/**
* Load all of the rows from the supplied sequence into the buffer.
*
* @param sequence the node sequence; may not be null
* @param extractor the extractor for the sortable value; may not be null
* @param rowsWithNullKey the buffer into which should be placed all rows for which the extracted
* key value is null; may be null if these are not to be kept
* @return the size of the first batch, or 0 if there are no rows found
*/
protected int loadAll(
NodeSequence sequence,
ExtractFromRow extractor,
DistinctBuffer<BufferedRow> rowsWithNullKey) {
// Put all of the batches from the sequence into the buffer
Batch batch = sequence.nextBatch();
int batchSize = 0;
Object value = null;
while (batch != null && batchSize == 0) {
while (batch.hasNext()) {
batch.nextRow();
value = extractor.getValueInRow(batch);
if (value instanceof Object[]) {
// Put each of the values in the buffer ...
for (Object v : (Object[]) value) {
buffer.put(v, createRow(batch));
}
} else if (value != null) {
buffer.put(value, createRow(batch));
} else if (rowsWithNullKey != null) {
rowsWithNullKey.addIfAbsent(createRow(batch));
}
++batchSize;
}
batch = sequence.nextBatch();
}
while (batch != null) {
while (batch.hasNext()) {
batch.nextRow();
value = extractor.getValueInRow(batch);
if (value instanceof Object[]) {
// Put each of the values in the buffer ...
for (Object v : (Object[]) value) {
buffer.put(v, createRow(batch));
}
} else if (value != null) {
buffer.put(value, createRow(batch));
} else if (rowsWithNullKey != null) {
rowsWithNullKey.addIfAbsent(createRow(batch));
}
}
batch = sequence.nextBatch();
}
return batchSize;
}
