/*
* 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.apache.lucene.queryParser;
import org.apache.lucene.search.DeletionAwareConstantScoreQuery;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermRangeFilter;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.index.query.QueryParseContext;
import static org.elasticsearch.index.query.support.QueryParsers.*;
/**
* @author kimchy (shay.banon)
*/
public class ExistsFieldQueryExtension implements FieldQueryExtension {
public static final String NAME = "_exists_";
@Override public Query query(QueryParseContext parseContext, String queryText) {
String fieldName = queryText;
Filter filter = null;
MapperService.SmartNameFieldMappers smartNameFieldMappers = parseContext.smartFieldMappers(fieldName);
if (smartNameFieldMappers != null) {
if (smartNameFieldMappers.hasMapper()) {
filter = smartNameFieldMappers.mapper().rangeFilter(null, null, true, true);
}
}
if (filter == null) {
filter = new TermRangeFilter(fieldName, null, null, true, true);
}
// we always cache this one, really does not change...
filter = parseContext.cacheFilter(filter, null);
filter = wrapSmartNameFilter(filter, smartNameFieldMappers, parseContext);
return new DeletionAwareConstantScoreQuery(filter);
}
}