Source Code Cross Referenced for ReflectorLoader.java in  » Scripting » groovy-1.0 » org » codehaus » groovy » runtime » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » groovy 1.0 » org.codehaus.groovy.runtime 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*
02:         * $Id: ReflectorLoader.java 4542 2006-12-21 19:01:02Z blackdrag $
03:         * 
04:         * Copyright 2003 (C) Jochen Theodorou. All Rights Reserved.
05:         * 
06:         * Redistribution and use of this software and associated documentation
07:         * ("Software"), with or without modification, are permitted provided that the
08:         * following conditions are met: 1. Redistributions of source code must retain
09:         * copyright statements and notices. Redistributions must also contain a copy
10:         * of this document. 2. Redistributions in binary form must reproduce the above
11:         * copyright notice, this list of conditions and the following disclaimer in
12:         * the documentation and/or other materials provided with the distribution. 3.
13:         * The name "groovy" must not be used to endorse or promote products derived
14:         * from this Software without prior written permission of The Codehaus. For
15:         * written permission, please contact info@codehaus.org. 4. Products derived
16:         * from this Software may not be called "groovy" nor may "groovy" appear in
17:         * their names without prior written permission of The Codehaus. "groovy" is a
18:         * registered trademark of The Codehaus. 5. Due credit should be given to The
19:         * Codehaus - http://groovy.codehaus.org/
20:         * 
21:         * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
22:         * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23:         * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24:         * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
25:         * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26:         * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
27:         * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
28:         * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29:         * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30:         * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
31:         * DAMAGE.
32:         *  
33:         */
34:        package org.codehaus.groovy.runtime;
35:
36:        import java.security.ProtectionDomain;
37:        import java.util.HashMap;
38:
39:        /**
40:         * Reflector creation helper. This class is used to define the Refloctor classes.
41:         * For each ClassLoader such a Loader will be created by the MetaClass.
42:         * The only special about this loader is, that it knows the class Reflector, 
43:         * which is the base class of all runtime created Reflectors. 
44:         * 
45:         * @author <a href="mailto:blackdrag@gmx.org">Jochen Theodorou</a>
46:         * @version $Revision: 4542 $
47:         */
48:        public class ReflectorLoader extends ClassLoader {
49:            private HashMap loadedClasses = new HashMap();
50:
51:            /**
52:             * returns the Reflector class.
53:             * 
54:             * @return the Reflector class if the name matches
55:             * @throws ClassNotFoundException if the name is not matching Reflector
56:             * @see Reflector
57:             */
58:            protected Class findClass(String name)
59:                    throws ClassNotFoundException {
60:                if (delegatationLoader == null)
61:                    return super .loadClass(name);
62:                return delegatationLoader.loadClass(name);
63:            }
64:
65:            /**
66:             * helper method to define Reflector classes
67:             * @param name of the Reflector
68:             * @param bytecode the bytecode
69:             * @param domain  the protection domain
70:             * @return the generated class
71:             */
72:            public Class defineClass(String name, byte[] bytecode,
73:                    ProtectionDomain domain) {
74:                Class c = defineClass(name, bytecode, 0, bytecode.length,
75:                        domain);
76:                synchronized (loadedClasses) {
77:                    loadedClasses.put(name, c);
78:                }
79:                resolveClass(c);
80:                return c;
81:            }
82:
83:            /**
84:             * creates a RelfectorLoader. 
85:             * @param parent the parent loader. This should never be null!
86:             */
87:            public ReflectorLoader(ClassLoader parent) {
88:                super (parent);
89:                delegatationLoader = getClass().getClassLoader();
90:            }
91:
92:            public Class getLoadedClass(String name) {
93:                synchronized (loadedClasses) {
94:                    return (Class) loadedClasses.get(name);
95:                }
96:            }
97:
98:            private ClassLoader delegatationLoader;
99:        }
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