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Diffstat (limited to 'src/org/traccar/FilterHandler.java')
-rw-r--r-- | src/org/traccar/FilterHandler.java | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/org/traccar/FilterHandler.java b/src/org/traccar/FilterHandler.java new file mode 100644 index 000000000..18ae2ecae --- /dev/null +++ b/src/org/traccar/FilterHandler.java @@ -0,0 +1,133 @@ +/* + * 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.Position; + +public class FilterHandler extends OneToOneDecoder { + + private boolean filterInvalid; + private boolean filterZero; + private boolean filterDuplicate; + private int filterDistance; + + private final Map<Long, Position> lastPositions = new HashMap<Long, Position>(); + + public FilterHandler(ServerManager serverManager) { + Properties properties = serverManager.getProperties(); + + 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); + } + + 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.getTime().equals(last.getTime()); + } 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 filter(Position p) { + + boolean result = + filterInvalid(p) || + filterZero(p) || + filterDuplicate(p) || + filterDistance(p); + + 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; + } + +} |