/*
* Copyright 2010-2011 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.
*/
package blackberry.system.event;
import blackberry.system.event.ISystemEventListener;
import net.rim.device.api.system.CoverageInfo;
import net.rim.device.api.system.CoverageStatusListener;
/**
* Coverage listener implementation. Proxy for system coverage listener that
* notifies manager generically of coverage change events.
*
* @author ababut
*/
public class CoverageChangeHandler {
private ISystemEventListener _manager;
private CoverageStatusListener _currentCoverageMonitor;
CoverageChangeHandler(ISystemEventListener manager) {
_manager = manager;
}
/**
* Creates a listener if not present and registers it.
*
*/
public void listen() {
if( _currentCoverageMonitor == null ) {
_currentCoverageMonitor = new CoverageStatusListener() {
public void coverageStatusChanged( int newCoverage ) {
//Notify manager of coverage changed event
//TODO: Add new coverage to the event argument if JS cares about it
_manager.onSystemEvent(_manager.EVENT_COV_CHANGE, "");
}
};
CoverageInfo.addListener(_currentCoverageMonitor);
}
}
/**
* Removes system listener if present.
*
*/
public void stopListening() {
if(_currentCoverageMonitor != null) {
CoverageInfo.removeListener(_currentCoverageMonitor);
//Explicitly null it out to avoid memory leaks
_currentCoverageMonitor = null;
}
}
/**
* Indicates listener status
*
* @return true if listener is active
*/
public boolean isListening() {
return (_currentCoverageMonitor != null);
}
}