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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.FilteredQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.join.BitDocIdSetFilter;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
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.XContentStructure;
import org.elasticsearch.index.search.child.ChildrenConstantScoreQuery;
import org.elasticsearch.index.search.child.ChildrenQuery;
import org.elasticsearch.index.search.child.CustomQueryWrappingFilter;
import org.elasticsearch.index.search.child.ScoreType;
import org.elasticsearch.index.search.nested.NonNestedDocsFilter;
import java.io.IOException;
import static org.elasticsearch.index.query.QueryParserUtils.ensureNotDeleteByQuery;
/**
*
*/
public class HasChildQueryParser implements QueryParser {
public static final String NAME = "has_child";
@Inject
public HasChildQueryParser() {
}
@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 childType = null;
ScoreType scoreType = ScoreType.NONE;
int minChildren = 0;
int maxChildren = 0;
int shortCircuitParentDocSet = 8192;
String queryName = 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.<type> facade to parse if available,
// or delay parsing if not.
if ("query".equals(currentFieldName)) {
iq = new XContentStructure.InnerQuery(parseContext, childType == null ? null : new String[] { childType });
queryFound = true;
} else {
throw new QueryParsingException(parseContext.index(), "[has_child] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("type".equals(currentFieldName) || "child_type".equals(currentFieldName) || "childType".equals(currentFieldName)) {
childType = parser.text();
} else if ("score_type".equals(currentFieldName) || "scoreType".equals(currentFieldName)) {
scoreType = ScoreType.fromString(parser.text());
} else if ("score_mode".equals(currentFieldName) || "scoreMode".equals(currentFieldName)) {
scoreType = ScoreType.fromString(parser.text());
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
} else if ("min_children".equals(currentFieldName) || "minChildren".equals(currentFieldName)) {
minChildren = parser.intValue(true);
} else if ("max_children".equals(currentFieldName) || "maxChildren".equals(currentFieldName)) {
maxChildren = parser.intValue(true);
} else if ("short_circuit_cutoff".equals(currentFieldName)) {
shortCircuitParentDocSet = parser.intValue();
} else if ("_name".equals(currentFieldName)) {
queryName = parser.text();
} else {
throw new QueryParsingException(parseContext.index(), "[has_child] query does not support [" + currentFieldName + "]");
}
}
}
if (!queryFound) {
throw new QueryParsingException(parseContext.index(), "[has_child] requires 'query' field");
}
if (childType == null) {
throw new QueryParsingException(parseContext.index(), "[has_child] requires 'type' field");
}
Query innerQuery = iq.asQuery(childType);
if (innerQuery == null) {
return null;
}
innerQuery.setBoost(boost);
DocumentMapper childDocMapper = parseContext.mapperService().documentMapper(childType);
if (childDocMapper == null) {
throw new QueryParsingException(parseContext.index(), "[has_child] No mapping for for type [" + childType + "]");
}
if (!childDocMapper.parentFieldMapper().active()) {
throw new QueryParsingException(parseContext.index(), "[has_child] Type [" + childType + "] does not have parent mapping");
}
ParentFieldMapper parentFieldMapper = childDocMapper.parentFieldMapper();
if (!parentFieldMapper.active()) {
throw new QueryParsingException(parseContext.index(), "[has_child] _parent field not configured");
}
String parentType = parentFieldMapper.type();
DocumentMapper parentDocMapper = parseContext.mapperService().documentMapper(parentType);
if (parentDocMapper == null) {
throw new QueryParsingException(parseContext.index(), "[has_child] Type [" + childType
+ "] points to a non existent parent type [" + parentType + "]");
}
if (maxChildren > 0 && maxChildren < minChildren) {
throw new QueryParsingException(parseContext.index(), "[has_child] 'max_children' is less than 'min_children'");
}
BitDocIdSetFilter nonNestedDocsFilter = null;
if (parentDocMapper.hasNestedObjects()) {
nonNestedDocsFilter = parseContext.bitsetFilter(NonNestedDocsFilter.INSTANCE);
}
// wrap the query with type query
innerQuery = new FilteredQuery(innerQuery, parseContext.cacheFilter(childDocMapper.typeFilter(), null));
Query query;
BitDocIdSetFilter parentFilter = parseContext.bitsetFilter(parentDocMapper.typeFilter());
ParentChildIndexFieldData parentChildIndexFieldData = parseContext.getForField(parentFieldMapper);
if (minChildren > 1 || maxChildren > 0 || scoreType != ScoreType.NONE) {
query = new ChildrenQuery(parentChildIndexFieldData, parentType, childType, parentFilter, innerQuery, scoreType, minChildren,
maxChildren, shortCircuitParentDocSet, nonNestedDocsFilter);
} else {
query = new ChildrenConstantScoreQuery(parentChildIndexFieldData, innerQuery, parentType, childType, parentFilter,
shortCircuitParentDocSet, nonNestedDocsFilter);
}
if (queryName != null) {
parseContext.addNamedFilter(queryName, new CustomQueryWrappingFilter(query));
}
query.setBoost(boost);
return query;
}
}