#1924 Resolves issue with talker GPS positions showing up in map panel as user identifiers. (#1925)

Co-authored-by: sheirerd <sheirerd@ainfosec.com>

src/main/java/io/github/dsheirer/map/MapPanel.java

@@ -468,7 +468,7 @@ public class MapPanel extends JPanel implements IPlottableUpdateListener
         if(mPlottedTracksTable == null)
         {
             mPlottedTracksTable = new JTable(mMapService.getPlottableEntityModel());
-
+            mPlottedTracksTable.setAutoCreateRowSorter(true);
             mMapService.getPlottableEntityModel().addTableModelListener(e ->
             {
                 //Update the followed entity for DELETE/UPDATE operations

src/main/java/io/github/dsheirer/map/PlottableEntityHistory.java

@@ -87,12 +87,42 @@ public class PlottableEntityHistory
      */
     public void add(PlottableDecodeEvent event)
     {
-        mCurrentEvent = event;
+        TimestampedGeoPosition mostRecentPosition = getLatestPosition();
-        mLocationHistory.add(0, new TimestampedGeoPosition(event.getLocation(), event.getTimeStart()));
+        TimestampedGeoPosition latest = new TimestampedGeoPosition(event.getLocation(), event.getTimeStart());
 
-        while(mLocationHistory.size() > MAX_LOCATION_HISTORY)
+        if(isUnique(latest, mostRecentPosition))
         {
-            mLocationHistory.remove(mLocationHistory.size() - 1);
+            mCurrentEvent = event;
+            mLocationHistory.add(0, latest);
+
+            while(mLocationHistory.size() > MAX_LOCATION_HISTORY)
+            {
+                mLocationHistory.remove(mLocationHistory.size() - 1);
+            }
         }
     }
+
+    /**
+     * Indicates if the latest time and position is at least 30 seconds newer than the previous position and either the
+     * latitude or longitude differs by at least 0.00001 degrees.
+     * @param latest location
+     * @param previous location
+     * @return indication of uniqueness.
+     */
+    private boolean isUnique(TimestampedGeoPosition latest, TimestampedGeoPosition previous)
+    {
+        if(latest != null && previous == null)
+        {
+            return true;
+        }
+
+        if(latest != null && previous != null)
+        {
+            return latest.getTimestamp() > (previous.getTimestamp() + 30_000) ||
+                   Math.abs(latest.getLatitude() - previous.getLatitude()) > 0.00001 ||
+                   Math.abs(latest.getLongitude() - previous.getLongitude()) > 0.00001;
+        }
+
+        return false;
+    }
 }

src/main/java/io/github/dsheirer/map/PlottableEntityModel.java

@@ -22,6 +22,7 @@ package io.github.dsheirer.map;
 import io.github.dsheirer.alias.Alias;
 import io.github.dsheirer.alias.AliasList;
 import io.github.dsheirer.alias.AliasModel;
+import io.github.dsheirer.identifier.Form;
 import io.github.dsheirer.identifier.Identifier;
 import io.github.dsheirer.identifier.configuration.AliasListConfigurationIdentifier;
 import io.github.dsheirer.module.decode.event.PlottableDecodeEvent;
@@ -104,7 +105,7 @@ public class PlottableEntityModel extends AbstractTableModel implements Listener
         EventQueue.invokeLater(() -> {
             Identifier from = plottableDecodeEvent.getIdentifierCollection().getFromIdentifier();
 
-            if(from != null)
+            if(from != null && from.getForm() != Form.LOCATION)
             {
                 AliasListConfigurationIdentifier aliasList = plottableDecodeEvent.getIdentifierCollection().getAliasListConfiguration();
                 String key = (aliasList != null ? aliasList.toString() : KEY_NO_ALIAS_LIST) + from;

src/main/java/io/github/dsheirer/module/decode/p25/phase2/P25P2DecoderState.java

@@ -40,6 +40,7 @@ import io.github.dsheirer.identifier.patch.PatchGroupPreLoadDataContent;
 import io.github.dsheirer.log.LoggingSuppressor;
 import io.github.dsheirer.message.IMessage;
 import io.github.dsheirer.module.decode.DecoderType;
+import io.github.dsheirer.module.decode.event.DecodeEvent;
 import io.github.dsheirer.module.decode.event.DecodeEventType;
 import io.github.dsheirer.module.decode.event.PlottableDecodeEvent;
 import io.github.dsheirer.module.decode.p25.IServiceOptionsProvider;
@@ -1523,13 +1524,14 @@ public class P25P2DecoderState extends TimeslotDecoderState implements Identifie
                 collection.update(fromRadio);
             }
 
-            broadcast(PlottableDecodeEvent.plottableBuilder(DecodeEventType.GPS, message.getTimestamp())
+            DecodeEvent decodeEvent = PlottableDecodeEvent.plottableBuilder(DecodeEventType.GPS, message.getTimestamp())
                     .protocol(Protocol.APCO25)
                     .location(gps.getGeoPosition()).channel(getCurrentChannel()).details("LOCATION: " +
                             gps.getLocation().toString())
                     .identifiers(collection)
-                    .build());
+                    .build();
-
+            broadcast(decodeEvent);
+            mTrafficChannelManager.broadcast(decodeEvent);
             mTrafficChannelManager.processP2CurrentUser(getCurrentFrequency(), getTimeslot(), gps.getLocation(),
                     message.getTimestamp());
         }