    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.HashMap;
    021import java.util.Map;
    022
    023import org.apache.bcel.classfile.JavaClass;
    024import org.apache.commons.lang3.ArrayUtils;
    025
    026/**
    027 * Utility class implementing a (type-safe) set of JavaClass objects. Since JavaClass has no equals() method, the name of the class is used for comparison.
    028 *
    029 * @see ClassStack
    030 */
    031public class ClassSet {
    032
    033    private final Map<String, JavaClass> map = new HashMap<>();
    034
    035    public boolean add(final JavaClass clazz) {
    036        return map.putIfAbsent(clazz.getClassName(), clazz) != null;
    037    }
    038
    039    public boolean empty() {
    040        return map.isEmpty();
    041    }
    042
    043    public String[] getClassNames() {
    044        return map.keySet().toArray(ArrayUtils.EMPTY_STRING_ARRAY);
    045    }
    046
    047    public void remove(final JavaClass clazz) {
    048        map.remove(clazz.getClassName());
    049    }
    050
    051    public JavaClass[] toArray() {
    052        return map.values().toArray(JavaClass.EMPTY_ARRAY);
    053    }
    054}