    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 * @see ClassStack
    032 */
    033public class ClassSet {
    034
    035    private final Map<String, JavaClass> map = new HashMap<>();
    036
    037
    038    public boolean add( final JavaClass clazz ) {
    039        boolean result = false;
    040        if (!map.containsKey(clazz.getClassName())) {
    041            result = true;
    042            map.put(clazz.getClassName(), clazz);
    043        }
    044        return result;
    045    }
    046
    047
    048    public void remove( final JavaClass clazz ) {
    049        map.remove(clazz.getClassName());
    050    }
    051
    052
    053    public boolean empty() {
    054        return map.isEmpty();
    055    }
    056
    057
    058    public JavaClass[] toArray() {
    059        final Collection<JavaClass> values = map.values();
    060        final JavaClass[] classes = new JavaClass[values.size()];
    061        values.toArray(classes);
    062        return classes;
    063    }
    064
    065
    066    public String[] getClassNames() {
    067        return map.keySet().toArray(new String[map.size()]);
    068    }
    069}