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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.search.fetch.matchedqueries;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import org.apache.lucene.index.Term;
import org.apache.lucene.queries.TermFilter;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.Filter;
import org.apache.lucene.util.Bits;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.common.lucene.docset.DocIdSets;
import org.elasticsearch.index.mapper.Uid;
import org.elasticsearch.index.mapper.internal.UidFieldMapper;
import org.elasticsearch.search.SearchParseElement;
import org.elasticsearch.search.fetch.FetchSubPhase;
import org.elasticsearch.search.internal.InternalSearchHit;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.internal.SearchContext.Lifetime;
import java.io.IOException;
import java.util.List;
import java.util.Map;
/**
*
*/
public class MatchedQueriesFetchSubPhase implements FetchSubPhase {
@Override
public Map<String, ? extends SearchParseElement> parseElements() {
return ImmutableMap.of();
}
@Override
public boolean hitsExecutionNeeded(SearchContext context) {
return false;
}
@Override
public void hitsExecute(SearchContext context, InternalSearchHit[] hits) throws ElasticsearchException {
}
@Override
public boolean hitExecutionNeeded(SearchContext context) {
return !context.parsedQuery().namedFilters().isEmpty()
|| (context.parsedPostFilter() !=null && !context.parsedPostFilter().namedFilters().isEmpty());
}
@Override
public void hitExecute(SearchContext context, HitContext hitContext) throws ElasticsearchException {
List<String> matchedQueries = Lists.newArrayListWithCapacity(2);
try {
DocIdSet docAndNestedDocsIdSet = null;
if (context.mapperService().documentMapper(hitContext.hit().type()).hasNestedObjects()) {
// Both main and nested Lucene docs have a _uid field
Filter docAndNestedDocsFilter = new TermFilter(new Term(UidFieldMapper.NAME, Uid.createUidAsBytes(hitContext.hit().type(), hitContext.hit().id())));
docAndNestedDocsIdSet = docAndNestedDocsFilter.getDocIdSet(hitContext.readerContext(), null);
}
addMatchedQueries(hitContext, context.parsedQuery().namedFilters(), matchedQueries, docAndNestedDocsIdSet);
if (context.parsedPostFilter() != null) {
addMatchedQueries(hitContext, context.parsedPostFilter().namedFilters(), matchedQueries, docAndNestedDocsIdSet);
}
} catch (IOException e) {
throw ExceptionsHelper.convertToElastic(e);
} finally {
SearchContext.current().clearReleasables(Lifetime.COLLECTION);
}
hitContext.hit().matchedQueries(matchedQueries.toArray(new String[matchedQueries.size()]));
}
private void addMatchedQueries(HitContext hitContext, ImmutableMap<String, Filter> namedFiltersAndQueries, List<String> matchedQueries, DocIdSet docAndNestedDocsIdSet) throws IOException {
for (Map.Entry<String, Filter> entry : namedFiltersAndQueries.entrySet()) {
String name = entry.getKey();
Filter filter = entry.getValue();
DocIdSet filterDocIdSet = filter.getDocIdSet(hitContext.readerContext(), null); // null is fine, since we filter by hitContext.docId()
if (!DocIdSets.isEmpty(filterDocIdSet)) {
if (!DocIdSets.isEmpty(docAndNestedDocsIdSet)) {
DocIdSetIterator filterIterator = filterDocIdSet.iterator();
DocIdSetIterator docAndNestedDocsIterator = docAndNestedDocsIdSet.iterator();
if (filterIterator != null && docAndNestedDocsIterator != null) {
int matchedDocId = -1;
for (int docId = docAndNestedDocsIterator.nextDoc(); docId < DocIdSetIterator.NO_MORE_DOCS; docId = docAndNestedDocsIterator.nextDoc()) {
if (docId != matchedDocId) {
matchedDocId = filterIterator.advance(docId);
}
if (matchedDocId == docId) {
matchedQueries.add(name);
break;
}
}
}
} else {
Bits bits = filterDocIdSet.bits();
if (bits != null) {
if (bits.get(hitContext.docId())) {
matchedQueries.add(name);
}
} else {
DocIdSetIterator iterator = filterDocIdSet.iterator();
if (iterator != null) {
if (iterator.advance(hitContext.docId()) == hitContext.docId()) {
matchedQueries.add(name);
}
}
}
}
}
}
}
}