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 */
017package org.apache.bcel.util;
018
019import java.util.Stack;
020
021import org.apache.bcel.classfile.JavaClass;
022
023/**
024 * Utility class implementing a (typesafe) stack of JavaClass objects.
025 *
026 * @see Stack
027 */
028public class ClassStack {
029
030    private final Stack<JavaClass> stack = new Stack<>();
031
032    public boolean empty() {
033        return stack.empty();
034    }
035
036    public JavaClass pop() {
037        return stack.pop();
038    }
039
040    public void push(final JavaClass clazz) {
041        stack.push(clazz);
042    }
043
044    public JavaClass top() {
045        return stack.peek();
046    }
047}