/*
* 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));
}
}