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}