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/*
* Copyright 2014 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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;
import org.traccar.helper.DistanceCalculator;
import org.traccar.helper.Log;
import org.traccar.model.Position;
public class FilterHandler extends BaseDataHandler {
private static final long FILTER_FUTURE_LIMIT = 5 * 60 * 1000;
private final boolean filterInvalid;
private final boolean filterZero;
private final boolean filterDuplicate;
private final boolean filterFuture;
private final boolean filterApproximate;
private final int filterDistance;
private final long filterLimit;
public FilterHandler(
boolean filterInvalid, boolean filterZero, boolean filterDuplicate, boolean filterFuture,
boolean filterApproximate, int filterDistance, long filterLimit) {
this.filterInvalid = filterInvalid;
this.filterZero = filterZero;
this.filterDuplicate = filterDuplicate;
this.filterDistance = filterDistance;
this.filterFuture = filterFuture;
this.filterApproximate = filterApproximate;
this.filterLimit = filterLimit;
}
public FilterHandler() {
Config config = Context.getConfig();
filterInvalid = config.getBoolean("filter.invalid");
filterZero = config.getBoolean("filter.zero");
filterDuplicate = config.getBoolean("filter.duplicate");
filterFuture = config.getBoolean("filter.future");
filterApproximate = config.getBoolean("filter.approximate");
filterDistance = config.getInteger("filter.distance");
filterLimit = config.getLong("filter.limit") * 1000;
}
private Position getLastPosition(long deviceId) {
if (Context.getIdentityManager() != null) {
return Context.getIdentityManager().getLastPosition(deviceId);
}
return null;
}
private boolean filterInvalid(Position position) {
return filterInvalid && !position.getValid();
}
private boolean filterZero(Position position) {
return filterZero && position.getLatitude() == 0.0 && position.getLongitude() == 0.0;
}
private boolean filterDuplicate(Position position) {
if (filterDuplicate) {
Position last = getLastPosition(position.getDeviceId());
if (last != null) {
return position.getFixTime().equals(last.getFixTime());
} else {
return false;
}
} else {
return false;
}
}
private boolean filterFuture(Position position) {
return filterFuture && position.getFixTime().getTime() > System.currentTimeMillis() + FILTER_FUTURE_LIMIT;
}
private boolean filterApproximate(Position position) {
Boolean approximate = (Boolean) position.getAttributes().get(Position.KEY_APPROXIMATE);
return filterApproximate && approximate != null && approximate;
}
private boolean filterDistance(Position position) {
if (filterDistance != 0) {
Position last = getLastPosition(position.getDeviceId());
if (last != null) {
double distance = DistanceCalculator.distance(
position.getLatitude(), position.getLongitude(),
last.getLatitude(), last.getLongitude());
return distance < filterDistance;
} else {
return false;
}
} else {
return false;
}
}
private boolean filterLimit(Position position) {
if (filterLimit != 0) {
Position last = getLastPosition(position.getDeviceId());
if (last != null) {
return (position.getFixTime().getTime() - last.getFixTime().getTime()) > filterLimit;
} else {
return false;
}
} else {
return false;
}
}
private boolean filter(Position p) {
boolean result = filterInvalid(p) || filterZero(p) || filterDuplicate(p)
|| filterFuture(p) || filterApproximate(p) || filterDistance(p);
if (filterLimit(p)) {
result = false;
}
if (result) {
Log.info("Position filtered from " + p.getDeviceId());
}
return result;
}
@Override
protected Position handlePosition(Position position) {
if (filter(position)) {
return null;
}
return position;
}
}
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