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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.index.search.child;
import org.apache.lucene.index.*;
import org.apache.lucene.search.*;
import org.apache.lucene.util.Bits;
import org.apache.lucene.util.ToStringUtils;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.lease.Releasable;
import org.elasticsearch.common.lease.Releasables;
import org.elasticsearch.common.lucene.docset.DocIdSets;
import org.elasticsearch.common.lucene.search.ApplyAcceptedDocsFilter;
import org.elasticsearch.common.lucene.search.NoopCollector;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.common.util.BigArrays;
import org.elasticsearch.common.util.FloatArray;
import org.elasticsearch.common.util.LongHash;
import org.elasticsearch.index.fielddata.IndexParentChildFieldData;
import org.elasticsearch.index.fielddata.plain.ParentChildIndexFieldData;
import org.elasticsearch.search.internal.SearchContext;
import org.elasticsearch.search.internal.SearchContext.Lifetime;
import java.io.IOException;
import java.util.Set;
/**
* A query implementation that executes the wrapped parent query and
* connects the matching parent docs to the related child documents
* using the {@link ParentChildIndexFieldData}.
*/
public class ParentQuery extends Query {
private final ParentChildIndexFieldData parentChildIndexFieldData;
private Query originalParentQuery;
private final String parentType;
private final Filter childrenFilter;
private Query rewrittenParentQuery;
private IndexReader rewriteIndexReader;
public ParentQuery(ParentChildIndexFieldData parentChildIndexFieldData, Query parentQuery, String parentType, Filter childrenFilter) {
this.parentChildIndexFieldData = parentChildIndexFieldData;
this.originalParentQuery = parentQuery;
this.parentType = parentType;
this.childrenFilter = childrenFilter;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || obj.getClass() != this.getClass()) {
return false;
}
ParentQuery that = (ParentQuery) obj;
if (!originalParentQuery.equals(that.originalParentQuery)) {
return false;
}
if (!parentType.equals(that.parentType)) {
return false;
}
if (getBoost() != that.getBoost()) {
return false;
}
return true;
}
@Override
public int hashCode() {
int result = originalParentQuery.hashCode();
result = 31 * result + parentType.hashCode();
result = 31 * result + Float.floatToIntBits(getBoost());
return result;
}
@Override
public String toString(String field) {
return "ParentQuery[" + parentType + "](" + originalParentQuery.toString(field) + ')' + ToStringUtils.boost(getBoost());
}
@Override
// See TopChildrenQuery#rewrite
public Query rewrite(IndexReader reader) throws IOException {
if (rewrittenParentQuery == null) {
rewriteIndexReader = reader;
rewrittenParentQuery = originalParentQuery.rewrite(reader);
}
return this;
}
@Override
public void extractTerms(Set terms) {
rewrittenParentQuery.extractTerms(terms);
}
@Override
public Query clone() {
ParentQuery q = (ParentQuery) super.clone();
q.originalParentQuery = originalParentQuery.clone();
if (q.rewrittenParentQuery != null) {
q.rewrittenParentQuery = rewrittenParentQuery.clone();
}
return q;
}
@Override
public Weight createWeight(IndexSearcher searcher) throws IOException {
SearchContext sc = SearchContext.current();
ChildWeight childWeight;
boolean releaseCollectorResource = true;
ParentOrdAndScoreCollector collector = null;
IndexParentChildFieldData globalIfd = parentChildIndexFieldData.loadGlobal(searcher.getIndexReader());
if (globalIfd == null) {
// No docs of the specified type don't exist on this shard
return Queries.newMatchNoDocsQuery().createWeight(searcher);
}
try {
assert rewrittenParentQuery != null;
assert rewriteIndexReader == searcher.getIndexReader() : "not equal, rewriteIndexReader=" + rewriteIndexReader + " searcher.getIndexReader()=" + searcher.getIndexReader();
final Query parentQuery = rewrittenParentQuery;
collector = new ParentOrdAndScoreCollector(sc, globalIfd, parentType);
IndexSearcher indexSearcher = new IndexSearcher(sc.searcher().getIndexReader());
indexSearcher.setSimilarity(searcher.getSimilarity());
indexSearcher.search(parentQuery, collector);
if (collector.parentCount() == 0) {
return Queries.newMatchNoDocsQuery().createWeight(searcher);
}
childWeight = new ChildWeight(parentQuery.createWeight(searcher), childrenFilter, collector, globalIfd);
releaseCollectorResource = false;
} finally {
if (releaseCollectorResource) {
// either if we run into an exception or if we return early
Releasables.close(collector);
}
}
sc.addReleasable(collector, Lifetime.COLLECTION);
return childWeight;
}
private static class ParentOrdAndScoreCollector extends NoopCollector implements Releasable {
private final LongHash parentIdxs;
private FloatArray scores;
