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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.Stack;
20  
21  import org.apache.bcel.classfile.JavaClass;
22  
23  /**
24   * Utility class implementing a (typesafe) stack of JavaClass objects.
25   *
26   * @see Stack
27   */
28  public class ClassStack {
29  
30      private final Stack<JavaClass> stack = new Stack<>();
31  
32      public boolean empty() {
33          return stack.empty();
34      }
35  
36      public JavaClass pop() {
37          return stack.pop();
38      }
39  
40      public void push(final JavaClass clazz) {
41          stack.push(clazz);
42      }
43  
44      public JavaClass top() {
45          return stack.peek();
46      }
47  }