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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   * This repository is used in situations where a Class is created
    66   * outside the realm of a ClassLoader. Classes are loaded from
    67   * the file systems using the paths specified in the given
    68   * class path. By default, this is the value returned by
    69   * ClassPath.getClassPath().
    70   * <br>
    71   * It is designed to be used as a singleton, however it
    72   * can also be used with custom classpaths.
    73   *
    74  /**
    75   * Abstract definition of a class repository. Instances may be used
    76   * to load classes from different sources and may be used in the
    77   * Repository.setRepository method.
    78   *
    79   * @see org.apache.bcel.Repository
    80   *
    81   * @version $Id: SyntheticRepository.java,v 1.6 2002/11/10 18:30:05 mdahm Exp $
    82   * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
    83   * @author David Dixon-Peugh
    84   */
    85  public class SyntheticRepository implements Repository {
    86    private static final String DEFAULT_PATH = ClassPath.getClassPath();
    87
    88    private static HashMap _instances = new HashMap(); // CLASSPATH X REPOSITORY
    89
    90    private ClassPath _path = null;
    91    private HashMap   _loadedClasses = new HashMap(); // CLASSNAME X JAVACLASS
    92
    93    private SyntheticRepository(ClassPath path) {
    94      _path = path;
    95    }
    96
    97    public static SyntheticRepository getInstance() {
    98      return getInstance(ClassPath.SYSTEM_CLASS_PATH);
    99    }
    100
    101   public static SyntheticRepository getInstance(ClassPath classPath) {
    102     SyntheticRepository rep = (SyntheticRepository)_instances.get(classPath);
    103
    104     if(rep == null) {
    105       rep = new SyntheticRepository(classPath);
    106       _instances.put(classPath, rep);
    107     }
    108
    109     return rep;
    110   }
    111
    112   /***
    113    * Store a new JavaClass instance into this Repository.
    114    */
    115   public void storeClass(JavaClass clazz) {
    116     _loadedClasses.put(clazz.getClassName(), clazz);
    117     clazz.setRepository(this);
    118  }
    119
    120   /***
    121    * Remove class from repository
    122    */
    123   public void removeClass(JavaClass clazz) {
    124     _loadedClasses.remove(clazz.getClassName());
    125   }
    126
    127   /***
    128    * Find an already defined (cached) JavaClass object by name.
    129    */
    130   public JavaClass findClass(String className) {
    131     return (JavaClass)_loadedClasses.get(className);
    132   }
    133
    134   /***
    135    * Load a JavaClass object for the given class name using
    136    * the CLASSPATH environment variable.
    137    */
    138   public JavaClass loadClass(String className)
    139     throws ClassNotFoundException
    140   {
    141     if(className == null || className.equals("")) {
    142       throw new IllegalArgumentException("Invalid class name " + className);
    143     }
    144
    145     className = className.replace('/', '.'); // Just in case, canonical form
    146
    147     try {
    148       return loadClass(_path.getInputStream(className), className);
    149     } catch(IOException e) {
    150       throw new ClassNotFoundException("Exception while looking for class " +
    151 				       className + ": " + e.toString());
    152     }
    153   }
    154
    155   /***
    156    * Try to find class source via getResourceAsStream().
    157    * @see Class
    158    * @return JavaClass object for given runtime class
    159    */
    160   public JavaClass loadClass(Class clazz) throws ClassNotFoundException {
    161     String className = clazz.getName();
    162     String name      = className;
    163     int    i         = name.lastIndexOf('.');
    164
    165     if(i > 0) {
    166       name = name.substring(i + 1);
    167     }
    168
    169     return loadClass(clazz.getResourceAsStream(name + ".class"), className);
    170   }
    171
    172   private JavaClass loadClass(InputStream is, String className)
    173     throws ClassNotFoundException
    174   {
    175     JavaClass clazz = findClass(className);
    176
    177     if(clazz != null) {
    178       return clazz;
    179     }
    180
    181     try {
    182       if(is != null) {
    183 	ClassParser parser = new ClassParser(is, className);
    184 	clazz = parser.parse();
    185
    186 	storeClass(clazz);
    187
    188 	return clazz;
    189       }
    190     } catch(IOException e) {
    191       throw new ClassNotFoundException("Exception while looking for class " +
    192 				       className + ": " + e.toString());
    193     }
    194
    195     throw new ClassNotFoundException("SyntheticRepository could not load " +
    196 				     className);
    197   }
    198
    199   /*** Clear all entries from cache.
    200    */
    201   public void clear() {
    202     _loadedClasses.clear();
    203   }
    204 }

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