How to use

getBytesPerTile

method

in

org.deegree.coverage.raster.io.grid.GridFileReader

@Override
protected void read( int columnId, int rowId, ByteBuffer buffer )
            throws IOException {
  int tileId = getTileId( columnId, rowId );
  long begin = System.currentTimeMillis();
  int tileInBlob = tileId % getTilesPerBlob();
  // transfer the data from the blob
  try {
    synchronized ( LOCK ) {
      FileChannel channel = getFileChannel();
      // MappedByteBuffer map = channel.map( MapMode.READ_ONLY, tileInBlob * getBytesPerTile(),
      // buffer.remaining() );
      // buffer.put( map );
      // map.
      // LOG.debug( "Tile id: {} -> pos in blob: {}", tileId, +tileInBlob );
      channel.position( tileInBlob * getBytesPerTile() );
      channel.read( buffer );
      closeReadStream();
    }
    // rewinding is not an option, buffer.rewind();
  } catch ( IOException e ) {
    LOG.error( "Error reading tile data from blob: " + e.getMessage(), e );
  }
  long elapsed = System.currentTimeMillis() - begin;
  if ( LOG.isDebugEnabled() ) {
    LOG.debug( "Loading of tile ({}x{}) in {} ms.", new Object[] { infoFile.getTileRasterWidth(),
                                   infoFile.getTileRasterHeight(), elapsed } );
  }
}

long filePos = ( ( tileId % getTilesPerBlob() ) * getBytesPerTile() );

int expectedTilesPerBlob = (int) ( gridFile.length() / getBytesPerTile() );
if ( getTilesPerBlob() != expectedTilesPerBlob ) {
  LOG.error( "the number of tiles in the blob are wrong." );