JarCastingSangria Amazon Ion marshalling.
SBT Configuration:
libraryDependencies += "org.sangria-graphql" %% "sangria-ion" % "1.0.0"
Example
Here is small example of how you can use it, which also demonstrates custom scalar values that are natively supported by Ion.
First let's define the scalar values:
val dateFormat = new SimpleDateFormat("yyyy-MM-dd")
case object DateCoercionViolation extends ValueCoercionViolation("Date value expected")
case object BinaryCoercionViolation extends ValueCoercionViolation("Binary data is not supported as input")
def parseDate(s: String) = Try(dateFormat.parse(s)) match {
case Success(d) ⇒ Right(d)
case Failure(error) ⇒ Left(DateCoercionViolation)
}
val DateType = ScalarType[Date]("Date",
coerceOutput = (d, caps) ⇒
if (caps.contains(DateSupport)) d
else dateFormat.format(d),
coerceUserInput = {
case s: String ⇒ parseDate(s)
case _ ⇒ Left(DateCoercionViolation)
},
coerceInput = {
case ast.StringValue(s, _) ⇒ parseDate(s)
case _ ⇒ Left(DateCoercionViolation)
})
val BlobType = ScalarType[Array[Byte]]("Blob",
coerceOutput = (d, _) ⇒ d,
coerceUserInput = _ ⇒ Left(BinaryCoercionViolation),
coerceInput = _ ⇒ Left(BinaryCoercionViolation))
val ClobType = ScalarType[Array[Byte]]("Clob",
coerceOutput = (d, _) ⇒ d,
coerceUserInput = _ ⇒ Left(BinaryCoercionViolation),
coerceInput = _ ⇒ Left(BinaryCoercionViolation),
scalarInfo = Set(IonClobScalar))
Please notice that Date type produces java.util.Date only when this capability is supported by the marshaller. Otherwise it produces a String alternative. Clob type also instructs marshaller to to use Ion clob type instead of blob for a byte array.
In order to use Ion marshalling, you also need an implicit instance of IonSystem in scope:
import sangria.marshalling.ion._
implicit val ionSystem = IonSystemBuilder.standard().build()
val result: Future[IonValue] = Executor.execute(schema, query)
Now you should be able to write IonValue to a binary or a text format.
License
sangria-ion is licensed under Apache License, Version 2.0.
