mirror of
https://github.com/DSheirer/sdrtrunk.git
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132 lines
4.0 KiB
Java
132 lines
4.0 KiB
Java
/*
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* *****************************************************************************
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* Copyright (C) 2014-2024 Dennis Sheirer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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* ****************************************************************************
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*/
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package io.github.dsheirer.map;
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import io.github.dsheirer.identifier.Identifier;
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import io.github.dsheirer.identifier.IdentifierCollection;
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import io.github.dsheirer.module.decode.event.PlottableDecodeEvent;
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import java.util.ArrayList;
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import java.util.List;
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import org.jdesktop.swingx.mapviewer.GeoPosition;
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/**
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* Plottable entity history with location history.
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*/
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public class PlottableEntityHistory
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{
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public static final int MAX_LOCATION_HISTORY = 10;
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private List<TimestampedGeoPosition> mLocationHistory = new ArrayList<>();
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private PlottableDecodeEvent mCurrentEvent;
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private Identifier mIdentifier;
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/**
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* Constructs a plottable entity history
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*/
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public PlottableEntityHistory(Identifier identifier, PlottableDecodeEvent event)
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{
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mIdentifier = identifier;
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add(event);
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}
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/**
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* Location history for this entity
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*/
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public List<TimestampedGeoPosition> getLocationHistory()
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{
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return new ArrayList<>(mLocationHistory);
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}
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/**
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* Latest position for this entity.
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*/
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public TimestampedGeoPosition getLatestPosition()
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{
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if(mLocationHistory.size() > 0)
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{
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return mLocationHistory.get(0);
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}
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return null;
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}
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/**
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* Identifier for this plottable
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*/
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public Identifier getIdentifier()
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{
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return mIdentifier;
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}
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/**
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* Identifier collection from the latest event for this plottable
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*/
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public IdentifierCollection getIdentifierCollection()
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{
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return mCurrentEvent.getIdentifierCollection();
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}
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/**
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* Updates the entity history with a location from the latest decode event
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*/
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public void add(PlottableDecodeEvent event)
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{
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if(event.isValidLocation())
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{
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TimestampedGeoPosition mostRecentPosition = getLatestPosition();
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TimestampedGeoPosition latest = new TimestampedGeoPosition(event.getLocation(), event.getTimeStart());
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if(isUnique(latest, mostRecentPosition))
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{
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mCurrentEvent = event;
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mLocationHistory.add(0, latest);
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while(mLocationHistory.size() > MAX_LOCATION_HISTORY)
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{
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mLocationHistory.remove(mLocationHistory.size() - 1);
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}
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}
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}
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}
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/**
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* Indicates if the latest time and position is at least 30 seconds newer than the previous position and either the
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* latitude or longitude differs by at least 0.00001 degrees.
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* @param latest location
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* @param previous location
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* @return indication of uniqueness.
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*/
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private boolean isUnique(TimestampedGeoPosition latest, TimestampedGeoPosition previous)
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{
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if(latest != null && previous == null)
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{
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return true;
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}
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if(latest != null && previous != null)
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{
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return latest.getTimestamp() > (previous.getTimestamp() + 30_000) ||
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Math.abs(latest.getLatitude() - previous.getLatitude()) > 0.00001 ||
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Math.abs(latest.getLongitude() - previous.getLongitude()) > 0.00001;
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}
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return false;
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}
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}
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