| /* |
| * Copyright 2008 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.core.client; |
| |
| /** |
| * A utility class for measuring elapsed time. |
| */ |
| public class Duration { |
| |
| /** |
| * Returns the same result as {@link System#currentTimeMillis()}, but as a |
| * double. Because emulated long math is significantly slower than doubles in |
| * Production Mode, this method is to be preferred. |
| */ |
| public static double currentTimeMillis() { |
| return JsDate.now(); |
| } |
| |
| private static native int uncheckedConversion(double elapsed) /*-{ |
| return elapsed; |
| }-*/; |
| |
| private double start = currentTimeMillis(); |
| |
| /** |
| * Creates a new Duration whose start time is now. |
| */ |
| public Duration() { |
| } |
| |
| /** |
| * Returns the number of milliseconds that have elapsed since this object was |
| * created. |
| */ |
| public int elapsedMillis() { |
| return uncheckedConversion(currentTimeMillis() - start); |
| } |
| |
| /** |
| * Returns the time when the object was created. |
| */ |
| public double getStartMillis() { |
| return start; |
| } |
| } |