/**
* Converts TMS tile coordinates to QuadTree
*
* @param aTile The tile coordinates to convert
* @return The QuadTree as String.
*/
protected String quadTree(final MapTile aTile) {
final StringBuilder quadKey = new StringBuilder();
for (int i = aTile.getZoomLevel(); i > 0; i--) {
int digit = 0;
final int mask = 1 << (i - 1);
if ((aTile.getX() & mask) != 0) digit += 1;
if ((aTile.getY() & mask) != 0) digit += 2;
quadKey.append("" + digit);
}
return quadKey.toString();
}
public byte[] getImage(final ITileSource pTileSource, final MapTile pTile) {
try {
byte[] bits = null;
final String[] tile = {COLUMN_TILE};
final long x = (long) pTile.getX();
final long y = (long) pTile.getY();
final long z = (long) pTile.getZoomLevel();
final long index = ((z << z) + x << z) + y;
final Cursor cur =
mDatabase.query(
TABLE,
tile,
COLUMN_KEY
+ " = "
+ index
+ " and "
+ COLUMN_PROVIDER
+ " = '"
+ pTileSource.name()
+ "'",
null,
null,
null,
null);
if (cur.getCount() != 0) {
cur.moveToFirst();
bits = (cur.getBlob(0));
}
cur.close();
if (bits != null) {
return bits;
}
} catch (final Throwable e) {
Log.w(IMapView.LOGTAG, "Error getting db stream: " + pTile, e);
}
return null;
}