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 * @version $Id: ClassQueue.java 1747278 2016-06-07 17:28:43Z britter $
029 */
030public class ClassQueue {
031
032    /**
033     * @deprecated (since 6.0) will be made private; do not access
034     */
035    @Deprecated
036    protected LinkedList<JavaClass> vec = new LinkedList<>(); // TODO not used externally
037
038
039    public void enqueue( final JavaClass clazz ) {
040        vec.addLast(clazz);
041    }
042
043
044    public JavaClass dequeue() {
045        return vec.removeFirst();
046    }
047
048
049    public boolean empty() {
050        return vec.isEmpty();
051    }
052
053
054    @Override
055    public String toString() {
056        return vec.toString();
057    }
058}