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/*
* 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.index.search.child;
import gnu.trove.map.hash.TObjectFloatHashMap;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.*;
import org.apache.lucene.util.Bits;
import org.apache.lucene.util.ToStringUtils;
import org.elasticsearch.ElasticSearchIllegalStateException;
import org.elasticsearch.common.CacheRecycler;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.bytes.HashedBytesArray;
import org.elasticsearch.common.lucene.search.ApplyAcceptedDocsFilter;
import org.elasticsearch.common.lucene.search.NoopCollector;
import org.elasticsearch.index.cache.id.IdReaderTypeCache;
import org.elasticsearch.search.internal.SearchContext;
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 IdReaderTypeCache}.
*/
// TODO We use a score of 0 to indicate a doc was not scored in uidToScore, this means score of 0 can be problematic, if we move to HPCC, we can use lset/...
public class ParentQuery extends Query implements SearchContext.Rewrite {
private final SearchContext searchContext;
private final Query originalParentQuery;
private final String parentType;
private final Filter childrenFilter;
private Query rewrittenParentQuery;
private TObjectFloatHashMap uidToScore;
public ParentQuery(SearchContext searchContext, Query parentQuery, String parentType, Filter childrenFilter) {
this.searchContext = searchContext;
this.originalParentQuery = parentQuery;
this.parentType = parentType;
this.childrenFilter = new ApplyAcceptedDocsFilter(childrenFilter);
}
private ParentQuery(ParentQuery unwritten, Query rewrittenParentQuery) {
this.searchContext = unwritten.searchContext;
this.originalParentQuery = unwritten.originalParentQuery;
this.parentType = unwritten.parentType;
this.childrenFilter = unwritten.childrenFilter;
this.rewrittenParentQuery = rewrittenParentQuery;
this.uidToScore = unwritten.uidToScore;
}
@Override
public void contextRewrite(SearchContext searchContext) throws Exception {
searchContext.idCache().refresh(searchContext.searcher().getTopReaderContext().leaves());
uidToScore = CacheRecycler.popObjectFloatMap();
ParentUidCollector collector = new ParentUidCollector(uidToScore, searchContext, parentType);
Query parentQuery;
if (rewrittenParentQuery == null) {
parentQuery = rewrittenParentQuery = searchContext.searcher().rewrite(originalParentQuery);
} else {
parentQuery = rewrittenParentQuery;
}
searchContext.searcher().search(parentQuery, collector);
}
@Override
public void contextClear() {
if (uidToScore != null) {
CacheRecycler.pushObjectFloatMap(uidToScore);
}
uidToScore = null;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || obj.getClass() != this.getClass()) {
return false;
}
HasParentFilter that = (HasParentFilter) obj;
if (!originalParentQuery.equals(that.parentQuery)) {
return false;
}
if (!parentType.equals(that.parentType)) {
return false;
}
return true;
}
@Override
public int hashCode() {
int result = originalParentQuery.hashCode();
result = 31 * result + parentType.hashCode();
return result;
}
@Override
public String toString(String field) {
StringBuilder sb = new StringBuilder();
sb.append("ParentQuery[").append(parentType).append("](")
.append(originalParentQuery.toString(field)).append(')')
.append(ToStringUtils.boost(getBoost()));
return sb.toString();
}
@Override
public Query rewrite(IndexReader reader) throws IOException {
Query rewritten;
if (rewrittenParentQuery == null) {
rewritten = originalParentQuery.rewrite(reader);
} else {
rewritten = rewrittenParentQuery;
}
if (rewritten == rewrittenParentQuery) {
return this;
}
// See TopChildrenQuery#rewrite
ParentQuery rewrite = new ParentQuery(this, rewritten);
int index = searchContext.rewrites().indexOf(this);
searchContext.rewrites().set(index, rewrite);
return rewrite;
}
@Override
public void extractTerms(Set terms) {
rewrittenParentQuery.extractTerms(terms);
}
@Override
public Weight createWeight(IndexSearcher searcher) throws IOException {
if (uidToScore == null) {
throw new ElasticSearchIllegalStateException("has_parent query hasn't executed properly");
}
return new ChildWeight(rewrittenParentQuery.createWeight(searcher));
}
static class ParentUidCollector extends NoopCollector {
final TObjectFloatHashMap uidToScore;
final SearchContext searchContext;
final String parentType;
Scorer scorer;
IdReaderTypeCache typeCache;
ParentUidCollector(TObjectFloatHashMap uidToScore, SearchContext searchContext, String parentType) {
this.uidToScore = uidToScore;
this.searchContext = searchContext;
this.parentType = parentType;
}
@Override
public void collect(int doc) throws IOException {
if (typeCache == null) {
return;
}
HashedBytesArray parentUid = typeCache.idByDoc(doc);
uidToScore.put(parentUid, scorer.score());
}
@Override
public void setScorer(Scorer scorer) throws IOException {
this.scorer = scorer;
}
@Override
public void setNextReader(AtomicReaderContext context) throws IOException {
typeCache = searchContext.idCache().reader(context.reader()).type(parentType);
}
}
class ChildWeight extends Weight {
private final Weight parentWeight;
ChildWeight(Weight parentWeight) {
this.parentWeight = parentWeight;
}
@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, boolean scoreDocsInOrder, boolean topScorer, Bits acceptDocs) throws IOException {
DocIdSet childrenDocSet = childrenFilter.getDocIdSet(context, acceptDocs);
if (childrenDocSet == null || childrenDocSet == DocIdSet.EMPTY_DOCIDSET) {
return null;
}
IdReaderTypeCache idTypeCache = searchContext.idCache().reader(context.reader()).type(parentType);
if (idTypeCache == null) {
return null;
}
return new ChildScorer(this, uidToScore, childrenDocSet.iterator(), idTypeCache);
}
}
static class ChildScorer extends Scorer {
final TObjectFloatHashMap uidToScore;
final DocIdSetIterator childrenIterator;
final IdReaderTypeCache typeCache;
int currentChildDoc = -1;
float currentScore;
ChildScorer(Weight weight, TObjectFloatHashMap uidToScore, DocIdSetIterator childrenIterator, IdReaderTypeCache typeCache) {
super(weight);
this.uidToScore = uidToScore;
this.childrenIterator = childrenIterator;
this.typeCache = typeCache;
}
@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;
}
BytesReference uid = typeCache.parentIdByDoc(currentChildDoc);
if (uid == null) {
continue;
}
currentScore = uidToScore.get(uid);
if (currentScore != 0) {
return currentChildDoc;
}
}
}
@Override
public int advance(int target) throws IOException {
currentChildDoc = childrenIterator.advance(target);
if (currentChildDoc == DocIdSetIterator.NO_MORE_DOCS) {
return currentChildDoc;
}
BytesReference uid = typeCache.idByDoc(currentChildDoc);
if (uid == null) {
return nextDoc();
}
currentScore = uidToScore.get(uid);
if (currentScore == 0) {
return nextDoc();
}
return currentChildDoc;
}
@Override
public long cost() {
return childrenIterator.cost();
}
}
}
