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/*
* Copyright 2015 Amila Silva
*
* 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 org.traccar;
import java.math.BigDecimal;
import java.math.RoundingMode;
import org.traccar.helper.DistanceCalculator;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class DistanceHandler extends BaseDataHandler {
private Position getLastPosition(long deviceId) {
if (Context.getConnectionManager() != null) {
return Context.getConnectionManager().getLastPosition(deviceId);
}
return null;
}
public Position calculateDistance(Position position) {
double distance = 0.0;
Position last = getLastPosition(position.getDeviceId());
if (last != null) {
if (last.getAttributes().containsKey(Event.KEY_DISTANCE)) {
distance = ((Number) last.getAttributes().get(Event.KEY_DISTANCE)).doubleValue();
}
distance += DistanceCalculator.distance(
position.getLatitude(), position.getLongitude(),
last.getLatitude(), last.getLongitude());
distance = BigDecimal.valueOf(distance).setScale(2, RoundingMode.HALF_EVEN).doubleValue();
}
position.set(Event.KEY_DISTANCE, distance);
return position;
}
@Override
protected Position handlePosition(Position position) {
return calculateDistance(position);
}
}
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