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    1   /*
    2    * $Id: ReflectorLoader.java 4542 2006-12-21 19:01:02Z blackdrag $
    3    *
    4    * Copyright 2003 (C) Jochen Theodorou. All Rights Reserved.
    5    *
    6    * Redistribution and use of this software and associated documentation
    7    * ("Software"), with or without modification, are permitted provided that the
    8    * following conditions are met: 1. Redistributions of source code must retain
    9    * 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) throws ClassNotFoundException {
    59          if (delegatationLoader==null) return super.loadClass(name);
    60          return delegatationLoader.loadClass(name);
    61      }
    62
    63      /***
    64       * helper method to define Reflector classes
    65       * @param name of the Reflector
    66       * @param bytecode the bytecode
    67       * @param domain  the protection domain
    68       * @return the generated class
    69       */
    70      public Class defineClass(String name, byte[] bytecode, ProtectionDomain domain) {
    71          Class c = defineClass(name, bytecode, 0, bytecode.length, domain);
    72          synchronized(loadedClasses) { loadedClasses.put(name,c); }
    73          resolveClass(c);
    74          return c;
    75      }
    76
    77      /***
    78       * creates a RelfectorLoader.
    79       * @param parent the parent loader. This should never be null!
    80       */
    81      public ReflectorLoader(ClassLoader parent) {
    82          super(parent);
    83          delegatationLoader = getClass().getClassLoader();
    84      }
    85
    86      public Class getLoadedClass(String name) {
    87          synchronized (loadedClasses) {
    88              return (Class)loadedClasses.get(name);
    89          }
    90      }
    91
    92      private ClassLoader delegatationLoader;
    93  }