/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 com.aliyun.odps.lot.operators;
import java.util.ArrayList;
import java.util.List;
import com.aliyun.odps.lot.common.ArgumentNullException;
import com.aliyun.odps.lot.common.Reference;
import apsara.odps.lot.DistributeByProtos;
import apsara.odps.lot.Lot;
public class DistributeBy extends Operator {
List<Reference> columns = new ArrayList<Reference>();
public List<Reference> getColumns() {
return columns;
}
@Override
public Lot.LogicalOperator toProtoBuf() {
assert (getParents().size() == 1);
Lot.LogicalOperator.Builder builder = Lot.LogicalOperator.newBuilder();
DistributeByProtos.DistributeBy.Builder db = DistributeByProtos.DistributeBy.newBuilder();
db.setId(getId());
db.setParentId(getParents().get(0).getId());
for (Reference col : columns) {
db.addColumns(col.toProtoBuf().getReference());
}
builder.setDistributeBy(db.build());
return builder.build();
}
public DistributeBy(List<Reference> columns) {
if (columns == null) {
throw new ArgumentNullException("columns");
}
if (columns.size() == 0) {
throw new IllegalArgumentException("You have to specify one column at least.");
}
this.columns = columns;
}
}