spray.json.lenses.Operations.scala Maven / Gradle / Ivy
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package spray.json
package lenses
/**
* Defines a set of operations to update Json values.
*/
trait Operations extends OptionalFieldOperations { _: ExtraImplicits ⇒
/**
* The set operation sets or creates a value.
*/
def set[T: JsonWriter](t: ⇒ T): Operation = new Operation {
def apply(value: SafeJsValue): SafeJsValue =
// ignore existence of old value
Right(t.toJson)
}
/**
* A MapOperation is one that expect an old value to be available.
*/
trait MapOperation extends Operation {
def apply(value: JsValue): SafeJsValue
def apply(value: SafeJsValue): SafeJsValue = value.flatMap(apply)
}
/**
* The `modify` operation applies a function on the (converted) value
*/
def modify[T: Reader: JsonWriter](f: T ⇒ T): Operation = new MapOperation {
def apply(value: JsValue): SafeJsValue =
value.as[T] map (v ⇒ f(v).toJson)
}
def append(update: Update): Operation = ???
def update(update: Update): Operation = ???
def extract[M[_], T](value: Lens[M])(f: M[T] ⇒ Update): Operation = ???
}
object Operations extends Operations with ExtraImplicits
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