com.dimajix.spark.sql.sources.empty.NullFormat.scala Maven / Gradle / Ivy

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/*
 * Copyright (C) 2018 The Flowman Authors
 *
 * 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.dimajix.spark.sql.sources.empty

import scala.collection.immutable.Map

import org.apache.spark.sql.DataFrame
import org.apache.spark.sql.SQLContext
import org.apache.spark.sql.SaveMode
import org.apache.spark.sql.sources.BaseRelation
import org.apache.spark.sql.sources.CreatableRelationProvider
import org.apache.spark.sql.sources.DataSourceRegister
import org.apache.spark.sql.sources.SchemaRelationProvider
import org.apache.spark.sql.types.StructType

class NullFormat extends DataSourceRegister with SchemaRelationProvider with CreatableRelationProvider {
    override def shortName = "null"

    override def toString = "NullFormat"

    override def createRelation(sqlContext: SQLContext, parameters: Map[String, String], schema: StructType): BaseRelation = {
        new NullRelation(sqlContext, schema)
    }

    override def createRelation(sqlContext: SQLContext, mode: SaveMode, parameters: Map[String, String], data: DataFrame): BaseRelation = {
        data.foreach(_ => ())
        new NullRelation(sqlContext, data.schema)
    }
}