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| 1 | /* | ||
| 2 | * Copyright (c) 2003, 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 javax.sql.rowset.serial; | ||
| 27 | |||
| 28 | import java.io.*; | ||
| 29 | import java.lang.reflect.*; | ||
| 30 | import javax.sql.rowset.RowSetWarning; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * A serializable mapping in the Java programming language of an SQL | ||
| 34 | * <code>JAVA_OBJECT</code> value. Assuming the Java object | ||
| 35 | * implements the <code>Serializable</code> interface, this class simply wraps the | ||
| 36 | * serialization process. | ||
| 37 | * <P> | ||
| 38 | * If however, the serialization is not possible because | ||
| 39 | * the Java object is not immediately serializable, this class will | ||
| 40 | * attempt to serialize all non-static members to permit the object | ||
| 41 | * state to be serialized. | ||
| 42 | * Static or transient fields cannot be serialized; an attempt to serialize | ||
| 43 | * them will result in a <code>SerialException</code> object being thrown. | ||
| 44 | * | ||
| 45 | * @author Jonathan Bruce | ||
| 46 | */ | ||
| 47 | public class SerialJavaObject implements Serializable, Cloneable { | ||
| 48 | |||
| 49 | /** | ||
| 50 | * Placeholder for object to be serialized. | ||
| 51 | */ | ||
| 52 | private final Object obj; | ||
| 53 | |||
| 54 | |||
| 55 | /** | ||
| 56 | * Placeholder for all fields in the <code>JavaObject</code> being serialized. | ||
| 57 | */ | ||
| 58 | private transient Field[] fields; | ||
| 59 | |||
| 60 | /** | ||
| 61 | * Constructor for <code>SerialJavaObject</code> helper class. | ||
| 62 | * <p> | ||
| 63 | * | ||
| 64 | * @param obj the Java <code>Object</code> to be serialized | ||
| 65 | * @throws SerialException if the object is found not to be serializable | ||
| 66 | */ | ||
| 67 | public SerialJavaObject(Object obj) throws SerialException { | ||
| 68 | |||
| 69 | // if any static fields are found, an exception | ||
| 70 | // should be thrown | ||
| 71 | |||
| 72 | |||
| 73 | // get Class. Object instance should always be available | ||
| 74 | Class<?> c = obj.getClass(); | ||
| 75 | |||
| 76 | // determine if object implements Serializable i/f | ||
| 77 | if (!(obj instanceof java.io.Serializable)) { | ||
| 78 | setWarning(new RowSetWarning("Warning, the object passed to the constructor does not implement Serializable")); | ||
| 79 | } | ||
| 80 | |||
| 81 | // can only determine public fields (obviously). If | ||
| 82 | // any of these are static, this should invalidate | ||
| 83 | // the action of attempting to persist these fields | ||
| 84 | // in a serialized form | ||
| 85 | |||
| 86 | boolean anyStaticFields = false; | ||
| 87 | fields = c.getFields(); | ||
| 88 | |||
| 89 | for (int i = 0; i < fields.length; i++ ) { | ||
| 90 | if ( fields[i].getModifiers() == Modifier.STATIC ) { | ||
| 91 | anyStaticFields = true; | ||
| 92 | } | ||
| 93 | } | ||
| 94 | |||
| 95 | |||
| 96 | if (anyStaticFields) { | ||
| 97 | throw new SerialException("Located static fields in " + | ||
| 98 | "object instance. Cannot serialize"); | ||
| 99 | } | ||
| 100 | |||
| 101 | this.obj = obj; | ||
| 102 | } | ||
| 103 | |||
| 104 | /** | ||
| 105 | * Returns an <code>Object</code> that is a copy of this <code>SerialJavaObject</code> | ||
| 106 | * object. | ||
| 107 | * | ||
| 108 | * @return a copy of this <code>SerialJavaObject</code> object as an | ||
| 109 | * <code>Object</code> in the Java programming language | ||
| 110 | * @throws SerialException if the instance is corrupt | ||
| 111 | */ | ||
| 112 | public Object getObject() throws SerialException { | ||
| 113 | return this.obj; | ||
| 114 | } | ||
| 115 | |||
| 116 | /** | ||
| 117 | * Returns an array of <code>Field</code> objects that contains each | ||
| 118 | * field of the object that this helper class is serializing. | ||
| 119 | * | ||
| 120 | * @return an array of <code>Field</code> objects | ||
| 121 | * @throws SerialException if an error is encountered accessing | ||
| 122 | * the serialized object | ||
| 123 | */ | ||
| 124 | public Field[] getFields() throws SerialException { | ||
| 125 | if (fields != null) { | ||
| 126 | Class<?> c = this.obj.getClass(); | ||
| 127 | return c.getFields(); | ||
| 128 | } else { | ||
| 129 | throw new SerialException("SerialJavaObject does not contain" + | ||
| 130 | " a serialized object instance"); | ||
| 131 | } | ||
| 132 | } | ||
| 133 | |||
| 134 | /** | ||
| 135 | * The identifier that assists in the serialization of this | ||
| 136 | * <code>SerialJavaObject</code> object. | ||
| 137 | */ | ||
| 138 | static final long serialVersionUID = -1465795139032831023L; | ||
| 139 | |||
| 140 | /** | ||
| 141 | * A container for the warnings issued on this <code>SerialJavaObject</code> | ||
| 142 | * object. When there are multiple warnings, each warning is chained to the | ||
| 143 | * previous warning. | ||
| 144 | */ | ||
| 145 | java.util.Vector chain; | ||
| 146 | |||
| 147 | /** | ||
| 148 | * Registers the given warning. | ||
| 149 | */ | ||
| 150 | private void setWarning(RowSetWarning e) { | ||
| 151 | if (chain == null) { | ||
| 152 | chain = new java.util.Vector(); | ||
| 153 | } | ||
| 154 | chain.add(e); | ||
| 155 | } | ||
| 156 | } | ||