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     */
018    package org.apache.bcel.util;
019    
020    import java.util.LinkedList;
021    import org.apache.bcel.classfile.JavaClass;
022    
023    /** 
024     * Utility class implementing a (typesafe) queue of JavaClass
025     * objects.
026     *
027     * @version $Id: ClassQueue.java 1152072 2011-07-29 01:54:05Z dbrosius $
028     * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A> 
029     */
030    public class ClassQueue implements java.io.Serializable {
031    
032        private static final long serialVersionUID = 685144104322420292L;
033        protected LinkedList<JavaClass> vec = new LinkedList<JavaClass>();
034    
035    
036        public void enqueue( JavaClass clazz ) {
037            vec.addLast(clazz);
038        }
039    
040    
041        public JavaClass dequeue() {
042            return vec.removeFirst();
043        }
044    
045    
046        public boolean empty() {
047            return vec.isEmpty();
048        }
049    
050    
051        @Override
052        public String toString() {
053            return vec.toString();
054        }
055    }