Showing the changes to java/pkg/com/sun/beans/decoder/JavaElementHandler.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,151 @@ | |||
| 1 | /* | ||
| 2 | * Copyright (c) 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 | package com.sun.beans.decoder; | ||
| 26 | |||
| 27 | import java.beans.XMLDecoder; | ||
| 28 | |||
| 29 | /** | ||
| 30 | * This class is intended to handle <java> element. | ||
| 31 | * Each element that appears in the body of this element | ||
| 32 | * is evaluated in the context of the decoder itself. | ||
| 33 | * Typically this outer context is used to retrieve the owner of the decoder, | ||
| 34 | * which can be set before reading the archive. | ||
| 35 | * <p>The following atributes are supported: | ||
| 36 | * <dl> | ||
| 37 | * <dt>version | ||
| 38 | * <dd>the Java version (not supported) | ||
| 39 | * <dt>class | ||
| 40 | * <dd>the type of preferable parser (not supported) | ||
| 41 | * <dt>id | ||
| 42 | * <dd>the identifier of the variable that is intended to store the result | ||
| 43 | * </dl> | ||
| 44 | * | ||
| 45 | * @see DocumentHandler#getOwner | ||
| 46 | * @see DocumentHandler#setOwner | ||
| 47 | * @since 1.7 | ||
| 48 | * | ||
| 49 | * @author Sergey A. Malenkov | ||
| 50 | */ | ||
| 51 | final class JavaElementHandler extends ElementHandler { | ||
| 52 | private Class<?> type; | ||
| 53 | private ValueObject value; | ||
| 54 | |||
| 55 | /** | ||
| 56 | * Parses attributes of the element. | ||
| 57 | * The following atributes are supported: | ||
| 58 | * <dl> | ||
| 59 | * <dt>version | ||
| 60 | * <dd>the Java version (not supported) | ||
| 61 | * <dt>class | ||
| 62 | * <dd>the type of preferable parser (not supported) | ||
| 63 | * <dt>id | ||
| 64 | * <dd>the identifier of the variable that is intended to store the result | ||
| 65 | * </dl> | ||
| 66 | * | ||
| 67 | * @param name the attribute name | ||
| 68 | * @param value the attribute value | ||
| 69 | */ | ||
| 70 | @Override | ||
| 71 | public void addAttribute(String name, String value) { | ||
| 72 | if (name.equals("version")) { // NON-NLS: the attribute name | ||
| 73 | // unsupported attribute | ||
| 74 | } else if (name.equals("class")) { // NON-NLS: the attribute name | ||
| 75 | // check class for owner | ||
| 76 | this.type = getOwner().findClass(value); | ||
| 77 | } else { | ||
| 78 | super.addAttribute(name, value); | ||
| 79 | } | ||
| 80 | } | ||
| 81 | |||
| 82 | /** | ||
| 83 | * Adds the argument to the list of readed objects. | ||
| 84 | * | ||
| 85 | * @param argument the value of the element that contained in this one | ||
| 86 | */ | ||
| 87 | @Override | ||
| 88 | protected void addArgument(Object argument) { | ||
| 89 | getOwner().addObject(argument); | ||
| 90 | } | ||
| 91 | |||
| 92 | /** | ||
| 93 | * Tests whether the value of this element can be used | ||
| 94 | * as an argument of the element that contained in this one. | ||
| 95 | * | ||
| 96 | * @return {@code true} if the value of this element should be used | ||
| 97 | * as an argument of the element that contained in this one, | ||
| 98 | * {@code false} otherwise | ||
| 99 | */ | ||
| 100 | @Override | ||
| 101 | protected boolean isArgument() { | ||
| 102 | return false; // do not use owner as object | ||
| 103 | } | ||
| 104 | |||
| 105 | /** | ||
| 106 | * Returns the value of this element. | ||
| 107 | * | ||
| 108 | * @return the value of this element | ||
| 109 | */ | ||
| 110 | @Override | ||
| 111 | protected ValueObject getValueObject() { | ||
| 112 | if (this.value == null) { | ||
| 113 | this.value = ValueObjectImpl.create(getValue()); | ||
| 114 | } | ||
| 115 | return this.value; | ||
| 116 | } | ||
| 117 | |||
| 118 | /** | ||
| 119 | * Returns the owner of the owner document handler | ||
| 120 | * as a value of <java> element. | ||
| 121 | * | ||
| 122 | * @return the owner of the owner document handler | ||
| 123 | */ | ||
| 124 | private Object getValue() { | ||
| 125 | Object owner = getOwner().getOwner(); | ||
| 126 | if ((this.type == null) || isValid(owner)) { | ||
| 127 | return owner; | ||
| 128 | } | ||
| 129 | if (owner instanceof XMLDecoder) { | ||
| 130 | XMLDecoder decoder = (XMLDecoder) owner; | ||
| 131 | owner = decoder.getOwner(); | ||
| 132 | if (isValid(owner)) { | ||
| 133 | return owner; | ||
| 134 | } | ||
| 135 | } | ||
| 136 | throw new IllegalStateException("Unexpected owner class: " + owner.getClass().getName()); | ||
| 137 | } | ||
| 138 | |||
| 139 | /** | ||
| 140 | * Validates the owner of the <java> element. | ||
| 141 | * The owner is valid if it is {@code null} or an instance | ||
| 142 | * of the class specified by the {@code class} attribute. | ||
| 143 | * | ||
| 144 | * @param owner the owner of the <java> element | ||
| 145 | * @return {@code true} if the {@code owner} is valid; | ||
| 146 | * {@code false} otherwise | ||
| 147 | */ | ||
| 148 | private boolean isValid(Object owner) { | ||
| 149 | return (owner == null) || this.type.isInstance(owner); | ||
| 150 | } | ||
| 151 | } | ||