org.elasticsearch.search.facet.query.QueryFacetExecutor Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon 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.facet.query;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.search.*;
import org.apache.lucene.util.Bits;
import org.elasticsearch.common.lucene.docset.AndDocIdSet;
import org.elasticsearch.common.lucene.docset.ContextDocIdSet;
import org.elasticsearch.common.lucene.docset.DocIdSets;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.lucene.search.XConstantScoreQuery;
import org.elasticsearch.common.lucene.search.XFilteredQuery;
import org.elasticsearch.search.facet.FacetExecutor;
import org.elasticsearch.search.facet.InternalFacet;
import java.io.IOException;
import java.util.List;
/**
*
*/
public class QueryFacetExecutor extends FacetExecutor {
private final Query query;
private final Filter filter;
// default to not initialized
int count = -1;
public QueryFacetExecutor(Query query) {
this.query = query;
Filter possibleFilter = extractFilterIfApplicable(query);
if (possibleFilter != null) {
this.filter = possibleFilter;
} else {
this.filter = new QueryWrapperFilter(query);
}
}
@Override
public Collector collector() {
return new Collector();
}
@Override
public Post post() {
return new Post();
}
@Override
public InternalFacet buildFacet(String facetName) {
return new InternalQueryFacet(facetName, count);
}
class Post extends FacetExecutor.Post {
@Override
public void executePost(List docSets) throws IOException {
int count = 0;
for (ContextDocIdSet entry : docSets) {
DocIdSet filteredDocIdSet = filter.getDocIdSet(entry.context, entry.context.reader().getLiveDocs());
if (filteredDocIdSet == null || entry.docSet == null) {
continue;
}
DocIdSetIterator iter = new AndDocIdSet(new DocIdSet[]{entry.docSet, filteredDocIdSet}).iterator();
while (iter.nextDoc() != DocIdSetIterator.NO_MORE_DOCS) {
count++;
}
}
QueryFacetExecutor.this.count = count;
}
}
class Collector extends FacetExecutor.Collector {
private int count = 0;
private Bits bits;
@Override
public void collect(int doc) throws IOException {
if (bits.get(doc)) {
count++;
}
}
@Override
public void setNextReader(AtomicReaderContext context) throws IOException {
bits = DocIdSets.toSafeBits(context.reader(), filter.getDocIdSet(context, context.reader().getLiveDocs()));
}
@Override
public void postCollection() {
bits = null;
QueryFacetExecutor.this.count = 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 XFilteredQuery) {
XFilteredQuery fQuery = (XFilteredQuery) query;
if (Queries.isConstantMatchAllQuery(fQuery.getQuery())) {
return fQuery.getFilter();
}
} else if (query instanceof XConstantScoreQuery) {
return ((XConstantScoreQuery) query).getFilter();
} else if (query instanceof ConstantScoreQuery) {
ConstantScoreQuery constantScoreQuery = (ConstantScoreQuery) query;
if (constantScoreQuery.getFilter() != null) {
return constantScoreQuery.getFilter();
}
}
return null;
}
}