1 package org.codehaus.classworlds;
2
3 /*
4 $Id: RealmClassLoader.java,v 1.3 2003/09/23 14:09:46 jvanzyl Exp $
5
6 Copyright 2002 (C) The Werken Company. All Rights Reserved.
7
8 Redistribution and use of this software and associated documentation
9 ("Software"), with or without modification, are permitted provided
10 that the following conditions are met:
11
12 1. Redistributions of source code must retain copyright
13 statements and notices. Redistributions must also contain a
14 copy of this document.
15
16 2. Redistributions in binary form must reproduce the
17 above copyright notice, this list of conditions and the
18 following disclaimer in the documentation and/or other
19 materials provided with the distribution.
20
21 3. The name "classworlds" must not be used to endorse or promote
22 products derived from this Software without prior written
23 permission of The Werken Company. For written permission,
24 please contact bob@werken.com.
25
26 4. Products derived from this Software may not be called "classworlds"
27 nor may "classworlds" appear in their names without prior written
28 permission of The Werken Company. "classworlds" is a registered
29 trademark of The Werken Company.
30
31 5. Due credit should be given to The Werken Company.
32 (http://classworlds.werken.com/).
33
34 THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS
35 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
36 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
37 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
38 THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
39 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
40 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
41 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
42 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
43 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
44 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
45 OF THE POSSIBILITY OF SUCH DAMAGE.
46
47 */
48
49 import java.net.URL;
50 import java.net.URLClassLoader;
51 import java.net.MalformedURLException;
52
53 /*** Classloader for <code>ClassRealm</code>s.
54 *
55 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
56 *
57 * @version $Id: RealmClassLoader.java,v 1.3 2003/09/23 14:09:46 jvanzyl Exp $
58 */
59 class RealmClassLoader
60 extends URLClassLoader
61 {
62 // ------------------------------------------------------------
63 // Instance members
64 // ------------------------------------------------------------
65
66 /*** The realm. */
67 protected DefaultClassRealm realm;
68
69 // ------------------------------------------------------------
70 // Constructors
71 // ------------------------------------------------------------
72
73 /*** Construct.
74 *
75 * @param realm The realm for which this loads.
76 */
77 RealmClassLoader(DefaultClassRealm realm)
78 {
79 super( new URL[0] );
80 this.realm = realm;
81 }
82
83 // ------------------------------------------------------------
84 // Instance methods
85 // ------------------------------------------------------------
86
87 /*** Retrieve the realm.
88 *
89 * @return The realm.
90 */
91 DefaultClassRealm getRealm()
92 {
93 return this.realm;
94 }
95
96 /*** Add a constituent to this realm for locating classes.
97 *
98 * @param constituent URL to contituent jar or directory.
99 */
100 void addConstituent(URL constituent)
101 {
102 String urlStr = constituent.toExternalForm();
103
104 if ( urlStr.startsWith( "jar:" )
105 &&
106 urlStr.endsWith( "!/" ) )
107 {
108 urlStr = urlStr.substring( 4,
109 urlStr.length() - 2 );
110
111 try
112 {
113 constituent = new URL( urlStr );
114 }
115 catch (MalformedURLException e)
116 {
117 e.printStackTrace();
118 }
119 }
120
121 addURL( constituent );
122 }
123
124 /*** Load a class directly from this classloader without
125 * defering through any other <code>ClassRealm</code>.
126 *
127 * @param name The name of the class to load.
128 *
129 * @return The loaded class.
130 *
131 * @throws ClassNotFoundException If the class could not be found.
132 */
133 Class loadClassDirect(String name) throws ClassNotFoundException
134 {
135 return super.loadClass( name, true );
136 }
137
138 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
139 // java.lang.ClassLoader
140 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
141
142 /*** Load a class.
143 *
144 * @param name The name of the class to load.
145 * @param resolve If <code>true</code> then resolve the class.
146 *
147 * @return The loaded class.
148 *
149 * @throws ClassNotFoundException If the class cannot be found.
150 */
151 protected Class loadClass(String name,
152 boolean resolve) throws ClassNotFoundException
153 {
154 return getRealm().loadClass( name );
155 }
156
157 /*** Retrieve the <code>URL</code>s used by this <code>ClassLoader</code>.
158 *
159 * @return The urls.
160 */
161 public URL[] getURLs()
162 {
163 return super.getURLs();
164 }
165
166 public URL findResource( String name )
167 {
168 return super.findResource( name );
169 }
170 }
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