * @param cl class for which to get the descriptor
190+ * @return the class descriptor for the specified class
191+ * @since 1.6
192+ */
193+ public static ObjectStreamClass lookupAny(Class<?> cl) {
194+ return lookup(cl, true);
195+ }
196+
197+ /**
198+ * Returns the name of the class described by this descriptor.
199+ * This method returns the name of the class in the format that
200+ * is used by the {@link Class#getName} method.
201+ *
202+ * @return a string representing the name of the class
203+ */
204+ public String getName() {
205+ return name;
206+ }
207+
208+ /**
209+ * Return the serialVersionUID for this class. The serialVersionUID
210+ * defines a set of classes all with the same name that have evolved from a
211+ * common root class and agree to be serialized and deserialized using a
212+ * common format. NonSerializable classes have a serialVersionUID of 0L.
213+ *
214+ * @return the SUID of the class described by this descriptor
215+ */
216+ public long getSerialVersionUID() {
217+ // REMIND: synchronize instead of relying on volatile?
218+ if (suid == null) {
219+ suid = AccessController.doPrivileged(
220+ new PrivilegedAction<Long>() {
221+ public Long run() {
222+ return computeDefaultSUID(cl);
223+ }
224+ }
225+ );
226+ }
227+ return suid.longValue();
228+ }
229+
230+ /**
231+ * Return the class in the local VM that this version is mapped to. Null
232+ * is returned if there is no corresponding local class.
233+ *
234+ * @return the <code>Class</code> instance that this descriptor represents
235+ */
236+ public Class<?> forClass() {
237+ return cl;
238+ }
239+
240+ /**
241+ * Return an array of the fields of this serializable class.
242+ *
243+ * @return an array containing an element for each persistent field of
244+ * this class. Returns an array of length zero if there are no
245+ * fields.
246+ * @since 1.2
247+ */
248+ public ObjectStreamField[] getFields() {
249+ return getFields(true);
250+ }
251+
252+ /**
253+ * Get the field of this class by name.
254+ *
255+ * @param name the name of the data field to look for
256+ * @return The ObjectStreamField object of the named field or null if
257+ * there is no such named field.
258+ */
259+ public ObjectStreamField getField(String name) {
260+ return getField(name, null);
261+ }
262+
263+ /**
264+ * Return a string describing this ObjectStreamClass.
265+ */
266+ public String toString() {
267+ return name + ": static final long serialVersionUID = " +
268+ getSerialVersionUID() + "L;";
269+ }
270+
271+ /**
272+ * Looks up and returns class descriptor for given class, or null if class
273+ * is non-serializable and "all" is set to false.
274+ *
275+ * @param cl class to look up
276+ * @param all if true, return descriptors for all classes; if false, only
277+ * return descriptors for serializable classes
278+ */
279+ static ObjectStreamClass lookup(Class<?> cl, boolean all) {
280+ if (!(all || Serializable.class.isAssignableFrom(cl))) {
281+ return null;
282+ }
283+ processQueue(Caches.localDescsQueue, Caches.localDescs);
284+ WeakClassKey key = new WeakClassKey(cl, Caches.localDescsQueue);
285+ Reference<?> ref = Caches.localDescs.get(key);
286+ Object entry = null;
287+ if (ref != null) {
288+ entry = ref.get();
289+ }
290+ EntryFuture future = null;
291+ if (entry == null) {
292+ EntryFuture newEntry = new EntryFuture();
293+ Reference<?> newRef = new SoftReference<>(newEntry);
294+ do {
295+ if (ref != null) {
296+ Caches.localDescs.remove(key, ref);
297+ }
298+ ref = Caches.localDescs.putIfAbsent(key, newRef);
299+ if (ref != null) {
300+ entry = ref.get();
301+ }
302+ } while (ref != null && entry == null);
303+ if (entry == null) {
304+ future = newEntry;
305+ }
306+ }
307+
308+ if (entry instanceof ObjectStreamClass) { // check common case first
309+ return (ObjectStreamClass) entry;
310+ }
311+ if (entry instanceof EntryFuture) {
312+ future = (EntryFuture) entry;
313+ if (future.getOwner() == Thread.currentThread()) {
314+ /*
315+ * Handle nested call situation described by 4803747: waiting
316+ * for future value to be set by a lookup() call further up the
317+ * stack will result in deadlock, so calculate and set the
318+ * future value here instead.
319+ */
320+ entry = null;
321+ } else {
322+ entry = future.get();
323+ }
324+ }
325+ if (entry == null) {
326+ try {
327+ entry = new ObjectStreamClass(cl);
328+ } catch (Throwable th) {
329+ entry = th;
330+ }
331+ if (future.set(entry)) {
332+ Caches.localDescs.put(key, new SoftReference<Object>(entry));
333+ } else {
334+ // nested lookup call already set future
335+ entry = future.get();
336+ }
337+ }
338+
339+ if (entry instanceof ObjectStreamClass) {
340+ return (ObjectStreamClass) entry;
341+ } else if (entry instanceof RuntimeException) {
342+ throw (RuntimeException) entry;
343+ } else if (entry instanceof Error) {
344+ throw (Error) entry;
345+ } else {
346+ throw new InternalError("unexpected entry: " + entry);
347+ }
348+ }
349+
350+ /**
351+ * Placeholder used in class descriptor and field reflector lookup tables
352+ * for an entry in the process of being initialized. (Internal) callers
353+ * which receive an EntryFuture belonging to another thread as the result
354+ * of a lookup should call the get() method of the EntryFuture; this will
355+ * return the actual entry once it is ready for use and has been set(). To
356+ * conserve objects, EntryFutures synchronize on themselves.
357+ */
358+ private static class EntryFuture {
359+
360+ private static final Object unset = new Object();
361+ private final Thread owner = Thread.currentThread();
362+ private Object entry = unset;
363+
364+ /**
365+ * Attempts to set the value contained by this EntryFuture. If the
366+ * EntryFuture's value has not been set already, then the value is
367+ * saved, any callers blocked in the get() method are notified, and
368+ * true is returned. If the value has already been set, then no saving
369+ * or notification occurs, and false is returned.
370+ */
371+ synchronized boolean set(Object entry) {
372+ if (this.entry != unset) {
373+ return false;
374+ }
375+ this.entry = entry;
376+ notifyAll();
377+ return true;
378+ }
379+
380+ /**
381+ * Returns the value contained by this EntryFuture, blocking if
382+ * necessary until a value is set.
383+ */
384+ synchronized Object get() {
385+ boolean interrupted = false;
386+ while (entry == unset) {
387+ try {
388+ wait();
389+ } catch (InterruptedException ex) {
390+ interrupted = true;
391+ }
392+ }
393+ if (interrupted) {
394+ AccessController.doPrivileged(
395+ new PrivilegedAction<Void>() {
396+ public Void run() {
397+ Thread.currentThread().interrupt();
398+ return null;
399+ }
400+ }
401+ );
402+ }
403+ return entry;
404+ }
405+
406+ /**
407+ * Returns the thread that created this EntryFuture.
408+ */
409+ Thread getOwner() {
410+ return owner;
411+ }
412+ }
413+
414+ /**
415+ * Creates local class descriptor representing given class.
416+ */
417+ private ObjectStreamClass(final Class<?> cl) {
418+ this.cl = cl;
419+ name = cl.getName();
420+ isProxy = Proxy.isProxyClass(cl);
421+ isEnum = Enum.class.isAssignableFrom(cl);
422+ serializable = Serializable.class.isAssignableFrom(cl);
423+ externalizable = Externalizable.class.isAssignableFrom(cl);
424+
425+ Class<?> superCl = cl.getSuperclass();
426+ superDesc = (superCl != null) ? lookup(superCl, false) : null;
427+ localDesc = this;
428+
429+ if (serializable) {
430+ AccessController.doPrivileged(new PrivilegedAction<Void>() {
431+ public Void run() {
432+ if (isEnum) {
433+ suid = Long.valueOf(0);
434+ fields = NO_FIELDS;
435+ return null;
436+ }
437+ if (cl.isArray()) {
438+ fields = NO_FIELDS;
439+ return null;
440+ }
441+
442+ suid = getDeclaredSUID(cl);
443+ try {
444+ fields = getSerialFields(cl);
445+ computeFieldOffsets();
446+ } catch (InvalidClassException e) {
447+ serializeEx = deserializeEx = e;
448+ fields = NO_FIELDS;
449+ }
450+
451+ if (externalizable) {
452+ cons = getExternalizableConstructor(cl);
453+ } else {
454+ cons = getSerializableConstructor(cl);
455+ writeObjectMethod = getPrivateMethod(cl, "writeObject",
456+ new Class<?>[] { ObjectOutputStream.class },
457+ Void.TYPE);
458+ readObjectMethod = getPrivateMethod(cl, "readObject",
459+ new Class<?>[] { ObjectInputStream.class },
460+ Void.TYPE);
461+ readObjectNoDataMethod = getPrivateMethod(
462+ cl, "readObjectNoData", null, Void.TYPE);
463+ hasWriteObjectData = (writeObjectMethod != null);
464+ }
465+ writeReplaceMethod = getInheritableMethod(
466+ cl, "writeReplace", null, Object.class);
467+ readResolveMethod = getInheritableMethod(
468+ cl, "readResolve", null, Object.class);
469+ return null;
470+ }
471+ });
472+ } else {
473+ suid = Long.valueOf(0);
474+ fields = NO_FIELDS;
475+ }
476+
477+ try {
478+ fieldRefl = getReflector(fields, this);
479+ } catch (InvalidClassException ex) {
480+ // field mismatches impossible when matching local fields vs. self
481+ throw new InternalError();
482+ }
483+
484+ if (deserializeEx == null) {
485+ if (isEnum) {
486+ deserializeEx = new InvalidClassException(name, "enum type");
487+ } else if (cons == null) {
488+ deserializeEx = new InvalidClassException(
489+ name, "no valid constructor");
490+ }
491+ }
492+ for (int i = 0; i < fields.length; i++) {
493+ if (fields[i].getField() == null) {
494+ defaultSerializeEx = new InvalidClassException(
495+ name, "unmatched serializable field(s) declared");
496+ }
497+ }
498+ }
499+
500+ /**
501+ * Creates blank class descriptor which should be initialized via a
502+ * subsequent call to initProxy(), initNonProxy() or readNonProxy().
