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1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/xml/XMLTagLibrary.java,v 1.10 2002/07/20 08:12:04 jstrachan Exp $ 3 * $Revision: 1.10 $ 4 * $Date: 2002/07/20 08:12:04 $ 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: XMLTagLibrary.java,v 1.10 2002/07/20 08:12:04 jstrachan Exp $ 61 */ 62 package org.apache.commons.jelly.tags.xml; 63 64 import org.apache.commons.jelly.JellyException; 65 import org.apache.commons.jelly.TagLibrary; 66 import org.apache.commons.jelly.expression.Expression; 67 import org.apache.commons.jelly.expression.ExpressionFactory; 68 69 import org.apache.commons.logging.Log; 70 import org.apache.commons.logging.LogFactory; 71 72 import org.jaxen.JaxenException; 73 import org.jaxen.XPath; 74 import org.jaxen.dom4j.Dom4jXPath; 75 76 /*** Describes the Taglib. This class could be generated by XDoclet 77 * 78 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 79 * @version $Revision: 1.10 $ 80 */ 81 public class XMLTagLibrary extends TagLibrary { 82 83 /*** The Log to which logging calls will be made. */ 84 private Log log = LogFactory.getLog(XMLTagLibrary.class); 85 86 public XMLTagLibrary() { 87 registerTag("out", ExprTag.class); 88 registerTag("if", IfTag.class); 89 registerTag("forEach", ForEachTag.class); 90 registerTag("parse", ParseTag.class); 91 registerTag("set", SetTag.class); 92 93 // extensions to JSTL 94 registerTag("expr", ExprTag.class); 95 registerTag("element", ElementTag.class); 96 registerTag("attribute", AttributeTag.class); 97 registerTag("copy", CopyTag.class); 98 registerTag("copyOf", CopyOfTag.class); 99 } 100 101 public Expression createExpression( 102 ExpressionFactory factory, 103 String tagName, 104 String attributeName, 105 String attributeValue) throws Exception { 106 107 // #### may need to include some namespace URI information in the XPath instance? 108 109 if (attributeName.equals("select")) { 110 if ( log.isDebugEnabled() ) { 111 log.debug( "Parsing XPath expression: " + attributeValue ); 112 } 113 114 try { 115 XPath xpath = new Dom4jXPath(attributeValue); 116 return new XPathExpression(xpath); 117 } 118 catch (JaxenException e) { 119 throw new JellyException( "Could not parse XPath expression: \"" + attributeValue + "\" reason: " + e, e ); 120 } 121 } 122 123 // will use the default expression instead 124 return super.createExpression(factory, tagName, attributeName, attributeValue); 125 } 126 }

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