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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   *
17   */
18  package org.apache.bcel.util;
19  
20  import java.util.LinkedList;
21  
22  import org.apache.bcel.classfile.JavaClass;
23  
24  /** 
25   * Utility class implementing a (typesafe) queue of JavaClass
26   * objects.
27   *
28   * @version $Id: ClassQueue.html 990178 2016-06-08 08:17:52Z britter $
29   */
30  public class ClassQueue {
31  
32      /**
33       * @deprecated (since 6.0) will be made private; do not access
34       */
35      @Deprecated
36      protected LinkedList<JavaClass> vec = new LinkedList<>(); // TODO not used externally
37  
38  
39      public void enqueue( final JavaClass clazz ) {
40          vec.addLast(clazz);
41      }
42  
43  
44      public JavaClass dequeue() {
45          return vec.removeFirst();
46      }
47  
48  
49      public boolean empty() {
50          return vec.isEmpty();
51      }
52  
53  
54      @Override
55      public String toString() {
56          return vec.toString();
57      }
58  }