/*
* 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.Filter;
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.query.support.XContentStructure;
import org.elasticsearch.index.search.child.CustomQueryWrappingFilter;
import java.io.IOException;
import static org.elasticsearch.index.query.HasParentQueryParser.createParentQuery;
import static org.elasticsearch.index.query.QueryParserUtils.ensureNotDeleteByQuery;
/**
*
*/
public class HasParentFilterParser implements FilterParser {
public static final String NAME = "has_parent";
@Inject
public HasParentFilterParser() {
}
@Override
public String[] names() {
return new String[]{NAME, Strings.toCamelCase(NAME)};
}
@Override
public Filter parse(QueryParseContext parseContext) throws IOException, QueryParsingException {
ensureNotDeleteByQuery(NAME, parseContext);
XContentParser parser = parseContext.parser();
boolean queryFound = false;
boolean filterFound = false;
String parentType = null;
String filterName = null;
String currentFieldName = null;
XContentParser.Token token;
XContentStructure.InnerQuery iq = null;
XContentStructure.InnerFilter innerFilter = 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, parentType == null ? null : new String[] {parentType});
queryFound = true;
} else if ("filter".equals(currentFieldName)) {
innerFilter = new XContentStructure.InnerFilter(parseContext, parentType == null ? null : new String[] {parentType});
filterFound = true;
} else {
throw new QueryParsingException(parseContext.index(), "[has_parent] filter does not support [" + currentFieldName + "]");
}
} else if (token.isValue()) {
if ("type".equals(currentFieldName) || "parent_type".equals(currentFieldName) || "parentType".equals(currentFieldName)) {
parentType = parser.text();
} else if ("_name".equals(currentFieldName)) {
filterName = parser.text();
} else if ("_cache".equals(currentFieldName)) {
// noop to be backwards compatible
} else if ("_cache_key".equals(currentFieldName) || "_cacheKey".equals(currentFieldName)) {
// noop to be backwards compatible
} else {
throw new QueryParsingException(parseContext.index(), "[has_parent] filter does not support [" + currentFieldName + "]");
}
}
}
if (!queryFound && !filterFound) {
throw new QueryParsingException(parseContext.index(), "[has_parent] filter requires 'query' or 'filter' field");
}
if (parentType == null) {
throw new QueryParsingException(parseContext.index(), "[has_parent] filter requires 'parent_type' field");
}
Query innerQuery;
if (queryFound) {
innerQuery = iq.asQuery(parentType);
} else {
innerQuery = innerFilter.asFilter(parentType);
}
if (innerQuery == null) {
return null;
}
Query parentQuery = createParentQuery(innerQuery, parentType, false, parseContext);
if (parentQuery == null) {
return null;
}
if (filterName != null) {
parseContext.addNamedFilter(filterName, new CustomQueryWrappingFilter(parentQuery));
}
return new CustomQueryWrappingFilter(parentQuery);
}
}