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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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