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Mathew Polzin
2019-08-05 18:09:29 -07:00
parent 3a60ac5fe2
commit 6c8646a1b4
1 changed files with 14 additions and 14 deletions
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Sources/JSONAPI/Resource/Transformer.swift
+14 -14
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@@ -7,12 +7,12 @@
/// A Transformer simply defines a static function that transforms a value.
public protocol Transformer {
associatedtype From
associatedtype To
associatedtype From
associatedtype To
/// Turn value of type `From` into a value of type `To` or
/// throw an error on failure.
static func transform(_ value: From) throws -> To
static func transform(_ value: From) throws -> To
}
/// ReversibleTransformers define a function that reverses the transform
@@ -20,13 +20,13 @@ public protocol Transformer {
public protocol ReversibleTransformer: Transformer {
/// Turn a value of type `To` into a value of type `From` or
/// throw an error on failure.
static func reverse(_ value: To) throws -> From
static func reverse(_ value: To) throws -> From
}
/// The IdentityTransformer does not perform any transformation on a value.
public enum IdentityTransformer<T>: ReversibleTransformer {
public static func transform(_ value: T) throws -> T { return value }
public static func reverse(_ value: T) throws -> T { return value }
public static func transform(_ value: T) throws -> T { return value }
public static func reverse(_ value: T) throws -> T { return value }
}
// MARK: - Validator
@@ -41,16 +41,16 @@ public protocol Validator: ReversibleTransformer where From == To {
}
extension Validator {
public static func reverse(_ value: To) throws -> To {
let _ = try transform(value)
return value
}
public static func reverse(_ value: To) throws -> To {
let _ = try transform(value)
return value
}
/// Validate the given value and then return it if valid.
/// throws an erro if invalid.
/// - returns: The same value passed in, if it was valid.
public static func validate(_ value: To) throws -> To {
let _ = try transform(value)
return value
}
public static func validate(_ value: To) throws -> To {
let _ = try transform(value)
return value
}
}