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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 2008, 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 sun.reflect.annotation; | ||
| 27 | |||
| 28 | import java.lang.annotation.*; | ||
| 29 | import java.lang.reflect.*; | ||
| 30 | import java.io.Serializable; | ||
| 31 | import java.util.*; | ||
| 32 | import java.lang.annotation.*; | ||
| 33 | import java.security.AccessController; | ||
| 34 | import java.security.PrivilegedAction; | ||
| 35 | |||
| 36 | /** | ||
| 37 | * InvocationHandler for dynamic proxy implementation of Annotation. | ||
| 38 | * | ||
| 39 | * @author Josh Bloch | ||
| 40 | * @since 1.5 | ||
| 41 | */ | ||
| 42 | class AnnotationInvocationHandler implements InvocationHandler, Serializable { | ||
| 43 | private final Class<? extends Annotation> type; | ||
| 44 | private final Map<String, Object> memberValues; | ||
| 45 | |||
| 46 | AnnotationInvocationHandler(Class<? extends Annotation> type, Map<String, Object> memberValues) { | ||
| 47 | this.type = type; | ||
| 48 | this.memberValues = memberValues; | ||
| 49 | } | ||
| 50 | |||
| 51 | public Object invoke(Object proxy, Method method, Object[] args) { | ||
| 52 | String member = method.getName(); | ||
| 53 | Class<?>[] paramTypes = method.getParameterTypes(); | ||
| 54 | |||
| 55 | // Handle Object and Annotation methods | ||
| 56 | if (member.equals("equals") && paramTypes.length == 1 && | ||
| 57 | paramTypes[0] == Object.class) | ||
| 58 | return equalsImpl(args[0]); | ||
| 59 | assert paramTypes.length == 0; | ||
| 60 | if (member.equals("toString")) | ||
| 61 | return toStringImpl(); | ||
| 62 | if (member.equals("hashCode")) | ||
| 63 | return hashCodeImpl(); | ||
| 64 | if (member.equals("annotationType")) | ||
| 65 | return type; | ||
| 66 | |||
| 67 | // Handle annotation member accessors | ||
| 68 | Object result = memberValues.get(member); | ||
| 69 | |||
| 70 | if (result == null) | ||
| 71 | throw new IncompleteAnnotationException(type, member); | ||
| 72 | |||
| 73 | if (result instanceof ExceptionProxy) | ||
| 74 | throw ((ExceptionProxy) result).generateException(); | ||
| 75 | |||
| 76 | if (result.getClass().isArray() && Array.getLength(result) != 0) | ||
| 77 | result = cloneArray(result); | ||
| 78 | |||
| 79 | return result; | ||
| 80 | } | ||
| 81 | |||
| 82 | /** | ||
| 83 | * This method, which clones its array argument, would not be necessary | ||
| 84 | * if Cloneable had a public clone method. | ||
| 85 | */ | ||
| 86 | private Object cloneArray(Object array) { | ||
| 87 | Class<?> type = array.getClass(); | ||
| 88 | |||
| 89 | if (type == byte[].class) { | ||
| 90 | byte[] byteArray = (byte[])array; | ||
| 91 | return byteArray.clone(); | ||
| 92 | } | ||
| 93 | if (type == char[].class) { | ||
| 94 | char[] charArray = (char[])array; | ||
| 95 | return charArray.clone(); | ||
| 96 | } | ||
| 97 | if (type == double[].class) { | ||
| 98 | double[] doubleArray = (double[])array; | ||
| 99 | return doubleArray.clone(); | ||
| 100 | } | ||
| 101 | if (type == float[].class) { | ||
| 102 | float[] floatArray = (float[])array; | ||
| 103 | return floatArray.clone(); | ||
| 104 | } | ||
| 105 | if (type == int[].class) { | ||
| 106 | int[] intArray = (int[])array; | ||
| 107 | return intArray.clone(); | ||
| 108 | } | ||
| 109 | if (type == long[].class) { | ||
