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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 }