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    1   package org.apache.bcel.util;
    2
    3   /* ====================================================================
    4    * The Apache Software License, Version 1.1
    5    *
    6    * Copyright (c) 2001 The Apache Software Foundation.  All rights
    7    * reserved.
    8    *
    9    * Redistribution and use in source and binary forms, with or without
    10   * modification, are permitted provided that the following conditions
    11   * are met:
    12   *
    13   * 1. Redistributions of source code must retain the above copyright
    14   *    notice, this list of conditions and the following disclaimer.
    15   *
    16   * 2. Redistributions in binary form must reproduce the above copyright
    17   *    notice, this list of conditions and the following disclaimer in
    18   *    the documentation and/or other materials provided with the
    19   *    distribution.
    20   *
    21   * 3. The end-user documentation included with the redistribution,
    22   *    if any, must include the following acknowledgment:
    23   *       "This product includes software developed by the
    24   *        Apache Software Foundation (http://www.apache.org/)."
    25   *    Alternately, this acknowledgment may appear in the software itself,
    26   *    if and wherever such third-party acknowledgments normally appear.
    27   *
    28   * 4. The names "Apache" and "Apache Software Foundation" and
    29   *    "Apache BCEL" must not be used to endorse or promote products
    30   *    derived from this software without prior written permission. For
    31   *    written permission, please contact apache@apache.org.
    32   *
    33   * 5. Products derived from this software may not be called "Apache",
    34   *    "Apache BCEL", nor may "Apache" appear in their name, without
    35   *    prior written permission of the Apache Software Foundation.
    36   *
    37   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
    38   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    39   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    40   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
    41   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    42   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    43   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
    44   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    45   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    46   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
    47   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    48   * SUCH DAMAGE.
    49   * ====================================================================
    50   *
    51   * This software consists of voluntary contributions made by many
    52   * individuals on behalf of the Apache Software Foundation.  For more
    53   * information on the Apache Software Foundation, please see
    54   * <http://www.apache.org/>;.
    55   */
    56
    57  import java.io.*;
    58
    59  import java.util.Map;
    60  import java.util.HashMap;
    61
    62  import org.apache.bcel.classfile.*;
    63
    64  /***
    65   * The repository maintains information about which classes have
    66   * been loaded.
    67   *
    68   * It loads its data from the ClassLoader implementation
    69   * passed into its constructor.
    70   *
    71   * @see org.apache.bcel.Repository
    72   *
    73   * @version $Id: ClassLoaderRepository.java,v 1.4 2002/10/11 20:34:47 mdahm Exp $
    74   * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
    75   * @author David Dixon-Peugh
    76   */
    77  public class ClassLoaderRepository
    78    implements Repository
    79  {
    80    private java.lang.ClassLoader loader;
    81    private HashMap loadedClasses =
    82      new HashMap(); // CLASSNAME X JAVACLASS
    83
    84    public ClassLoaderRepository( java.lang.ClassLoader loader ) {
    85      this.loader = loader;
    86    }
    87
    88    /***
    89     * Store a new JavaClass into this Repository.
    90     */
    91    public void storeClass( JavaClass clazz ) {
    92      loadedClasses.put( clazz.getClassName(),
    93  		       clazz );
    94      clazz.setRepository( this );
    95    }
    96
    97    /***
    98     * Remove class from repository
    99     */
    100   public void removeClass(JavaClass clazz) {
    101     loadedClasses.remove(clazz.getClassName());
    102   }
    103
    104   /***
    105    * Find an already defined JavaClass.
    106    */
    107   public JavaClass findClass( String className ) {
    108     if ( loadedClasses.containsKey( className )) {
    109       return (JavaClass) loadedClasses.get( className );
    110     } else {
    111       return null;
    112     }
    113   }
    114
    115   /***
    116    * Lookup a JavaClass object from the Class Name provided.
    117    */
    118   public JavaClass loadClass( String className )
    119     throws ClassNotFoundException
    120   {
    121     String classFile = className.replace('.', '/');
    122
    123     JavaClass RC = findClass( className );
    124     if (RC != null) { return RC; }
    125
    126     try {
    127       InputStream is =
    128 	loader.getResourceAsStream( classFile + ".class" );
    129
    130       if(is == null) {
    131 	throw new ClassNotFoundException(className + " not found.");
    132       }
    133
    134       ClassParser parser = new ClassParser( is, className );
    135       RC = parser.parse();
    136
    137       storeClass( RC );
    138
    139       return RC;
    140     } catch (IOException e) {
    141       throw new ClassNotFoundException( e.toString() );
    142     }
    143   }
    144
    145   public JavaClass loadClass(Class clazz) throws ClassNotFoundException {
    146     return loadClass(clazz.getName());
    147   }
    148
    149   /*** Clear all entries from cache.
    150    */
    151   public void clear() {
    152     loadedClasses.clear();
    153   }
    154 }
    155

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