1 /*
2 *
3 * ====================================================================
4 *
5 * The Apache Software License, Version 1.1
6 *
7 * Copyright (c) 1999 The Apache Software Foundation. All rights
8 * reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 *
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in
19 * the documentation and/or other materials provided with the
20 * distribution.
21 *
22 * 3. The end-user documentation included with the redistribution, if
23 * any, must include the following acknowlegement:
24 * "This product includes software developed by the
25 * Apache Software Foundation (http://www.apache.org/)."
26 * Alternately, this acknowlegement may appear in the software itself,
27 * if and wherever such third-party acknowlegements normally appear.
28 *
29 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
30 * Foundation" must not be used to endorse or promote products derived
31 * from this software without prior written permission. For written
32 * permission, please contact apache@apache.org.
33 *
34 * 5. Products derived from this software may not be called "Apache"
35 * nor may "Apache" appear in their names without prior written
36 * permission of the Apache Group.
37 *
38 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
39 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
40 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
41 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
44 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
45 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
46 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
47 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
48 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
49 * SUCH DAMAGE.
50 * ====================================================================
51 *
52 * This software consists of voluntary contributions made by many
53 * individuals on behalf of the Apache Software Foundation. For more
54 * information on the Apache Software Foundation, please see
55 * <http://www.apache.org/>.
56 *
57 */
58 package org.apache.commons.jelly.tags.jsl;
59
60 import org.apache.commons.jelly.JellyContext;
61 import org.apache.commons.jelly.MissingAttributeException;
62 import org.apache.commons.jelly.XMLOutput;
63 import org.apache.commons.jelly.tags.xml.XPathTagSupport;
64
65 import org.apache.commons.logging.Log;
66 import org.apache.commons.logging.LogFactory;
67
68 import org.dom4j.rule.Stylesheet;
69
70 import org.jaxen.XPath;
71
72 /***
73 * This tag performs a JSL stylesheet which was previously
74 * created via an <stylesheet> tag.
75 *
76 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
77 * @version $Revision: 1.8 $
78 */
79 public class StyleTag extends XPathTagSupport {
80
81 /*** The Log to which logging calls will be made. */
82 private Log log = LogFactory.getLog(StyleTag.class);
83
84
85 /*** Holds the stylesheet which will be applied to the source context. */
86 private Stylesheet stylesheet;
87
88 /*** The XPath expression to evaluate. */
89 private XPath select;
90
91 public StyleTag() {
92 }
93
94 // Tag interface
95 //-------------------------------------------------------------------------
96 public void doTag(XMLOutput output) throws Exception {
97 Stylesheet stylesheet = getStylesheet();
98 if (stylesheet == null) {
99 throw new MissingAttributeException("stylesheet");
100 }
101
102 Object source = getSource();
103 if (log.isDebugEnabled()) {
104 log.debug("About to evaluate stylesheet on source: " + source);
105 }
106
107 stylesheet.run(source);
108 }
109
110
111 // Properties
112 //-------------------------------------------------------------------------
113
114 public Stylesheet getStylesheet() {
115 return stylesheet;
116 }
117
118 /***
119 * Sets the stylesheet to use to style this tags body
120 */
121 public void setStylesheet(Stylesheet stylesheet) {
122 this.stylesheet = stylesheet;
123 }
124
125 /*** Sets the XPath expression to evaluate. */
126 public void setSelect(XPath select) {
127 this.select = select;
128 }
129
130 // Implementation methods
131 //-------------------------------------------------------------------------
132
133 /*** @return the source on which the stylesheet should run
134 */
135 protected Object getSource() throws Exception {
136 Object source = getXPathContext();
137 if ( select != null ) {
138 return select.evaluate(source);
139 }
140 return source;
141 }
142 }
This page was automatically generated by Maven