/**
* This software is licensed to you under the Apache License, Version 2.0 (the
* "Apache License").
*
* LinkedIn's contributions are made under the Apache License. If you contribute
* to the Software, the contributions will be deemed to have been made under the
* Apache License, unless you expressly indicate otherwise. Please do not make any
* contributions that would be inconsistent with the Apache License.
*
* You may obtain a copy of the Apache License at http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, this software
* distributed under the Apache License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Apache
* License for the specific language governing permissions and limitations for the
* software governed under the Apache License.
*
* © 2012 LinkedIn Corp. All Rights Reserved.
*/
package com.senseidb.search.query;
import java.util.ArrayList;
import org.apache.lucene.search.DisjunctionMaxQuery;
import org.apache.lucene.search.Query;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class DistMaxQueryConstructor extends QueryConstructor {
private TermQueryConstructor termQueryConstructor = new TermQueryConstructor();
public static final String QUERY_TYPE = "dis_max";
@Override
public Query doConstructQuery(JSONObject jsonQuery) throws JSONException
{
// "dis_max" : {
// "tie_breaker" : 0.7,
// "boost" : 1.2,
// "queries" : [
// {
// "term" : { "age" : 34 }
// },
// {
// "term" : { "age" : 35 }
// }
// ]
// },
JSONArray jsonArray = jsonQuery.getJSONArray(QUERIES_PARAM);
ArrayList<Query> ar = new ArrayList<Query>();
for(int i = 0; i<jsonArray.length(); i++){
JSONObject json = jsonArray.getJSONObject(i).getJSONObject(TERM_PARAM);
ar.add(termQueryConstructor.doConstructQuery(json));
}
float tieBreakerMultiplier = (float) jsonQuery.optDouble(TIE_BREAKER_PARAM, .0);
float boost = (float) jsonQuery.optDouble(BOOST_PARAM, 1.0);
Query dmq = new DisjunctionMaxQuery(ar, tieBreakerMultiplier);
dmq.setBoost(boost);
return dmq;
}
}