503+ */
504+ ObjectStreamClass() {
505+ }
506+
507+ /**
508+ * Initializes class descriptor representing a proxy class.
509+ */
510+ void initProxy(Class<?> cl,
511+ ClassNotFoundException resolveEx,
512+ ObjectStreamClass superDesc)
513+ throws InvalidClassException
514+ {
515+ this.cl = cl;
516+ this.resolveEx = resolveEx;
517+ this.superDesc = superDesc;
518+ isProxy = true;
519+ serializable = true;
520+ suid = Long.valueOf(0);
521+ fields = NO_FIELDS;
522+
523+ if (cl != null) {
524+ localDesc = lookup(cl, true);
525+ if (!localDesc.isProxy) {
526+ throw new InvalidClassException(
527+ "cannot bind proxy descriptor to a non-proxy class");
528+ }
529+ name = localDesc.name;
530+ externalizable = localDesc.externalizable;
531+ cons = localDesc.cons;
532+ writeReplaceMethod = localDesc.writeReplaceMethod;
533+ readResolveMethod = localDesc.readResolveMethod;
534+ deserializeEx = localDesc.deserializeEx;
535+ }
536+ fieldRefl = getReflector(fields, localDesc);
537+ }
538+
539+ /**
540+ * Initializes class descriptor representing a non-proxy class.
541+ */
542+ void initNonProxy(ObjectStreamClass model,
543+ Class<?> cl,
544+ ClassNotFoundException resolveEx,
545+ ObjectStreamClass superDesc)
546+ throws InvalidClassException
547+ {
548+ this.cl = cl;
549+ this.resolveEx = resolveEx;
550+ this.superDesc = superDesc;
551+ name = model.name;
552+ suid = Long.valueOf(model.getSerialVersionUID());
553+ isProxy = false;
554+ isEnum = model.isEnum;
555+ serializable = model.serializable;
556+ externalizable = model.externalizable;
557+ hasBlockExternalData = model.hasBlockExternalData;
558+ hasWriteObjectData = model.hasWriteObjectData;
559+ fields = model.fields;
560+ primDataSize = model.primDataSize;
561+ numObjFields = model.numObjFields;
562+
563+ if (cl != null) {
564+ localDesc = lookup(cl, true);
565+ if (localDesc.isProxy) {
566+ throw new InvalidClassException(
567+ "cannot bind non-proxy descriptor to a proxy class");
568+ }
569+ if (isEnum != localDesc.isEnum) {
570+ throw new InvalidClassException(isEnum ?
571+ "cannot bind enum descriptor to a non-enum class" :
572+ "cannot bind non-enum descriptor to an enum class");
573+ }
574+
575+ if (serializable == localDesc.serializable &&
576+ !cl.isArray() &&
577+ suid.longValue() != localDesc.getSerialVersionUID())
578+ {
579+ throw new InvalidClassException(localDesc.name,
580+ "local class incompatible: " +
581+ "stream classdesc serialVersionUID = " + suid +
582+ ", local class serialVersionUID = " +
583+ localDesc.getSerialVersionUID());
584+ }
585+
586+ if (!classNamesEqual(name, localDesc.name)) {
587+ throw new InvalidClassException(localDesc.name,
588+ "local class name incompatible with stream class " +
589+ "name \"" + name + "\"");
590+ }
591+
592+ if (!isEnum) {
593+ if ((serializable == localDesc.serializable) &&
594+ (externalizable != localDesc.externalizable))
595+ {
596+ throw new InvalidClassException(localDesc.name,
597+ "Serializable incompatible with Externalizable");
598+ }
599+
600+ if ((serializable != localDesc.serializable) ||
601+ (externalizable != localDesc.externalizable) ||
602+ !(serializable || externalizable))
603+ {
604+ deserializeEx = new InvalidClassException(localDesc.name,
605+ "class invalid for deserialization");
606+ }
607+ }
608+
609+ cons = localDesc.cons;
610+ writeObjectMethod = localDesc.writeObjectMethod;
611+ readObjectMethod = localDesc.readObjectMethod;
612+ readObjectNoDataMethod = localDesc.readObjectNoDataMethod;
613+ writeReplaceMethod = localDesc.writeReplaceMethod;
614+ readResolveMethod = localDesc.readResolveMethod;
615+ if (deserializeEx == null) {
616+ deserializeEx = localDesc.deserializeEx;
617+ }
618+ }
619+ fieldRefl = getReflector(fields, localDesc);
620+ // reassign to matched fields so as to reflect local unshared settings
621+ fields = fieldRefl.getFields();
622+ }
623+
624+ /**
625+ * Reads non-proxy class descriptor information from given input stream.
626+ * The resulting class descriptor is not fully functional; it can only be
627+ * used as input to the ObjectInputStream.resolveClass() and
628+ * ObjectStreamClass.initNonProxy() methods.
629+ */
630+ void readNonProxy(ObjectInputStream in)
631+ throws IOException, ClassNotFoundException
632+ {
633+ name = in.readUTF();
634+ suid = Long.valueOf(in.readLong());
635+ isProxy = false;
636+
637+ byte flags = in.readByte();
638+ hasWriteObjectData =
639+ ((flags & ObjectStreamConstants.SC_WRITE_METHOD) != 0);
640+ hasBlockExternalData =
641+ ((flags & ObjectStreamConstants.SC_BLOCK_DATA) != 0);
642+ externalizable =
643+ ((flags & ObjectStreamConstants.SC_EXTERNALIZABLE) != 0);
644+ boolean sflag =
645+ ((flags & ObjectStreamConstants.SC_SERIALIZABLE) != 0);
646+ if (externalizable && sflag) {
647+ throw new InvalidClassException(
648+ name, "serializable and externalizable flags conflict");
649+ }
650+ serializable = externalizable || sflag;
651+ isEnum = ((flags & ObjectStreamConstants.SC_ENUM) != 0);
652+ if (isEnum && suid.longValue() != 0L) {
653+ throw new InvalidClassException(name,
654+ "enum descriptor has non-zero serialVersionUID: " + suid);
655+ }
656+
657+ int numFields = in.readShort();
658+ if (isEnum && numFields != 0) {
659+ throw new InvalidClassException(name,
660+ "enum descriptor has non-zero field count: " + numFields);
661+ }
662+ fields = (numFields > 0) ?
663+ new ObjectStreamField[numFields] : NO_FIELDS;
664+ for (int i = 0; i < numFields; i++) {
665+ char tcode = (char) in.readByte();
666+ String fname = in.readUTF();
667+ String signature = ((tcode == 'L') || (tcode == '[')) ?
668+ in.readTypeString() : new String(new char[] { tcode });
669+ try {
670+ fields[i] = new ObjectStreamField(fname, signature, false);
671+ } catch (RuntimeException e) {
672+ throw (IOException) new InvalidClassException(name,
673+ "invalid descriptor for field " + fname).initCause(e);
674+ }
675+ }
676+ computeFieldOffsets();
677+ }
678+
679+ /**
680+ * Writes non-proxy class descriptor information to given output stream.
681+ */
682+ void writeNonProxy(ObjectOutputStream out) throws IOException {
683+ out.writeUTF(name);
684+ out.writeLong(getSerialVersionUID());
685+
686+ byte flags = 0;
687+ if (externalizable) {
688+ flags |= ObjectStreamConstants.SC_EXTERNALIZABLE;
689+ int protocol = out.getProtocolVersion();
690+ if (protocol != ObjectStreamConstants.PROTOCOL_VERSION_1) {
691+ flags |= ObjectStreamConstants.SC_BLOCK_DATA;
692+ }
693+ } else if (serializable) {
694+ flags |= ObjectStreamConstants.SC_SERIALIZABLE;
695+ }
696+ if (hasWriteObjectData) {
697+ flags |= ObjectStreamConstants.SC_WRITE_METHOD;
698+ }
699+ if (isEnum) {
700+ flags |= ObjectStreamConstants.SC_ENUM;
701+ }
702+ out.writeByte(flags);
703+
704+ out.writeShort(fields.length);
705+ for (int i = 0; i < fields.length; i++) {
706+ ObjectStreamField f = fields[i];
707+ out.writeByte(f.getTypeCode());
708+ out.writeUTF(f.getName());
709+ if (!f.isPrimitive()) {
710+ out.writeTypeString(f.getTypeString());
711+ }
712+ }
713+ }
714+
715+ /**
716+ * Returns ClassNotFoundException (if any) thrown while attempting to
717+ * resolve local class corresponding to this class descriptor.
718+ */
719+ ClassNotFoundException getResolveException() {
720+ return resolveEx;
721+ }
722+
723+ /**
724+ * Throws an InvalidClassException if object instances referencing this
725+ * class descriptor should not be allowed to deserialize. This method does
726+ * not apply to deserialization of enum constants.
727+ */
728+ void checkDeserialize() throws InvalidClassException {
729+ if (deserializeEx != null) {
730+ InvalidClassException ice =
731+ new InvalidClassException(deserializeEx.classname,
732+ deserializeEx.getMessage());
733+ ice.initCause(deserializeEx);
734+ throw ice;
735+ }
736+ }
737+
738+ /**
739+ * Throws an InvalidClassException if objects whose class is represented by
740+ * this descriptor should not be allowed to serialize. This method does
741+ * not apply to serialization of enum constants.
