    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 1806200 2017-08-25 16:33:06Z ggregory $
    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}