Refactor distance handler

1 files changed, 82 insertions, 0 deletions

diff --git a/src/org/traccar/handler/DistanceHandler.java b/src/org/traccar/handler/DistanceHandler.java
new file mode 100644
index 000000000..a336a884e
--- /dev/null
+++ b/src/org/traccar/handler/DistanceHandler.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2015 Amila Silva
+ * Copyright 2016 - 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;
+
+import io.netty.channel.ChannelHandler;
+import org.traccar.BaseDataHandler;
+import org.traccar.config.Config;
+import org.traccar.config.Keys;
+import org.traccar.database.IdentityManager;
+import org.traccar.helper.DistanceCalculator;
+import org.traccar.model.Position;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
+@ChannelHandler.Sharable
+public class DistanceHandler extends BaseDataHandler {
+
+    private final IdentityManager identityManager;
+
+    private final boolean filter;
+    private final int coordinatesMinError;
+    private final int coordinatesMaxError;
+
+    public DistanceHandler(Config config, IdentityManager identityManager) {
+        this.identityManager = identityManager;
+        this.filter = config.getBoolean(Keys.COORDINATES_FILTER);
+        this.coordinatesMinError = config.getInteger(Keys.COORDINATES_MIN_ERROR);
+        this.coordinatesMaxError = config.getInteger(Keys.COORDINATES_MAX_ERROR);
+    }
+
+    @Override
+    protected Position handlePosition(Position position) {
+
+        double distance = 0.0;
+        if (position.getAttributes().containsKey(Position.KEY_DISTANCE)) {
+            distance = position.getDouble(Position.KEY_DISTANCE);
+        }
+        double totalDistance = 0.0;
+
+        Position last = identityManager != null ? identityManager.getLastPosition(position.getDeviceId()) : null;
+        if (last != null) {
+            totalDistance = last.getDouble(Position.KEY_TOTAL_DISTANCE);
+            if (!position.getAttributes().containsKey(Position.KEY_DISTANCE)) {
+                distance = DistanceCalculator.distance(
+                        position.getLatitude(), position.getLongitude(),
+                        last.getLatitude(), last.getLongitude());
+                distance = BigDecimal.valueOf(distance).setScale(2, RoundingMode.HALF_EVEN).doubleValue();
+            }
+            if (filter && last.getValid() && last.getLatitude() != 0 && last.getLongitude() != 0) {
+                boolean satisfiesMin = coordinatesMinError == 0 || distance > coordinatesMinError;
+                boolean satisfiesMax = coordinatesMaxError == 0
+                        || distance < coordinatesMaxError || position.getValid();
+                if (!satisfiesMin || !satisfiesMax) {
+                    position.setLatitude(last.getLatitude());
+                    position.setLongitude(last.getLongitude());
+                    distance = 0;
+                }
+            }
+        }
+        position.set(Position.KEY_DISTANCE, distance);
+        totalDistance = BigDecimal.valueOf(totalDistance + distance).setScale(2, RoundingMode.HALF_EVEN).doubleValue();
+        position.set(Position.KEY_TOTAL_DISTANCE, totalDistance);
+
+        return position;
+    }
+
+}