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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 java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.handler.codec.oneone.OneToOneDecoder;
import org.traccar.helper.DistanceCalculator;
import org.traccar.helper.Log;
import org.traccar.model.Event;
import org.traccar.model.Position;
public class FilterHandler extends OneToOneDecoder {
private boolean filterInvalid;
private boolean filterZero;
private boolean filterDuplicate;
private int filterDistance;
private long filterLimit;
private final Map<Long, Position> lastPositions = new HashMap<Long, Position>();
public FilterHandler(
boolean filterInvalid,
boolean filterZero,
boolean filterDuplicate,
int filterDistance,
long filterLimit) {
this.filterInvalid = filterInvalid;
this.filterZero = filterZero;
this.filterDuplicate = filterDuplicate;
this.filterDistance = filterDistance;
this.filterLimit = filterLimit;
}
public FilterHandler() {
Properties properties = Context.getProps();
String value = properties.getProperty("filter.invalid");
if (value != null) filterInvalid = Boolean.valueOf(value);
value = properties.getProperty("filter.zero");
if (value != null) filterZero = Boolean.valueOf(value);
value = properties.getProperty("filter.duplicate");
if (value != null) filterDuplicate = Boolean.valueOf(value);
value = properties.getProperty("filter.distance");
if (value != null) filterDistance = Integer.valueOf(value);
value = properties.getProperty("filter.limit");
if (value != null) filterLimit = Long.valueOf(value) * 1000;
}
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 = lastPositions.get(position.getDeviceId());
if (last != null) {
return position.getFixTime().equals(last.getFixTime());
} else {
return false;
}
} else {
return false;
}
}
private boolean filterDistance(Position position) {
if (filterDistance != 0) {
Position last = lastPositions.get(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 = lastPositions.get(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) ||
filterDistance(p);
if (filterLimit(p)) {
result = false;
}
if (!result) {
lastPositions.put(p.getDeviceId(), p);
} else {
StringBuilder s = new StringBuilder();
Log.info("Position filtered from " + p.getDeviceId());
}
return result;
}
@Override
protected Object decode(
ChannelHandlerContext ctx, Channel channel, Object msg)
throws Exception {
if (msg instanceof Position) {
if (filter((Position) msg)) {
return null;
}
} else if (msg instanceof List) {
Iterator<Position> i = ((List<Position>) msg).iterator();
while (i.hasNext()) {
if (filter(i.next())) {
i.remove();
}
}
}
return msg;
}
}
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