/**
* 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.req.mapred.functions;
import java.util.List;
import javax.management.RuntimeErrorException;
import org.json.JSONException;
import org.json.JSONObject;
import com.senseidb.search.req.mapred.CombinerStage;
import com.senseidb.search.req.mapred.FacetCountAccessor;
import com.senseidb.search.req.mapred.FieldAccessor;
import com.senseidb.search.req.mapred.SenseiMapReduce;
import com.senseidb.util.JSONUtil.FastJSONArray;
import com.senseidb.util.JSONUtil.FastJSONObject;
public class SumMapReduce implements SenseiMapReduce<Double, Double> {
private String column;
@Override
public void init(JSONObject params) {
column = params.optString("column");
if (column == null) {
throw new IllegalStateException("Column parameter shouldn't be null");
}
}
@Override
public Double map(int[] docIds, int docIdCount, long[] uids, FieldAccessor accessor, FacetCountAccessor facetCountAccessor) {
double ret = 0;
for (int i = 0; i < docIdCount; i++) {
ret += accessor.getDouble(column, docIds[i]);
}
return ret;
}
@Override
public List<Double> combine(List<Double> mapResults, CombinerStage combinerStage) {
double ret = 0;
for (Double count : mapResults) {
ret += count;
}
mapResults.clear();
mapResults.add(ret);
return mapResults;
}
@Override
public Double reduce(List<Double> combineResults) {
double ret = 0;
for (Double count : combineResults) {
ret += count;
}
return ret;
}
@Override
public JSONObject render(Double reduceResult) {
try {
return new FastJSONObject().put("sum", reduceResult);
} catch (JSONException e) {
throw new RuntimeException(e);
}
}
@Override
public String[] getColumns() {
return new String[]{column};
}
}