/** Returns the following block. */
public boolean nextBlock() throws IOException {
byte[] buffer = _buffer;
Block block = _block;
_block = null;
_buffer = null;
if (block != null) {
block.free();
}
_blockId = _table.firstRowBlock(_blockId + Table.BLOCK_SIZE);
if (_blockId < 0) {
return false;
}
block = _xa.readBlock(_table, _blockId);
buffer = block.getBuffer();
_block = block;
_buffer = buffer;
_rowOffset = 0;
return true;
}
/** Sets the next row. */
public void setRow(long rowAddr) throws IOException {
long blockId = _table.addressToBlockId(rowAddr);
if (blockId != _blockId) {
_blockId = blockId;
Block block = _block;
_block = null;
_buffer = null;
if (block != null) {
block.free();
}
_block = _xa.readBlock(_table, _blockId);
_buffer = _block.getBuffer();
}
_rowOffset = (int) (rowAddr & BlockStore.BLOCK_OFFSET_MASK);
}