742+ */
743+ void checkSerialize() throws InvalidClassException {
744+ if (serializeEx != null) {
745+ InvalidClassException ice =
746+ new InvalidClassException(serializeEx.classname,
747+ serializeEx.getMessage());
748+ ice.initCause(serializeEx);
749+ throw ice;
750+ }
751+ }
752+
753+ /**
754+ * Throws an InvalidClassException if objects whose class is represented by
755+ * this descriptor should not be permitted to use default serialization
756+ * (e.g., if the class declares serializable fields that do not correspond
757+ * to actual fields, and hence must use the GetField API). This method
758+ * does not apply to deserialization of enum constants.
759+ */
760+ void checkDefaultSerialize() throws InvalidClassException {
761+ if (defaultSerializeEx != null) {
762+ InvalidClassException ice =
763+ new InvalidClassException(defaultSerializeEx.classname,
764+ defaultSerializeEx.getMessage());
765+ ice.initCause(defaultSerializeEx);
766+ throw ice;
767+ }
768+ }
769+
770+ /**
771+ * Returns superclass descriptor. Note that on the receiving side, the
772+ * superclass descriptor may be bound to a class that is not a superclass
773+ * of the subclass descriptor's bound class.
774+ */
775+ ObjectStreamClass getSuperDesc() {
776+ return superDesc;
777+ }
778+
779+ /**
780+ * Returns the "local" class descriptor for the class associated with this
781+ * class descriptor (i.e., the result of
782+ * ObjectStreamClass.lookup(this.forClass())) or null if there is no class
783+ * associated with this descriptor.
784+ */
785+ ObjectStreamClass getLocalDesc() {
786+ return localDesc;
787+ }
788+
789+ /**
790+ * Returns arrays of ObjectStreamFields representing the serializable
791+ * fields of the represented class. If copy is true, a clone of this class
792+ * descriptor's field array is returned, otherwise the array itself is
793+ * returned.
794+ */
795+ ObjectStreamField[] getFields(boolean copy) {
796+ return copy ? fields.clone() : fields;
797+ }
798+
799+ /**
800+ * Looks up a serializable field of the represented class by name and type.
801+ * A specified type of null matches all types, Object.class matches all
802+ * non-primitive types, and any other non-null type matches assignable
803+ * types only. Returns matching field, or null if no match found.
804+ */
805+ ObjectStreamField getField(String name, Class<?> type) {
806+ for (int i = 0; i < fields.length; i++) {
807+ ObjectStreamField f = fields[i];
808+ if (f.getName().equals(name)) {
809+ if (type == null ||
810+ (type == Object.class && !f.isPrimitive()))
811+ {
812+ return f;
813+ }
814+ Class<?> ftype = f.getType();
815+ if (ftype != null && type.isAssignableFrom(ftype)) {
816+ return f;
817+ }
818+ }
819+ }
820+ return null;
821+ }
822+
823+ /**
824+ * Returns true if class descriptor represents a dynamic proxy class, false
825+ * otherwise.
826+ */
827+ boolean isProxy() {
828+ return isProxy;
829+ }
830+
831+ /**
832+ * Returns true if class descriptor represents an enum type, false
833+ * otherwise.
834+ */
835+ boolean isEnum() {
836+ return isEnum;
837+ }
838+
839+ /**
840+ * Returns true if represented class implements Externalizable, false
841+ * otherwise.
842+ */
843+ boolean isExternalizable() {
844+ return externalizable;
845+ }
846+
847+ /**
848+ * Returns true if represented class implements Serializable, false
849+ * otherwise.
850+ */
851+ boolean isSerializable() {
852+ return serializable;
853+ }
854+
855+ /**
856+ * Returns true if class descriptor represents externalizable class that
857+ * has written its data in 1.2 (block data) format, false otherwise.
858+ */
859+ boolean hasBlockExternalData() {
860+ return hasBlockExternalData;
861+ }
862+
863+ /**
864+ * Returns true if class descriptor represents serializable (but not
865+ * externalizable) class which has written its data via a custom
866+ * writeObject() method, false otherwise.
867+ */
868+ boolean hasWriteObjectData() {
869+ return hasWriteObjectData;
870+ }
871+
872+ /**
873+ * Returns true if represented class is serializable/externalizable and can
874+ * be instantiated by the serialization runtime--i.e., if it is
875+ * externalizable and defines a public no-arg constructor, or if it is
876+ * non-externalizable and its first non-serializable superclass defines an
877+ * accessible no-arg constructor. Otherwise, returns false.
878+ */
879+ boolean isInstantiable() {
880+ return (cons != null);
881+ }
882+
883+ /**
884+ * Returns true if represented class is serializable (but not
885+ * externalizable) and defines a conformant writeObject method. Otherwise,
886+ * returns false.
887+ */
888+ boolean hasWriteObjectMethod() {
889+ return (writeObjectMethod != null);
890+ }
891+
892+ /**
893+ * Returns true if represented class is serializable (but not
894+ * externalizable) and defines a conformant readObject method. Otherwise,
895+ * returns false.
896+ */
897+ boolean hasReadObjectMethod() {
898+ return (readObjectMethod != null);
899+ }
900+
901+ /**
902+ * Returns true if represented class is serializable (but not
903+ * externalizable) and defines a conformant readObjectNoData method.
904+ * Otherwise, returns false.
905+ */
906+ boolean hasReadObjectNoDataMethod() {
907+ return (readObjectNoDataMethod != null);
908+ }
909+
910+ /**
911+ * Returns true if represented class is serializable or externalizable and
912+ * defines a conformant writeReplace method. Otherwise, returns false.
913+ */
914+ boolean hasWriteReplaceMethod() {
915+ return (writeReplaceMethod != null);
916+ }
917+
918+ /**
919+ * Returns true if represented class is serializable or externalizable and
920+ * defines a conformant readResolve method. Otherwise, returns false.
921+ */
922+ boolean hasReadResolveMethod() {
923+ return (readResolveMethod != null);
924+ }
925+
926+ /**
927+ * Creates a new instance of the represented class. If the class is
928+ * externalizable, invokes its public no-arg constructor; otherwise, if the
929+ * class is serializable, invokes the no-arg constructor of the first
930+ * non-serializable superclass. Throws UnsupportedOperationException if
931+ * this class descriptor is not associated with a class, if the associated
932+ * class is non-serializable or if the appropriate no-arg constructor is
933+ * inaccessible/unavailable.
934+ */
935+ Object newInstance()
936+ throws InstantiationException, InvocationTargetException,
937+ UnsupportedOperationException
938+ {
939+ if (cons != null) {
940+ try {
941+ return cons.newInstance();
942+ } catch (IllegalAccessException ex) {
943+ // should not occur, as access checks have been suppressed
944+ throw new InternalError();
945+ }
946+ } else {
947+ throw new UnsupportedOperationException();
948+ }
949+ }
950+
951+ /**
952+ * Invokes the writeObject method of the represented serializable class.
953+ * Throws UnsupportedOperationException if this class descriptor is not
954+ * associated with a class, or if the class is externalizable,
955+ * non-serializable or does not define writeObject.
956+ */
957+ void invokeWriteObject(Object obj, ObjectOutputStream out)
958+ throws IOException, UnsupportedOperationException
959+ {
960+ if (writeObjectMethod != null) {
961+ try {
962+ writeObjectMethod.invoke(obj, new Object[]{ out });
963+ } catch (InvocationTargetException ex) {
964+ Throwable th = ex.getTargetException();
965+ if (th instanceof IOException) {
966+ throw (IOException) th;
967+ } else {
968+ throwMiscException(th);
969+ }
970+ } catch (IllegalAccessException ex) {
971+ // should not occur, as access checks have been suppressed
972+ throw new InternalError();
973+ }
974+ } else {
975+ throw new UnsupportedOperationException();
976+ }
977+ }
978+
979+ /**
980+ * Invokes the readObject method of the represented serializable class.
981+ * Throws UnsupportedOperationException if this class descriptor is not
982+ * associated with a class, or if the class is externalizable,
983+ * non-serializable or does not define readObject.
984+ */
985+ void invokeReadObject(Object obj, ObjectInputStream in)
986+ throws ClassNotFoundException, IOException,
987+ UnsupportedOperationException
988+ {
989+ if (readObjectMethod != null) {
990+ try {
991+ readObjectMethod.invoke(obj, new Object[]{ in });
992+ } catch (InvocationTargetException ex) {
993+ Throwable th = ex.getTargetException();
994+ if (th instanceof ClassNotFoundException) {
995+ throw (ClassNotFoundException) th;
996+ } else if (th instanceof IOException) {
997+ throw (IOException) th;
998+ } else {
999+ throwMiscException(th);
1000+ }
1001+ } catch (IllegalAccessException ex) {
1002+ // should not occur, as access checks have been suppressed
1003+ throw new InternalError();
1004+ }
1005+ } else {
1006+ throw new UnsupportedOperationException();
1007+ }
1008+ }
1009+
1010+ /**
1011+ * Invokes the readObjectNoData method of the represented serializable
1012+ * class. Throws UnsupportedOperationException if this class descriptor is
1013+ * not associated with a class, or if the class is externalizable,
1014+ * non-serializable or does not define readObjectNoData.
1015+ */
1016+ void invokeReadObjectNoData(Object obj)
1017+ throws IOException, UnsupportedOperationException
1018+ {
1019+ if (readObjectNoDataMethod != null) {
1020+ try {
1021+ readObjectNoDataMethod.invoke(obj, (Object[]) null);
1022+ } catch (InvocationTargetException ex) {
1023+ Throwable th = ex.getTargetException();
1024+ if (th instanceof ObjectStreamException) {
1025+ throw (ObjectStreamException) th;
1026+ } else {
1027+ throwMiscException(th);
1028+ }
1029+ } catch (IllegalAccessException ex) {
1030+ // should not occur, as access checks have been suppressed
1031+ throw new InternalError();
1032+ }
1033+ } else {
1034+ throw new UnsupportedOperationException();
1035+ }
1036+ }
1037+
1038+ /**
1039+ * Invokes the writeReplace method of the represented serializable class and
1040+ * returns the result. Throws UnsupportedOperationException if this class
1041+ * descriptor is not associated with a class, or if the class is
1042+ * non-serializable or does not define writeReplace.
