1 /*
   2  * Copyright (c) 2017, 2019, 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
  28  * objects.
  29  *
  30  * @version $Id$
  31  * @LastModified: Jun 2019
  32  */
  33 public class ClassQueue {
  34 
  35     private final LinkedList<JavaClass> vec = new LinkedList<>();
  36 
  37 
  38     public void enqueue( final JavaClass clazz ) {
  39         vec.addLast(clazz);
  40     }
  41 
  42 
  43     public JavaClass dequeue() {
  44         return vec.removeFirst();
  45     }
  46 
  47 
  48     public boolean empty() {
  49         return vec.isEmpty();
  50     }
  51 
  52 
  53     @Override
  54     public String toString() {
  55         return vec.toString();
  56     }
  57 }