Updates pull request from Roman Tsypuk to convert the build system from

ant to gradle.  Removes linux and windows application launch scripts and
produces an executable jar with all resources included.

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

@@ -0,0 +1,168 @@
+/*******************************************************************************
+ * sdrtrunk
+ * Copyright (C) 2014-2017 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ ******************************************************************************/
+package io.github.dsheirer.map;
+
+import io.github.dsheirer.icon.IconManager;
+import io.github.dsheirer.message.Message;
+import io.github.dsheirer.sample.Listener;
+import io.github.dsheirer.alias.Alias;
+
+import java.awt.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Set;
+
+public class MapService implements Listener<Message>
+{
+    private int mMaxHistory = 2;
+    private int mCullThresholdMinutes = 60;
+
+    private static final Color sDEFAULT_COLOR = Color.BLACK;
+
+    private List<PlottableUpdateListener> mListeners = new ArrayList<PlottableUpdateListener>();
+
+    private HashMap<String, PlottableEntity> mEntities =
+        new HashMap<String, PlottableEntity>();
+
+    private IconManager mIconManager;
+
+    public MapService(IconManager resourceManager)
+    {
+        mIconManager = resourceManager;
+
+//		scheduler.scheduleAtFixedRate( new CullThread(), 5, 5, TimeUnit.MINUTES );		
+    }
+
+    /**
+     * Returns the max plottables (locations) history setting that is applied
+     * to all plottable entities
+     */
+    public int getMaxHistory()
+    {
+        return mMaxHistory;
+    }
+
+    /**
+     * Sets the max history trail for entities.  Value is applied to all newly
+     * created PlottableEntity and all existing entities.
+     */
+    public void setMaxHistory(int maxHistory)
+    {
+        mMaxHistory = maxHistory;
+
+        /**
+         * Update any existing entities with the new max history value
+         */
+        for(PlottableEntity entity : mEntities.values())
+        {
+            entity.setMaxHistory(mMaxHistory);
+        }
+    }
+
+    @Override
+    public void receive(Message message)
+    {
+        Plottable plottable = message.getPlottable();
+
+        if(plottable != null)
+        {
+            PlottableEntity entity = mEntities.get(plottable.getID());
+
+            if(entity == null)
+            {
+                Alias alias = plottable.getAlias();
+
+                Color color = null;
+
+                if(alias != null)
+                {
+                    color = alias.getDisplayColor();
+                }
+
+                if(color == null)
+                {
+                    color = sDEFAULT_COLOR;
+                }
+
+                entity = new PlottableEntity(plottable, color);
+
+                entity.setMaxHistory(mMaxHistory);
+
+                mEntities.put(plottable.getID(), entity);
+
+                for(PlottableUpdateListener listener : mListeners)
+                {
+                    listener.addPlottableEntity(entity);
+                }
+            }
+            else
+            {
+                entity.addPlottable(plottable);
+
+                for(PlottableUpdateListener listener : mListeners)
+                {
+                    listener.entitiesUpdated();
+                    ;
+                }
+            }
+        }
+    }
+
+    public void addListener(PlottableUpdateListener listener)
+    {
+        mListeners.add(listener);
+    }
+
+    public void removeListener(PlottableUpdateListener listener)
+    {
+        mListeners.remove(listener);
+    }
+
+    public class CullThread implements Runnable
+    {
+        @Override
+        public void run()
+        {
+            long cutoffTime = System.currentTimeMillis() -
+                (mCullThresholdMinutes * 1000);
+
+            Set<String> ids = Collections.unmodifiableSet(mEntities.keySet());
+
+            for(String id : ids)
+            {
+                PlottableEntity entity = mEntities.get(id);
+
+                if(entity.getCurrentPlottable().getTimestamp() < cutoffTime)
+                {
+                    mEntities.remove(id);
+
+                    /**
+                     * Let all listeners know we've removed (culled) an entity
+                     */
+                    for(PlottableUpdateListener listener : mListeners)
+                    {
+                        listener.removePlottableEntity(entity);
+                    }
+                }
+            }
+        }
+    }
+}