private final IndexParentChildFieldData globalIfd;
private final BigArrays bigArrays;
private final String parentType;
private Scorer scorer;
private SortedDocValues values;
ParentOrdAndScoreCollector(SearchContext searchContext, IndexParentChildFieldData globalIfd, String parentType) {
this.bigArrays = searchContext.bigArrays();
this.parentIdxs = new LongHash(512, bigArrays);
this.scores = bigArrays.newFloatArray(512, false);
this.globalIfd = globalIfd;
this.parentType = parentType;
}
@Override
public void collect(int doc) throws IOException {
// It can happen that for particular segment no document exist for an specific type. This prevents NPE
if (values != null) {
long globalOrdinal = values.getOrd(doc);
if (globalOrdinal != SortedSetDocValues.NO_MORE_ORDS) {
long parentIdx = parentIdxs.add(globalOrdinal);
if (parentIdx >= 0) {
scores = bigArrays.grow(scores, parentIdx + 1);
scores.set(parentIdx, scorer.score());
} else {
assert false : "parent id should only match once, since there can only be one parent doc";
}
}
}
}
@Override
public void setScorer(Scorer scorer) throws IOException {
this.scorer = scorer;
}
@Override
public void setNextReader(AtomicReaderContext context) throws IOException {
values = globalIfd.load(context).getOrdinalsValues(parentType);
}
@Override
public void close() throws ElasticsearchException {
Releasables.close(parentIdxs, scores);
}
public long parentCount() {
return parentIdxs.size();
}
}
private class ChildWeight extends Weight {
private final Weight parentWeight;
private final Filter childrenFilter;
private final LongHash parentIdxs;
private final FloatArray scores;
private final IndexParentChildFieldData globalIfd;
private ChildWeight(Weight parentWeight, Filter childrenFilter, ParentOrdAndScoreCollector collector, IndexParentChildFieldData globalIfd) {
this.parentWeight = parentWeight;
this.childrenFilter = new ApplyAcceptedDocsFilter(childrenFilter);
this.parentIdxs = collector.parentIdxs;
this.scores = collector.scores;
this.globalIfd = globalIfd;
}
@Override
public Explanation explain(AtomicReaderContext context, int doc) throws IOException {
return new Explanation(getBoost(), "not implemented yet...");
}
@Override
public Query getQuery() {
return ParentQuery.this;
}
@Override
public float getValueForNormalization() throws IOException {
float sum = parentWeight.getValueForNormalization();
sum *= getBoost() * getBoost();
return sum;
}
@Override
public void normalize(float norm, float topLevelBoost) {
}
@Override
public Scorer scorer(AtomicReaderContext context, Bits acceptDocs) throws IOException {
DocIdSet childrenDocSet = childrenFilter.getDocIdSet(context, acceptDocs);
if (DocIdSets.isEmpty(childrenDocSet)) {
return null;
}
SortedDocValues bytesValues = globalIfd.load(context).getOrdinalsValues(parentType);
if (bytesValues == null) {
return null;
}
return new ChildScorer(this, parentIdxs, scores, childrenDocSet.iterator(), bytesValues);
}
}
private static class ChildScorer extends Scorer {
private final LongHash parentIdxs;
private final FloatArray scores;
private final DocIdSetIterator childrenIterator;
private final SortedDocValues ordinals;
private int currentChildDoc = -1;
private float currentScore;
ChildScorer(Weight weight, LongHash parentIdxs, FloatArray scores, DocIdSetIterator childrenIterator, SortedDocValues ordinals) {
super(weight);
this.parentIdxs = parentIdxs;
this.scores = scores;
this.childrenIterator = childrenIterator;
this.ordinals = ordinals;
}
@Override
public float score() throws IOException {
return currentScore;
}
@Override
public int freq() throws IOException {
// We don't have the original child query hit info here...
// But the freq of the children could be collector and returned here, but makes this Scorer more expensive.
return 1;
}
@Override
public int docID() {
return currentChildDoc;
}
@Override
public int nextDoc() throws IOException {
while (true) {
currentChildDoc = childrenIterator.nextDoc();
if (currentChildDoc == DocIdSetIterator.NO_MORE_DOCS) {
return currentChildDoc;
}
int globalOrdinal = (int) ordinals.getOrd(currentChildDoc);
if (globalOrdinal < 0) {
continue;
}
final long parentIdx = parentIdxs.find(globalOrdinal);
if (parentIdx != -1) {
currentScore = scores.get(parentIdx);
return currentChildDoc;
}
}
}
@Override
public int advance(int target) throws IOException {
currentChildDoc = childrenIterator.advance(target);
if (currentChildDoc == DocIdSetIterator.NO_MORE_DOCS) {
return currentChildDoc;
}
int globalOrdinal = (int) ordinals.getOrd(currentChildDoc);
if (globalOrdinal < 0) {
return nextDoc();
}
final long parentIdx = parentIdxs.find(globalOrdinal);
if (parentIdx != -1) {
currentScore = scores.get(parentIdx);
return currentChildDoc;
} else {
return nextDoc();
}
}
@Override
public long cost() {
return childrenIterator.cost();
}
}
}