| 110 | long[] longArray = (long[])array; | ||
| 111 | return longArray.clone(); | ||
| 112 | } | ||
| 113 | if (type == short[].class) { | ||
| 114 | short[] shortArray = (short[])array; | ||
| 115 | return shortArray.clone(); | ||
| 116 | } | ||
| 117 | if (type == boolean[].class) { | ||
| 118 | boolean[] booleanArray = (boolean[])array; | ||
| 119 | return booleanArray.clone(); | ||
| 120 | } | ||
| 121 | |||
| 122 | Object[] objectArray = (Object[])array; | ||
| 123 | return objectArray.clone(); | ||
| 124 | } | ||
| 125 | |||
| 126 | |||
| 127 | /** | ||
| 128 | * Implementation of dynamicProxy.toString() | ||
| 129 | */ | ||
| 130 | private String toStringImpl() { | ||
| 131 | StringBuffer result = new StringBuffer(128); | ||
| 132 | result.append('@'); | ||
| 133 | result.append(type.getName()); | ||
| 134 | result.append('('); | ||
| 135 | boolean firstMember = true; | ||
| 136 | for (Map.Entry<String, Object> e : memberValues.entrySet()) { | ||
| 137 | if (firstMember) | ||
| 138 | firstMember = false; | ||
| 139 | else | ||
| 140 | result.append(", "); | ||
| 141 | |||
| 142 | result.append(e.getKey()); | ||
| 143 | result.append('='); | ||
| 144 | result.append(memberValueToString(e.getValue())); | ||
| 145 | } | ||
| 146 | result.append(')'); | ||
| 147 | return result.toString(); | ||
| 148 | } | ||
| 149 | |||
| 150 | /** | ||
| 151 | * Translates a member value (in "dynamic proxy return form") into a string | ||
| 152 | */ | ||
| 153 | private static String memberValueToString(Object value) { | ||
| 154 | Class<?> type = value.getClass(); | ||
| 155 | if (!type.isArray()) // primitive, string, class, enum const, | ||
| 156 | // or annotation | ||
| 157 | return value.toString(); | ||
| 158 | |||
| 159 | if (type == byte[].class) | ||
| 160 | return Arrays.toString((byte[]) value); | ||
| 161 | if (type == char[].class) | ||
| 162 | return Arrays.toString((char[]) value); | ||
| 163 | if (type == double[].class) | ||
| 164 | return Arrays.toString((double[]) value); | ||
| 165 | if (type == float[].class) | ||
| 166 | return Arrays.toString((float[]) value); | ||
| 167 | if (type == int[].class) | ||
| 168 | return Arrays.toString((int[]) value); | ||
| 169 | if (type == long[].class) | ||
| 170 | return Arrays.toString((long[]) value); | ||
| 171 | if (type == short[].class) | ||
| 172 | return Arrays.toString((short[]) value); | ||
| 173 | if (type == boolean[].class) | ||
| 174 | return Arrays.toString((boolean[]) value); | ||
| 175 | return Arrays.toString((Object[]) value); | ||
| 176 | } | ||
| 177 | |||
| 178 | /** | ||
| 179 | * Implementation of dynamicProxy.equals(Object o) | ||
| 180 | */ | ||
| 181 | private Boolean equalsImpl(Object o) { | ||
| 182 | if (o == this) | ||
| 183 | return true; | ||
| 184 | |||
| 185 | if (!type.isInstance(o)) | ||
| 186 | return false; | ||
| 187 | for (Method memberMethod : getMemberMethods()) { | ||
| 188 | String member = memberMethod.getName(); | ||
| 189 | Object ourValue = memberValues.get(member); | ||
| 190 | Object hisValue = null; | ||
| 191 | AnnotationInvocationHandler hisHandler = asOneOfUs(o); | ||
| 192 | if (hisHandler != null) { | ||
| 193 | hisValue = hisHandler.memberValues.get(member); | ||
| 194 | } else { | ||
| 195 | try { | ||
| 196 | hisValue = memberMethod.invoke(o); | ||
| 197 | } catch (InvocationTargetException e) { | ||
| 198 | return false; | ||
| 199 | } catch (IllegalAccessException e) { | ||