1043+ */
1044+ Object invokeWriteReplace(Object obj)
1045+ throws IOException, UnsupportedOperationException
1046+ {
1047+ if (writeReplaceMethod != null) {
1048+ try {
1049+ return writeReplaceMethod.invoke(obj, (Object[]) null);
1050+ } catch (InvocationTargetException ex) {
1051+ Throwable th = ex.getTargetException();
1052+ if (th instanceof ObjectStreamException) {
1053+ throw (ObjectStreamException) th;
1054+ } else {
1055+ throwMiscException(th);
1056+ throw new InternalError(); // never reached
1057+ }
1058+ } catch (IllegalAccessException ex) {
1059+ // should not occur, as access checks have been suppressed
1060+ throw new InternalError();
1061+ }
1062+ } else {
1063+ throw new UnsupportedOperationException();
1064+ }
1065+ }
1066+
1067+ /**
1068+ * Invokes the readResolve method of the represented serializable class and
1069+ * returns the result. Throws UnsupportedOperationException if this class
1070+ * descriptor is not associated with a class, or if the class is
1071+ * non-serializable or does not define readResolve.
1072+ */
1073+ Object invokeReadResolve(Object obj)
1074+ throws IOException, UnsupportedOperationException
1075+ {
1076+ if (readResolveMethod != null) {
1077+ try {
1078+ return readResolveMethod.invoke(obj, (Object[]) null);
1079+ } catch (InvocationTargetException ex) {
1080+ Throwable th = ex.getTargetException();
1081+ if (th instanceof ObjectStreamException) {
1082+ throw (ObjectStreamException) th;
1083+ } else {
1084+ throwMiscException(th);
1085+ throw new InternalError(); // never reached
1086+ }
1087+ } catch (IllegalAccessException ex) {
1088+ // should not occur, as access checks have been suppressed
1089+ throw new InternalError();
1090+ }
1091+ } else {
1092+ throw new UnsupportedOperationException();
1093+ }
1094+ }
1095+
1096+ /**
1097+ * Class representing the portion of an object's serialized form allotted
1098+ * to data described by a given class descriptor. If "hasData" is false,
1099+ * the object's serialized form does not contain data associated with the
1100+ * class descriptor.
1101+ */
1102+ static class ClassDataSlot {
1103+
1104+ /** class descriptor "occupying" this slot */
1105+ final ObjectStreamClass desc;
1106+ /** true if serialized form includes data for this slot's descriptor */
1107+ final boolean hasData;
1108+
1109+ ClassDataSlot(ObjectStreamClass desc, boolean hasData) {
1110+ this.desc = desc;
1111+ this.hasData = hasData;
1112+ }
1113+ }
1114+
1115+ /**
1116+ * Returns array of ClassDataSlot instances representing the data layout
1117+ * (including superclass data) for serialized objects described by this
1118+ * class descriptor. ClassDataSlots are ordered by inheritance with those
1119+ * containing "higher" superclasses appearing first. The final
1120+ * ClassDataSlot contains a reference to this descriptor.
1121+ */
1122+ ClassDataSlot[] getClassDataLayout() throws InvalidClassException {
1123+ // REMIND: synchronize instead of relying on volatile?
1124+ if (dataLayout == null) {
1125+ dataLayout = getClassDataLayout0();
1126+ }
1127+ return dataLayout;
1128+ }
1129+
1130+ private ClassDataSlot[] getClassDataLayout0()
1131+ throws InvalidClassException
1132+ {
1133+ ArrayList<ClassDataSlot> slots = new ArrayList<>();
1134+ Class<?> start = cl, end = cl;
1135+
1136+ // locate closest non-serializable superclass
1137+ while (end != null && Serializable.class.isAssignableFrom(end)) {
1138+ end = end.getSuperclass();
1139+ }
1140+
1141+ for (ObjectStreamClass d = this; d != null; d = d.superDesc) {
1142+
1143+ // search up inheritance hierarchy for class with matching name
1144+ String searchName = (d.cl != null) ? d.cl.getName() : d.name;
1145+ Class<?> match = null;
1146+ for (Class<?> c = start; c != end; c = c.getSuperclass()) {
1147+ if (searchName.equals(c.getName())) {
1148+ match = c;
1149+ break;
1150+ }
1151+ }
1152+
1153+ // add "no data" slot for each unmatched class below match
1154+ if (match != null) {
1155+ for (Class<?> c = start; c != match; c = c.getSuperclass()) {
1156+ slots.add(new ClassDataSlot(
1157+ ObjectStreamClass.lookup(c, true), false));
1158+ }
1159+ start = match.getSuperclass();
1160+ }
1161+
1162+ // record descriptor/class pairing
1163+ slots.add(new ClassDataSlot(d.getVariantFor(match), true));
1164+ }
1165+
1166+ // add "no data" slot for any leftover unmatched classes
1167+ for (Class<?> c = start; c != end; c = c.getSuperclass()) {
1168+ slots.add(new ClassDataSlot(
1169+ ObjectStreamClass.lookup(c, true), false));
1170+ }
1171+
1172+ // order slots from superclass -> subclass
1173+ Collections.reverse(slots);
1174+ return slots.toArray(new ClassDataSlot[slots.size()]);
1175+ }
1176+
1177+ /**
1178+ * Returns aggregate size (in bytes) of marshalled primitive field values
1179+ * for represented class.
1180+ */
1181+ int getPrimDataSize() {
1182+ return primDataSize;
1183+ }
1184+
1185+ /**
1186+ * Returns number of non-primitive serializable fields of represented
1187+ * class.
1188+ */
1189+ int getNumObjFields() {
1190+ return numObjFields;
1191+ }
1192+
1193+ /**
1194+ * Fetches the serializable primitive field values of object obj and
1195+ * marshals them into byte array buf starting at offset 0. It is the
1196+ * responsibility of the caller to ensure that obj is of the proper type if
1197+ * non-null.
1198+ */
1199+ void getPrimFieldValues(Object obj, byte[] buf) {
1200+ fieldRefl.getPrimFieldValues(obj, buf);
1201+ }
1202+
1203+ /**
1204+ * Sets the serializable primitive fields of object obj using values
1205+ * unmarshalled from byte array buf starting at offset 0. It is the
1206+ * responsibility of the caller to ensure that obj is of the proper type if
1207+ * non-null.
1208+ */
1209+ void setPrimFieldValues(Object obj, byte[] buf) {
1210+ fieldRefl.setPrimFieldValues(obj, buf);
1211+ }
1212+
1213+ /**
1214+ * Fetches the serializable object field values of object obj and stores
1215+ * them in array vals starting at offset 0. It is the responsibility of
1216+ * the caller to ensure that obj is of the proper type if non-null.
1217+ */
1218+ void getObjFieldValues(Object obj, Object[] vals) {
1219+ fieldRefl.getObjFieldValues(obj, vals);
1220+ }
1221+
1222+ /**
1223+ * Sets the serializable object fields of object obj using values from
1224+ * array vals starting at offset 0. It is the responsibility of the caller
1225+ * to ensure that obj is of the proper type if non-null.
1226+ */
1227+ void setObjFieldValues(Object obj, Object[] vals) {
1228+ fieldRefl.setObjFieldValues(obj, vals);
1229+ }
1230+
1231+ /**
1232+ * Calculates and sets serializable field offsets, as well as primitive
1233+ * data size and object field count totals. Throws InvalidClassException
1234+ * if fields are illegally ordered.
1235+ */
1236+ private void computeFieldOffsets() throws InvalidClassException {
1237+ primDataSize = 0;
1238+ numObjFields = 0;
1239+ int firstObjIndex = -1;
1240+
1241+ for (int i = 0; i < fields.length; i++) {
1242+ ObjectStreamField f = fields[i];
1243+ switch (f.getTypeCode()) {
1244+ case 'Z':
1245+ case 'B':
1246+ f.setOffset(primDataSize++);
1247+ break;
1248+
1249+ case 'C':
1250+ case 'S':
1251+ f.setOffset(primDataSize);
1252+ primDataSize += 2;
1253+ break;
1254+
1255+ case 'I':
1256+ case 'F':
1257+ f.setOffset(primDataSize);
1258+ primDataSize += 4;
1259+ break;
1260+
1261+ case 'J':
1262+ case 'D':
1263+ f.setOffset(primDataSize);
1264+ primDataSize += 8;
1265+ break;
1266+
1267+ case '[':
1268+ case 'L':
1269+ f.setOffset(numObjFields++);
1270+ if (firstObjIndex == -1) {
1271+ firstObjIndex = i;
1272+ }
1273+ break;
1274+
1275+ default:
1276+ throw new InternalError();
1277+ }
1278+ }
1279+ if (firstObjIndex != -1 &&
1280+ firstObjIndex + numObjFields != fields.length)
1281+ {
1282+ throw new InvalidClassException(name, "illegal field order");
1283+ }
1284+ }
1285+
1286+ /**
1287+ * If given class is the same as the class associated with this class
1288+ * descriptor, returns reference to this class descriptor. Otherwise,
1289+ * returns variant of this class descriptor bound to given class.
1290+ */
1291+ private ObjectStreamClass getVariantFor(Class<?> cl)
1292+ throws InvalidClassException
1293+ {
1294+ if (this.cl == cl) {
1295+ return this;
1296+ }
1297+ ObjectStreamClass desc = new ObjectStreamClass();
1298+ if (isProxy) {
1299+ desc.initProxy(cl, null, superDesc);
1300+ } else {
1301+ desc.initNonProxy(this, cl, null, superDesc);
1302+ }
1303+ return desc;
1304+ }
1305+
1306+ /**
1307+ * Returns public no-arg constructor of given class, or null if none found.
