1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  */
   4 /*
   5  * Licensed to the Apache Software Foundation (ASF) under one or more
   6  * contributor license agreements.  See the NOTICE file distributed with
   7  * this work for additional information regarding copyright ownership.
   8  * The ASF licenses this file to You under the Apache License, Version 2.0
   9  * (the "License"); you may not use this file except in compliance with
  10  * the License.  You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20 package com.sun.org.apache.bcel.internal.util;
  21 
  22 import java.util.LinkedList;
  23 
  24 import com.sun.org.apache.bcel.internal.classfile.JavaClass;
  25 
  26 /**
  27  * Utility class implementing a (typesafe) queue of JavaClass objects.
  28  *
  29  * @version $Id: ClassQueue.java 1747278 2016-06-07 17:28:43Z britter $
  30  */
  31 public class ClassQueue {
  32 
  33     private final LinkedList<JavaClass> vec = new LinkedList<>();
  34 
  35     public void enqueue(final JavaClass clazz) {
  36         vec.addLast(clazz);
  37     }
  38 
  39     public JavaClass dequeue() {
  40         return vec.removeFirst();
  41     }
  42 
  43     public boolean empty() {
  44         return vec.isEmpty();
  45     }
  46 
  47     @Override
  48     public String toString() {
  49         return vec.toString();
  50     }
  51 }