| 200 | throw new AssertionError(e); | ||
| 201 | } | ||
| 202 | } | ||
| 203 | if (!memberValueEquals(ourValue, hisValue)) | ||
| 204 | return false; | ||
| 205 | } | ||
| 206 | return true; | ||
| 207 | } | ||
| 208 | |||
| 209 | /** | ||
| 210 | * Returns an object's invocation handler if that object is a dynamic | ||
| 211 | * proxy with a handler of type AnnotationInvocationHandler. | ||
| 212 | * Returns null otherwise. | ||
| 213 | */ | ||
| 214 | private AnnotationInvocationHandler asOneOfUs(Object o) { | ||
| 215 | if (Proxy.isProxyClass(o.getClass())) { | ||
| 216 | InvocationHandler handler = Proxy.getInvocationHandler(o); | ||
| 217 | if (handler instanceof AnnotationInvocationHandler) | ||
| 218 | return (AnnotationInvocationHandler) handler; | ||
| 219 | } | ||
| 220 | return null; | ||
| 221 | } | ||
| 222 | |||
| 223 | /** | ||
| 224 | * Returns true iff the two member values in "dynamic proxy return form" | ||
| 225 | * are equal using the appropriate equality function depending on the | ||
| 226 | * member type. The two values will be of the same type unless one of | ||
| 227 | * the containing annotations is ill-formed. If one of the containing | ||
| 228 | * annotations is ill-formed, this method will return false unless the | ||
| 229 | * two members are identical object references. | ||
| 230 | */ | ||
| 231 | private static boolean memberValueEquals(Object v1, Object v2) { | ||
| 232 | Class<?> type = v1.getClass(); | ||
| 233 | |||
| 234 | // Check for primitive, string, class, enum const, annotation, | ||
| 235 | // or ExceptionProxy | ||
| 236 | if (!type.isArray()) | ||
| 237 | return v1.equals(v2); | ||
| 238 | |||
| 239 | // Check for array of string, class, enum const, annotation, | ||
| 240 | // or ExceptionProxy | ||
| 241 | if (v1 instanceof Object[] && v2 instanceof Object[]) | ||
| 242 | return Arrays.equals((Object[]) v1, (Object[]) v2); | ||
| 243 | |||
| 244 | // Check for ill formed annotation(s) | ||
| 245 | if (v2.getClass() != type) | ||
| 246 | return false; | ||
| 247 | |||
| 248 | // Deal with array of primitives | ||
| 249 | if (type == byte[].class) | ||
| 250 | return Arrays.equals((byte[]) v1, (byte[]) v2); | ||
| 251 | if (type == char[].class) | ||
| 252 | return Arrays.equals((char[]) v1, (char[]) v2); | ||
| 253 | if (type == double[].class) | ||
| 254 | return Arrays.equals((double[]) v1, (double[]) v2); | ||
| 255 | if (type == float[].class) | ||
| 256 | return Arrays.equals((float[]) v1, (float[]) v2); | ||
| 257 | if (type == int[].class) | ||
| 258 | return Arrays.equals((int[]) v1, (int[]) v2); | ||
| 259 | if (type == long[].class) | ||
| 260 | return Arrays.equals((long[]) v1, (long[]) v2); | ||
| 261 | if (type == short[].class) | ||
| 262 | return Arrays.equals((short[]) v1, (short[]) v2); | ||
| 263 | assert type == boolean[].class; | ||
| 264 | return Arrays.equals((boolean[]) v1, (boolean[]) v2); | ||
| 265 | } | ||
| 266 | |||
| 267 | /** | ||
| 268 | * Returns the member methods for our annotation type. These are | ||
| 269 | * obtained lazily and cached, as they're expensive to obtain | ||
| 270 | * and we only need them if our equals method is invoked (which should | ||
| 271 | * be rare). | ||
| 272 | */ | ||
| 273 | private Method[] getMemberMethods() { | ||
| 274 | if (memberMethods == null) { | ||
| 275 | memberMethods = AccessController.doPrivileged( | ||
