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org.apache.commons.jelly.tags.jsl.StyleTag	85%	96%

1		/*
2		* Copyright 2002,2004 The Apache Software Foundation.
3		*
4		* Licensed under the Apache License, Version 2.0 (the "License");
5		* you may not use this file except in compliance with the License.
6		* You may obtain a copy of the License at
7		*
8		* http://www.apache.org/licenses/LICENSE-2.0
9		*
10		* Unless required by applicable law or agreed to in writing, software
11		* distributed under the License is distributed on an "AS IS" BASIS,
12		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13		* See the License for the specific language governing permissions and
14		* limitations under the License.
15		*/
16		package org.apache.commons.jelly.tags.jsl;
17
18		import org.apache.commons.jelly.JellyTagException;
19		import org.apache.commons.jelly.MissingAttributeException;
20		import org.apache.commons.jelly.XMLOutput;
21		import org.apache.commons.jelly.xpath.XPathTagSupport;
22		import org.apache.commons.logging.Log;
23		import org.apache.commons.logging.LogFactory;
24		import org.dom4j.rule.Stylesheet;
25		import org.jaxen.JaxenException;
26		import org.jaxen.XPath;
27
28		/**
29		* This tag performs a JSL stylesheet which was previously
30		* created via an <stylesheet> tag.
31		*
32		* @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
33		* @version $Revision: 155420 $
34		*/
35		public class StyleTag extends XPathTagSupport {
36
37		/** The Log to which logging calls will be made. */
38	18	private Log log = LogFactory.getLog(StyleTag.class);
39
40
41		/** Holds the stylesheet which will be applied to the source context. */
42		private Stylesheet stylesheet;
43
44		/** The XPath expression to evaluate. */
45		private XPath select;
46
47	15	public StyleTag() {
48	15	}
49
50		// Tag interface
51		//-------------------------------------------------------------------------
52		public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException {
53	18	Stylesheet stylesheet = getStylesheet();
54	18	if (stylesheet == null) {
55	0	throw new MissingAttributeException("stylesheet");
56		}
57
58	18	if (stylesheet instanceof JellyStylesheet) {
59	18	JellyStylesheet jellyStyle = (JellyStylesheet) stylesheet;
60	18	jellyStyle.setOutput(output);
61		}
62
63		// dom4j only seems to throw Exception
64		try {
65	18	Object source = getSource();
66	18	if (log.isDebugEnabled()) {
67	0	log.debug("About to evaluate stylesheet on source: " + source);
68		}
69
70	18	stylesheet.run(source);
71	0	} catch (Exception e) {
72	0	throw new JellyTagException(e);
73	18	}
74	18	}
75
76
77		// Properties
78		//-------------------------------------------------------------------------
79
80		public Stylesheet getStylesheet() {
81	18	return stylesheet;
82		}
83
84		/**
85		* Sets the stylesheet to use to style this tags body
86		*/
87		public void setStylesheet(Stylesheet stylesheet) {
88	18	this.stylesheet = stylesheet;
89	18	}
90
91		/** Sets the XPath expression to evaluate. */
92		public void setSelect(XPath select) {
93	12	this.select = select;
94	12	}
95
96		// Implementation methods
97		//-------------------------------------------------------------------------
98
99		/** @return the source on which the stylesheet should run
100		*/
101		protected Object getSource() throws JaxenException {
102	18	Object source = getXPathContext();
103	18	if ( select != null ) {
104	12	return select.evaluate(source);
105		}
106	6	return source;
107		}
108		}

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