public static void writeFlamdex(final FlamdexReader fdx, final FlamdexWriter w)
throws IOException {
final DocIdStream dis = fdx.getDocIdStream();
final int[] docIdBuf = new int[DOC_ID_BUFFER_SIZE];
for (final String intField : fdx.getIntFields()) {
final IntFieldWriter ifw = w.getIntFieldWriter(intField);
final IntTermIterator iter = fdx.getIntTermIterator(intField);
while (iter.next()) {
ifw.nextTerm(iter.term());
dis.reset(iter);
while (true) {
final int n = dis.fillDocIdBuffer(docIdBuf);
for (int i = 0; i < n; ++i) {
ifw.nextDoc(docIdBuf[i]);
}
if (n < docIdBuf.length) break;
}
}
iter.close();
ifw.close();
}
for (final String stringField : fdx.getStringFields()) {
final StringFieldWriter sfw = w.getStringFieldWriter(stringField);
final StringTermIterator iter = fdx.getStringTermIterator(stringField);
while (iter.next()) {
sfw.nextTerm(iter.term());
dis.reset(iter);
while (true) {
final int n = dis.fillDocIdBuffer(docIdBuf);
for (int i = 0; i < n; ++i) {
sfw.nextDoc(docIdBuf[i]);
}
if (n < docIdBuf.length) break;
}
}
iter.close();
sfw.close();
}
dis.close();
w.close();
}
public static void addField(
String indexDir, String newFieldName, FlamdexReader docReader, final String[] values)
throws IOException {
final int[] indices = new int[docReader.getNumDocs()];
for (int i = 0; i < indices.length; i++) {
indices[i] = i;
}
log.debug("sorting");
Quicksortables.sort(
new Quicksortable() {
@Override
public void swap(int i, int j) {
Quicksortables.swap(indices, i, j);
}
@Override
public int compare(int i, int j) {
// Sorting logic: Primarily by value (String), secondarily by document ID (indices[i])
final String left = values[indices[i]];
final String right = values[indices[j]];
if (left.compareTo(right) < 0) {
return -1;
} else if (left.compareTo(right) > 0) {
return 1;
} else { // left == right
if (indices[i] < indices[j]) {
return -1;
} else if (indices[i] > indices[j]) {
return 1;
} else {
return 0; // Both value & doc ID match
}
}
}
},
values.length);
log.debug("writing field " + newFieldName);
final SimpleFlamdexWriter w = new SimpleFlamdexWriter(indexDir, docReader.getNumDocs(), false);
final StringFieldWriter sfw = w.getStringFieldWriter(newFieldName, true);
final IntArrayList docList = new IntArrayList();
docList.add(indices[0]);
for (int i = 1; i < indices.length; ++i) {
final String prev = values[indices[i - 1]];
final String cur = values[indices[i]];
if (cur.compareTo(prev) != 0) {
sfw.nextTerm(prev);
for (int j = 0; j < docList.size(); ++j) {
sfw.nextDoc(docList.getInt(j));
}
docList.clear();
}
docList.add(indices[i]);
}
if (docList.size() > 0) {
sfw.nextTerm(values[indices[indices.length - 1]]);
for (int j = 0; j < docList.size(); ++j) {
sfw.nextDoc(docList.getInt(j));
}
}
sfw.close();
w.close();
}
public static void merge(FlamdexReader[] readers, FlamdexWriter w) throws IOException {
final DocIdStream[] docIdStreams = new DocIdStream[readers.length];
final int[] segmentStartDocs = new int[readers.length];
int totalNumDocs = 0;
for (int i = 0; i < readers.length; ++i) {
docIdStreams[i] = readers[i].getDocIdStream();
segmentStartDocs[i] = totalNumDocs;
totalNumDocs += readers[i].getNumDocs();
}
log.info("merging " + readers.length + " readers with a total of " + totalNumDocs + " docs");
final int[] indexBuf = new int[readers.length];
final int[] docIdBuf = new int[64];
for (final String intField : mergeIntFields(readers)) {
final IntFieldWriter ifw = w.getIntFieldWriter(intField);
final IntTermIteratorWrapper[] iterators = new IntTermIteratorWrapper[readers.length];
final IndirectPriorityQueue<IntTermIteratorWrapper> pq =
new ObjectHeapSemiIndirectPriorityQueue<IntTermIteratorWrapper>(
iterators, iterators.length);
for (int i = 0; i < readers.length; ++i) {
if (!readers[i].getIntFields().contains(intField)) continue;
final IntTermIterator it = readers[i].getIntTermIterator(intField);
if (it.next()) {
iterators[i] = new IntTermIteratorWrapper(it, i);
pq.enqueue(i);
} else {
it.close();
}
}
while (!pq.isEmpty()) {
final long term = iterators[pq.first()].it.term();
int numIndexes = 0;
IntTermIteratorWrapper wrap;
while (!pq.isEmpty() && (wrap = iterators[pq.first()]).it.term() == term) {
final int index = wrap.index;
docIdStreams[index].reset(wrap.it);
indexBuf[numIndexes++] = index;
if (wrap.it.next()) {
pq.changed();
} else {
wrap.it.close();
pq.dequeue();
}
}
ifw.nextTerm(term);
for (int i = 0; i < numIndexes; ++i) {
final int index = indexBuf[i];
final int startDoc = segmentStartDocs[index];
final DocIdStream dis = docIdStreams[index];
while (true) {
final int n = dis.fillDocIdBuffer(docIdBuf);
for (int j = 0; j < n; ++j) {
ifw.nextDoc(docIdBuf[j] + startDoc);
}
if (n < docIdBuf.length) break;
}
}
}
ifw.close();
}
for (final String stringField : mergeStringFields(readers)) {
final StringFieldWriter sfw = w.getStringFieldWriter(stringField);
final StringTermIteratorWrapper[] iterators = new StringTermIteratorWrapper[readers.length];
final IndirectPriorityQueue<StringTermIteratorWrapper> pq =
new ObjectHeapSemiIndirectPriorityQueue<StringTermIteratorWrapper>(
iterators, iterators.length);
for (int i = 0; i < readers.length; ++i) {
if (!readers[i].getStringFields().contains(stringField)) continue;
final StringTermIterator it = readers[i].getStringTermIterator(stringField);
if (it.next()) {
iterators[i] = new StringTermIteratorWrapper(it, i);
pq.enqueue(i);
} else {
it.close();
}
}
while (!pq.isEmpty()) {
final String term = iterators[pq.first()].it.term();
int numIndexes = 0;
StringTermIteratorWrapper wrap;
while (!pq.isEmpty() && (wrap = iterators[pq.first()]).it.term().equals(term)) {
final int index = wrap.index;
docIdStreams[index].reset(wrap.it);
indexBuf[numIndexes++] = index;
if (wrap.it.next()) {
pq.changed();
} else {
wrap.it.close();
pq.dequeue();
}
}
sfw.nextTerm(term);
for (int i = 0; i < numIndexes; ++i) {
final int index = indexBuf[i];
final int startDoc = segmentStartDocs[index];
final DocIdStream dis = docIdStreams[index];
while (true) {
final int n = dis.fillDocIdBuffer(docIdBuf);
for (int j = 0; j < n; ++j) {
sfw.nextDoc(docIdBuf[j] + startDoc);
}
if (n < docIdBuf.length) break;
}
}
}
sfw.close();
}
for (final DocIdStream dis : docIdStreams) {
dis.close();
}
}