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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