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1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/MapTagSupport.java,v 1.3 2002/05/17 15:18:12 jstrachan Exp $ 3 * $Revision: 1.3 $ 4 * $Date: 2002/05/17 15:18:12 $ 5 * 6 * ==================================================================== 7 * 8 * The Apache Software License, Version 1.1 9 * 10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights 11 * reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in 22 * the documentation and/or other materials provided with the 23 * distribution. 24 * 25 * 3. The end-user documentation included with the redistribution, if 26 * any, must include the following acknowlegement: 27 * "This product includes software developed by the 28 * Apache Software Foundation (http://www.apache.org/)." 29 * Alternately, this acknowlegement may appear in the software itself, 30 * if and wherever such third-party acknowlegements normally appear. 31 * 32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software 33 * Foundation" must not be used to endorse or promote products derived 34 * from this software without prior written permission. For written 35 * permission, please contact apache@apache.org. 36 * 37 * 5. Products derived from this software may not be called "Apache" 38 * nor may "Apache" appear in their names without prior written 39 * permission of the Apache Group. 40 * 41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 * ==================================================================== 54 * 55 * This software consists of voluntary contributions made by many 56 * individuals on behalf of the Apache Software Foundation. For more 57 * information on the Apache Software Foundation, please see 58 * <http://www.apache.org/>;. 59 * 60 * $Id: MapTagSupport.java,v 1.3 2002/05/17 15:18:12 jstrachan Exp $ 61 */ 62 63 package org.apache.commons.jelly; 64 65 import java.util.HashMap; 66 67 import java.util.Map; 68 69 /*** 70 * <p><code>MapTag</code> is a DynaTag implementation which uses a Map 71 * to store its attribute values in. Derived tags can then process this 72 * Map, change values, add or remove attributes or perform some other form 73 * of processsing pretty easily. 74 * </p> 75 * 76 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 77 * @version $Revision: 1.3 $ 78 */ 79 80 public abstract class MapTagSupport extends TagSupport implements DynaTag { 81 82 private Map map; 83 84 /*** Sets an attribute value of this tag before the tag is invoked 85 */ 86 public void setAttribute(String name, Object value) { 87 getAttributes().put(name, value); 88 } 89 90 /*** 91 * Helper method which allows derived tags to access the attributes 92 * associated with this tag 93 */ 94 protected Map getAttributes() { 95 if (map == null) { 96 map = createAttributes(); 97 } 98 return map; 99 } 100 /*** 101 * A Factory Method which allows derived tags to overload the Map 102 * implementation used by this tag 103 */ 104 105 protected Map createAttributes() { 106 return new HashMap(); 107 } 108 109 }

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