/* * Copyright 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.events; import org.traccar.BaseEventHandler; import org.traccar.Context; import org.traccar.model.Device; import org.traccar.model.Event; import org.traccar.model.Position; import java.util.Collections; import java.util.Map; public class FuelDropEventHandler extends BaseEventHandler { public static final String ATTRIBUTE_FUEL_DROP_THRESHOLD = "fuelDropThreshold"; @Override protected Map<Event, Position> analyzePosition(Position position) { Device device = Context.getIdentityManager().getById(position.getDeviceId()); if (device == null) { return null; } if (!Context.getIdentityManager().isLatestPosition(position)) { return null; } double fuelDropThreshold = Context.getDeviceManager() .lookupAttributeDouble(device.getId(), ATTRIBUTE_FUEL_DROP_THRESHOLD, 0, false); if (fuelDropThreshold > 0) { Position lastPosition = Context.getIdentityManager().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; } }