1 files changed, 206 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/handler/FilterHandler.java b/src/main/java/org/traccar/handler/FilterHandler.java
new file mode 100644
index 000000000..dceaede01
--- /dev/null
+++ b/src/main/java/org/traccar/handler/FilterHandler.java
@@ -0,0 +1,206 @@
+/*
+ * Copyright 2014 - 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;
+
+import io.netty.channel.ChannelHandler;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.traccar.BaseDataHandler;
+import org.traccar.Context;
+import org.traccar.config.Config;
+import org.traccar.config.Keys;
+import org.traccar.helper.UnitsConverter;
+import org.traccar.model.Position;
+
+@ChannelHandler.Sharable
+public class FilterHandler extends BaseDataHandler {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(FilterHandler.class);
+
+    private boolean filterInvalid;
+    private boolean filterZero;
+    private boolean filterDuplicate;
+    private long filterFuture;
+    private boolean filterApproximate;
+    private int filterAccuracy;
+    private boolean filterStatic;
+    private int filterDistance;
+    private int filterMaxSpeed;
+    private long filterMinPeriod;
+    private long skipLimit;
+    private boolean skipAttributes;
+
+    public FilterHandler(Config config) {
+        filterInvalid = config.getBoolean(Keys.FILTER_INVALID);
+        filterZero = config.getBoolean(Keys.FILTER_ZERO);
+        filterDuplicate = config.getBoolean(Keys.FILTER_DUPLICATE);
+        filterFuture = config.getLong(Keys.FILTER_FUTURE) * 1000;
+        filterAccuracy = config.getInteger(Keys.FILTER_ACCURACY);
+        filterApproximate = config.getBoolean(Keys.FILTER_APPROXIMATE);
+        filterStatic = config.getBoolean(Keys.FILTER_STATIC);
+        filterDistance = config.getInteger(Keys.FILTER_DISTANCE);
+        filterMaxSpeed = config.getInteger(Keys.FILTER_MAX_SPEED);
+        filterMinPeriod = config.getInteger(Keys.FILTER_MIN_PERIOD) * 1000;
+        skipLimit = config.getLong(Keys.FILTER_SKIP_LIMIT) * 1000;
+        skipAttributes = config.getBoolean(Keys.FILTER_SKIP_ATTRIBUTES_ENABLE);
+    }
+
+    private boolean filterInvalid(Position position) {
+        return filterInvalid && (!position.getValid()
+           || position.getLatitude() > 90 || position.getLongitude() > 180
+           || position.getLatitude() < -90 || position.getLongitude() < -180);
+    }
+
+    private boolean filterZero(Position position) {
+        return filterZero && position.getLatitude() == 0.0 && position.getLongitude() == 0.0;
+    }
+
+    private boolean filterDuplicate(Position position, Position last) {
+        if (filterDuplicate && last != null && position.getFixTime().equals(last.getFixTime())) {
+            for (String key : position.getAttributes().keySet()) {
+                if (!last.getAttributes().containsKey(key)) {
+                    return false;
+                }
+            }
+            return true;
+        }
+        return false;
+    }
+
+    private boolean filterFuture(Position position) {
+        return filterFuture != 0 && position.getFixTime().getTime() > System.currentTimeMillis() + filterFuture;
+    }
+
+    private boolean filterAccuracy(Position position) {
+        return filterAccuracy != 0 && position.getAccuracy() > filterAccuracy;
+    }
+
+    private boolean filterApproximate(Position position) {
+        return filterApproximate && position.getBoolean(Position.KEY_APPROXIMATE);
+    }
+
+    private boolean filterStatic(Position position) {
+        return filterStatic && position.getSpeed() == 0.0;
+    }
+
+    private boolean filterDistance(Position position, Position last) {
+        if (filterDistance != 0 && last != null) {
+            return position.getDouble(Position.KEY_DISTANCE) < filterDistance;
+        }
+        return false;
+    }
+
+    private boolean filterMaxSpeed(Position position, Position last) {
+        if (filterMaxSpeed != 0 && last != null) {
+            double distance = position.getDouble(Position.KEY_DISTANCE);
+            double time = position.getFixTime().getTime() - last.getFixTime().getTime();
+            return UnitsConverter.knotsFromMps(distance / (time / 1000)) > filterMaxSpeed;
+        }
+        return false;
+    }
+
+    private boolean filterMinPeriod(Position position, Position last) {
+        if (filterMinPeriod != 0 && last != null) {
+            long time = position.getFixTime().getTime() - last.getFixTime().getTime();
+            return time > 0 && time < filterMinPeriod;
+        }
+        return false;
+    }
+
+    private boolean skipLimit(Position position, Position last) {
+        if (skipLimit != 0 && last != null) {
+            return (position.getServerTime().getTime() - last.getServerTime().getTime()) > skipLimit;
+        }
+        return false;
+    }
+
+    private boolean skipAttributes(Position position) {
+        if (skipAttributes) {
+            String attributesString = Context.getIdentityManager().lookupAttributeString(
+                    position.getDeviceId(), "filter.skipAttributes", "", true);
+            for (String attribute : attributesString.split("[ ,]")) {
+                if (position.getAttributes().containsKey(attribute)) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+
+    private boolean filter(Position position) {
+
+        StringBuilder filterType = new StringBuilder();
+
+        Position last = null;
+        if (Context.getIdentityManager() != null) {
+            last = Context.getIdentityManager().getLastPosition(position.getDeviceId());
+        }
+
+        if (filterInvalid(position)) {
+            filterType.append("Invalid ");
+        }
+        if (filterZero(position)) {
+            filterType.append("Zero ");
+        }
+        if (filterDuplicate(position, last) && !skipLimit(position, last) && !skipAttributes(position)) {
+            filterType.append("Duplicate ");
+        }
+        if (filterFuture(position)) {
+            filterType.append("Future ");
+        }
+        if (filterAccuracy(position)) {
+            filterType.append("Accuracy ");
+        }
+        if (filterApproximate(position)) {
+            filterType.append("Approximate ");
+        }
+        if (filterStatic(position) && !skipLimit(position, last) && !skipAttributes(position)) {
+            filterType.append("Static ");
+        }
+        if (filterDistance(position, last) && !skipLimit(position, last) && !skipAttributes(position)) {
+            filterType.append("Distance ");
+        }
+        if (filterMaxSpeed(position, last)) {
+            filterType.append("MaxSpeed ");
+        }
+        if (filterMinPeriod(position, last)) {
+            filterType.append("MinPeriod ");
+        }
+
+        if (filterType.length() > 0) {
+
+            StringBuilder message = new StringBuilder();
+            message.append("Position filtered by ");
+            message.append(filterType.toString());
+            message.append("filters from device: ");
+            message.append(Context.getIdentityManager().getById(position.getDeviceId()).getUniqueId());
+
+            LOGGER.info(message.toString());
+            return true;
+        }
+
+        return false;
+    }
+
+    @Override
+    protected Position handlePosition(Position position) {
+        if (filter(position)) {
+            return null;
+        }
+        return position;
+    }
+
+}