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.LinkedList;
021
022import org.apache.bcel.classfile.JavaClass;
023
024/**
025 * Utility class implementing a (typesafe) queue of JavaClass
026 * objects.
027 *
028 */
029public class ClassQueue {
030
031    /**
032     * @deprecated (since 6.0) will be made private; do not access
033     */
034    @Deprecated
035    protected LinkedList<JavaClass> vec = new LinkedList<>(); // TODO not used externally
036
037
038    public void enqueue( final JavaClass clazz ) {
039        vec.addLast(clazz);
040    }
041
042
043    public JavaClass dequeue() {
044        return vec.removeFirst();
045    }
046
047
048    public boolean empty() {
049        return vec.isEmpty();
050    }
051
052
053    @Override
054    public String toString() {
055        return vec.toString();
056    }
057}