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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.Stack;
21  import org.apache.bcel.classfile.JavaClass;
22  
23  /** 
24   * Utility class implementing a (typesafe) stack of JavaClass objects.
25   *
26   * @version $Id: ClassStack.html 898356 2014-02-18 05:44:40Z ggregory $
27   * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A> 
28   * @see Stack
29   */
30  public class ClassStack implements java.io.Serializable {
31  
32      private static final long serialVersionUID = 6126079269396985982L;
33      private Stack<JavaClass> stack = new Stack<JavaClass>();
34  
35  
36      public void push( JavaClass clazz ) {
37          stack.push(clazz);
38      }
39  
40  
41      public JavaClass pop() {
42          return stack.pop();
43      }
44  
45  
46      public JavaClass top() {
47          return stack.peek();
48      }
49  
50  
51      public boolean empty() {
52          return stack.empty();
53      }
54  }