/**
* Check if we have found a match
*
* @return boolean
* @throws IOException
*/
private boolean found() throws IOException {
// No predicate test if there are no positions
if (positions.length == 0) {
return true;
}
// no more documents - no match
if (!more) {
return false;
}
// min and max must point to the same document
if (min != max) {
return false;
}
if (rootDoc != max) {
return false;
}
// We have duplicate entries - suport should be improved but it is not used at the moment
// This shuld work akin to the leaf scorer
// It would compact the index
// The match must be in a known term range
int count = root.freq();
int start = 0;
int end = -1;
for (int i = 0; i < count; i++) {
if (i == 0) {
// First starts at zero
start = 0;
end = root.nextPosition();
} else {
start = end + 1;
end = root.nextPosition();
}
if (check(start, end)) {
return true;
}
}
// We had checks to do and they all failed.
return false;
}
public void seek(TermEnum terms) throws IOException {
original.seek(terms);
docFreq = terms.docFreq();
pointer = -1;
if (docFreq > postingMaps.length) { // grow postingsMap
PostingMap[] newMap = new PostingMap[docFreq];
System.arraycopy(postingMaps, 0, newMap, 0, postingMaps.length);
for (int i = postingMaps.length; i < docFreq; i++) {
newMap[i] = new PostingMap();
}
postingMaps = newMap;
}
out.reset();
int i = 0;
while (original.next()) {
PostingMap map = postingMaps[i++];
map.newDoc = oldToNew[original.doc()]; // remap the newDoc id
map.offset = out.getFilePointer(); // save pointer to buffer
final int tf = original.freq(); // buffer tf & positions
out.writeVInt(tf);
int prevPosition = 0;
for (int j = tf; j > 0; j--) { // delta encode positions
int p = original.nextPosition();
out.writeVInt(p - prevPosition);
prevPosition = p;
}
}
out.flush();
docFreq = i; // allow for deletions
Arrays.sort(postingMaps, 0, docFreq); // resort by mapped doc ids
// HeapSorter.sort(postingMaps,docFreq); // TODO MC - due to the lack of space
// NOTE: this might be substantially faster if RAMInputStream were public
// and supported a reset() operation.
in = tempDir.openInput(TEMP_FILE);
}
@Override
public void load() throws Exception {
TermPositions tp = null;
byte[] payloadBuffer = new byte[4]; // four bytes for an int
try {
tp = _reader.termPositions(_sizeTerm);
if (tp == null) return;
while (tp.next()) {
if (tp.freq() > 0) {
tp.nextPosition();
tp.getPayload(payloadBuffer, 0);
int len = bytesToInt(payloadBuffer);
allocate(tp.doc(), Math.min(len, _maxItems), true);
}
}
} finally {
if (tp != null) tp.close();
}
}
private void dumpTerms() throws IOException {
outputBanner("Terms (in Term.compareTo() order)");
TermEnum terms = mIndexReader.terms();
int order = 0;
while (terms.next()) {
order++;
Term term = terms.term();
String field = term.field();
String text = term.text();
if (!wantThisTerm(field, text)) {
continue;
}
outputLn(order + " " + field + ": " + text);
/*
* for each term, print the
* <document, frequency, <position>* > tuples for a term.
*
* document: document in which the Term appears
* frequency: number of time the Term appears in the document
* position: position for each appearance in the document
*
* e.g. doc.add(new Field("field", "one two three two four five", Field.Store.YES, Field.Index.ANALYZED));
* then the tuple for Term("field", "two") in this document would be like:
* 88, 2, <2, 4>
* where
* 88 is the document number
* 2 is the frequency this term appear in the document
* <2, 4> are the positions for each appearance in the document
*/
// by TermPositions
outputLn(" document, frequency, <position>*");
// keep track of docs that appear in all terms that are filtered in.
Set<Integer> docNums = null;
if (hasFilters()) {
docNums = new HashSet<Integer>();
}
TermPositions termPos = mIndexReader.termPositions(term);
while (termPos.next()) {
int docNum = termPos.doc();
int freq = termPos.freq();
if (docNums != null) {
docNums.add(docNum);
}
output(" " + docNum + ", " + freq + ", <");
boolean first = true;
for (int f = 0; f < freq; f++) {
int positionInDoc = termPos.nextPosition();
if (!first) {
output(" ");
} else {
first = false;
}
output(positionInDoc + "");
}
outputLn(">");
}
termPos.close();
if (docNums != null) {
computeDocsIntersection(docNums);
}
outputLn();
if (order % 1000 == 0) {
mConsole.debug("Dumped " + order + " terms");
}
}
terms.close();
}
