001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 *  Unless required by applicable law or agreed to in writing, software
012 *  distributed under the License is distributed on an "AS IS" BASIS,
013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 *  See the License for the specific language governing permissions and
015 *  limitations under the License.
016 *
017 */
018package org.apache.bcel.util;
019
020import java.util.Stack;
021
022import org.apache.bcel.classfile.JavaClass;
023
024/** 
025 * Utility class implementing a (typesafe) stack of JavaClass objects.
026 *
027 * @version $Id: ClassStack.java 1747278 2016-06-07 17:28:43Z britter $
028 * @see Stack
029 */
030public class ClassStack {
031
032    private final Stack<JavaClass> stack = new Stack<>();
033
034
035    public void push( final JavaClass clazz ) {
036        stack.push(clazz);
037    }
038
039
040    public JavaClass pop() {
041        return stack.pop();
042    }
043
044
045    public JavaClass top() {
046        return stack.peek();
047    }
048
049
050    public boolean empty() {
051        return stack.empty();
052    }
053}