001 /*
002 * $Id: ReflectorLoader.java 4542 2006-12-21 19:01:02Z blackdrag $
003 *
004 * Copyright 2003 (C) Jochen Theodorou. All Rights Reserved.
005 *
006 * Redistribution and use of this software and associated documentation
007 * ("Software"), with or without modification, are permitted provided that the
008 * following conditions are met: 1. Redistributions of source code must retain
009 * copyright statements and notices. Redistributions must also contain a copy
010 * of this document. 2. Redistributions in binary form must reproduce the above
011 * copyright notice, this list of conditions and the following disclaimer in
012 * the documentation and/or other materials provided with the distribution. 3.
013 * The name "groovy" must not be used to endorse or promote products derived
014 * from this Software without prior written permission of The Codehaus. For
015 * written permission, please contact info@codehaus.org. 4. Products derived
016 * from this Software may not be called "groovy" nor may "groovy" appear in
017 * their names without prior written permission of The Codehaus. "groovy" is a
018 * registered trademark of The Codehaus. 5. Due credit should be given to The
019 * Codehaus - http://groovy.codehaus.org/
020 *
021 * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
022 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
023 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
024 * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
025 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
026 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
027 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
028 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
029 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
030 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
031 * DAMAGE.
032 *
033 */
034 package org.codehaus.groovy.runtime;
035
036 import java.security.ProtectionDomain;
037 import java.util.HashMap;
038
039 /**
040 * Reflector creation helper. This class is used to define the Refloctor classes.
041 * For each ClassLoader such a Loader will be created by the MetaClass.
042 * The only special about this loader is, that it knows the class Reflector,
043 * which is the base class of all runtime created Reflectors.
044 *
045 * @author <a href="mailto:blackdrag@gmx.org">Jochen Theodorou</a>
046 * @version $Revision: 4542 $
047 */
048 public class ReflectorLoader extends ClassLoader {
049 private HashMap loadedClasses = new HashMap();
050
051 /**
052 * returns the Reflector class.
053 *
054 * @return the Reflector class if the name matches
055 * @throws ClassNotFoundException if the name is not matching Reflector
056 * @see Reflector
057 */
058 protected Class findClass(String name) throws ClassNotFoundException {
059 if (delegatationLoader==null) return super.loadClass(name);
060 return delegatationLoader.loadClass(name);
061 }
062
063 /**
064 * helper method to define Reflector classes
065 * @param name of the Reflector
066 * @param bytecode the bytecode
067 * @param domain the protection domain
068 * @return the generated class
069 */
070 public Class defineClass(String name, byte[] bytecode, ProtectionDomain domain) {
071 Class c = defineClass(name, bytecode, 0, bytecode.length, domain);
072 synchronized(loadedClasses) { loadedClasses.put(name,c); }
073 resolveClass(c);
074 return c;
075 }
076
077 /**
078 * creates a RelfectorLoader.
079 * @param parent the parent loader. This should never be null!
080 */
081 public ReflectorLoader(ClassLoader parent) {
082 super(parent);
083 delegatationLoader = getClass().getClassLoader();
084 }
085
086 public Class getLoadedClass(String name) {
087 synchronized (loadedClasses) {
088 return (Class)loadedClasses.get(name);
089 }
090 }
091
092 private ClassLoader delegatationLoader;
093 }