| 276 | new PrivilegedAction<Method[]>() { | ||
| 277 | public Method[] run() { | ||
| 278 | final Method[] mm = type.getDeclaredMethods(); | ||
| 279 | AccessibleObject.setAccessible(mm, true); | ||
| 280 | return mm; | ||
| 281 | } | ||
| 282 | }); | ||
| 283 | } | ||
| 284 | return memberMethods; | ||
| 285 | } | ||
| 286 | private transient volatile Method[] memberMethods = null; | ||
| 287 | |||
| 288 | /** | ||
| 289 | * Implementation of dynamicProxy.hashCode() | ||
| 290 | */ | ||
| 291 | private int hashCodeImpl() { | ||
| 292 | int result = 0; | ||
| 293 | for (Map.Entry<String, Object> e : memberValues.entrySet()) { | ||
| 294 | result += (127 * e.getKey().hashCode()) ^ | ||
| 295 | memberValueHashCode(e.getValue()); | ||
| 296 | } | ||
| 297 | return result; | ||
| 298 | } | ||
| 299 | |||
| 300 | /** | ||
| 301 | * Computes hashCode of a member value (in "dynamic proxy return form") | ||
| 302 | */ | ||
| 303 | private static int memberValueHashCode(Object value) { | ||
| 304 | Class<?> type = value.getClass(); | ||
| 305 | if (!type.isArray()) // primitive, string, class, enum const, | ||
| 306 | // or annotation | ||
| 307 | return value.hashCode(); | ||
| 308 | |||
| 309 | if (type == byte[].class) | ||
| 310 | return Arrays.hashCode((byte[]) value); | ||
| 311 | if (type == char[].class) | ||
| 312 | return Arrays.hashCode((char[]) value); | ||
| 313 | if (type == double[].class) | ||
| 314 | return Arrays.hashCode((double[]) value); | ||
| 315 | if (type == float[].class) | ||
| 316 | return Arrays.hashCode((float[]) value); | ||
| 317 | if (type == int[].class) | ||
| 318 | return Arrays.hashCode((int[]) value); | ||
| 319 | if (type == long[].class) | ||
| 320 | return Arrays.hashCode((long[]) value); | ||
| 321 | if (type == short[].class) | ||
| 322 | return Arrays.hashCode((short[]) value); | ||
| 323 | if (type == boolean[].class) | ||
| 324 | return Arrays.hashCode((boolean[]) value); | ||
| 325 | return Arrays.hashCode((Object[]) value); | ||
| 326 | } | ||
| 327 | |||
| 328 | private void readObject(java.io.ObjectInputStream s) | ||
| 329 | throws java.io.IOException, ClassNotFoundException { | ||
| 330 | s.defaultReadObject(); | ||
| 331 | |||
| 332 | |||
| 333 | // Check to make sure that types have not evolved incompatibly | ||
| 334 | |||
| 335 | AnnotationType annotationType = null; | ||
| 336 | try { | ||
| 337 | annotationType = AnnotationType.getInstance(type); | ||
| 338 | } catch(IllegalArgumentException e) { | ||
| 339 | // Class is no longer an annotation type; all bets are off | ||
| 340 | return; | ||
| 341 | } | ||
| 342 | |||
| 343 | Map<String, Class<?>> memberTypes = annotationType.memberTypes(); | ||
| 344 | |||
| 345 | for (Map.Entry<String, Object> memberValue : memberValues.entrySet()) { | ||
| 346 | String name = memberValue.getKey(); | ||
| 347 | Class<?> memberType = memberTypes.get(name); | ||
| 348 | if (memberType != null) { // i.e. member still exists | ||
| 349 | Object value = memberValue.getValue(); | ||
| 350 | if (!(memberType.isInstance(value) || | ||
| 351 | value instanceof ExceptionProxy)) { | ||
| 352 | memberValue.setValue( | ||
| 353 | new AnnotationTypeMismatchExceptionProxy( | ||
| 354 | value.getClass() + "[" + value + "]").setMember( | ||
| 355 | annotationType.members().get(name))); | ||
| 356 | } | ||
| 357 | } | ||
| 358 | } | ||
| 359 | } | ||
| 360 | } | ||