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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 | } | ||