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| 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.lang.reflect.Array; | |
| 28 | + | |
| 29 | +/** | |
| 30 | + * This class is intended to handle <array> element, | |
| 31 | + * that is used to array creation. | |
| 32 | + * The {@code length} attribute specifies the length of the array. | |
| 33 | + * The {@code class} attribute specifies the elements type. | |
| 34 | + * The {@link Object} type is used by default. | |
| 35 | + * For example:<pre> | |
| 36 | + * <array length="10"/></pre> | |
| 37 | + * is equivalent to {@code new Component[10]} in Java code. | |
| 38 | + * The {@code set} and {@code get} methods, | |
| 39 | + * as defined in the {@link java.util.List} interface, | |
| 40 | + * can be used as if they could be applied to array instances. | |
| 41 | + * The {@code index} attribute can thus be used with arrays. | |
| 42 | + * For example:<pre> | |
| 43 | + * <array length="3" class="java.lang.String"> | |
| 44 | + * <void index="1"> | |
| 45 | + * <string>Hello, world</string> | |
| 46 | + * </void> | |
| 47 | + * </array></pre> | |
| 48 | + * is equivalent to the following Java code:<pre> | |
| 49 | + * String[] s = new String[3]; | |
| 50 | + * s[1] = "Hello, world";</pre> | |
| 51 | + * It is possible to omit the {@code length} attribute and | |
| 52 | + * specify the values directly, without using {@code void} tags. | |
| 53 | + * The length of the array is equal to the number of values specified. | |
| 54 | + * For example:<pre> | |
| 55 | + * <array id="array" class="int"> | |
| 56 | + * <int>123</int> | |
| 57 | + * <int>456</int> | |
| 58 | + * </array></pre> | |
| 59 | + * is equivalent to {@code int[] array = {123, 456}} in Java code. | |
| 60 | + * <p>The following atributes are supported: | |
| 61 | + * <dl> | |
| 62 | + * <dt>length | |
| 63 | + * <dd>the array length | |
| 64 | + * <dt>class | |
| 65 | + * <dd>the type of object for instantiation | |
| 66 | + * <dt>id | |
| 67 | + * <dd>the identifier of the variable that is intended to store the result | |
| 68 | + * </dl> | |
| 69 | + * | |
| 70 | + * @since 1.7 | |
| 71 | + * | |
| 72 | + * @author Sergey A. Malenkov | |
| 73 | + */ | |
| 74 | +final class ArrayElementHandler extends NewElementHandler { | |
| 75 | + private Integer length; | |
| 76 | + | |
| 77 | + /** | |
| 78 | + * Parses attributes of the element. | |
| 79 | + * The following atributes are supported: | |
| 80 | + * <dl> | |
| 81 | + * <dt>length | |
| 82 | + * <dd>the array length | |
| 83 | + * <dt>class | |
| 84 | + * <dd>the type of object for instantiation | |
| 85 | + * <dt>id | |
| 86 | + * <dd>the identifier of the variable that is intended to store the result | |
| 87 | + * </dl> | |
| 88 | + * | |
| 89 | + * @param name the attribute name | |
| 90 | + * @param value the attribute value | |
| 91 | + */ | |
| 92 | + @Override | |
| 93 | + public void addAttribute(String name, String value) { | |
| 94 | + if (name.equals("length")) { // NON-NLS: the attribute name | |
| 95 | + this.length = Integer.valueOf(value); | |
| 96 | + } else { | |
| 97 | + super.addAttribute(name, value); | |
| 98 | + } | |
| 99 | + } | |
| 100 | + | |
| 101 | + /** | |
| 102 | + * Calculates the value of this element | |
| 103 | + * if the lentgh attribute is set. | |
| 104 | + */ | |
| 105 | + @Override | |
| 106 | + public void startElement() { | |
| 107 | + if (this.length != null) { | |
| 108 | + getValueObject(); | |
| 109 | + } | |
| 110 | + } | |
| 111 | + | |
| 112 | + /** | |
| 113 | + * Creates an instance of the array. | |
| 114 | + * | |
| 115 | + * @param type the base class | |
| 116 | + * @param args the array of arguments | |
| 117 | + * @return the value of this element | |
| 118 | + */ | |
| 119 | + @Override | |
| 120 | + protected ValueObject getValueObject(Class<?> type, Object[] args) { | |
| 121 | + if (type == null) { | |
| 122 | + type = Object.class; | |
| 123 | + } | |
| 124 | + if (this.length != null) { | |
| 125 | + return ValueObjectImpl.create(Array.newInstance(type, this.length)); | |
| 126 | + } | |
| 127 | + Object array = Array.newInstance(type, args.length); | |
| 128 | + for (int i = 0; i < args.length; i++) { | |
| 129 | + Array.set(array, i, args[i]); | |
| 130 | + } | |
| 131 | + return ValueObjectImpl.create(array); | |
| 132 | + } | |
| 133 | +} | |