    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}