@Override
protected Suggest.Suggestion<
? extends Suggest.Suggestion.Entry<? extends Suggest.Suggestion.Entry.Option>>
innerExecute(
String name,
CompletionSuggestionContext suggestionContext,
IndexReader indexReader,
CharsRef spare)
throws IOException {
if (suggestionContext.mapper() == null
|| !(suggestionContext.mapper() instanceof CompletionFieldMapper)) {
throw new ElasticsearchException(
"Field [" + suggestionContext.getField() + "] is not a completion suggest field");
}
CompletionSuggestion completionSuggestion =
new CompletionSuggestion(name, suggestionContext.getSize());
UnicodeUtil.UTF8toUTF16(suggestionContext.getText(), spare);
CompletionSuggestion.Entry completionSuggestEntry =
new CompletionSuggestion.Entry(new StringText(spare.toString()), 0, spare.length());
completionSuggestion.addTerm(completionSuggestEntry);
String fieldName = suggestionContext.getField();
Map<String, CompletionSuggestion.Entry.Option> results =
Maps.newHashMapWithExpectedSize(indexReader.leaves().size() * suggestionContext.getSize());
for (AtomicReaderContext atomicReaderContext : indexReader.leaves()) {
AtomicReader atomicReader = atomicReaderContext.reader();
Terms terms = atomicReader.fields().terms(fieldName);
if (terms instanceof Completion090PostingsFormat.CompletionTerms) {
final Completion090PostingsFormat.CompletionTerms lookupTerms =
(Completion090PostingsFormat.CompletionTerms) terms;
final Lookup lookup = lookupTerms.getLookup(suggestionContext.mapper(), suggestionContext);
if (lookup == null) {
// we don't have a lookup for this segment.. this might be possible if a merge dropped all
// docs from the segment that had a value in this segment.
continue;
}
List<Lookup.LookupResult> lookupResults =
lookup.lookup(spare, false, suggestionContext.getSize());
for (Lookup.LookupResult res : lookupResults) {
final String key = res.key.toString();
final float score = res.value;
final Option value = results.get(key);
if (value == null) {
final Option option =
new CompletionSuggestion.Entry.Option(
new StringText(key),
score,
res.payload == null ? null : new BytesArray(res.payload));
results.put(key, option);
} else if (value.getScore() < score) {
value.setScore(score);
value.setPayload(res.payload == null ? null : new BytesArray(res.payload));
}
}
}
}
final List<CompletionSuggestion.Entry.Option> options =
new ArrayList<CompletionSuggestion.Entry.Option>(results.values());
CollectionUtil.introSort(options, scoreComparator);
int optionCount = Math.min(suggestionContext.getSize(), options.size());
for (int i = 0; i < optionCount; i++) {
completionSuggestEntry.addOption(options.get(i));
}
return completionSuggestion;
}
@Override
public int compare(Option o1, Option o2) {
return Float.compare(o2.getScore(), o1.getScore());
}