    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 *   https://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019package org.apache.bcel.util;
    020
    021import java.util.HashMap;
    022import java.util.Map;
    023
    024import org.apache.bcel.classfile.JavaClass;
    025import org.apache.commons.lang3.ArrayUtils;
    026
    027/**
    028 * 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.
    029 *
    030 * @see ClassStack
    031 */
    032public class ClassSet {
    033
    034    private final Map<String, JavaClass> map = new HashMap<>();
    035
    036    public boolean add(final JavaClass clazz) {
    037        return map.putIfAbsent(clazz.getClassName(), clazz) != null;
    038    }
    039
    040    public boolean empty() {
    041        return map.isEmpty();
    042    }
    043
    044    public String[] getClassNames() {
    045        return map.keySet().toArray(ArrayUtils.EMPTY_STRING_ARRAY);
    046    }
    047
    048    public void remove(final JavaClass clazz) {
    049        map.remove(clazz.getClassName());
    050    }
    051
    052    public JavaClass[] toArray() {
    053        return map.values().toArray(JavaClass.EMPTY_ARRAY);
    054    }
    055}