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Apache Solr (module: core)
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.solr.search;

import org.apache.lucene.queries.function.FunctionQuery;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.queries.function.valuesource.QueryValueSource;
import org.apache.lucene.search.Query;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.search.function.ValueSourceRangeFilter;

/**
 * Create a range query over a function. 

 * Other parameters: 

 * l, the lower bound, optional) 

 * u, the upper bound, optional) 

 * incl, include the lower bound: true/false, optional, default=true 

 * incu, include the upper bound: true/false, optional, default=true 

 * Example: {!frange l=1000 u=50000}myfield 

 * Filter query example: fq={!frange l=0 u=2.2}sum(user_ranking,editor_ranking)
 */
public class FunctionRangeQParserPlugin extends QParserPlugin {
  public static final String NAME = "frange";

  @Override
  public QParser createParser(
      String qstr, SolrParams localParams, SolrParams params, SolrQueryRequest req) {
    return new QParser(qstr, localParams, params, req) {
      ValueSource vs;
      String funcStr;

      @Override
      public Query parse() throws SyntaxError {
        funcStr = localParams.get(QueryParsing.V, null);
        QParser subParser = subQuery(funcStr, FunctionQParserPlugin.NAME);
        subParser.setIsFilter(
            false); // the range can be based on the relevancy score of embedded queries.
        Query funcQ = subParser.getQuery();
        if (funcQ instanceof FunctionQuery) {
          vs = ((FunctionQuery) funcQ).getValueSource();
        } else {
          vs = new QueryValueSource(funcQ, 0.0f);
        }

        String l = localParams.get("l");
        String u = localParams.get("u");
        boolean includeLower = localParams.getBool("incl", true);
        boolean includeUpper = localParams.getBool("incu", true);

        // TODO: add a score=val option to allow score to be the value
        ValueSourceRangeFilter rf =
            new ValueSourceRangeFilter(vs, l, u, includeLower, includeUpper);
        FunctionRangeQuery frq = new FunctionRangeQuery(rf);
        return frq;
      }
    };
  }
}