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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.query;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.NotFilter;
import org.elasticsearch.common.lucene.search.XBooleanFilter;
import org.elasticsearch.common.lucene.search.XFilteredQuery;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.fielddata.plain.ParentChildIndexFieldData;
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.mapper.internal.ParentFieldMapper;
import org.elasticsearch.index.query.support.InnerHitsQueryParserHelper;
import org.elasticsearch.index.query.support.XContentStructure;
import org.elasticsearch.index.search.child.CustomQueryWrappingFilter;
import org.elasticsearch.index.search.child.ParentConstantScoreQuery;
import org.elasticsearch.index.search.child.ParentQuery;
import org.elasticsearch.search.fetch.innerhits.InnerHitsContext;
import org.elasticsearch.search.internal.SubSearchContext;
import java.io.IOException;
import java.util.HashSet;
import java.util.Set;
import static org.elasticsearch.index.query.QueryParserUtils.ensureNotDeleteByQuery;
public class HasParentQueryParser implements QueryParser {
public static final String NAME = "has_parent";
private final InnerHitsQueryParserHelper innerHitsQueryParserHelper;
@Inject
public HasParentQueryParser(InnerHitsQueryParserHelper innerHitsQueryParserHelper) {
this.innerHitsQueryParserHelper = innerHitsQueryParserHelper;
}
@Override
public String[] names() {
return new String[]{NAME, Strings.toCamelCase(NAME)};
}
@Override
public Query parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
ensureNotDeleteByQuery(NAME, parseContext);
XContentParser parser = parseContext.parser();
boolean queryFound = false;
float boost = 1.0f;
String parentType = null;
boolean score = false;
String queryName = null;
Tuple innerHits = null;
String currentFieldName = null;
XContentParser.Token token;
XContentStructure.InnerQuery iq = null;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
// Usually, the query would be parsed here, but the child
// type may not have been extracted yet, so use the
// XContentStructure. facade to parse if available,
// or delay parsing if not.
if ("query".equals(currentFieldName)) {
iq = new XContentStructure.InnerQuery(parseContext, parentType == null ? null : new String[] {parentType});
queryFound = true;
} else if ("inner_hits".equals(currentFieldName)) {
innerHits = innerHitsQueryParserHelper.parse(parseContext);
} else {
throw new QueryParsingException(parseContext.index(), "[has_parent] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("type".equals(currentFieldName) || "parent_type".equals(currentFieldName) || "parentType".equals(currentFieldName)) {
parentType = parser.text();
} else if ("_scope".equals(currentFieldName)) {
throw new QueryParsingException(parseContext.index(), "the [_scope] support in [has_parent] query has been removed, use a filter as a facet_filter in the relevant global facet");
} else if ("score_type".equals(currentFieldName) || "scoreType".equals(currentFieldName)) {
String scoreTypeValue = parser.text();
if ("score".equals(scoreTypeValue)) {
score = true;
} else if ("none".equals(scoreTypeValue)) {
score = false;
}
} else if ("score_mode".equals(currentFieldName) || "scoreMode".equals(currentFieldName)) {
String scoreModeValue = parser.text();
if ("score".equals(scoreModeValue)) {
score = true;
} else if ("none".equals(scoreModeValue)) {
score = false;
}
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("_name".equals(currentFieldName)) {
queryName = parser.text();
} else {
throw new QueryParsingException(parseContext.index(), "[has_parent] query does not support [" + currentFieldName + "]");
}
}
}
if (!queryFound) {
throw new QueryParsingException(parseContext.index(), "[has_parent] query requires 'query' field");
}
if (parentType == null) {
throw new QueryParsingException(parseContext.index(), "[has_parent] query requires 'parent_type' field");
}
Query innerQuery = iq.asQuery(parentType);
if (innerQuery == null) {
return null;
}
innerQuery.setBoost(boost);
Query query = createParentQuery(innerQuery, parentType, score, parseContext, innerHits);
if (query == null) {
return null;
}
query.setBoost(boost);
if (queryName != null) {
parseContext.addNamedFilter(queryName, new CustomQueryWrappingFilter(query));
}
return query;
}
static Query createParentQuery(Query innerQuery, String parentType, boolean score, QueryParseContext parseContext, Tuple innerHits) {
DocumentMapper parentDocMapper = parseContext.mapperService().documentMapper(parentType);
if (parentDocMapper == null) {
throw new QueryParsingException(parseContext.index(), "[has_parent] query configured 'parent_type' [" + parentType + "] is not a valid type");
}
if (innerHits != null) {
InnerHitsContext.ParentChildInnerHits parentChildInnerHits = new InnerHitsContext.ParentChildInnerHits(innerHits.v2(), innerQuery, null, parseContext.mapperService(), parentDocMapper);
String name = innerHits.v1() != null ? innerHits.v1() : parentType;
parseContext.addInnerHits(name, parentChildInnerHits);
}
Set parentTypes = new HashSet<>(5);
parentTypes.add(parentDocMapper.type());
ParentChildIndexFieldData parentChildIndexFieldData = null;
for (DocumentMapper documentMapper : parseContext.mapperService().docMappers(false)) {
ParentFieldMapper parentFieldMapper = documentMapper.parentFieldMapper();
if (parentFieldMapper.active()) {
DocumentMapper parentTypeDocumentMapper = parseContext.mapperService().documentMapper(parentFieldMapper.type());
parentChildIndexFieldData = parseContext.getForField(parentFieldMapper);
if (parentTypeDocumentMapper == null) {
// Only add this, if this parentFieldMapper (also a parent) isn't a child of another parent.
parentTypes.add(parentFieldMapper.type());
}
}
}
if (parentChildIndexFieldData == null) {
throw new QueryParsingException(parseContext.index(), "[has_parent] no _parent field configured");
}
Filter parentFilter = null;
if (parentTypes.size() == 1) {
DocumentMapper documentMapper = parseContext.mapperService().documentMapper(parentTypes.iterator().next());
if (documentMapper != null) {
parentFilter = documentMapper.typeFilter();
}
} else {
XBooleanFilter parentsFilter = new XBooleanFilter();
for (String parentTypeStr : parentTypes) {
DocumentMapper documentMapper = parseContext.mapperService().documentMapper(parentTypeStr);
if (documentMapper != null) {
parentsFilter.add(documentMapper.typeFilter(), BooleanClause.Occur.SHOULD);
}
}
parentFilter = parentsFilter;
}
if (parentFilter == null) {
return null;
}
// wrap the query with type query
innerQuery = new XFilteredQuery(innerQuery, parseContext.cacheFilter(parentDocMapper.typeFilter(), null));
Filter childrenFilter = parseContext.cacheFilter(new NotFilter(parentFilter), null);
if (score) {
return new ParentQuery(parentChildIndexFieldData, innerQuery, parentDocMapper.type(), childrenFilter);
} else {
return new ParentConstantScoreQuery(parentChildIndexFieldData, innerQuery, parentDocMapper.type(), childrenFilter);
}
}
}
