How call method based on Json Object scala spark?

I Have two functions like below

def method1(ip:String,r:Double,op:String)={
val data = spark.read.option("header", true).csv(ip).toDF()
val r3= data.select("c", "S").dropDuplicates("C", "S").withColumn("R", lit(r))
r3.coalesce(1).write.format("com.databricks.spark.csv").option("header", "true").save(op)
}

def method2(ip:String,op:String)={
val data = spark.read.option("header", true).csv(ip).toDF()
val r3= data.select("c", "S").dropDuplicates("C", "StockCode")
r3.coalesce(1).write.format("com.databricks.spark.csv").option("header", "true").save(op)
}

I want to call this methods by based on Json object parameter . for example if my input json is like below

{"name":"method1","ip":"Or.csv","r":1.0,"op":"oppath"}

It has to call method1 and "Or.csv",1.0,”oppath" as parameters I.e. in json object name indicate method name, and reaming fields are parameters.

Please help me on this.

First we need to read Json through spark into a dataframe.

val df = sqlContext.read.json("path to the json file")

which should be give you dataframe as

scala> df.show()
+------+-------+------+---+
|    ip|   name|    op|  r|
+------+-------+------+---+
|Or.csv|method1|oppath|1.0|
+------+-------+------+---+

   scala> def method1(ip:String,r:Double,op:String)={
         | val data = spark.read.option("header", true).csv(ip).toDF()
         | val r3= data.select("c", "S").dropDuplicates("C", "S").withColumn("R", lit(r))
         | r3.coalesce(1).write.format("com.databricks.spark.csv").option("header", "true").save(op)
         | }

method1: (ip: String, r: Double, op: String)Unit

   scala> def method2(ip:String,op:String)={
         | val data = spark.read.option("header", true).csv(ip).toDF()
         | val r3= data.select("c", "S").dropDuplicates("C", "StockCode")
         | r3.coalesce(1).write.format("com.databricks.spark.csv").option("header", "true").save(op)
         | }

method2: (ip: String, op: String)Unit

scala>df.withColumn("methodCalling",when($"name" === "method1",method1(df.first().getString(1),df.first().getDouble(2),df.first().getString(3))).otherwise(when($"name" === "method2", method2(df.first().getString(1),df.first().getString(2)))))

it will call method1 or method2 based on Json Object.