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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *   https://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.bcel.util;
20  
21  import java.util.Stack;
22  
23  import org.apache.bcel.classfile.JavaClass;
24  
25  /**
26   * Utility class implementing a (typesafe) stack of JavaClass objects.
27   *
28   * @see Stack
29   */
30  public class ClassStack {
31  
32      private final Stack<JavaClass> stack = new Stack<>();
33  
34      public boolean empty() {
35          return stack.empty();
36      }
37  
38      public JavaClass pop() {
39          return stack.pop();
40      }
41  
42      public void push(final JavaClass clazz) {
43          stack.push(clazz);
44      }
45  
46      public JavaClass top() {
47          return stack.peek();
48      }
49  }