1308+ * Access checks are disabled on the returned constructor (if any), since
1309+ * the defining class may still be non-public.
1310+ */
1311+ private static Constructor getExternalizableConstructor(Class<?> cl) {
1312+ try {
1313+ Constructor cons = cl.getDeclaredConstructor((Class<?>[]) null);
1314+ cons.setAccessible(true);
1315+ return ((cons.getModifiers() & Modifier.PUBLIC) != 0) ?
1316+ cons : null;
1317+ } catch (NoSuchMethodException ex) {
1318+ return null;
1319+ }
1320+ }
1321+
1322+ /**
1323+ * Returns subclass-accessible no-arg constructor of first non-serializable
1324+ * superclass, or null if none found. Access checks are disabled on the
1325+ * returned constructor (if any).
1326+ */
1327+ private static Constructor getSerializableConstructor(Class<?> cl) {
1328+ Class<?> initCl = cl;
1329+ while (Serializable.class.isAssignableFrom(initCl)) {
1330+ if ((initCl = initCl.getSuperclass()) == null) {
1331+ return null;
1332+ }
1333+ }
1334+ try {
1335+ Constructor cons = initCl.getDeclaredConstructor((Class<?>[]) null);
1336+ int mods = cons.getModifiers();
1337+ if ((mods & Modifier.PRIVATE) != 0 ||
1338+ ((mods & (Modifier.PUBLIC | Modifier.PROTECTED)) == 0 &&
1339+ !packageEquals(cl, initCl)))
1340+ {
1341+ return null;
1342+ }
1343+ cons = reflFactory.newConstructorForSerialization(cl, cons);
1344+ cons.setAccessible(true);
1345+ return cons;
1346+ } catch (NoSuchMethodException ex) {
1347+ return null;
1348+ }
1349+ }
1350+
1351+ /**
1352+ * Returns non-static, non-abstract method with given signature provided it
1353+ * is defined by or accessible (via inheritance) by the given class, or
1354+ * null if no match found. Access checks are disabled on the returned
1355+ * method (if any).
1356+ */
1357+ private static Method getInheritableMethod(Class<?> cl, String name,
1358+ Class<?>[] argTypes,
1359+ Class<?> returnType)
1360+ {
1361+ Method meth = null;
1362+ Class<?> defCl = cl;
1363+ while (defCl != null) {
1364+ try {
1365+ meth = defCl.getDeclaredMethod(name, argTypes);
1366+ break;
1367+ } catch (NoSuchMethodException ex) {
1368+ defCl = defCl.getSuperclass();
1369+ }
1370+ }
1371+
1372+ if ((meth == null) || (meth.getReturnType() != returnType)) {
1373+ return null;
1374+ }
1375+ meth.setAccessible(true);
1376+ int mods = meth.getModifiers();
1377+ if ((mods & (Modifier.STATIC | Modifier.ABSTRACT)) != 0) {
1378+ return null;
1379+ } else if ((mods & (Modifier.PUBLIC | Modifier.PROTECTED)) != 0) {
1380+ return meth;
1381+ } else if ((mods & Modifier.PRIVATE) != 0) {
1382+ return (cl == defCl) ? meth : null;
1383+ } else {
1384+ return packageEquals(cl, defCl) ? meth : null;
1385+ }
1386+ }
1387+
1388+ /**
1389+ * Returns non-static private method with given signature defined by given
1390+ * class, or null if none found. Access checks are disabled on the
1391+ * returned method (if any).
1392+ */
1393+ private static Method getPrivateMethod(Class<?> cl, String name,
1394+ Class<?>[] argTypes,
1395+ Class<?> returnType)
1396+ {
1397+ try {
1398+ Method meth = cl.getDeclaredMethod(name, argTypes);
1399+ meth.setAccessible(true);
1400+ int mods = meth.getModifiers();
1401+ return ((meth.getReturnType() == returnType) &&
1402+ ((mods & Modifier.STATIC) == 0) &&
1403+ ((mods & Modifier.PRIVATE) != 0)) ? meth : null;
1404+ } catch (NoSuchMethodException ex) {
1405+ return null;
1406+ }
1407+ }
1408+
1409+ /**
1410+ * Returns true if classes are defined in the same runtime package, false
1411+ * otherwise.
1412+ */
1413+ private static boolean packageEquals(Class<?> cl1, Class<?> cl2) {
1414+ return (cl1.getClassLoader() == cl2.getClassLoader() &&
1415+ getPackageName(cl1).equals(getPackageName(cl2)));
1416+ }
1417+
1418+ /**
1419+ * Returns package name of given class.
1420+ */
1421+ private static String getPackageName(Class<?> cl) {
1422+ String s = cl.getName();
1423+ int i = s.lastIndexOf('[');
1424+ if (i >= 0) {
1425+ s = s.substring(i + 2);
1426+ }
1427+ i = s.lastIndexOf('.');
1428+ return (i >= 0) ? s.substring(0, i) : "";
1429+ }
1430+
1431+ /**
1432+ * Compares class names for equality, ignoring package names. Returns true
1433+ * if class names equal, false otherwise.
1434+ */
1435+ private static boolean classNamesEqual(String name1, String name2) {
1436+ name1 = name1.substring(name1.lastIndexOf('.') + 1);
1437+ name2 = name2.substring(name2.lastIndexOf('.') + 1);
1438+ return name1.equals(name2);
1439+ }
1440+
1441+ /**
1442+ * Returns JVM type signature for given class.
1443+ */
1444+ private static String getClassSignature(Class<?> cl) {
1445+ StringBuilder sbuf = new StringBuilder();
1446+ while (cl.isArray()) {
1447+ sbuf.append('[');
1448+ cl = cl.getComponentType();
1449+ }
1450+ if (cl.isPrimitive()) {
1451+ if (cl == Integer.TYPE) {
1452+ sbuf.append('I');
1453+ } else if (cl == Byte.TYPE) {
1454+ sbuf.append('B');
1455+ } else if (cl == Long.TYPE) {
1456+ sbuf.append('J');
1457+ } else if (cl == Float.TYPE) {
1458+ sbuf.append('F');
1459+ } else if (cl == Double.TYPE) {
1460+ sbuf.append('D');
1461+ } else if (cl == Short.TYPE) {
1462+ sbuf.append('S');
1463+ } else if (cl == Character.TYPE) {
1464+ sbuf.append('C');
1465+ } else if (cl == Boolean.TYPE) {
1466+ sbuf.append('Z');
1467+ } else if (cl == Void.TYPE) {
1468+ sbuf.append('V');
1469+ } else {
1470+ throw new InternalError();
1471+ }
1472+ } else {
1473+ sbuf.append('L' + cl.getName().replace('.', '/') + ';');
1474+ }
1475+ return sbuf.toString();
1476+ }
1477+
1478+ /**
1479+ * Returns JVM type signature for given list of parameters and return type.
1480+ */
1481+ private static String getMethodSignature(Class<?>[] paramTypes,
1482+ Class<?> retType)
1483+ {
1484+ StringBuilder sbuf = new StringBuilder();
1485+ sbuf.append('(');
1486+ for (int i = 0; i < paramTypes.length; i++) {
1487+ sbuf.append(getClassSignature(paramTypes[i]));
1488+ }
1489+ sbuf.append(')');
1490+ sbuf.append(getClassSignature(retType));
1491+ return sbuf.toString();
1492+ }
1493+
1494+ /**
1495+ * Convenience method for throwing an exception that is either a
1496+ * RuntimeException, Error, or of some unexpected type (in which case it is
1497+ * wrapped inside an IOException).
1498+ */
1499+ private static void throwMiscException(Throwable th) throws IOException {
1500+ if (th instanceof RuntimeException) {
1501+ throw (RuntimeException) th;
1502+ } else if (th instanceof Error) {
1503+ throw (Error) th;
1504+ } else {
1505+ IOException ex = new IOException("unexpected exception type");
1506+ ex.initCause(th);
1507+ throw ex;
1508+ }
1509+ }
1510+
1511+ /**
1512+ * Returns ObjectStreamField array describing the serializable fields of
1513+ * the given class. Serializable fields backed by an actual field of the
1514+ * class are represented by ObjectStreamFields with corresponding non-null
1515+ * Field objects. Throws InvalidClassException if the (explicitly
1516+ * declared) serializable fields are invalid.
1517+ */
1518+ private static ObjectStreamField[] getSerialFields(Class<?> cl)
1519+ throws InvalidClassException
1520+ {
1521+ ObjectStreamField[] fields;
1522+ if (Serializable.class.isAssignableFrom(cl) &&
1523+ !Externalizable.class.isAssignableFrom(cl) &&
1524+ !Proxy.isProxyClass(cl) &&
1525+ !cl.isInterface())
1526+ {
1527+ if ((fields = getDeclaredSerialFields(cl)) == null) {
1528+ fields = getDefaultSerialFields(cl);
1529+ }
1530+ Arrays.sort(fields);
1531+ } else {
1532+ fields = NO_FIELDS;
1533+ }
1534+ return fields;
1535+ }
1536+
1537+ /**
1538+ * Returns serializable fields of given class as defined explicitly by a
1539+ * "serialPersistentFields" field, or null if no appropriate
1540+ * "serialPersistentFields" field is defined. Serializable fields backed
1541+ * by an actual field of the class are represented by ObjectStreamFields
1542+ * with corresponding non-null Field objects. For compatibility with past
1543+ * releases, a "serialPersistentFields" field with a null value is
1544+ * considered equivalent to not declaring "serialPersistentFields". Throws
1545+ * InvalidClassException if the declared serializable fields are
1546+ * invalid--e.g., if multiple fields share the same name.
