001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 *
017 */
018package org.apache.bcel.util;
019
020import java.util.Collection;
021import java.util.HashMap;
022import java.util.Map;
023
024import org.apache.bcel.classfile.JavaClass;
025
026/** 
027 * Utility class implementing a (typesafe) set of JavaClass objects.
028 * Since JavaClass has no equals() method, the name of the class is
029 * used for comparison.
030 *
031 * @version $Id: ClassSet.java 1749603 2016-06-21 20:50:19Z ggregory $
032 * @see ClassStack
033 */
034public class ClassSet {
035
036    private final Map<String, JavaClass> map = new HashMap<>();
037
038
039    public boolean add( final JavaClass clazz ) {
040        boolean result = false;
041        if (!map.containsKey(clazz.getClassName())) {
042            result = true;
043            map.put(clazz.getClassName(), clazz);
044        }
045        return result;
046    }
047
048
049    public void remove( final JavaClass clazz ) {
050        map.remove(clazz.getClassName());
051    }
052
053
054    public boolean empty() {
055        return map.isEmpty();
056    }
057
058
059    public JavaClass[] toArray() {
060        final Collection<JavaClass> values = map.values();
061        final JavaClass[] classes = new JavaClass[values.size()];
062        values.toArray(classes);
063        return classes;
064    }
065
066
067    public String[] getClassNames() {
068        return map.keySet().toArray(new String[map.size()]);
069    }
070}