This provides a convenient Map wrapper (such as for cases where Collections.synchronizedMap() just won't do). It was reviewed by Leonard Richardson <[EMAIL PROTECTED]>.
- Dan /* * $Header: $ * $Revision: $ * $Date: $ * * ==================================================================== * * The Apache Software License, Version 1.1 * * Copyright (c) 1999-2002 The Apache Software Foundation. All rights * reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, if * any, must include the following acknowlegement: * "This product includes software developed by the * Apache Software Foundation (http://www.apache.org/)." * Alternately, this acknowlegement may appear in the software itself, * if and wherever such third-party acknowlegements normally appear. * * 4. The names "The Jakarta Project", "Commons", and "Apache Software * Foundation" must not be used to endorse or promote products derived * from this software without prior written permission. For written * permission, please contact [EMAIL PROTECTED] * * 5. Products derived from this software may not be called "Apache" * nor may "Apache" appear in their names without prior written * permission of the Apache Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */ package org.apache.commons.collections; import java.util.Collection; import java.util.Map; import java.util.Set; /** * <p>delegate - a person authorized to act as representative for * another</p> * * <p>This <code>Map</code> wraps another <code>Map</code> * implementation, using the wrapped instance for its default * implementation. This class is used as a framework on which to * build to extensions for its wrapped <code>Map</code> object which * would be unavailable or inconvenient via sub-classing (but usable * via composition).</p> * * <p>An example use case is where the wrapped <code>Map</code> needs * synchronization (to make it thread-safe), but the <code>Map</code> * returned by <code>Collections.synchronizedMap(map)</code> * hides part of <code>map</code>'s public interface.</p> * * @author <a href="mailto:[EMAIL PROTECTED]">Daniel Rall</a> * @since 2.0 */ public abstract class DelegateMap implements Map { /** * The <code>Map</code> used for default implementations. */ protected Map map; /** * Creates a new instance acting as a representative for the * specified <code>Map</code>. * * @param map The <code>Map</code> to whose operations to wrap. */ public DelegateMap(Map map) { this.map = map; } public void clear() { map.clear(); } public boolean containsKey(Object key) { return map.containsKey(key); } public boolean containsValue(Object value) { return map.containsValue(value); } public Set entrySet() { return map.entrySet(); } public boolean equals(Object map) { return map.equals(map); } public Object get(Object key) { return map.get(key); } public int hashCode() { return map.hashCode(); } public boolean isEmpty() { return map.isEmpty(); } public Set keySet() { return map.keySet(); } public Object put(Object key, Object value) { return map.put(key, value); } public void putAll(Map t) { map.putAll(t); } public Object remove(Object key) { return map.remove(key); } public int size() { return map.size(); } public Collection values() { return map.values(); } } -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>