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/*
* 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;
import java.sql.SQLException;
import java.util.Date;
@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 boolean filterRelative;
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;
filterRelative = config.getBoolean(Keys.FILTER_RELATIVE);
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", "", false, true);
for (String attribute : attributesString.split("[ ,]")) {
if (position.getAttributes().containsKey(attribute)) {
return true;
}
}
}
return false;
}
private boolean filter(Position position) {
StringBuilder filterType = new StringBuilder();
// filter out invalid data
if (filterInvalid(position)) {
filterType.append("Invalid ");
}
if (filterZero(position)) {
filterType.append("Zero ");
}
if (filterFuture(position)) {
filterType.append("Future ");
}
if (filterAccuracy(position)) {
filterType.append("Accuracy ");
}
if (filterApproximate(position)) {
filterType.append("Approximate ");
}
// filter out excessive data
long deviceId = position.getDeviceId();
if (filterDuplicate || filterDistance > 0 || filterMaxSpeed > 0 || filterMinPeriod > 0) {
Position preceding = null;
if (filterRelative) {
try {
Date newFixTime = position.getFixTime();
preceding = Context.getDataManager().getPrecedingPosition(deviceId, newFixTime);
} catch (SQLException e) {
LOGGER.warn("Error retrieving preceding position; fallbacking to last received position.", e);
preceding = getLastReceivedPosition(deviceId);
}
} else {
preceding = getLastReceivedPosition(deviceId);
}
if (filterDuplicate(position, preceding)) {
filterType.append("Duplicate ");
}
if (filterStatic(position) && !skipLimit(position, preceding) && !skipAttributes(position)) {
filterType.append("Static ");
}
if (filterDistance(position, preceding) && !skipLimit(position, preceding) && !skipAttributes(position)) {
filterType.append("Distance ");
}
if (filterMaxSpeed(position, preceding)) {
filterType.append("MaxSpeed ");
}
if (filterMinPeriod(position, preceding)) {
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(deviceId).getUniqueId());
LOGGER.info(message.toString());
return true;
}
return false;
}
private Position getLastReceivedPosition(long deviceId) {
if (Context.getIdentityManager() != null) {
return Context.getIdentityManager().getLastPosition(deviceId);
}
return null;
}
@Override
protected Position handlePosition(Position position) {
if (filter(position)) {
return null;
}
return position;
}
}
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