| /* |
| * Copyright 2010 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.i18n.shared; |
| |
| import com.google.gwt.i18n.client.HasDirection.Direction; |
| |
| /** |
| * Direction estimator that uses the "first strong" heuristic. |
| */ |
| public class FirstStrongDirectionEstimator extends DirectionEstimator { |
| |
| /** |
| * An instance of FirstStrongDirectionEstimator, to be returned by |
| * {@link #get}. |
| */ |
| private static final FirstStrongDirectionEstimator instance = |
| new FirstStrongDirectionEstimator(); |
| |
| /** |
| * Get an instance of FirstStrongDirectionEstimator. |
| * |
| * @return An instance of FirstStrongDirectionEstimator. |
| */ |
| public static FirstStrongDirectionEstimator get() { |
| return instance; |
| } |
| |
| /** |
| * Estimates the direction of a given string using the "first strong" |
| * heuristic: The return value is determined by the first character in the |
| * string with strong directionality. If there is no such character, the |
| * return value is DEFAULT. |
| * |
| * @param str Input string. |
| * @return Direction The estimated direction of {@code str}. |
| */ |
| @Override |
| public Direction estimateDirection(String str) { |
| return BidiUtils.get().startsWithRtl(str) ? Direction.RTL : |
| BidiUtils.get().startsWithLtr(str) ? Direction.LTR : Direction.DEFAULT; |
| } |
| } |