1 files changed, 56 insertions, 0 deletions
diff --git a/src/org/traccar/handler/events/AlertEventHandler.java b/src/org/traccar/handler/events/AlertEventHandler.java
new file mode 100644
index 000000000..c6d61538b
--- /dev/null
+++ b/src/org/traccar/handler/events/AlertEventHandler.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2016 - 2018 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 java.util.Collections;
+import java.util.Map;
+
+import io.netty.channel.ChannelHandler;
+import org.traccar.BaseEventHandler;
+import org.traccar.Context;
+import org.traccar.model.Event;
+import org.traccar.model.Position;
+
+@ChannelHandler.Sharable
+public class AlertEventHandler extends BaseEventHandler {
+
+    private final boolean ignoreDuplicateAlerts;
+
+    public AlertEventHandler() {
+        ignoreDuplicateAlerts = Context.getConfig().getBoolean("event.ignoreDuplicateAlerts");
+    }
+
+    @Override
+    protected Map<Event, Position> analyzePosition(Position position) {
+        Object alarm = position.getAttributes().get(Position.KEY_ALARM);
+        if (alarm != null) {
+            boolean ignoreAlert = false;
+            if (ignoreDuplicateAlerts) {
+                Position lastPosition = Context.getIdentityManager().getLastPosition(position.getDeviceId());
+                if (lastPosition != null && alarm.equals(lastPosition.getAttributes().get(Position.KEY_ALARM))) {
+                    ignoreAlert = true;
+                }
+            }
+            if (!ignoreAlert) {
+                Event event = new Event(Event.TYPE_ALARM, position.getDeviceId(), position.getId());
+                event.set(Position.KEY_ALARM, (String) alarm);
+                return Collections.singletonMap(event, position);
+            }
+        }
+        return null;
+    }
+
+}