com.stratio.datasource.schema.RowConverter.scala Maven / Gradle / Ivy

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/**
 * Copyright (C) 2015 Stratio (http://stratio.com)
 *
 * 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 com.stratio.datasource.schema

import org.apache.spark.rdd.RDD
import org.apache.spark.sql.Row
import org.apache.spark.sql.types.StructType

/**
 * Knows how to map from some Data Source native RDD to an {{{RDD[Row]}}}
 * @tparam T Original RDD type
 */
trait RowConverter[T] {

  /**
   * Given a known schema,
   * it maps an RDD of some specified type to an {{{RDD[Row}}}
   * @param schema RDD native schema
   * @param rdd Current native RDD
   * @return A brand new RDD of Spark SQL Row type.
   */
  def asRow(schema: StructType, rdd: RDD[T]): RDD[Row]

}