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io.minio.spark.select.SelectCSVSource.scala Maven / Gradle / Ivy
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/*
* Copyright 2018 Minio, Inc.
*
* 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 io.minio.spark.select
// Java standard libraries
import java.io.File
// Spark internal libraries
import org.apache.spark.sql.SQLContext
import org.apache.spark.sql.sources.{BaseRelation, RelationProvider, SchemaRelationProvider}
import org.apache.spark.sql.types.StructType
import org.apache.spark.sql.sources.DataSourceRegister
class SelectCSVSource
extends SchemaRelationProvider
with DataSourceRegister {
private def checkPath(parameters: Map[String, String]): String = {
parameters.getOrElse("path", sys.error("'path' must be specified for CSV data."))
}
/**
* Short alias for spark-select data source.
*/
override def shortName(): String = "minioSelectCSV"
override def createRelation(sqlContext: SQLContext, params: Map[String, String], schema: StructType): SelectCSVRelation = {
val path = checkPath(params)
SelectCSVRelation(Some(path), params, schema)(sqlContext)
}
}
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