public NamedList<Object> doHighlighting(DocList docs, Query query, SolrQueryRequest req, String[] defaultFields) throws IOException {
SolrParams params = req.getParams();
if (!isHighlightingEnabled(params))
return null;
SolrIndexSearcher searcher = req.getSearcher();
IndexSchema schema = searcher.getSchema();
NamedList fragments = new SimpleOrderedMap();
String[] fieldNames = getHighlightFields(query, req, defaultFields);
Set<String> fset = new HashSet<String>();
{
// pre-fetch documents using the Searcher's doc cache
for(String f : fieldNames) { fset.add(f); }
// fetch unique key if one exists.
SchemaField keyField = schema.getUniqueKeyField();
if(null != keyField)
fset.add(keyField.getName());
}
// get FastVectorHighlighter instance out of the processing loop
FastVectorHighlighter fvh = new FastVectorHighlighter(
// FVH cannot process hl.usePhraseHighlighter parameter per-field basis
params.getBool( HighlightParams.USE_PHRASE_HIGHLIGHTER, true ),
// FVH cannot process hl.requireFieldMatch parameter per-field basis
params.getBool( HighlightParams.FIELD_MATCH, false ) );
FieldQuery fieldQuery = fvh.getFieldQuery( query );
// Highlight each document
DocIterator iterator = docs.iterator();
for (int i = 0; i < docs.size(); i++) {
int docId = iterator.nextDoc();
Document doc = searcher.doc(docId, fset);
NamedList docSummaries = new SimpleOrderedMap();
for (String fieldName : fieldNames) {
fieldName = fieldName.trim();
if( useFastVectorHighlighter( params, schema, fieldName ) )
doHighlightingByFastVectorHighlighter( fvh, fieldQuery, req, docSummaries, docId, doc, fieldName );