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}