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