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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.Stack;
    20  import org.apache.bcel.classfile.JavaClass;
    21
    22  /***
    23   * Utility class implementing a (typesafe) stack of JavaClass objects.
    24   *
    25   * @version $Id: ClassStack.java 386056 2006-03-15 11:31:56Z tcurdt $
    26   * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
    27   * @see Stack
    28   */
    29  public class ClassStack implements java.io.Serializable {
    30
    31      private Stack stack = new Stack();
    32
    33
    34      public void push( JavaClass clazz ) {
    35          stack.push(clazz);
    36      }
    37
    38
    39      public JavaClass pop() {
    40          return (JavaClass) stack.pop();
    41      }
    42
    43
    44      public JavaClass top() {
    45          return (JavaClass) stack.peek();
    46      }
    47
    48
    49      public boolean empty() {
    50          return stack.empty();
    51      }
    52  }