1 package org.codehaus.classworlds;
2
3 /*
4 $Id: ClassWorld.java,v 1.1.1.1 2004/07/01 13:59:17 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.util.Map;
50 import java.util.HashMap;
51 import java.util.Collection;
52
53 /***
54 * A collection of <code>ClassRealm</code>s, indexed by id.
55 *
56 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
57 * @version $Id: ClassWorld.java,v 1.1.1.1 2004/07/01 13:59:17 jvanzyl Exp $
58 */
59 public class ClassWorld
60 {
61 private Map realms;
62
63 public ClassWorld( String realmId, ClassLoader classLoader )
64 {
65 this();
66
67 try
68 {
69 newRealm( realmId, classLoader );
70 }
71 catch ( DuplicateRealmException e )
72 {
73 // Will never happen as we are just creating the world.
74 }
75 }
76
77 public ClassWorld()
78 {
79 this.realms = new HashMap();
80 }
81
82 public ClassRealm newRealm( String id )
83 throws DuplicateRealmException
84 {
85 return newRealm( id, null );
86 }
87
88 public ClassRealm newRealm( String id, ClassLoader classLoader )
89 throws DuplicateRealmException
90 {
91 if ( realms.containsKey( id ) )
92 {
93 throw new DuplicateRealmException( this, id );
94 }
95
96 ClassRealm realm = null;
97
98 if ( classLoader != null )
99 {
100 realm = new DefaultClassRealm( this, id, classLoader );
101
102 realms.put( id, realm );
103 }
104 else
105 {
106 realm = new DefaultClassRealm( this, id );
107 }
108
109 realms.put( id, realm );
110
111 return realm;
112 }
113
114 public void disposeRealm( String id )
115 throws NoSuchRealmException
116 {
117 realms.remove( id );
118 }
119
120 public ClassRealm getRealm( String id )
121 throws NoSuchRealmException
122 {
123 if ( realms.containsKey( id ) )
124 {
125 return (ClassRealm) realms.get( id );
126 }
127
128 throw new NoSuchRealmException( this, id );
129 }
130
131 public Collection getRealms()
132 {
133 return realms.values();
134 }
135
136 Class loadClass( String name )
137 throws ClassNotFoundException
138 {
139 // Use the classloader that was used to load classworlds itself to
140 // load anything classes within org.codehaus.classworlds.*
141
142 return getClass().getClassLoader().loadClass( name );
143 }
144 }