1547+ */
1548+ private static ObjectStreamField[] getDeclaredSerialFields(Class<?> cl)
1549+ throws InvalidClassException
1550+ {
1551+ ObjectStreamField[] serialPersistentFields = null;
1552+ try {
1553+ Field f = cl.getDeclaredField("serialPersistentFields");
1554+ int mask = Modifier.PRIVATE | Modifier.STATIC | Modifier.FINAL;
1555+ if ((f.getModifiers() & mask) == mask) {
1556+ f.setAccessible(true);
1557+ serialPersistentFields = (ObjectStreamField[]) f.get(null);
1558+ }
1559+ } catch (Exception ex) {
1560+ }
1561+ if (serialPersistentFields == null) {
1562+ return null;
1563+ } else if (serialPersistentFields.length == 0) {
1564+ return NO_FIELDS;
1565+ }
1566+
1567+ ObjectStreamField[] boundFields =
1568+ new ObjectStreamField[serialPersistentFields.length];
1569+ Set<String> fieldNames = new HashSet<>(serialPersistentFields.length);
1570+
1571+ for (int i = 0; i < serialPersistentFields.length; i++) {
1572+ ObjectStreamField spf = serialPersistentFields[i];
1573+
1574+ String fname = spf.getName();
1575+ if (fieldNames.contains(fname)) {
1576+ throw new InvalidClassException(
1577+ "multiple serializable fields named " + fname);
1578+ }
1579+ fieldNames.add(fname);
1580+
1581+ try {
1582+ Field f = cl.getDeclaredField(fname);
1583+ if ((f.getType() == spf.getType()) &&
1584+ ((f.getModifiers() & Modifier.STATIC) == 0))
1585+ {
1586+ boundFields[i] =
1587+ new ObjectStreamField(f, spf.isUnshared(), true);
1588+ }
1589+ } catch (NoSuchFieldException ex) {
1590+ }
1591+ if (boundFields[i] == null) {
1592+ boundFields[i] = new ObjectStreamField(
1593+ fname, spf.getType(), spf.isUnshared());
1594+ }
1595+ }
1596+ return boundFields;
1597+ }
1598+
1599+ /**
1600+ * Returns array of ObjectStreamFields corresponding to all non-static
1601+ * non-transient fields declared by given class. Each ObjectStreamField
1602+ * contains a Field object for the field it represents. If no default
1603+ * serializable fields exist, NO_FIELDS is returned.
1604+ */
1605+ private static ObjectStreamField[] getDefaultSerialFields(Class<?> cl) {
1606+ Field[] clFields = cl.getDeclaredFields();
1607+ ArrayList<ObjectStreamField> list = new ArrayList<>();
1608+ int mask = Modifier.STATIC | Modifier.TRANSIENT;
1609+
1610+ for (int i = 0; i < clFields.length; i++) {
1611+ if ((clFields[i].getModifiers() & mask) == 0) {
1612+ list.add(new ObjectStreamField(clFields[i], false, true));
1613+ }
1614+ }
1615+ int size = list.size();
1616+ return (size == 0) ? NO_FIELDS :
1617+ list.toArray(new ObjectStreamField[size]);
1618+ }
1619+
1620+ /**
1621+ * Returns explicit serial version UID value declared by given class, or
1622+ * null if none.
1623+ */
1624+ private static Long getDeclaredSUID(Class<?> cl) {
1625+ try {
1626+ Field f = cl.getDeclaredField("serialVersionUID");
1627+ int mask = Modifier.STATIC | Modifier.FINAL;
1628+ if ((f.getModifiers() & mask) == mask) {
1629+ f.setAccessible(true);
1630+ return Long.valueOf(f.getLong(null));
1631+ }
1632+ } catch (Exception ex) {
1633+ }
1634+ return null;
1635+ }
1636+
1637+ /**
1638+ * Computes the default serial version UID value for the given class.
1639+ */
1640+ private static long computeDefaultSUID(Class<?> cl) {
1641+ if (!Serializable.class.isAssignableFrom(cl) || Proxy.isProxyClass(cl))
1642+ {
1643+ return 0L;
1644+ }
1645+
1646+ try {
1647+ ByteArrayOutputStream bout = new ByteArrayOutputStream();
1648+ DataOutputStream dout = new DataOutputStream(bout);
1649+
1650+ dout.writeUTF(cl.getName());
1651+
1652+ int classMods = cl.getModifiers() &
1653+ (Modifier.PUBLIC | Modifier.FINAL |
1654+ Modifier.INTERFACE | Modifier.ABSTRACT);
1655+
1656+ /*
1657+ * compensate for javac bug in which ABSTRACT bit was set for an
1658+ * interface only if the interface declared methods
1659+ */
1660+ Method[] methods = cl.getDeclaredMethods();
1661+ if ((classMods & Modifier.INTERFACE) != 0) {
1662+ classMods = (methods.length > 0) ?
1663+ (classMods | Modifier.ABSTRACT) :
1664+ (classMods & ~Modifier.ABSTRACT);
1665+ }
1666+ dout.writeInt(classMods);
1667+
1668+ if (!cl.isArray()) {
1669+ /*
1670+ * compensate for change in 1.2FCS in which
1671+ * Class.getInterfaces() was modified to return Cloneable and
1672+ * Serializable for array classes.
1673+ */
1674+ Class<?>[] interfaces = cl.getInterfaces();
1675+ String[] ifaceNames = new String[interfaces.length];
1676+ for (int i = 0; i < interfaces.length; i++) {
1677+ ifaceNames[i] = interfaces[i].getName();
1678+ }
1679+ Arrays.sort(ifaceNames);
1680+ for (int i = 0; i < ifaceNames.length; i++) {
1681+ dout.writeUTF(ifaceNames[i]);
1682+ }
1683+ }
1684+
1685+ Field[] fields = cl.getDeclaredFields();
1686+ MemberSignature[] fieldSigs = new MemberSignature[fields.length];
1687+ for (int i = 0; i < fields.length; i++) {
1688+ fieldSigs[i] = new MemberSignature(fields[i]);
1689+ }
1690+ Arrays.sort(fieldSigs, new Comparator<MemberSignature>() {
1691+ public int compare(MemberSignature ms1, MemberSignature ms2) {
1692+ return ms1.name.compareTo(ms2.name);
1693+ }
1694+ });
1695+ for (int i = 0; i < fieldSigs.length; i++) {
1696+ MemberSignature sig = fieldSigs[i];
1697+ int mods = sig.member.getModifiers() &
1698+ (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
1699+ Modifier.STATIC | Modifier.FINAL | Modifier.VOLATILE |
1700+ Modifier.TRANSIENT);
1701+ if (((mods & Modifier.PRIVATE) == 0) ||
1702+ ((mods & (Modifier.STATIC | Modifier.TRANSIENT)) == 0))
1703+ {
1704+ dout.writeUTF(sig.name);
1705+ dout.writeInt(mods);
1706+ dout.writeUTF(sig.signature);
1707+ }
1708+ }
1709+
1710+ if (hasStaticInitializer(cl)) {
1711+ dout.writeUTF("<clinit>");
1712+ dout.writeInt(Modifier.STATIC);
1713+ dout.writeUTF("()V");
1714+ }
1715+
1716+ Constructor[] cons = cl.getDeclaredConstructors();
1717+ MemberSignature[] consSigs = new MemberSignature[cons.length];
1718+ for (int i = 0; i < cons.length; i++) {
1719+ consSigs[i] = new MemberSignature(cons[i]);
1720+ }
1721+ Arrays.sort(consSigs, new Comparator<MemberSignature>() {
1722+ public int compare(MemberSignature ms1, MemberSignature ms2) {
1723+ return ms1.signature.compareTo(ms2.signature);
1724+ }
1725+ });
1726+ for (int i = 0; i < consSigs.length; i++) {
1727+ MemberSignature sig = consSigs[i];
1728+ int mods = sig.member.getModifiers() &
1729+ (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
1730+ Modifier.STATIC | Modifier.FINAL |
1731+ Modifier.SYNCHRONIZED | Modifier.NATIVE |
1732+ Modifier.ABSTRACT | Modifier.STRICT);
1733+ if ((mods & Modifier.PRIVATE) == 0) {
1734+ dout.writeUTF("<init>");
1735+ dout.writeInt(mods);
1736+ dout.writeUTF(sig.signature.replace('/', '.'));
1737+ }
1738+ }
1739+
1740+ MemberSignature[] methSigs = new MemberSignature[methods.length];
1741+ for (int i = 0; i < methods.length; i++) {
1742+ methSigs[i] = new MemberSignature(methods[i]);
1743+ }
1744+ Arrays.sort(methSigs, new Comparator<MemberSignature>() {
1745+ public int compare(MemberSignature ms1, MemberSignature ms2) {
1746+ int comp = ms1.name.compareTo(ms2.name);
1747+ if (comp == 0) {
1748+ comp = ms1.signature.compareTo(ms2.signature);
1749+ }
1750+ return comp;
1751+ }
1752+ });
1753+ for (int i = 0; i < methSigs.length; i++) {
1754+ MemberSignature sig = methSigs[i];
1755+ int mods = sig.member.getModifiers() &
1756+ (Modifier.PUBLIC | Modifier.PRIVATE | Modifier.PROTECTED |
1757+ Modifier.STATIC | Modifier.FINAL |
1758+ Modifier.SYNCHRONIZED | Modifier.NATIVE |
1759+ Modifier.ABSTRACT | Modifier.STRICT);
1760+ if ((mods & Modifier.PRIVATE) == 0) {
1761+ dout.writeUTF(sig.name);
1762+ dout.writeInt(mods);
1763+ dout.writeUTF(sig.signature.replace('/', '.'));
1764+ }
1765+ }
1766+
1767+ dout.flush();
1768+
1769+ MessageDigest md = MessageDigest.getInstance("SHA");
1770+ byte[] hashBytes = md.digest(bout.toByteArray());
1771+ long hash = 0;
1772+ for (int i = Math.min(hashBytes.length, 8) - 1; i >= 0; i--) {
1773+ hash = (hash << 8) | (hashBytes[i] & 0xFF);
1774+ }
1775+ return hash;
1776+ } catch (IOException ex) {
1777+ throw new InternalError();
1778+ } catch (NoSuchAlgorithmException ex) {
1779+ throw new SecurityException(ex.getMessage());
1780+ }
1781+ }
1782+
1783+ /**
1784+ * Returns true if the given class defines a static initializer method,
1785+ * false otherwise.
