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1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/xml/XMLTagLibrary.java,v 1.6 2002/05/17 18:04:00 jstrachan Exp $ 3 * $Revision: 1.6 $ 4 * $Date: 2002/05/17 18:04:00 $ 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 1.6 2002/05/17 18:04:00 jstrachan Exp $ 61 */ 62 package org.apache.commons.jelly.tags.jsl; 63 64 import java.io.IOException; 65 import java.io.Writer; 66 import java.util.Iterator; 67 import java.util.List; 68 69 import org.apache.commons.jelly.JellyContext; 70 import org.apache.commons.jelly.JellyException; 71 import org.apache.commons.jelly.Script; 72 import org.apache.commons.jelly.expression.Expression; 73 import org.apache.commons.jelly.expression.ExpressionFactory; 74 import org.apache.commons.jelly.tags.xml.ExprTag; 75 import org.apache.commons.jelly.tags.xml.XMLTagLibrary; 76 import org.apache.commons.jelly.tags.xml.XPathExpression; 77 78 import org.apache.commons.logging.Log; 79 import org.apache.commons.logging.LogFactory; 80 81 import org.dom4j.DocumentHelper; 82 import org.dom4j.rule.Pattern; 83 84 import org.jaxen.JaxenException; 85 import org.jaxen.XPath; 86 import org.jaxen.dom4j.Dom4jXPath; 87 88 /*** Describes the Taglib. This class could be generated by XDoclet 89 * 90 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 91 * @version $Revision: 1.6 $ 92 */ 93 public class JSLTagLibrary extends XMLTagLibrary { 94 95 /*** The Log to which logging calls will be made. */ 96 private Log log = LogFactory.getLog(JSLTagLibrary.class); 97 98 public JSLTagLibrary() { 99 registerTag("stylesheet", StylesheetTag.class); 100 registerTag("style", StyleTag.class); 101 registerTag("template", TemplateTag.class); 102 registerTag("applyTemplates", ApplyTemplatesTag.class); 103 registerTag("valueOf", ExprTag.class); 104 } 105 106 public Expression createExpression( 107 ExpressionFactory factory, 108 String tagName, 109 String attributeName, 110 String attributeValue) throws Exception { 111 112 // #### may need to include some namespace URI information in the XPath instance? 113 114 if (attributeName.equals("select")) { 115 if ( log.isDebugEnabled() ) { 116 log.debug( "Parsing XPath expression: " + attributeValue ); 117 } 118 119 try { 120 XPath xpath = new Dom4jXPath(attributeValue); 121 return new XPathExpression(xpath); 122 } 123 catch (JaxenException e) { 124 throw new JellyException( "Could not parse XPath expression: \"" + attributeValue + "\" reason: " + e, e ); 125 } 126 } 127 128 if (attributeName.equals("match")) { 129 if ( log.isDebugEnabled() ) { 130 log.debug( "Parsing XPath pattern: " + attributeValue ); 131 } 132 133 try { 134 Pattern pattern = DocumentHelper.createPattern( attributeValue ); 135 return new XPathPatternExpression(pattern); 136 } 137 catch (Exception e) { 138 throw new JellyException( "Could not parse XPath expression: \"" + attributeValue + "\" reason: " + e, e ); 139 } 140 } 141 142 // will use the default expression instead 143 return super.createExpression(factory, tagName, attributeName, attributeValue); 144 } 145 146 147 }

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