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1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/define/DynamicTag.java,v 1.10 2002/07/10 21:46:18 jvanzyl Exp $ 3 * $Revision: 1.10 $ 4 * $Date: 2002/07/10 21:46:18 $ 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: DynamicTag.java,v 1.10 2002/07/10 21:46:18 jvanzyl Exp $ 61 */ 62 package org.apache.commons.jelly.impl; 63 64 import java.util.HashMap; 65 import java.util.Map; 66 67 import org.apache.commons.jelly.JellyContext; 68 import org.apache.commons.jelly.DynaTag; 69 import org.apache.commons.jelly.Script; 70 import org.apache.commons.jelly.TagSupport; 71 import org.apache.commons.jelly.XMLOutput; 72 73 import org.apache.commons.logging.Log; 74 import org.apache.commons.logging.LogFactory; 75 76 /*** 77 * <p><code>DynamicTag</code> is a tag that is created from 78 * inside a Jelly script as a Jelly template and will invoke a 79 * given script, passing in its instantiation attributes 80 * as variables and will allow the template to invoke its instance body.</p> 81 * 82 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 83 * @version $Revision: 1.10 $ 84 */ 85 public class DynamicTag extends TagSupport implements DynaTag { 86 87 /*** The Log to which logging calls will be made. */ 88 private static final Log log = LogFactory.getLog(DynamicTag.class); 89 90 /*** The template script */ 91 private Script template; 92 93 /*** The instance attributes */ 94 private Map attributes = new HashMap(); 95 96 public DynamicTag() { 97 } 98 99 public DynamicTag(Script template) { 100 this.template = template; 101 } 102 103 104 // Tag interface 105 //------------------------------------------------------------------------- 106 public void doTag(XMLOutput output) throws Exception { 107 if ( log.isDebugEnabled() ) { 108 log.debug("Invoking dynamic tag with attributes: " + attributes); 109 } 110 attributes.put("org.apache.commons.jelly.body", getBody()); 111 112 // create new context based on current attributes 113 JellyContext newJellyContext = context.newJellyContext(attributes); 114 getTemplate().run(newJellyContext, output); 115 } 116 117 // DynaTag interface 118 //------------------------------------------------------------------------- 119 public void setAttribute(String name, Object value) { 120 attributes.put(name, value); 121 } 122 123 // Properties 124 //------------------------------------------------------------------------- 125 /*** The template to be executed by this tag which may well 126 * invoke this instances body from inside the template 127 */ 128 public Script getTemplate() { 129 return template; 130 } 131 132 public void setTemplate(Script template) { 133 this.template = template; 134 } 135 }

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