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 objects.
026 *
027 */
028public class ClassQueue {
029
030    /**
031     * @deprecated (since 6.0) will be made private; do not access
032     */
033    @Deprecated
034    protected LinkedList<JavaClass> vec = new LinkedList<>(); // TODO not used externally
035
036    public JavaClass dequeue() {
037        return vec.removeFirst();
038    }
039
040    public boolean empty() {
041        return vec.isEmpty();
042    }
043
044    public void enqueue(final JavaClass clazz) {
045        vec.addLast(clazz);
046    }
047
048    @Override
049    public String toString() {
050        return vec.toString();
051    }
052}