/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

package com.sun.org.apache.bcel.internal.util;

/* ====================================================================

 * The Apache Software License, Version 1.1

 *

 * Copyright (c) 2001 The Apache Software Foundation.  All rights

 * reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. The end-user documentation included with the redistribution,

 *    if any, must include the following acknowledgment:

 *       "This product includes software developed by the

 *        Apache Software Foundation (http://www.apache.org/)."

 *    Alternately, this acknowledgment may appear in the software itself,

 *    if and wherever such third-party acknowledgments normally appear.

 *

 * 4. The names "Apache" and "Apache Software Foundation" and

 *    "Apache BCEL" must not be used to endorse or promote products

 *    derived from this software without prior written permission. For

 *    written permission, please contact apache@apache.org.

 *

 * 5. Products derived from this software may not be called "Apache",

 *    "Apache BCEL", nor may "Apache" appear in their name, without

 *    prior written permission of the Apache Software Foundation.

 *

 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED

 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT

 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * ====================================================================

 *

 * This software consists of voluntary contributions made by many

 * individuals on behalf of the Apache Software Foundation.  For more

 * information on the Apache Software Foundation, please see

 * <http://www.apache.org/>.

 */

import java.io.*;

import java.util.Map;

import java.util.HashMap;

import com.sun.org.apache.bcel.internal.classfile.*;

/**

 * The repository maintains information about which classes have

 * been loaded.

 *

 * It loads its data from the ClassLoader implementation

 * passed into its constructor.

 *

 * @see com.sun.org.apache.bcel.internal.Repository

 *

 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>

 * @author David Dixon-Peugh

 */

public class ClassLoaderRepository

  implements Repository

{

  private java.lang.ClassLoader loader;

  private HashMap loadedClasses =

    new HashMap(); // CLASSNAME X JAVACLASS

  public ClassLoaderRepository( java.lang.ClassLoader loader ) {

    this.loader = loader;

  }

  /**

   * Store a new JavaClass into this Repository.

   */

  public void storeClass( JavaClass clazz ) {

    loadedClasses.put( clazz.getClassName(),

                       clazz );

    clazz.setRepository( this );

  }

  /**

   * Remove class from repository

   */

  public void removeClass(JavaClass clazz) {

    loadedClasses.remove(clazz.getClassName());

  }

  /**

   * Find an already defined JavaClass.

   */

  public JavaClass findClass( String className ) {

    if ( loadedClasses.containsKey( className )) {

      return (JavaClass) loadedClasses.get( className );

    } else {

      return null;

    }

  }

  /**

   * Lookup a JavaClass object from the Class Name provided.

   */

  public JavaClass loadClass( String className )

    throws ClassNotFoundException

  {

    String classFile = className.replace('.', '/');

    JavaClass RC = findClass( className );

    if (RC != null) { return RC; }

    try {

      InputStream is =

        loader.getResourceAsStream( classFile + ".class" );

      if(is == null) {

        throw new ClassNotFoundException(className + " not found.");

      }

      ClassParser parser = new ClassParser( is, className );

      RC = parser.parse();

      storeClass( RC );

      return RC;

    } catch (IOException e) {

      throw new ClassNotFoundException( e.toString() );

    }

  }

  public JavaClass loadClass(Class clazz) throws ClassNotFoundException {

    return loadClass(clazz.getName());

  }

  /** Clear all entries from cache.

   */

  public void clear() {

    loadedClasses.clear();

  }

}