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1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/define/DynamicTagLibrary.java,v 1.6 2002/08/01 09:53:18 jstrachan Exp $ 3 * $Revision: 1.6 $ 4 * $Date: 2002/08/01 09:53:18 $ 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: DynamicTagLibrary.java,v 1.6 2002/08/01 09:53:18 jstrachan 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.DynaTag; 68 import org.apache.commons.jelly.Script; 69 import org.apache.commons.jelly.Tag; 70 import org.apache.commons.jelly.TagLibrary; 71 import org.apache.commons.jelly.impl.DynaTagScript; 72 import org.apache.commons.jelly.impl.TagFactory; 73 import org.apache.commons.jelly.impl.TagScript; 74 75 import org.xml.sax.Attributes; 76 77 /*** 78 * <p><code>DynamicTagLibrary</code> represents a TagLibrary which 79 * gets created by running a Jelly script.</p> 80 * 81 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 82 * @version $Revision: 1.6 $ 83 */ 84 public class DynamicTagLibrary extends TagLibrary { 85 86 private String uri; 87 private Map templates = new HashMap(); 88 private TagLibrary parent; 89 90 public DynamicTagLibrary() { 91 } 92 93 public DynamicTagLibrary(String uri) { 94 this.uri = uri; 95 } 96 97 /*** Creates a new script to execute the given tag name and attributes */ 98 public TagScript createTagScript(final String name, final Attributes attributes) 99 throws Exception { 100 101 return new DynaTagScript( 102 new TagFactory() { 103 public Tag createTag() throws Exception { 104 Tag answer = DynamicTagLibrary.this.createTag(name); 105 106 // delegate to my parent instead 107 if ( answer == null && parent != null ) { 108 return parent.createTag(name, attributes); 109 } 110 return answer; 111 } 112 } 113 ); 114 } 115 116 /*** Creates a new Tag for the given tag name if it exists */ 117 public Tag createTag(String name) 118 throws Exception { 119 120 Object value = templates.get(name); 121 if ( value instanceof Script ) { 122 Script template = (Script) value; 123 return new DynamicTag(template); 124 } 125 else if ( value instanceof TagFactory ) { 126 TagFactory factory = (TagFactory) value; 127 return factory.createTag(); 128 } 129 return null; 130 } 131 132 /*** 133 * Creates a new tag with the given name and template 134 */ 135 public void registerDynamicTag(String name, Script template) { 136 templates.put(name, template); 137 } 138 139 /*** 140 * Creates a new Jelly Bean Tag with the given name 141 */ 142 public void registerBeanTag(String name, TagFactory factory) { 143 templates.put(name, factory); 144 } 145 146 // Properties 147 //------------------------------------------------------------------------- 148 public String getUri() { 149 return uri; 150 } 151 152 public void setUri(String uri) { 153 this.uri = uri; 154 } 155 156 157 /*** 158 * Returns the parent library which will be used to resolve unknown tags. 159 * @return TagLibrary 160 */ 161 public TagLibrary getParent() { 162 return parent; 163 } 164 165 /*** 166 * Sets the parent to inherit tags from that are not defined in this library. 167 * @param parent The parent to set 168 */ 169 public void setParent(TagLibrary parent) { 170 this.parent = parent; 171 } 172 173 }

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