content: /*
   * 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 com.aliyun.odps.lot.common.ArgumentNullException;
  import com.aliyun.odps.lot.common.ScalarExpression;
  
  import apsara.odps.lot.FilterProtos;
  import apsara.odps.lot.Lot;
  
  public class Filter extends Operator {
  
    private ScalarExpression condition;
  
    public ScalarExpression getCondition() {
      return condition;
    }
  
    public Filter(ScalarExpression condition) {
      if (condition == null) {
        throw new ArgumentNullException("condition");
  
      }
      this.condition = condition;
    }
  
    @Override
    public Lot.LogicalOperator toProtoBuf() {
      assert (getParents().size() == 1);
  
      Lot.LogicalOperator.Builder builder = Lot.LogicalOperator.newBuilder();
      FilterProtos.Filter.Builder f = FilterProtos.Filter.newBuilder();
      f.setId(getId());
      f.setParentId(getParents().get(0).getId());
      f.setCondition(condition.toProtoBuf());
      builder.setFilter(f.build());
  
      return builder.build();
    }
  }
  