| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except |
| * in compliance with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software distributed under the License |
| * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express |
| * or implied. See the License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.dev.util.collect; |
| |
| import cern.colt.list.IntArrayList; |
| |
| import java.io.Serializable; |
| |
| /** |
| * An int stack. |
| * <p> |
| * Because only int primitives are used performance and memory usage can surpass Object stacks. |
| */ |
| public class IntStack implements Serializable { |
| |
| private IntArrayList values = new IntArrayList(); |
| |
| public boolean isEmpty() { |
| return values.isEmpty(); |
| } |
| |
| public int pop() { |
| int lastIndex = values.size() - 1; |
| int value = values.get(lastIndex); |
| values.remove(lastIndex); |
| return value; |
| } |
| |
| public void push(int value) { |
| values.add(value); |
| } |
| } |