1786+ */
1787+ private native static boolean hasStaticInitializer(Class<?> cl);
1788+
1789+ /**
1790+ * Class for computing and caching field/constructor/method signatures
1791+ * during serialVersionUID calculation.
1792+ */
1793+ private static class MemberSignature {
1794+
1795+ public final Member member;
1796+ public final String name;
1797+ public final String signature;
1798+
1799+ public MemberSignature(Field field) {
1800+ member = field;
1801+ name = field.getName();
1802+ signature = getClassSignature(field.getType());
1803+ }
1804+
1805+ public MemberSignature(Constructor cons) {
1806+ member = cons;
1807+ name = cons.getName();
1808+ signature = getMethodSignature(
1809+ cons.getParameterTypes(), Void.TYPE);
1810+ }
1811+
1812+ public MemberSignature(Method meth) {
1813+ member = meth;
1814+ name = meth.getName();
1815+ signature = getMethodSignature(
1816+ meth.getParameterTypes(), meth.getReturnType());
1817+ }
1818+ }
1819+
1820+ /**
1821+ * Class for setting and retrieving serializable field values in batch.
1822+ */
1823+ // REMIND: dynamically generate these?
1824+ private static class FieldReflector {
1825+
1826+ /** handle for performing unsafe operations */
1827+ private static final Unsafe unsafe = Unsafe.getUnsafe();
1828+
1829+ /** fields to operate on */
1830+ private final ObjectStreamField[] fields;
1831+ /** number of primitive fields */
1832+ private final int numPrimFields;
1833+ /** unsafe field keys for reading fields - may contain dupes */
1834+ private final long[] readKeys;
1835+ /** unsafe fields keys for writing fields - no dupes */
1836+ private final long[] writeKeys;
1837+ /** field data offsets */
1838+ private final int[] offsets;
1839+ /** field type codes */
1840+ private final char[] typeCodes;
1841+ /** field types */
1842+ private final Class<?>[] types;
1843+
1844+ /**
1845+ * Constructs FieldReflector capable of setting/getting values from the
1846+ * subset of fields whose ObjectStreamFields contain non-null
1847+ * reflective Field objects. ObjectStreamFields with null Fields are
1848+ * treated as filler, for which get operations return default values
1849+ * and set operations discard given values.
1850+ */
1851+ FieldReflector(ObjectStreamField[] fields) {
1852+ this.fields = fields;
1853+ int nfields = fields.length;
1854+ readKeys = new long[nfields];
1855+ writeKeys = new long[nfields];
1856+ offsets = new int[nfields];
1857+ typeCodes = new char[nfields];
1858+ ArrayList<Class<?>> typeList = new ArrayList<>();
1859+ Set<Long> usedKeys = new HashSet<>();
1860+
1861+
1862+ for (int i = 0; i < nfields; i++) {
1863+ ObjectStreamField f = fields[i];
1864+ Field rf = f.getField();
1865+ long key = (rf != null) ?
1866+ unsafe.objectFieldOffset(rf) : Unsafe.INVALID_FIELD_OFFSET;
1867+ readKeys[i] = key;
1868+ writeKeys[i] = usedKeys.add(key) ?
1869+ key : Unsafe.INVALID_FIELD_OFFSET;
1870+ offsets[i] = f.getOffset();
1871+ typeCodes[i] = f.getTypeCode();
1872+ if (!f.isPrimitive()) {
1873+ typeList.add((rf != null) ? rf.getType() : null);
1874+ }
1875+ }
1876+
1877+ types = typeList.toArray(new Class<?>[typeList.size()]);
1878+ numPrimFields = nfields - types.length;
1879+ }
1880+
1881+ /**
1882+ * Returns list of ObjectStreamFields representing fields operated on
1883+ * by this reflector. The shared/unshared values and Field objects
1884+ * contained by ObjectStreamFields in the list reflect their bindings
1885+ * to locally defined serializable fields.
1886+ */
1887+ ObjectStreamField[] getFields() {
1888+ return fields;
1889+ }
1890+
1891+ /**
1892+ * Fetches the serializable primitive field values of object obj and
1893+ * marshals them into byte array buf starting at offset 0. The caller
1894+ * is responsible for ensuring that obj is of the proper type.
1895+ */
1896+ void getPrimFieldValues(Object obj, byte[] buf) {
1897+ if (obj == null) {
1898+ throw new NullPointerException();
1899+ }
1900+ /* assuming checkDefaultSerialize() has been called on the class
1901+ * descriptor this FieldReflector was obtained from, no field keys
1902+ * in array should be equal to Unsafe.INVALID_FIELD_OFFSET.
1903+ */
1904+ for (int i = 0; i < numPrimFields; i++) {
1905+ long key = readKeys[i];
1906+ int off = offsets[i];
1907+ switch (typeCodes[i]) {
1908+ case 'Z':
1909+ Bits.putBoolean(buf, off, unsafe.getBoolean(obj, key));
1910+ break;
1911+
1912+ case 'B':
1913+ buf[off] = unsafe.getByte(obj, key);
1914+ break;
1915+
1916+ case 'C':
1917+ Bits.putChar(buf, off, unsafe.getChar(obj, key));
1918+ break;
1919+
1920+ case 'S':
1921+ Bits.putShort(buf, off, unsafe.getShort(obj, key));
1922+ break;
1923+
1924+ case 'I':
1925+ Bits.putInt(buf, off, unsafe.getInt(obj, key));
1926+ break;
1927+
1928+ case 'F':
1929+ Bits.putFloat(buf, off, unsafe.getFloat(obj, key));
1930+ break;
1931+
1932+ case 'J':
1933+ Bits.putLong(buf, off, unsafe.getLong(obj, key));
1934+ break;
1935+
1936+ case 'D':
1937+ Bits.putDouble(buf, off, unsafe.getDouble(obj, key));
1938+ break;
1939+
1940+ default:
1941+ throw new InternalError();
1942+ }
1943+ }
1944+ }
1945+
1946+ /**
1947+ * Sets the serializable primitive fields of object obj using values
1948+ * unmarshalled from byte array buf starting at offset 0. The caller
1949+ * is responsible for ensuring that obj is of the proper type.
1950+ */
1951+ void setPrimFieldValues(Object obj, byte[] buf) {
1952+ if (obj == null) {
1953+ throw new NullPointerException();
1954+ }
1955+ for (int i = 0; i < numPrimFields; i++) {
1956+ long key = writeKeys[i];
1957+ if (key == Unsafe.INVALID_FIELD_OFFSET) {
1958+ continue; // discard value
1959+ }
1960+ int off = offsets[i];
1961+ switch (typeCodes[i]) {
1962+ case 'Z':
1963+ unsafe.putBoolean(obj, key, Bits.getBoolean(buf, off));
1964+ break;
1965+
1966+ case 'B':
1967+ unsafe.putByte(obj, key, buf[off]);
1968+ break;
1969+
1970+ case 'C':
1971+ unsafe.putChar(obj, key, Bits.getChar(buf, off));
1972+ break;
1973+
1974+ case 'S':
1975+ unsafe.putShort(obj, key, Bits.getShort(buf, off));
1976+ break;
1977+
1978+ case 'I':
1979+ unsafe.putInt(obj, key, Bits.getInt(buf, off));
1980+ break;
1981+
1982+ case 'F':
1983+ unsafe.putFloat(obj, key, Bits.getFloat(buf, off));
1984+ break;
1985+
1986+ case 'J':
1987+ unsafe.putLong(obj, key, Bits.getLong(buf, off));
1988+ break;
1989+
1990+ case 'D':
1991+ unsafe.putDouble(obj, key, Bits.getDouble(buf, off));
1992+ break;
1993+
1994+ default:
1995+ throw new InternalError();
1996+ }
1997+ }
1998+ }
1999+
2000+ /**
2001+ * Fetches the serializable object field values of object obj and
2002+ * stores them in array vals starting at offset 0. The caller is
2003+ * responsible for ensuring that obj is of the proper type.
2004+ */
2005+ void getObjFieldValues(Object obj, Object[] vals) {
2006+ if (obj == null) {
2007+ throw new NullPointerException();
2008+ }
2009+ /* assuming checkDefaultSerialize() has been called on the class
2010+ * descriptor this FieldReflector was obtained from, no field keys
2011+ * in array should be equal to Unsafe.INVALID_FIELD_OFFSET.
2012+ */
2013+ for (int i = numPrimFields; i < fields.length; i++) {
2014+ switch (typeCodes[i]) {
2015+ case 'L':
2016+ case '[':
2017+ vals[offsets[i]] = unsafe.getObject(obj, readKeys[i]);
2018+ break;
2019+
2020+ default:
2021+ throw new InternalError();
2022+ }
2023+ }
2024+ }
2025+
2026+ /**
2027+ * Sets the serializable object fields of object obj using values from
2028+ * array vals starting at offset 0. The caller is responsible for
2029+ * ensuring that obj is of the proper type; however, attempts to set a
2030+ * field with a value of the wrong type will trigger an appropriate
2031+ * ClassCastException.
