1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * https://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 */ 19 package org.apache.bcel.util; 20 21 import java.util.Stack; 22 23 import org.apache.bcel.classfile.JavaClass; 24 25 /** 26 * Utility class implementing a (typesafe) stack of JavaClass objects. 27 * 28 * @see Stack 29 */ 30 public class ClassStack { 31 32 private final Stack<JavaClass> stack = new Stack<>(); 33 34 public boolean empty() { 35 return stack.empty(); 36 } 37 38 public JavaClass pop() { 39 return stack.pop(); 40 } 41 42 public void push(final JavaClass clazz) { 43 stack.push(clazz); 44 } 45 46 public JavaClass top() { 47 return stack.peek(); 48 } 49 }