/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.ConstantScoreQuery;
import org.apache.lucene.search.FilteredQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.search.child.HasChildFilter;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
/**
* @author kimchy (shay.banon)
*/
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 {
XContentParser parser = parseContext.parser();
Query query = null;
float boost = 1.0f;
String childType = null;
String scope = null;
String currentFieldName = null;
XContentParser.Token token;
while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
if (token == XContentParser.Token.FIELD_NAME) {
currentFieldName = parser.currentName();
} else if (token == XContentParser.Token.START_OBJECT) {
if ("query".equals(currentFieldName)) {
query = parseContext.parseInnerQuery();
}
} else if (token.isValue()) {
if ("type".equals(currentFieldName)) {
childType = parser.text();
} else if ("_scope".equals(currentFieldName)) {
scope = parser.text();
} else if ("boost".equals(currentFieldName)) {
boost = parser.floatValue();
}
}
}
if (query == null) {
throw new QueryParsingException(parseContext.index(), "[has_child] requires 'query' field");
}
if (childType == null) {
throw new QueryParsingException(parseContext.index(), "[has_child] requires 'type' field");
}
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() == null) {
throw new QueryParsingException(parseContext.index(), "[has_child] Type [" + childType + "] does not have parent mapping");
}
String parentType = childDocMapper.parentFieldMapper().type();
query.setBoost(boost);
// wrap the query with type query
query = new FilteredQuery(query, parseContext.cacheFilter(childDocMapper.typeFilter(), null));
SearchContext searchContext = SearchContext.current();
HasChildFilter childFilter = new HasChildFilter(query, scope, childType, parentType, searchContext);
// we don't need DeletionAwareConstantScore, since we filter deleted parent docs in the filter
ConstantScoreQuery childQuery = new ConstantScoreQuery(childFilter);
childQuery.setBoost(boost);
searchContext.addScopePhase(childFilter);
return childQuery;
}
}