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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  
22  import org.apache.bcel.classfile.JavaClass;
23  
24  /** 
25   * Utility class implementing a (typesafe) stack of JavaClass objects.
26   *
27   * @version $Id: ClassStack.html 990178 2016-06-08 08:17:52Z britter $
28   * @see Stack
29   */
30  public class ClassStack {
31  
32      private final Stack<JavaClass> stack = new Stack<>();
33  
34  
35      public void push( final JavaClass clazz ) {
36          stack.push(clazz);
37      }
38  
39  
40      public JavaClass pop() {
41          return stack.pop();
42      }
43  
44  
45      public JavaClass top() {
46          return stack.peek();
47      }
48  
49  
50      public boolean empty() {
51          return stack.empty();
52      }
53  }