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1   /*
2    * Copyright  2000-2004 The Apache Software Foundation
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License"); 
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License. 
15   *
16   */
17  package org.apache.bcel.util;
18  
19  import java.util.LinkedList;
20  import org.apache.bcel.classfile.JavaClass;
21  
22  /*** 
23   * Utility class implementing a (typesafe) queue of JavaClass
24   * objects.
25   *
26   * @version $Id: ClassQueue.java 386056 2006-03-15 11:31:56Z tcurdt $
27   * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A> 
28   */
29  public class ClassQueue implements java.io.Serializable {
30  
31      protected LinkedList vec = new LinkedList();
32  
33  
34      public void enqueue( JavaClass clazz ) {
35          vec.addLast(clazz);
36      }
37  
38  
39      public JavaClass dequeue() {
40          return (JavaClass) vec.removeFirst();
41      }
42  
43  
44      public boolean empty() {
45          return vec.isEmpty();
46      }
47  
48  
49      public String toString() {
50          return vec.toString();
51      }
52  }