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DataTypeConverter.scala
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DataTypeConverter.scala
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/*
* Copyright 2019 ABSA Group Limited
*
* 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 za.co.absa.spline.harvester.converter
import org.apache.spark.sql.{types => st}
import za.co.absa.spline.commons.lang.Converter
import za.co.absa.spline.harvester.DataTypeIdGenerator
import za.co.absa.spline.model.dt._
class DataTypeConverter(idGen: DataTypeIdGenerator) extends Converter {
override type From = (st.DataType, Boolean)
override type To = DataType
override def convert(arg: From): DataType = {
val (sparkDataType, nullable) = arg
sparkDataType match {
case structType: st.StructType =>
Struct(idGen.nextId(), structType.fields.map(field =>
StructField(field.name, convert(field.dataType -> field.nullable).id)), nullable)
case arrayType: st.ArrayType =>
Array(idGen.nextId(), convert(arrayType.elementType -> arrayType.containsNull).id, nullable)
case otherType: st.DataType =>
Simple(idGen.nextId(), otherType.simpleString, nullable)
}
}
final def convert(sparkDataType: st.DataType, nullable: Boolean): DataType = convert(sparkDataType -> nullable)
}