ClassLoaderRepository xref

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    1   /*
    2    * Copyright  2000-2004 The Apache Software Foundation
    3    *
    4    *  Licensed under the Apache License, Version 2.0 (the "License");
    5    *  you may not use this file except in compliance with the License.
    6    *  You may obtain a copy of the License at
    7    *
    8    *      http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   *  Unless required by applicable law or agreed to in writing, software
    11   *  distributed under the License is distributed on an "AS IS" BASIS,
    12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   *  See the License for the specific language governing permissions and
    14   *  limitations under the License.
    15   *
    16   */
    17  package org.apache.bcel.util;
    18
    19  import java.io.IOException;
    20  import java.io.InputStream;
    21  import java.util.HashMap;
    22  import java.util.Map;
    23  import org.apache.bcel.classfile.ClassParser;
    24  import org.apache.bcel.classfile.JavaClass;
    25
    26  /***
    27   * The repository maintains information about which classes have
    28   * been loaded.
    29   *
    30   * It loads its data from the ClassLoader implementation
    31   * passed into its constructor.
    32   *
    33   * @see org.apache.bcel.Repository
    34   *
    35   * @version $Id: ClassLoaderRepository.java 386056 2006-03-15 11:31:56Z tcurdt $
    36   * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
    37   * @author David Dixon-Peugh
    38   */
    39  public class ClassLoaderRepository implements Repository {
    40
    41      private java.lang.ClassLoader loader;
    42      private Map loadedClasses = new HashMap(); // CLASSNAME X JAVACLASS
    43
    44
    45      public ClassLoaderRepository(java.lang.ClassLoader loader) {
    46          this.loader = loader;
    47      }
    48
    49
    50      /***
    51       * Store a new JavaClass into this Repository.
    52       */
    53      public void storeClass( JavaClass clazz ) {
    54          loadedClasses.put(clazz.getClassName(), clazz);
    55          clazz.setRepository(this);
    56      }
    57
    58
    59      /***
    60       * Remove class from repository
    61       */
    62      public void removeClass( JavaClass clazz ) {
    63          loadedClasses.remove(clazz.getClassName());
    64      }
    65
    66
    67      /***
    68       * Find an already defined JavaClass.
    69       */
    70      public JavaClass findClass( String className ) {
    71          if (loadedClasses.containsKey(className)) {
    72              return (JavaClass) loadedClasses.get(className);
    73          } else {
    74              return null;
    75          }
    76      }
    77
    78
    79      /***
    80       * Lookup a JavaClass object from the Class Name provided.
    81       */
    82      public JavaClass loadClass( String className ) throws ClassNotFoundException {
    83          String classFile = className.replace('.', '/');
    84          JavaClass RC = findClass(className);
    85          if (RC != null) {
    86              return RC;
    87          }
    88          try {
    89              InputStream is = loader.getResourceAsStream(classFile + ".class");
    90              if (is == null) {
    91                  throw new ClassNotFoundException(className + " not found.");
    92              }
    93              ClassParser parser = new ClassParser(is, className);
    94              RC = parser.parse();
    95              storeClass(RC);
    96              return RC;
    97          } catch (IOException e) {
    98              throw new ClassNotFoundException(e.toString());
    99          }
    100     }
    101
    102
    103     public JavaClass loadClass( Class clazz ) throws ClassNotFoundException {
    104         return loadClass(clazz.getName());
    105     }
    106
    107
    108     /*** Clear all entries from cache.
    109      */
    110     public void clear() {
    111         loadedClasses.clear();
    112     }
    113
    114
    115     /*
    116      * @return null
    117      */
    118     public ClassPath getClassPath() {
    119         return null;
    120     }
    121 }