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XMLPlugin.scala
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XMLPlugin.scala
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/*
* Copyright 2020 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.plugin.embedded
import org.apache.spark.sql.execution.datasources.LogicalRelation
import org.apache.spark.sql.sources.BaseRelation
import za.co.absa.spline.commons.reflect.ReflectionUtils.extractValue
import za.co.absa.spline.commons.reflect.extractors.SafeTypeMatchingExtractor
import za.co.absa.spline.harvester.builder.SourceIdentifier
import za.co.absa.spline.harvester.plugin.Plugin.{Precedence, ReadNodeInfo}
import za.co.absa.spline.harvester.plugin.embedded.XMLPlugin._
import za.co.absa.spline.harvester.plugin.{BaseRelationProcessing, Plugin}
import za.co.absa.spline.harvester.qualifier.PathQualifier
import javax.annotation.Priority
@Priority(Precedence.Normal)
class XMLPlugin(pathQualifier: PathQualifier) extends Plugin with BaseRelationProcessing {
override def baseRelationProcessor: PartialFunction[(BaseRelation, LogicalRelation), ReadNodeInfo] = {
case (`_: XmlRelation`(xr), _) =>
val parameters = extractValue[Map[String, String]](xr, "parameters")
val location = extractValue[Option[String]](xr, "location")
val qualifiedPaths = location.toSeq.map(pathQualifier.qualify)
ReadNodeInfo(asSourceId(qualifiedPaths), parameters)
}
}
object XMLPlugin {
private object `_: XmlRelation` extends SafeTypeMatchingExtractor[AnyRef]("com.databricks.spark.xml.XmlRelation")
private def asSourceId(paths: Seq[String]) = SourceIdentifier(Some("xml"), paths: _*)
}