    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.beanutils2;
    018
    019/**
    020 * <p>
    021 * Decorates a {@link DynaBean} to provide {@code Map} behavior.
    022 * </p>
    023 *
    024 * <p>
    025 * The motivation for this implementation is to provide access to {@link DynaBean} properties in technologies that are unaware of BeanUtils and
    026 * {@link DynaBean}s - such as the expression languages of JSTL and JSF.
    027 * </p>
    028 *
    029 * <p>
    030 * This can be achieved either by wrapping the {@link DynaBean} prior to providing it to the technology to process or by providing a {@code Map} accessor method
    031 * on the DynaBean implementation:
    032 * </p>
    033 *
    034 * <pre>
    035 * <code>
    036 *         public Map&lt;String, Object&gt; getMap() {
    037 *             return new DynaBeanPropertyMapDecorator(this);
    038 *         }</code>
    039 * </pre>
    040 *
    041 * <p>
    042 * This, for example, could be used in JSTL in the following way to access a DynaBean's {@code fooProperty}:
    043 * </p>
    044 * <ul>
    045 * <li>{@code ${myDynaBean.<strong>map</strong>.fooProperty}}</li>
    046 * </ul>
    047 *
    048 * <h2>Usage</h2>
    049 *
    050 * <p>
    051 * To decorate a {@link DynaBean} simply instantiate this class with the target {@link DynaBean}:
    052 * </p>
    053 *
    054 * <ul>
    055 * <li>{@code Map&lt;String, Object&gt; fooMap = new DynaBeanPropertyMapDecorator(fooDynaBean);}</li>
    056 * </ul>
    057 *
    058 * <p>
    059 * The above example creates a <strong><em>read only</em></strong> {@code Map}. To create a {@code Map} which can be modified, construct a
    060 * {@code DynaBeanPropertyMapDecorator} with the <strong><em>read only</em></strong> attribute set to {@code false}:
    061 * </p>
    062 *
    063 * <ul>
    064 * <li>{@code Map<String, Object> fooMap =
    065 *   new DynaBeanPropertyMapDecorator(fooDynaBean, false);}</li>
    066 * </ul>
    067 *
    068 * <h2>Limitations</h2>
    069 * <p>
    070 * In this implementation the {@code entrySet()</code>, <code>keySet()}
    071 *    and {@code values()} methods create an <strong><em>unmodifiable</em></strong>
    072 *    {@code Set</code> and it does not support the Map's <code>clear()} and {@code remove()} operations.
    073 * </p>
    074 *
    075 * @since 1.9.0
    076 */
    077public class DynaBeanPropertyMapDecorator extends BaseDynaBeanMapDecorator<String> {
    078
    079    /**
    080     * Constructs a read only Map for the specified {@link DynaBean}.
    081     *
    082     * @param dynaBean The dyna bean being decorated
    083     * @throws IllegalArgumentException if the {@link DynaBean} is null.
    084     */
    085    public DynaBeanPropertyMapDecorator(final DynaBean dynaBean) {
    086        super(dynaBean);
    087    }
    088
    089    /**
    090     * Constructs a Map for the specified {@link DynaBean}.
    091     *
    092     * @param dynaBean The dyna bean being decorated
    093     * @param readOnly {@code true} if the Map is read only otherwise {@code false}
    094     * @throws IllegalArgumentException if the {@link DynaBean} is null.
    095     */
    096    public DynaBeanPropertyMapDecorator(final DynaBean dynaBean, final boolean readOnly) {
    097        super(dynaBean, readOnly);
    098    }
    099
    100    @Override
    101    protected String convertKey(final String propertyName) {
    102        return propertyName;
    103    }
    104}