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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  package org.apache.bcel.util;
18  
19  import java.util.LinkedList;
20  
21  import org.apache.bcel.classfile.JavaClass;
22  
23  /**
24   * Utility class implementing a (typesafe) queue of JavaClass objects.
25   */
26  public class ClassQueue {
27  
28      /**
29       * @deprecated (since 6.0) will be made private; do not access
30       */
31      @Deprecated
32      protected LinkedList<JavaClass> vec = new LinkedList<>(); // TODO not used externally
33  
34      public JavaClass dequeue() {
35          return vec.removeFirst();
36      }
37  
38      public boolean empty() {
39          return vec.isEmpty();
40      }
41  
42      public void enqueue(final JavaClass clazz) {
43          vec.addLast(clazz);
44      }
45  
46      @Override
47      public String toString() {
48          return vec.toString();
49      }
50  }