| /* |
| * 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.activity.shared; |
| |
| import com.google.gwt.place.shared.Place; |
| |
| /** |
| * Wraps an activity mapper and applies a filter to the place objects that it |
| * sees. |
| */ |
| public class FilteredActivityMapper implements ActivityMapper { |
| |
| /** |
| * Implemented by objects that want to interpret one place as another. |
| */ |
| public interface Filter { |
| /** |
| * Returns the filtered interpretation of the given {@link Place}. |
| * |
| * @param place the input {@link Place}. |
| * @return the output {@link Place}. |
| */ |
| Place filter(Place place); |
| } |
| |
| private final Filter filter; |
| private final ActivityMapper wrapped; |
| |
| /** |
| * Constructs a FilteredActivityMapper object. |
| * |
| * @param filter a Filter object |
| * @param wrapped an ActivityMapper object |
| */ |
| public FilteredActivityMapper(Filter filter, ActivityMapper wrapped) { |
| this.filter = filter; |
| this.wrapped = wrapped; |
| } |
| |
| public Activity getActivity(Place place) { |
| return wrapped.getActivity(filter.filter(place)); |
| } |
| } |