1 /*
   2  * Copyright (c) 2017, 2020, 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  * @LastModified: Jan 2020
  31  */
  32 public class ClassQueue {
  33 
  34     private final LinkedList<JavaClass> vec = new LinkedList<>();
  35 
  36 
  37     public void enqueue( final JavaClass clazz ) {
  38         vec.addLast(clazz);
  39     }
  40 
  41 
  42     public JavaClass dequeue() {
  43         return vec.removeFirst();
  44     }
  45 
  46 
  47     public boolean empty() {
  48         return vec.isEmpty();
  49     }
  50 
  51 
  52     @Override
  53     public String toString() {
  54         return vec.toString();
  55     }
  56 }