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.util.HashMap;
import java.util.Collection;
import com.sun.org.apache.bcel.internal.classfile.JavaClass;

/** 
 * Utility class implementing a (typesafe) set of JavaClass objects.
 * Since JavaClass has no equals() method, the name of the class is
 * used for comparison.
 *
 * @version $Id: ClassSet.java,v 1.1.2.1 2005/07/31 23:47:02 jeffsuttor Exp $
 * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A> 
 * @see ClassStack
*/
public class ClassSet implements java.io.Serializable {
  private HashMap _map = new HashMap();

  public boolean add(JavaClass clazz) {
    boolean result = false;

    if(!_map.containsKey(clazz.getClassName())) {
      result = true;
      _map.put(clazz.getClassName(), clazz);
    }

    return result;
  }

  public void      remove(JavaClass clazz) { _map.remove(clazz.getClassName()); }
  public boolean   empty()                 { return _map.isEmpty(); }

  public JavaClass[] toArray() {
    Collection values = _map.values();
    JavaClass[] classes = new JavaClass[values.size()];
    values.toArray(classes);
    return classes;
  }

  public String[] getClassNames() {
    return (String[])_map.keySet().toArray(new String[_map.keySet().size()]);
  }
}