/*
* UpdatableMappable.java
*
* Copyright � 1998-2011 Research In Motion Limited
*
* 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.
*
* Note: For the sake of simplicity, this sample application may not leverage
* resource bundles and resource strings. However, it is STRONGLY recommended
* that application developers make use of the localization features available
* within the BlackBerry development platform to ensure a seamless application
* experience across a variety of languages and geographies. For more information
* on localizing your application, please refer to the BlackBerry Java Development
* Environment Development Guide associated with this release.
*/
package com.rim.samples.device.dynamicmappabledemo;
import net.rim.device.api.lbs.maps.model.DynamicMappable;
import net.rim.device.api.lbs.maps.model.MapLocation;
import net.rim.device.api.lbs.maps.model.MapPoint;
import net.rim.device.api.lbs.maps.model.MappableChangeEvent;
import net.rim.device.api.lbs.maps.model.MappableEventManager;
/**
* A Mappable that is also a Dynamic Mappable which can be auto updated as
* needed
*/
public class UpdatableMappable extends MapLocation implements DynamicMappable {
private final MappableEventManager _eventManager;
private final MapPoint _mapPointOldState;
/**
* Creates a new UpdatableMappable object
*
* @param lat
* Initial latitude for the UpdatableMappable
* @param lon
* Initial longtitude for the UpdatableMappable
* @param name
* Name for the UpdatableMappable
* @param description
* Description for the UpdatableMappable
*/
public UpdatableMappable(final double lat, final double lon,
final String name, final String description) {
super(lat, lon, name, description);
_eventManager = new MappableEventManager();
_mapPointOldState = new MapPoint(lat, lon);
}
/**
* @see net.rim.device.api.lbs.maps.model.MapPoint#setLon(double)
*/
public void setLon(final double lon) {
// Record the old value before it's changed. This way we can
// notify the MapField of both the old and new values in the
// update() method.
_mapPointOldState.setLon(getLon());
super.setLon(lon);
}
/**
* @see net.rim.device.api.lbs.maps.model.MapPoint#setLat(double)
*/
public void setLat(final double lat) {
// Record the old value before it's changed. This way we can
// notify the MapField of both the old and new values in the
// update() method.
_mapPointOldState.setLat(getLat());
super.setLat(lat);
}
/**
* Forces the mappable to be updated
*/
public void update() {
final MappableChangeEvent event = new MappableChangeEvent();
// The old value only needs to be a simple MapPoint to record the
// difference in latitude and longitude.
event.setOldState(_mapPointOldState);
// By sending the current object as the new state we ensure any changes
// in the position are respected, we also keep object creation down.
// However, if it is important that the information in the new state
// is synchronous it may be better to send a copy of the data so it
// isn't overwritten while being read by the MapField.
event.setNewState(this);
_eventManager.triggerEvent(event);
}
/**
* @see net.rim.device.api.lbs.maps.model.DynamicMappable#getEventManager()
*/
public MappableEventManager getEventManager() {
return _eventManager;
}
}