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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.facet.nested;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.util.Bits;
import org.apache.lucene.util.FixedBitSet;
import org.elasticsearch.common.lucene.docset.ContextDocIdSet;
import org.elasticsearch.common.lucene.docset.DocIdSets;
import org.elasticsearch.common.lucene.search.FilteredCollector;
import org.elasticsearch.common.lucene.search.XCollector;
import org.elasticsearch.index.cache.fixedbitset.FixedBitSetFilter;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.mapper.object.ObjectMapper;
import org.elasticsearch.index.search.nested.NonNestedDocsFilter;
import org.elasticsearch.search.SearchParseException;
import org.elasticsearch.search.facet.FacetExecutor;
import org.elasticsearch.search.facet.InternalFacet;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
*/
public class NestedFacetExecutor extends FacetExecutor {
private final FacetExecutor facetExecutor;
private final FixedBitSetFilter parentFilter;
private final FixedBitSetFilter childFilter;
public NestedFacetExecutor(FacetExecutor facetExecutor, SearchContext context, String nestedPath) {
this.facetExecutor = facetExecutor;
MapperService.SmartNameObjectMapper mapper = context.smartNameObjectMapper(nestedPath);
if (mapper == null) {
throw new SearchParseException(context, "facet nested path [" + nestedPath + "] not found");
}
ObjectMapper objectMapper = mapper.mapper();
if (objectMapper == null) {
throw new SearchParseException(context, "facet nested path [" + nestedPath + "] not found");
}
if (!objectMapper.nested().isNested()) {
throw new SearchParseException(context, "facet nested path [" + nestedPath + "] is not nested");
}
parentFilter = context.fixedBitSetFilterCache().getFixedBitSetFilter(NonNestedDocsFilter.INSTANCE);
childFilter = context.fixedBitSetFilterCache().getFixedBitSetFilter(objectMapper.nestedTypeFilter());
}
@Override
public InternalFacet buildFacet(String facetName) {
return facetExecutor.buildFacet(facetName);
}
@Override
public Collector collector() {
XCollector collector = facetExecutor.collector();
if (collector == null) {
return null;
}
return new Collector(collector, parentFilter, childFilter);
}
@Override
public Post post() {
FacetExecutor.Post post = facetExecutor.post();
if (post == null) {
return null;
}
return new Post(post, parentFilter, childFilter);
}
public static class Post extends FacetExecutor.Post {
private final FacetExecutor.Post post;
private final Filter parentFilter;
private final Filter childFilter;
public Post(FacetExecutor.Post post, Filter parentFilter, Filter childFilter) {
this.post = post;
this.parentFilter = parentFilter;
this.childFilter = childFilter;
}
public Post(Post post, Filter filter) {
this.post = new FacetExecutor.Post.Filtered(post.post, filter);
this.parentFilter = post.parentFilter;
this.childFilter = post.childFilter;
}
@Override
public void executePost(List docSets) throws IOException {
List nestedEntries = new ArrayList<>(docSets.size());
for (int i = 0; i < docSets.size(); i++) {
ContextDocIdSet entry = docSets.get(i);
AtomicReaderContext context = entry.context;
// Can use null as acceptedDocs here, since only live doc ids are being pushed to collect method.
DocIdSet docIdSet = parentFilter.getDocIdSet(context, null);
if (DocIdSets.isEmpty(docIdSet)) {
continue;
}
// Im ES if parent is deleted, then also the children are deleted. Therefore acceptedDocs can also null here.
Bits childDocs = DocIdSets.toSafeBits(context.reader(), childFilter.getDocIdSet(context, null));
FixedBitSet parentDocs = (FixedBitSet) docIdSet;
DocIdSetIterator iter = entry.docSet.iterator();
int parentDoc = iter.nextDoc();
if (parentDoc == DocIdSetIterator.NO_MORE_DOCS) {
continue;
}
if (parentDoc == 0) {
parentDoc = iter.nextDoc();
}
if (parentDoc == DocIdSetIterator.NO_MORE_DOCS) {
continue;
}
FixedBitSet childSet = new FixedBitSet(context.reader().maxDoc());
do {
int prevParentDoc = parentDocs.prevSetBit(parentDoc - 1);
for (int childDocId = (parentDoc - 1); childDocId > prevParentDoc; childDocId--) {
if (childDocs.get(childDocId)) {
childSet.set(childDocId);
}
}
} while ((parentDoc = iter.nextDoc()) != DocIdSetIterator.NO_MORE_DOCS);
nestedEntries.add(new ContextDocIdSet(entry.context, childSet));
}
post.executePost(nestedEntries);
}
}
public static class Collector extends FacetExecutor.Collector {
private final org.apache.lucene.search.Collector collector;
private final Filter parentFilter;
private final Filter childFilter;
private Bits childDocs;
private FixedBitSet parentDocs;
// We can move
public Collector(Collector collector, Filter filter) {
this.collector = new FilteredCollector(collector.collector, filter);
this.parentFilter = collector.parentFilter;
this.childFilter = collector.childFilter;
}
public Collector(org.apache.lucene.search.Collector collector, Filter parentFilter, Filter childFilter) {
this.collector = collector;
this.parentFilter = parentFilter;
this.childFilter = childFilter;
}
@Override
public void postCollection() throws IOException {
if (collector instanceof XCollector) {
((XCollector) collector).postCollection();
}
}
@Override
public void setScorer(Scorer scorer) throws IOException {
collector.setScorer(scorer);
}
@Override
public void setNextReader(AtomicReaderContext context) throws IOException {
collector.setNextReader(context);
// Can use null as acceptedDocs here, since only live doc ids are being pushed to collect method.
DocIdSet docIdSet = parentFilter.getDocIdSet(context, null);
// Im ES if parent is deleted, then also the children are deleted. Therefore acceptedDocs can also null here.
childDocs = DocIdSets.toSafeBits(context.reader(), childFilter.getDocIdSet(context, null));
if (DocIdSets.isEmpty(docIdSet)) {
parentDocs = null;
} else {
parentDocs = (FixedBitSet) docIdSet;
}
}
@Override
public boolean acceptsDocsOutOfOrder() {
return collector.acceptsDocsOutOfOrder();
}
@Override
public void collect(int parentDoc) throws IOException {
if (parentDoc == 0 || parentDocs == null) {
return;
}
int prevParentDoc = parentDocs.prevSetBit(parentDoc - 1);
for (int i = (parentDoc - 1); i > prevParentDoc; i--) {
if (childDocs.get(i)) {
collector.collect(i);
}
}
}
}
}