2032+ */
2033+ void setObjFieldValues(Object obj, Object[] vals) {
2034+ if (obj == null) {
2035+ throw new NullPointerException();
2036+ }
2037+ for (int i = numPrimFields; i < fields.length; i++) {
2038+ long key = writeKeys[i];
2039+ if (key == Unsafe.INVALID_FIELD_OFFSET) {
2040+ continue; // discard value
2041+ }
2042+ switch (typeCodes[i]) {
2043+ case 'L':
2044+ case '[':
2045+ Object val = vals[offsets[i]];
2046+ if (val != null &&
2047+ !types[i - numPrimFields].isInstance(val))
2048+ {
2049+ Field f = fields[i].getField();
2050+ throw new ClassCastException(
2051+ "cannot assign instance of " +
2052+ val.getClass().getName() + " to field " +
2053+ f.getDeclaringClass().getName() + "." +
2054+ f.getName() + " of type " +
2055+ f.getType().getName() + " in instance of " +
2056+ obj.getClass().getName());
2057+ }
2058+ unsafe.putObject(obj, key, val);
2059+ break;
2060+
2061+ default:
2062+ throw new InternalError();
2063+ }
2064+ }
2065+ }
2066+ }
2067+
2068+ /**
2069+ * Matches given set of serializable fields with serializable fields
2070+ * described by the given local class descriptor, and returns a
2071+ * FieldReflector instance capable of setting/getting values from the
2072+ * subset of fields that match (non-matching fields are treated as filler,
2073+ * for which get operations return default values and set operations
2074+ * discard given values). Throws InvalidClassException if unresolvable
2075+ * type conflicts exist between the two sets of fields.
2076+ */
2077+ private static FieldReflector getReflector(ObjectStreamField[] fields,
2078+ ObjectStreamClass localDesc)
2079+ throws InvalidClassException
2080+ {
2081+ // class irrelevant if no fields
2082+ Class<?> cl = (localDesc != null && fields.length > 0) ?
2083+ localDesc.cl : null;
2084+ processQueue(Caches.reflectorsQueue, Caches.reflectors);
2085+ FieldReflectorKey key = new FieldReflectorKey(cl, fields,
2086+ Caches.reflectorsQueue);
2087+ Reference<?> ref = Caches.reflectors.get(key);
2088+ Object entry = null;
2089+ if (ref != null) {
2090+ entry = ref.get();
2091+ }
2092+ EntryFuture future = null;
2093+ if (entry == null) {
2094+ EntryFuture newEntry = new EntryFuture();
2095+ Reference<?> newRef = new SoftReference<>(newEntry);
2096+ do {
2097+ if (ref != null) {
2098+ Caches.reflectors.remove(key, ref);
2099+ }
2100+ ref = Caches.reflectors.putIfAbsent(key, newRef);
2101+ if (ref != null) {
2102+ entry = ref.get();
2103+ }
2104+ } while (ref != null && entry == null);
2105+ if (entry == null) {
2106+ future = newEntry;
2107+ }
2108+ }
2109+
2110+ if (entry instanceof FieldReflector) { // check common case first
2111+ return (FieldReflector) entry;
2112+ } else if (entry instanceof EntryFuture) {
2113+ entry = ((EntryFuture) entry).get();
2114+ } else if (entry == null) {
2115+ try {
2116+ entry = new FieldReflector(matchFields(fields, localDesc));
2117+ } catch (Throwable th) {
2118+ entry = th;
2119+ }
2120+ future.set(entry);
2121+ Caches.reflectors.put(key, new SoftReference<Object>(entry));
2122+ }
2123+
2124+ if (entry instanceof FieldReflector) {
2125+ return (FieldReflector) entry;
2126+ } else if (entry instanceof InvalidClassException) {
2127+ throw (InvalidClassException) entry;
2128+ } else if (entry instanceof RuntimeException) {
2129+ throw (RuntimeException) entry;
2130+ } else if (entry instanceof Error) {
2131+ throw (Error) entry;
2132+ } else {
2133+ throw new InternalError("unexpected entry: " + entry);
2134+ }
2135+ }
2136+
2137+ /**
2138+ * FieldReflector cache lookup key. Keys are considered equal if they
2139+ * refer to the same class and equivalent field formats.
2140+ */
2141+ private static class FieldReflectorKey extends WeakReference<Class<?>> {
2142+
2143+ private final String sigs;
2144+ private final int hash;
2145+ private final boolean nullClass;
2146+
2147+ FieldReflectorKey(Class<?> cl, ObjectStreamField[] fields,
2148+ ReferenceQueue<Class<?>> queue)
2149+ {
2150+ super(cl, queue);
2151+ nullClass = (cl == null);
2152+ StringBuilder sbuf = new StringBuilder();
2153+ for (int i = 0; i < fields.length; i++) {
2154+ ObjectStreamField f = fields[i];
2155+ sbuf.append(f.getName()).append(f.getSignature());
2156+ }
2157+ sigs = sbuf.toString();
2158+ hash = System.identityHashCode(cl) + sigs.hashCode();
2159+ }
2160+
2161+ public int hashCode() {
2162+ return hash;
2163+ }
2164+
2165+ public boolean equals(Object obj) {
2166+ if (obj == this) {
2167+ return true;
2168+ }
2169+
2170+ if (obj instanceof FieldReflectorKey) {
2171+ FieldReflectorKey other = (FieldReflectorKey) obj;
2172+ Class<?> referent;
2173+ return (nullClass ? other.nullClass
2174+ : ((referent = get()) != null) &&
2175+ (referent == other.get())) &&
2176+ sigs.equals(other.sigs);
2177+ } else {
2178+ return false;
2179+ }
2180+ }
2181+ }
2182+
2183+ /**
2184+ * Matches given set of serializable fields with serializable fields
2185+ * obtained from the given local class descriptor (which contain bindings
2186+ * to reflective Field objects). Returns list of ObjectStreamFields in
2187+ * which each ObjectStreamField whose signature matches that of a local
2188+ * field contains a Field object for that field; unmatched
2189+ * ObjectStreamFields contain null Field objects. Shared/unshared settings
2190+ * of the returned ObjectStreamFields also reflect those of matched local
2191+ * ObjectStreamFields. Throws InvalidClassException if unresolvable type
2192+ * conflicts exist between the two sets of fields.
2193+ */
2194+ private static ObjectStreamField[] matchFields(ObjectStreamField[] fields,
2195+ ObjectStreamClass localDesc)
2196+ throws InvalidClassException
2197+ {
2198+ ObjectStreamField[] localFields = (localDesc != null) ?
2199+ localDesc.fields : NO_FIELDS;
2200+
2201+ /*
2202+ * Even if fields == localFields, we cannot simply return localFields
2203+ * here. In previous implementations of serialization,
2204+ * ObjectStreamField.getType() returned Object.class if the
2205+ * ObjectStreamField represented a non-primitive field and belonged to
2206+ * a non-local class descriptor. To preserve this (questionable)
2207+ * behavior, the ObjectStreamField instances returned by matchFields
2208+ * cannot report non-primitive types other than Object.class; hence
2209+ * localFields cannot be returned directly.
2210+ */
2211+
2212+ ObjectStreamField[] matches = new ObjectStreamField[fields.length];
2213+ for (int i = 0; i < fields.length; i++) {
2214+ ObjectStreamField f = fields[i], m = null;
2215+ for (int j = 0; j < localFields.length; j++) {
2216+ ObjectStreamField lf = localFields[j];
2217+ if (f.getName().equals(lf.getName())) {
2218+ if ((f.isPrimitive() || lf.isPrimitive()) &&
2219+ f.getTypeCode() != lf.getTypeCode())
2220+ {
2221+ throw new InvalidClassException(localDesc.name,
2222+ "incompatible types for field " + f.getName());
2223+ }
2224+ if (lf.getField() != null) {
2225+ m = new ObjectStreamField(
2226+ lf.getField(), lf.isUnshared(), false);
2227+ } else {
2228+ m = new ObjectStreamField(
2229+ lf.getName(), lf.getSignature(), lf.isUnshared());
2230+ }
2231+ }
2232+ }
2233+ if (m == null) {
2234+ m = new ObjectStreamField(
2235+ f.getName(), f.getSignature(), false);
2236+ }
2237+ m.setOffset(f.getOffset());
2238+ matches[i] = m;
2239+ }
2240+ return matches;
2241+ }
2242+
2243+ /**
2244+ * Removes from the specified map any keys that have been enqueued
2245+ * on the specified reference queue.
2246+ */
2247+ static void processQueue(ReferenceQueue<Class<?>> queue,
2248+ ConcurrentMap<? extends
2249+ WeakReference<Class<?>>, ?> map)
2250+ {
2251+ Reference<? extends Class<?>> ref;
2252+ while((ref = queue.poll()) != null) {
2253+ map.remove(ref);
2254+ }
2255+ }
2256+
2257+ /**
2258+ * Weak key for Class objects.
2259+ *
2260+ **/
2261+ static class WeakClassKey extends WeakReference<Class<?>> {
2262+ /**
2263+ * saved value of the referent's identity hash code, to maintain
2264+ * a consistent hash code after the referent has been cleared
2265+ */
2266+ private final int hash;
2267+
2268+ /**
2269+ * Create a new WeakClassKey to the given object, registered
2270+ * with a queue.
2271+ */
2272+ WeakClassKey(Class<?> cl, ReferenceQueue<Class<?>> refQueue) {
2273+ super(cl, refQueue);
2274+ hash = System.identityHashCode(cl);
2275+ }
2276+
2277+ /**
2278+ * Returns the identity hash code of the original referent.
2279+ */
2280+ public int hashCode() {
2281+ return hash;
2282+ }
2283+
2284+ /**
2285+ * Returns true if the given object is this identical
2286+ * WeakClassKey instance, or, if this object's referent has not
2287+ * been cleared, if the given object is another WeakClassKey
2288+ * instance with the identical non-null referent as this one.
2289+ */
2290+ public boolean equals(Object obj) {
2291+ if (obj == this) {
2292+ return true;
2293+ }
2294+
2295+ if (obj instanceof WeakClassKey) {
2296+ Object referent = get();
2297+ return (referent != null) &&
2298+ (referent == ((WeakClassKey) obj).get());
2299+ } else {
2300+ return false;
2301+ }
2302+ }
2303+ }
2304+}