    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 */
    017package org.apache.bcel.util;
    018
    019import java.util.HashMap;
    020import java.util.Map;
    021
    022import org.apache.bcel.classfile.JavaClass;
    023import org.apache.commons.lang3.ArrayUtils;
    024
    025/**
    026 * 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.
    027 *
    028 * @see ClassStack
    029 */
    030public class ClassSet {
    031
    032    private final Map<String, JavaClass> map = new HashMap<>();
    033
    034    public boolean add(final JavaClass clazz) {
    035        return map.putIfAbsent(clazz.getClassName(), clazz) != null;
    036    }
    037
    038    public boolean empty() {
    039        return map.isEmpty();
    040    }
    041
    042    public String[] getClassNames() {
    043        return map.keySet().toArray(ArrayUtils.EMPTY_STRING_ARRAY);
    044    }
    045
    046    public void remove(final JavaClass clazz) {
    047        map.remove(clazz.getClassName());
    048    }
    049
    050    public JavaClass[] toArray() {
    051        return map.values().toArray(JavaClass.EMPTY_ARRAY);
    052    }
    053}