/* This file is part of VoltDB.
* Copyright (C) 2008-2017 VoltDB Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
//
// Returns the N first winning states for each contestant
//
package voter.procedures;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import org.voltdb.ProcInfo;
import org.voltdb.SQLStmt;
import org.voltdb.VoltProcedure;
import org.voltdb.VoltTable;
import org.voltdb.VoltType;
@ProcInfo (
singlePartition = false
)
public class ContestantWinningStates extends VoltProcedure
{
public final SQLStmt resultStmt = new SQLStmt( "SELECT contestant_number, state, SUM(num_votes) AS num_votes FROM v_votes_by_contestant_number_state GROUP BY contestant_number, state ORDER BY 2 ASC, 3 DESC;");
static class Result
{
public final String State;
public final long Votes;
public Result(String state, long votes)
{
this.State = state;
this.Votes = votes;
}
}
static class OrderByVotesDesc implements Comparator<Result>
{
@Override
public int compare(Result a, Result b)
{
long numVotesA = a.Votes;
long numVotesB = b.Votes;
if (numVotesA > numVotesB)
return -1;
else if (numVotesA < numVotesB)
return 1;
else
return 0;
}
}
public VoltTable run(int contestantNumber, int max)
{
ArrayList<Result> results = new ArrayList<Result>();
voltQueueSQL(resultStmt);
VoltTable summary = voltExecuteSQL()[0];
String state = "";
while(summary.advanceRow()) {
if (!summary.getString(1).equals(state)) {
state = summary.getString(1);
if (summary.getLong(0) == contestantNumber)
results.add(new Result(state, summary.getLong(2)));
}
}
Result[] resultArray = (Result[])results.toArray();
Arrays.sort(resultArray, new OrderByVotesDesc());
VoltTable result = new VoltTable(new VoltTable.ColumnInfo("state",VoltType.STRING), new VoltTable.ColumnInfo("num_votes",VoltType.BIGINT));
for(int i=0;i<Math.min(resultArray.length,max);i++)
result.addRow(new Object[] { resultArray[i].State, resultArray[i].Votes });
return result;
}
}