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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 com.sun.beans.finder.FieldFinder; | ||
| 28 | |||
| 29 | import java.lang.reflect.Field; | ||
| 30 | |||
| 31 | /** | ||
| 32 | * This class is intended to handle <field> element. | ||
| 33 | * This element simplifies access to the fields. | ||
| 34 | * If the {@code class} attribute is specified | ||
| 35 | * this element accesses static field of specified class. | ||
| 36 | * This element defines getter if it contains no argument. | ||
| 37 | * It returns the value of the field in this case. | ||
| 38 | * For example:<pre> | ||
| 39 | * <field name="TYPE" class="java.lang.Long"/></pre> | ||
| 40 | * is equivalent to {@code Long.TYPE} in Java code. | ||
| 41 | * This element defines setter if it contains one argument. | ||
| 42 | * It does not return the value of the field in this case. | ||
| 43 | * For example:<pre> | ||
| 44 | * <field name="id"><int>0</int></field></pre> | ||
| 45 | * is equivalent to {@code id = 0} in Java code. | ||
| 46 | * <p>The following atributes are supported: | ||
| 47 | * <dl> | ||
| 48 | * <dt>name | ||
| 49 | * <dd>the field name | ||
| 50 | * <dt>class | ||
| 51 | * <dd>the type is used for static fields only | ||
| 52 | * <dt>id | ||
| 53 | * <dd>the identifier of the variable that is intended to store the result | ||
| 54 | * </dl> | ||
| 55 | * | ||
| 56 | * @since 1.7 | ||
| 57 | * | ||
| 58 | * @author Sergey A. Malenkov | ||
| 59 | */ | ||
| 60 | final class FieldElementHandler extends AccessorElementHandler { | ||
| 61 | private Class<?> type; | ||
| 62 | |||
| 63 | /** | ||
| 64 | * Parses attributes of the element. | ||
| 65 | * The following atributes are supported: | ||
| 66 | * <dl> | ||
| 67 | * <dt>name | ||
| 68 | * <dd>the field name | ||
| 69 | * <dt>class | ||
| 70 | * <dd>the type is used for static fields only | ||
| 71 | * <dt>id | ||
| 72 | * <dd>the identifier of the variable that is intended to store the result | ||
| 73 | * </dl> | ||
| 74 | * | ||
| 75 | * @param name the attribute name | ||
| 76 | * @param value the attribute value | ||
| 77 | */ | ||
| 78 | @Override | ||
| 79 | public void addAttribute(String name, String value) { | ||
| 80 | if (name.equals("class")) { // NON-NLS: the attribute name | ||
| 81 | this.type = getOwner().findClass(value); | ||
| 82 | } else { | ||
| 83 | super.addAttribute(name, value); | ||
| 84 | } | ||
| 85 | } | ||
| 86 | |||
| 87 | /** | ||
| 88 | * Tests whether the value of this element can be used | ||
| 89 | * as an argument of the element that contained in this one. | ||
| 90 | * | ||
| 91 | * @return {@code true} if the value of this element should be used | ||
| 92 | * as an argument of the element that contained in this one, | ||
| 93 | * {@code false} otherwise | ||
| 94 | */ | ||
| 95 | @Override | ||
| 96 | protected boolean isArgument() { | ||
| 97 | return super.isArgument() && (this.type != null); // only static accessor can be used an argument | ||
| 98 | } | ||
| 99 | |||
| 100 | /** | ||
| 101 | * Returns the context of the field. | ||
| 102 | * The context of the static field is the class object. | ||
| 103 | * The context of the non-static field is the value of the parent element. | ||
| 104 | * | ||
| 105 | * @return the context of the field | ||
| 106 | */ | ||
| 107 | @Override | ||
| 108 | protected Object getContextBean() { | ||
| 109 | return (this.type != null) | ||
| 110 | ? this.type | ||
| 111 | : super.getContextBean(); | ||
| 112 | } | ||
| 113 | |||
| 114 | /** | ||
| 115 | * Returns the value of the field with specified {@code name}. | ||
| 116 | * | ||
| 117 | * @param name the name of the field | ||
| 118 | * @return the value of the specified field | ||
| 119 | */ | ||
| 120 | @Override | ||
| 121 | protected Object getValue(String name) { | ||
| 122 | try { | ||
| 123 | return getFieldValue(getContextBean(), name); | ||
| 124 | } | ||
| 125 | catch (Exception exception) { | ||
| 126 | getOwner().handleException(exception); | ||
| 127 | } | ||
| 128 | return null; | ||
| 129 | } | ||
| 130 | |||
| 131 | /** | ||
| 132 | * Sets the new value for the field with specified {@code name}. | ||
| 133 | * | ||
| 134 | * @param name the name of the field | ||
| 135 | * @param value the new value for the specified field | ||
| 136 | */ | ||
| 137 | @Override | ||
| 138 | protected void setValue(String name, Object value) { | ||
| 139 | try { | ||
| 140 | setFieldValue(getContextBean(), name, value); | ||
| 141 | } | ||
| 142 | catch (Exception exception) { | ||
| 143 | getOwner().handleException(exception); | ||
| 144 | } | ||
| 145 | } | ||
| 146 | |||
| 147 | /** | ||
| 148 | * Performs the search of the field with specified {@code name} | ||
| 149 | * in specified context and returns its value. | ||
| 150 | * | ||
| 151 | * @param bean the context bean that contains field | ||
| 152 | * @param name the name of the field | ||
| 153 | * @return the value of the field | ||
| 154 | * @throws IllegalAccessException if the field is not accesible | ||
| 155 | * @throws NoSuchFieldException if the field is not found | ||
| 156 | */ | ||
| 157 | static Object getFieldValue(Object bean, String name) throws IllegalAccessException, NoSuchFieldException { | ||
| 158 | return findField(bean, name).get(bean); | ||
| 159 | } | ||
| 160 | |||
| 161 | /** | ||
| 162 | * Performs the search of the field with specified {@code name} | ||
| 163 | * in specified context and updates its value. | ||
| 164 | * | ||
| 165 | * @param bean the context bean that contains field | ||
| 166 | * @param name the name of the field | ||
| 167 | * @param value the new value for the field | ||
| 168 | * @throws IllegalAccessException if the field is not accesible | ||
| 169 | * @throws NoSuchFieldException if the field is not found | ||
| 170 | */ | ||
| 171 | private static void setFieldValue(Object bean, String name, Object value) throws IllegalAccessException, NoSuchFieldException { | ||
| 172 | findField(bean, name).set(bean, value); | ||
| 173 | } | ||
| 174 | |||
| 175 | /** | ||
| 176 | * Performs the search of the field | ||
| 177 | * with specified {@code name} in specified context. | ||
| 178 | * | ||
| 179 | * @param bean the context bean that contains field | ||
| 180 | * @param name the name of the field | ||
| 181 | * @return field object that represents found field | ||
| 182 | * @throws NoSuchFieldException if the field is not found | ||
| 183 | */ | ||
| 184 | private static Field findField(Object bean, String name) throws NoSuchFieldException { | ||
| 185 | return (bean instanceof Class<?>) | ||
| 186 | ? FieldFinder.findStaticField((Class<?>) bean, name) | ||
| 187 | : FieldFinder.findField(bean.getClass(), name); | ||
| 188 | } | ||
| 189 | } | ||