    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 1806200 2017-08-25 16:33:06Z ggregory $
    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}