Package org.apache.lucene.queryParser

Source Code of org.apache.lucene.queryParser.ExistsFieldQueryExtension

/*
* 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);
    }
}
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