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/*
* Copyright 2017 - 2019 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.handler.events;
import io.netty.channel.ChannelHandler;
import org.traccar.database.IdentityManager;
import org.traccar.model.Device;
import org.traccar.model.Event;
import org.traccar.model.Position;
import java.util.Collections;
import java.util.Map;
@ChannelHandler.Sharable
public class FuelDropEventHandler extends BaseEventHandler {
public static final String ATTRIBUTE_FUEL_DROP_THRESHOLD = "fuelDropThreshold";
private final IdentityManager identityManager;
public FuelDropEventHandler(IdentityManager identityManager) {
this.identityManager = identityManager;
}
@Override
protected Map<Event, Position> analyzePosition(Position position) {
Device device = identityManager.getById(position.getDeviceId());
if (device == null) {
return null;
}
if (!identityManager.isLatestPosition(position)) {
return null;
}
double fuelDropThreshold = identityManager
.lookupAttributeDouble(device.getId(), ATTRIBUTE_FUEL_DROP_THRESHOLD, 0, false);
if (fuelDropThreshold > 0) {
Position lastPosition = identityManager.getLastPosition(position.getDeviceId());
if (position.getAttributes().containsKey(Position.KEY_FUEL_LEVEL)
&& lastPosition != null && lastPosition.getAttributes().containsKey(Position.KEY_FUEL_LEVEL)) {
double drop = lastPosition.getDouble(Position.KEY_FUEL_LEVEL)
- position.getDouble(Position.KEY_FUEL_LEVEL);
if (drop >= fuelDropThreshold) {
Event event = new Event(Event.TYPE_DEVICE_FUEL_DROP, position.getDeviceId(), position.getId());
event.set(ATTRIBUTE_FUEL_DROP_THRESHOLD, fuelDropThreshold);
return Collections.singletonMap(event, position);
}
}
}
return null;
}
}
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