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.common;
  
  import com.aliyun.odps.lot.operators.Operator;
  
  import apsara.odps.lot.ExpressionProtos;
  
  public class Reference extends ScalarExpression {
  
    private String name;
    private Operator from;
  
    public String getName() {
      return name;
    }
  
    public Operator getFrom() {
      return from;
    }
  
    public Reference(String name, Operator from) {
  
      this.name = name;
      this.from = from;
    }
  
    @Override
    public ExpressionProtos.ScalarExpression toProtoBuf() {
      ExpressionProtos.ScalarExpression.Builder
          builder =
          ExpressionProtos.ScalarExpression.newBuilder();
      apsara.odps.ExpressionProtos.Reference.Builder
          r =
          apsara.odps.ExpressionProtos.Reference.newBuilder();
      r.setName(name);
      r.setFrom(getFrom().getId());
      builder.setReference(r.build());
      return builder.build();
    }
  }
  