How to parse list of dictionaries as string in scala? - scala

Question

I am trying to parse list of dictionaries(which is in string) inside scala. Basically i want to build another list so that i can traverse through the list using a for loop.
When i have one single list of dictionaries it works fine.
class CC[T] { def unapply(a:Any):Option[T] = Some(a.asInstanceOf[T]) }
object M extends CC[Map[String, Any]]
object A extends CC[List[Any]] //for s3
object I extends CC[Double]
object S extends CC[String]
object E extends CC[String]
object F extends CC[String]
object G extends CC[Map[String, Any]]
val jsonString =
"""
{
"index": 1,
"source": "a",
"name": "v",
"s3": [{
"path": "s3://1",
"bucket": "p",
"key": "r"
}]
}
""".stripMargin
//println(List(JSON.parseFull(jsonString)))
val result = for {
Some(M(map)) <- List(JSON.parseFull(jsonString))
//L(text) = map("text")
//M(texts) <- text
I(index) = map("index")
S(source) = map("source")
N(name) = map("name")
A(s3q)=map("s3")
G(s3data) <- s3q
F(path) = s3data("path")
} yield {
(index.toInt,source,name,path)
}
But when i aded another list, it gives error stating "java.lang.ClassCastException: scala.collection.immutable.$colon$colon cannot be cast to scala.collection.immutable.Map"
class CC[T] { def unapply(a:Any):Option[T] = Some(a.asInstanceOf[T]) }
object M extends CC[Map[String, Any]]
object A extends CC[List[Any]] //for s3
object I extends CC[Double]
object S extends CC[String]
object E extends CC[String]
object F extends CC[String]
object G extends CC[Map[String, Any]]
val jsonString =
"""
[{
"index": 1,
"source": "a",
"name": "v",
"s3": [{
"path": "s3://1",
"bucket": "p",
"key": "r"
}]
},{
"index": 1,
"source": "a",
"name": "v",
"s3": [{
"path": "s3://1",
"bucket": "p",
"key": "r"
}]
}]
""".stripMargin
//println(List(JSON.parseFull(jsonString)))
val result = for {
Some(M(map)) <- List(JSON.parseFull(jsonString))
//L(text) = map("text")
//M(texts) <- text
I(index) = map("index")
S(source) = map("source")
N(name) = map("name")
A(s3q)=map("s3")
G(s3data) <- s3q
F(path) = s3data("path")
} yield {
(index.toInt,source,name,path)
}