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1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/define/InvokeBodyTag.java,v 1.11 2002/08/09 18:01:01 jstrachan Exp $ 3 * $Revision: 1.11 $ 4 * $Date: 2002/08/09 18:01:01 $ 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: InvokeBodyTag.java,v 1.11 2002/08/09 18:01:01 jstrachan Exp $ 61 */ 62 package org.apache.commons.jelly.tags.define; 63 64 import org.apache.commons.jelly.JellyContext; 65 import org.apache.commons.jelly.JellyException; 66 import org.apache.commons.jelly.Script; 67 import org.apache.commons.jelly.Tag; 68 import org.apache.commons.jelly.TagSupport; 69 import org.apache.commons.jelly.XMLOutput; 70 import org.apache.commons.jelly.impl.DynamicTag; 71 72 import org.apache.commons.logging.Log; 73 import org.apache.commons.logging.LogFactory; 74 75 /*** 76 * <invokeBody> tag is used inside a <tag> tag 77 * (i.e. the definition of a dynamic tag) to invoke the tags body when 78 * the tag is invoked. 79 * 80 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 81 * @version $Revision: 1.11 $ 82 */ 83 public class InvokeBodyTag extends TagSupport { 84 85 /*** The Log to which logging calls will be made. */ 86 private static final Log log = LogFactory.getLog(InvokeBodyTag.class); 87 88 public InvokeBodyTag() { 89 } 90 91 // Tag interface 92 //------------------------------------------------------------------------- 93 public void doTag(XMLOutput output) throws Exception { 94 // Try find find the body from the reserved 'org.apache.commons.jelly.body' variable 95 Script script = (Script) context.getVariable("org.apache.commons.jelly.body"); 96 if (script != null) { 97 script.run(context, output); 98 } 99 else { 100 // note this mechanism does not work properly for arbitrarily 101 // nested dynamic tags. A better way is required. 102 Tag tag = findAncestorWithClass(this, DynamicTag.class); 103 if (tag == null) { 104 throw new JellyException("Cannot invoke body, no dynamic tag is defined in this block"); 105 } 106 else { 107 tag.invokeBody(output); 108 } 109 } 110 } 111 }

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