1 files changed, 70 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/handler/events/FuelDropEventHandler.java b/src/main/java/org/traccar/handler/events/FuelDropEventHandler.java
new file mode 100644
index 000000000..59de61bba
--- /dev/null
+++ b/src/main/java/org/traccar/handler/events/FuelDropEventHandler.java
@@ -0,0 +1,70 @@
+/*
+ * 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;
+    }
+
+}