@SuppressWarnings("unchecked")
private SimpleBlockFetcher() throws IOException {
int columns = file.readInt();
for (int i = 0; i < columns; i++) {
IColumn column = emptyColumnFamily.getColumnSerializer().deserialize(file);
if (reversed) blockColumns.addFirst(column);
else blockColumns.addLast(column);
/* see if we can stop seeking. */
boolean outOfBounds = false;
if (!reversed && finishColumn.remaining() > 0)
outOfBounds = comparator.compare(column.name(), finishColumn) >= 0;
else if (reversed && startColumn.remaining() > 0)
outOfBounds = comparator.compare(column.name(), startColumn) >= 0;
if (outOfBounds) break;
}
}
@SuppressWarnings("unchecked")
public boolean getNextBlock() throws IOException {
if (curRangeIndex < 0 || curRangeIndex >= indexes.size()) return false;
/* seek to the correct offset to the data, and calculate the data size */
IndexHelper.IndexInfo curColPosition = indexes.get(curRangeIndex);
/* see if this read is really necessary. */
if (reversed) {
if ((finishColumn.remaining() > 0
&& comparator.compare(finishColumn, curColPosition.lastName) > 0)
|| (startColumn.remaining() > 0
&& comparator.compare(startColumn, curColPosition.firstName) < 0)) return false;
} else {
if ((startColumn.remaining() > 0
&& comparator.compare(startColumn, curColPosition.lastName) > 0)
|| (finishColumn.remaining() > 0
&& comparator.compare(finishColumn, curColPosition.firstName) < 0)) return false;
}
boolean outOfBounds = false;
file.reset(mark);
FileUtils.skipBytesFully(file, curColPosition.offset);
while (file.bytesPastMark(mark) < curColPosition.offset + curColPosition.width
&& !outOfBounds) {
IColumn column = emptyColumnFamily.getColumnSerializer().deserialize(file);
if (reversed) blockColumns.addFirst(column);
else blockColumns.addLast(column);
/* see if we can stop seeking. */
if (!reversed && finishColumn.remaining() > 0)
outOfBounds = comparator.compare(column.name(), finishColumn) >= 0;
else if (reversed && startColumn.remaining() > 0)
outOfBounds = comparator.compare(column.name(), startColumn) >= 0;
}
if (reversed) curRangeIndex--;
else curRangeIndex++;
return true;
}
@SuppressWarnings("unchecked")
private boolean isColumnNeeded(IColumn column) {
if (startColumn.remaining() == 0 && finishColumn.remaining() == 0) return true;
else if (startColumn.remaining() == 0 && !reversed)
return comparator.compare(column.name(), finishColumn) <= 0;
else if (startColumn.remaining() == 0 && reversed)
return comparator.compare(column.name(), finishColumn) >= 0;
else if (finishColumn.remaining() == 0 && !reversed)
return comparator.compare(column.name(), startColumn) >= 0;
else if (finishColumn.remaining() == 0 && reversed)
return comparator.compare(column.name(), startColumn) <= 0;
else if (!reversed)
return comparator.compare(column.name(), startColumn) >= 0
&& comparator.compare(column.name(), finishColumn) <= 0;
else // if reversed
return comparator.compare(column.name(), startColumn) <= 0
&& comparator.compare(column.name(), finishColumn) >= 0;
}