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/*
* Copyright 2015 Amila Silva
* Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
*
* 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 io.netty.channel.ChannelHandler;
import org.traccar.helper.DistanceCalculator;
import org.traccar.model.Position;
import java.math.BigDecimal;
import java.math.RoundingMode;
@ChannelHandler.Sharable
public class DistanceHandler extends BaseDataHandler {
private final boolean filter;
private final int coordinatesMinError;
private final int coordinatesMaxError;
public DistanceHandler(boolean filter, int coordinatesMinError, int coordinatesMaxError) {
this.filter = filter;
this.coordinatesMinError = coordinatesMinError;
this.coordinatesMaxError = coordinatesMaxError;
}
private Position getLastPosition(long deviceId) {
if (Context.getIdentityManager() != null) {
return Context.getIdentityManager().getLastPosition(deviceId);
}
return null;
}
@Override
protected Position handlePosition(Position position) {
double distance = 0.0;
if (position.getAttributes().containsKey(Position.KEY_DISTANCE)) {
distance = position.getDouble(Position.KEY_DISTANCE);
}
double totalDistance = 0.0;
Position last = getLastPosition(position.getDeviceId());
if (last != null) {
totalDistance = last.getDouble(Position.KEY_TOTAL_DISTANCE);
if (!position.getAttributes().containsKey(Position.KEY_DISTANCE)) {
distance = DistanceCalculator.distance(
position.getLatitude(), position.getLongitude(),
last.getLatitude(), last.getLongitude());
distance = BigDecimal.valueOf(distance).setScale(2, RoundingMode.HALF_EVEN).doubleValue();
}
if (filter && last.getValid() && last.getLatitude() != 0 && last.getLongitude() != 0) {
boolean satisfiesMin = coordinatesMinError == 0 || distance > coordinatesMinError;
boolean satisfiesMax = coordinatesMaxError == 0
|| distance < coordinatesMaxError || position.getValid();
if (!satisfiesMin || !satisfiesMax) {
position.setLatitude(last.getLatitude());
position.setLongitude(last.getLongitude());
distance = 0;
}
}
}
position.set(Position.KEY_DISTANCE, distance);
totalDistance = BigDecimal.valueOf(totalDistance + distance).setScale(2, RoundingMode.HALF_EVEN).doubleValue();
position.set(Position.KEY_TOTAL_DISTANCE, totalDistance);
return position;
}
}
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