/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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

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.
 *
 * @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()]);
  }
}