/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.facet.query;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.DeletionAwareConstantScoreQuery;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.FilteredQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.QueryWrapperFilter;
import org.apache.lucene.search.TotalHitCountCollector;
import org.elasticsearch.common.lucene.docset.DocSet;
import org.elasticsearch.common.lucene.docset.DocSets;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.index.cache.filter.FilterCache;
import org.elasticsearch.search.facet.AbstractFacetCollector;
import org.elasticsearch.search.facet.Facet;
import org.elasticsearch.search.facet.OptimizeGlobalFacetCollector;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
/**
* @author kimchy (shay.banon)
*/
public class QueryFacetCollector extends AbstractFacetCollector implements OptimizeGlobalFacetCollector {
private final Query query;
private final Filter filter;
private DocSet docSet;
private int count = 0;
public QueryFacetCollector(String facetName, Query query, FilterCache filterCache) {
super(facetName);
this.query = query;
Filter possibleFilter = extractFilterIfApplicable(query);
if (possibleFilter != null) {
this.filter = possibleFilter;
} else {
this.filter = new QueryWrapperFilter(query);
}
}
@Override protected void doSetNextReader(IndexReader reader, int docBase) throws IOException {
docSet = DocSets.convert(reader, filter.getDocIdSet(reader));
}
@Override protected void doCollect(int doc) throws IOException {
if (docSet.get(doc)) {
count++;
}
}
@Override public void optimizedGlobalExecution(SearchContext searchContext) throws IOException {
Query query = this.query;
if (super.filter != null) {
query = new FilteredQuery(query, super.filter);
}
Filter searchFilter = searchContext.mapperService().searchFilter(searchContext.types());
if (searchFilter != null) {
query = new FilteredQuery(query, searchContext.filterCache().cache(searchFilter));
}
TotalHitCountCollector collector = new TotalHitCountCollector();
searchContext.searcher().search(query, collector);
count = collector.getTotalHits();
}
@Override public Facet facet() {
return new InternalQueryFacet(facetName, count);
}
/**
* If its a filtered query with a match all, then we just need the inner filter.
*/
private Filter extractFilterIfApplicable(Query query) {
if (query instanceof FilteredQuery) {
FilteredQuery fQuery = (FilteredQuery) query;
if (Queries.isMatchAllQuery(fQuery.getQuery())) {
return fQuery.getFilter();
}
} else if (query instanceof DeletionAwareConstantScoreQuery) {
return ((DeletionAwareConstantScoreQuery) query).getFilter();
} else if (query instanceof ConstantScoreQuery) {
ConstantScoreQuery constantScoreQuery = (ConstantScoreQuery) query;
if (constantScoreQuery.getFilter() != null) {
return constantScoreQuery.getFilter();
}
}
return null;
}
}