if (mapper.termVector() != Field.TermVector.WITH_POSITIONS_OFFSETS) {
if (!context.queryRewritten()) {
try {
context.updateRewriteQuery(context.searcher().rewrite(context.query()));
} catch (IOException e) {
throw new FetchPhaseExecutionException(context, "Failed to highlight field [" + field.field() + "]", e);
}
}
// Don't use the context.query() since it might be rewritten, and we need to pass the non rewritten queries to
// let the highlighter handle MultiTerm ones
QueryScorer queryScorer = new QueryScorer(context.parsedQuery().query(), null);
queryScorer.setExpandMultiTermQuery(true);
Fragmenter fragmenter;
if (field.numberOfFragments() == 0) {
fragmenter = new NullFragmenter();
} else {
fragmenter = new SimpleSpanFragmenter(queryScorer, field.fragmentCharSize());
}
Formatter formatter = new SimpleHTMLFormatter(field.preTags()[0], field.postTags()[0]);
Highlighter highlighter = new Highlighter(formatter, DEFAULT_ENCODER, queryScorer);
highlighter.setTextFragmenter(fragmenter);
List<Object> textsToHighlight;
if (mapper.stored()) {
try {
Document doc = hitContext.reader().document(hitContext.docId(), new SingleFieldSelector(mapper.names().indexName()));
textsToHighlight = new ArrayList<Object>(doc.getFields().size());
for (Fieldable docField : doc.getFields()) {
if (docField.stringValue() != null) {
textsToHighlight.add(docField.stringValue());
}
}
} catch (Exception e) {
throw new FetchPhaseExecutionException(context, "Failed to highlight field [" + field.field() + "]", e);
}
} else {
SearchLookup lookup = context.lookup();
lookup.setNextReader(hitContext.reader());
lookup.setNextDocId(hitContext.docId());
textsToHighlight = lookup.source().getValues(mapper.names().fullName());
}
// a HACK to make highlighter do highlighting, even though its using the single frag list builder
int numberOfFragments = field.numberOfFragments() == 0 ? 1 : field.numberOfFragments();
ArrayList<TextFragment> fragsList = new ArrayList<TextFragment>();
try {
for (Object textToHighlight : textsToHighlight) {
String text = textToHighlight.toString();
Analyzer analyzer = context.mapperService().documentMapper(hitContext.hit().type()).mappers().indexAnalyzer();
TokenStream tokenStream = analyzer.reusableTokenStream(mapper.names().indexName(), new FastStringReader(text));
TextFragment[] bestTextFragments = highlighter.getBestTextFragments(tokenStream, text, false, numberOfFragments);
for (TextFragment bestTextFragment : bestTextFragments) {
if (bestTextFragment != null && bestTextFragment.getScore() > 0) {
fragsList.add(bestTextFragment);
}
}
}
} catch (Exception e) {
throw new FetchPhaseExecutionException(context, "Failed to highlight field [" + field.field() + "]", e);
}
if (field.scoreOrdered()) {
Collections.sort(fragsList, new Comparator<TextFragment>() {
public int compare(TextFragment o1, TextFragment o2) {
return Math.round(o2.getScore() - o1.getScore());
}
});
}
String[] fragments;
// number_of_fragments is set to 0 but we have a multivalued field
if (field.numberOfFragments() == 0 && textsToHighlight.size() > 1) {
fragments = new String[1];
for (int i = 0; i < fragsList.size(); i++) {
fragments[0] = (fragments[0] != null ? (fragments[0] + " ") : "") + fragsList.get(i).toString();
}
} else {
// refine numberOfFragments if needed
numberOfFragments = fragsList.size() < numberOfFragments ? fragsList.size() : numberOfFragments;
fragments = new String[numberOfFragments];
for (int i = 0; i < fragments.length; i++) {
fragments[i] = fragsList.get(i).toString();
}
}
if (fragments.length > 0) {
HighlightField highlightField = new HighlightField(field.field(), fragments);
highlightFields.put(highlightField.name(), highlightField);
}
} else {
FastVectorHighlighter highlighter = buildHighlighter(context, mapper, field);
FieldQuery fieldQuery = buildFieldQuery(highlighter, context.query(), hitContext.reader(), field);
String[] fragments;
try {
// a HACK to make highlighter do highlighting, even though its using the single frag list builder
int numberOfFragments = field.numberOfFragments() == 0 ? 1 : field.numberOfFragments();
fragments = highlighter.getBestFragments(fieldQuery, hitContext.reader(), hitContext.docId(), mapper.names().indexName(), field.fragmentCharSize(), numberOfFragments);
} catch (IOException e) {
throw new FetchPhaseExecutionException(context, "Failed to highlight field [" + field.field() + "]", e);
}
if (fragments != null && fragments.length > 0) {
HighlightField highlightField = new HighlightField(field.field(), fragments);
highlightFields.put(highlightField.name(), highlightField);
}