org.elasticsearch.index.query.TopChildrenQueryParser Maven / Gradle / Ivy
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* Licensed to Elastic Search and Shay Banon under one
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* 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
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* 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.Query;
import org.elasticsearch.ElasticSearchIllegalStateException;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.lucene.search.XFilteredQuery;
import org.elasticsearch.common.xcontent.XContentParser;
import org.elasticsearch.index.mapper.DocumentMapper;
import org.elasticsearch.index.search.child.ScoreType;
import org.elasticsearch.index.search.child.TopChildrenQuery;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
/**
*
*/
public class TopChildrenQueryParser implements QueryParser {
public static final String NAME = "top_children";
@Inject
public TopChildrenQueryParser() {
}
@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;
boolean queryFound = false;
float boost = 1.0f;
String childType = null;
ScoreType scoreType = ScoreType.MAX;
int factor = 5;
int incrementalFactor = 2;
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)) {
queryFound = true;
// TODO we need to set the type, but, `query` can come before `type`... (see HasChildFilterParser)
// since we switch types, make sure we change the context
String[] origTypes = QueryParseContext.setTypesWithPrevious(childType == null ? null : new String[]{childType});
try {
query = parseContext.parseInnerQuery();
} finally {
QueryParseContext.setTypes(origTypes);
}
} else {
throw new QueryParsingException(parseContext.index(), "[top_children] query does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("type".equals(currentFieldName)) {
childType = parser.text();
} else if ("_scope".equals(currentFieldName)) {
throw new QueryParsingException(parseContext.index(), "the [_scope] support in [top_children] query has been removed, use a filter as a facet_filter in the relevant global facet");
} else if ("score".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 ("factor".equals(currentFieldName)) {
factor = parser.intValue();
} else if ("incremental_factor".equals(currentFieldName) || "incrementalFactor".equals(currentFieldName)) {
incrementalFactor = parser.intValue();
} else {
throw new QueryParsingException(parseContext.index(), "[top_children] query does not support [" + currentFieldName + "]");
}
}
}
if (!queryFound) {
throw new QueryParsingException(parseContext.index(), "[top_children] requires 'query' field");
}
if (childType == null) {
throw new QueryParsingException(parseContext.index(), "[top_children] requires 'type' field");
}
if (query == null) {
return null;
}
DocumentMapper childDocMapper = parseContext.mapperService().documentMapper(childType);
if (childDocMapper == null) {
throw new QueryParsingException(parseContext.index(), "No mapping for for type [" + childType + "]");
}
if (childDocMapper.parentFieldMapper() == null) {
throw new QueryParsingException(parseContext.index(), "Type [" + childType + "] does not have parent mapping");
}
String parentType = childDocMapper.parentFieldMapper().type();
query.setBoost(boost);
// wrap the query with type query
query = new XFilteredQuery(query, parseContext.cacheFilter(childDocMapper.typeFilter(), null));
SearchContext searchContext = SearchContext.current();
if (searchContext == null) {
throw new ElasticSearchIllegalStateException("[top_children] Can't execute, search context not set.");
}
TopChildrenQuery childQuery = new TopChildrenQuery(searchContext, query, childType, parentType, scoreType, factor, incrementalFactor);
searchContext.addRewrite(childQuery);
return childQuery;
}
}