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org.apache.commons.jelly.tags.define.ClassLoaderTag	4%	88%

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
17		package org.apache.commons.jelly.tags.define;
18
19		import java.net.MalformedURLException;
20		import java.net.URL;
21		import java.net.URLClassLoader;
22
23		import org.apache.commons.jelly.JellyTagException;
24		import org.apache.commons.jelly.MissingAttributeException;
25		import org.apache.commons.jelly.XMLOutput;
26		import org.apache.commons.jelly.util.ClassLoaderUtils;
27		import org.apache.commons.logging.Log;
28		import org.apache.commons.logging.LogFactory;
29
30
31		/**
32		* Creates a new <code>URLClassLoader</code> to dynamically
33		* load tags froms.
34		*
35		* @author <a href="mailto:stephenh@chase3000.com">Stephen Haberman</a>
36		* @version $Revision: 155420 $
37		*/
38	0	public class ClassLoaderTag extends BeanTag {
39
40		/** The Log to which logging calls will be made. */
41	18	private static final Log log = LogFactory.getLog(ClassLoaderTag.class);
42
43		/** The name to export the classloader to. */
44		private String var;
45
46		/** The URL to load the classes from. */
47		private String url;
48
49		// Properties
50		//-------------------------------------------------------------------------
51
52		/**
53		* @return the variable to store the class loader in
54		*/
55		public String getVar() {
56	0	return this.var;
57		}
58
59		/**
60		* @param var the variable to store the class loader in
61		*/
62		public void setVar(String var) {
63	0	this.var = class="keyword">var;
64	0	}
65
66		/**
67		* @return the url to load the classes from
68		*/
69		public String getUrl() {
70	0	return this.url;
71		}
72
73		/**
74		* @param url the url to load the classes from
75		*/
76		public void setUrl(String url) {
77	0	this.url = url;
78	0	}
79
80		// Implementation methods
81		//-------------------------------------------------------------------------
82
83		public void doTag(XMLOutput output) throws MissingAttributeException, JellyTagException {
84	0	if ( getVar() == null ) {
85	0	throw new MissingAttributeException( "var" );
86		}
87	0	if ( getUrl() == null ) {
88	0	throw new MissingAttributeException( "url" );
89		}
90
91	0	ClassLoader parent = Thread.currentThread().getContextClassLoader();
92	0	if (parent == null) {
93	0	parent = ClassLoaderUtils.getClassLoader(getClass());
94		}
95
96	0	URLClassLoader newClassLoader = null;
97
98		try {
99	0	newClassLoader =
100		new URLClassLoader( class="keyword">new URL[] { class="keyword">new URL(getUrl()) }, parent );
101	0	} catch (MalformedURLException e) {
102	0	throw new JellyTagException(e);
103	0	}
104
105	0	log.debug("Storing the new classloader in " + getVar());
106
107	0	context.setVariable(getVar(), newClassLoader);
108	0	}
109
110		}

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