TileLoader/TileDataSource: add cancel() method

- used to force closing sockets when changing theme or tilesource

vtm-web/src/org/oscim/gdx/emu/org/oscim/layers/tile/TileLoader.java

@@ -40,17 +40,22 @@ public abstract class TileLoader implements ITileDataSink {
 		mTileManager = tileManager;
 	}
 
-	public abstract void cleanup();
+	public abstract void dispose();
 
 	protected abstract boolean loadTile(MapTile tile);
 
 	boolean isInterrupted;
 
-	public void interrupt() {
+	public void finish() {
 		isInterrupted = true;
 		// cancel loading
 	}
 
+	public void cancel() {
+		isInterrupted = true;
+		// cancel loading... ?
+	}
+
 	boolean mPausing;
 
 	public boolean isCanceled() {

vtm-web/src/org/oscim/gdx/emu/org/oscim/tiling/source/UrlTileDataSource.java

@@ -84,7 +84,13 @@ public class UrlTileDataSource implements ITileDataSource {
 	}
 
 	@Override
-	public void destroy() {
+	public void dispose() {
 		mConn.close();
 	}
+
+	@Override
+	public void cancel() {
+		mConn.close();
+	}
+
 }

vtm-web/src/org/oscim/gdx/emu/org/oscim/tiling/source/bitmap/BitmapTileSource.java

@@ -126,7 +126,12 @@ public class BitmapTileSource extends UrlTileSource {
 		}
 
 		@Override
-		public void destroy() {
+		public void dispose() {
 		}
+
+		@Override
+		public void cancel() {
+		}
+
 	}
 }

vtm-web/src/org/oscim/tiling/source/JsonTileDataSource.java

@@ -72,7 +72,12 @@ public class JsonTileDataSource implements ITileDataSource {
 	boolean mFinished;
 
 	@Override
-	public void destroy() {
+	public void dispose() {
+		mFinished = true;
+	}
+
+	@Override
+	public void cancel() {
 		mFinished = true;
 	}