public boolean hasTile(final long pMapTileIndex) {
        ITileSource tileSource = mTileSource.get();
        if (tileSource == null) {
            return false;
        }
        return mWriter.getExpirationTimestamp(tileSource, pMapTileIndex) != null;
    }
public boolean hasTile ( final long pMapTileIndex ) { ITileSource tileSource = mTileSource . get ( ) ; if ( tileSource == null ) { return false ; } return mWriter . getExpirationTimestamp ( tileSource , pMapTileIndex ) != null ; }
returns true if the given tile for the current map source exists in the cache db