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 * @see Stack 028 */ 029public class ClassStack { 030 031 private final Stack<JavaClass> stack = new Stack<>(); 032 033 034 public void push( final JavaClass clazz ) { 035 stack.push(clazz); 036 } 037 038 039 public JavaClass pop() { 040 return stack.pop(); 041 } 042 043 044 public JavaClass top() { 045 return stack.peek(); 046 } 047 048 049 public boolean empty() { 050 return stack.empty(); 051 } 052}