    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 $Id$
    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}