/*
Copyright 2010 Nathan Marz
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cascalog.test;
import cascading.flow.FlowProcess;
import cascading.operation.AggregatorCall;
import cascading.tuple.Tuple;
import cascalog.CascalogAggregator;
public class SumAgg extends CascalogAggregator {
@Override
public void start(FlowProcess flowProcess, AggregatorCall aggregatorCall) {
aggregatorCall.setContext(0);
}
@Override
public void aggregate(FlowProcess flowProcess, AggregatorCall aggregatorCall) {
int sum = (Integer) aggregatorCall.getContext();
sum += aggregatorCall.getArguments().getInteger(0);
aggregatorCall.setContext(sum);
}
@Override
public void complete(FlowProcess flowProcess, AggregatorCall aggregatorCall) {
int sum = (Integer) aggregatorCall.getContext();
aggregatorCall.getOutputCollector().add(new Tuple(sum));
}
}