1 package org.codehaus.classworlds;
2
3 /*
4 $Id: ClassWorld.java,v 1.2 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.util.Map;
50 import java.util.HashMap;
51 import java.util.Collection;
52
53 /*** A collection of <code>ClassRealm</code>s, indexed by id.
54 *
55 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a>
56 *
57 * @version $Id: ClassWorld.java,v 1.2 2003/09/23 14:09:46 jvanzyl Exp $
58 */
59 public class ClassWorld
60 {
61 // ------------------------------------------------------------
62 // Instance members
63 // ------------------------------------------------------------
64
65 /*** Realms, indexed by id. */
66 private Map realms;
67
68 // ------------------------------------------------------------
69 // Constructors
70 // ------------------------------------------------------------
71
72 /*** Construct.
73 */
74 public ClassWorld()
75 {
76 this.realms = new HashMap();
77 }
78
79 // ------------------------------------------------------------
80 // Instance methods
81 // ------------------------------------------------------------
82
83 /*** Create a new <code>ClassRealm</code>.
84 *
85 * @param id The realm id.
86 *
87 * @return The newly created realm.
88 *
89 * @throws DuplicateRealmException If this class-world already
90 * contains a realm with the specified id.
91 */
92 public ClassRealm newRealm(String id) throws DuplicateRealmException
93 {
94 if ( this.realms.containsKey( id ) )
95 {
96 throw new DuplicateRealmException( this,
97 id );
98 }
99
100 DefaultClassRealm realm = new DefaultClassRealm( this,
101 id );
102
103 this.realms.put( id,
104 realm );
105
106 return realm;
107 }
108
109 /*** Retrieve a <code>ClassRealm</code> by its id.
110 *
111 * @param id The id.
112 *
113 * @return The matching class-realm.
114 *
115 * @throws NoSuchRealmException If the id does not correspond
116 * to any known class-realm.
117 */
118 public ClassRealm getRealm(String id) throws NoSuchRealmException
119 {
120 if ( this.realms.containsKey( id ) )
121 {
122 return (ClassRealm) this.realms.get( id );
123 }
124
125 throw new NoSuchRealmException( this,
126 id );
127 }
128
129 /*** Retrieve a <code>ClassRealmImpl</code> by its id.
130 *
131 * @param id The id.
132 *
133 * @return The matching class-realm.
134 *
135 * @throws NoSuchRealmException If the id does not correspond
136 * to any known class-realm.
137 */
138 DefaultClassRealm getRealmImpl(String id) throws NoSuchRealmException
139 {
140 return (DefaultClassRealm) getRealm( id );
141 }
142
143 /*** Retrieve the collection of all <code>ClassRealm</code>s
144 * in this world.
145 *
146 * @return The collectio of class-realms.
147 */
148 public Collection getRealms()
149 {
150 return this.realms.values();
151 }
152
153 /*** Load a class.
154 *
155 * @param name The name of the class to load.
156 *
157 * @return The loaded class.
158 *
159 * @throws ClassNotFoundException If the class cannot be found.
160 */
161 Class loadClass(String name) throws ClassNotFoundException
162 {
163 return getClass().getClassLoader().loadClass( name );
164 }
165 }
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