/*
* 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 apsara.odps.lot.LimitProtos;
import apsara.odps.lot.Lot;
public class Limit extends Operator {
private long count;
public Limit(long count) {
if (count <= 0) {
throw new IllegalArgumentException("Parameter 'count' should be greater than 0.");
}
this.count = count;
}
@Override
public Lot.LogicalOperator toProtoBuf() {
assert (getParents().size() == 1);
Lot.LogicalOperator.Builder builder = Lot.LogicalOperator.newBuilder();
LimitProtos.Limit.Builder limit = LimitProtos.Limit.newBuilder();
limit.setId(getId());
limit.setParentId(getParents().get(0).getId());
limit.setCount(count);
builder.setLimit(limit.build());
return builder.build();
}
}