pigpen.cascading.RankBuffer Maven / Gradle / Ivy
/*
*
* Copyright 2015 Netflix, Inc.
*
* Licensed 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 pigpen.cascading;
import java.util.Iterator;
import cascading.flow.FlowProcess;
import cascading.operation.BaseOperation;
import cascading.operation.Buffer;
import cascading.operation.BufferCall;
import cascading.tuple.Fields;
import cascading.tuple.Tuple;
import cascading.tuple.TupleEntry;
public class RankBuffer extends BaseOperation implements Buffer {
public RankBuffer(Fields fields) {
super(fields);
}
@Override
public void operate(FlowProcess flowProcess, BufferCall bufferCall) {
int rank = 0;
Iterator iterator = bufferCall.getArgumentsIterator();
while (iterator.hasNext()) {
TupleEntry entry = iterator.next();
bufferCall.getOutputCollector().add(new Tuple(rank++, entry.getObject(0)));
}
}
}