Implement computed attributes

1 files changed, 47 insertions, 0 deletions

diff --git a/src/org/traccar/processing/CopyAttributesHandler.java b/src/org/traccar/processing/CopyAttributesHandler.java
new file mode 100644
index 000000000..3a96ca98d
--- /dev/null
+++ b/src/org/traccar/processing/CopyAttributesHandler.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2016 - 2017 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 - 2017 Andrey Kunitsyn (andrey@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.processing;
+
+import org.traccar.BaseDataHandler;
+import org.traccar.Context;
+import org.traccar.model.Position;
+
+public class CopyAttributesHandler extends BaseDataHandler {
+
+    private Position getLastPosition(long deviceId) {
+        if (Context.getIdentityManager() != null) {
+            return Context.getIdentityManager().getLastPosition(deviceId);
+        }
+        return null;
+    }
+
+    @Override
+    protected Position handlePosition(Position position) {
+        String attributesString = Context.getDeviceManager().lookupAttributeString(
+                position.getDeviceId(), "processing.copyAttributes", null, true);
+        Position last = getLastPosition(position.getDeviceId());
+        if (attributesString != null && last != null) {
+            for (String attribute : attributesString.split("[ ,]")) {
+                if (last.getAttributes().containsKey(attribute) && !position.getAttributes().containsKey(attribute)) {
+                    position.getAttributes().put(attribute, last.getAttributes().get(attribute));
+                }
+            }
+        }
+        return position;
+    }
+
+}