java.beans.Introspector Scala Examples

The following examples show how to use java.beans.Introspector. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example.
Example 1
Source File: ObjectMapper.scala    From infinispan-spark   with Apache License 2.0 5 votes vote down vote up 
package org.infinispan.spark.sql

import java.beans.Introspector

import org.apache.spark.sql.Row
import org.apache.spark.sql.catalyst.CatalystTypeConverters
import org.apache.spark.sql.catalyst.expressions.{AttributeReference, GenericRowWithSchema}
import org.apache.spark.sql.types.StructType


object ObjectMapper {

   def forBean(schema: StructType, beanClass: Class[_]): (AnyRef, Array[String]) => Row = {
      val beanInfo = Introspector.getBeanInfo(beanClass)
      val attrs = schema.fields.map(f => AttributeReference(f.name, f.dataType, f.nullable)())
      val extractors = beanInfo.getPropertyDescriptors.filterNot(_.getName == "class").map(_.getReadMethod)
      val methodsToConverts = extractors.zip(attrs).map { case (e, attr) =>
         (e, CatalystTypeConverters.createToCatalystConverter(attr.dataType))
      }
      (from: Any, columns: Array[String]) => {
         if (columns.nonEmpty) {
            from match {
               case _: Array[_] => new GenericRowWithSchema(from.asInstanceOf[Array[Any]], schema)
               case f: Any =>
                  val rowSchema = StructType(Array(schema(columns.head)))
                  new GenericRowWithSchema(Array(f), rowSchema)
            }
         } else {
            new GenericRowWithSchema(methodsToConverts.map { case (e, convert) =>
               val invoke: AnyRef = e.invoke(from)
               convert(invoke)
            }, schema)

         }
      }
   }

}