1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
package cask.router
/**
* Represents what comes out of an attempt to invoke an [[EntryPoint]].
* Could succeed with a value, but could fail in many different ways.
*/
sealed trait Result[+T]{
def map[V](f: T => V): Result[V]
def transform[V](f: PartialFunction[T, V]): Result[V]
}
object Result{
/**
* Invoking the [[EntryPoint]] was totally successful, and returned a
* result
*/
case class Success[T](value: T) extends Result[T]{
def map[V](f: T => V) = Success(f(value))
def transform[V](f: PartialFunction[T, V]) = f.lift(value) match {
case None => Success(value).asInstanceOf[Result[V]]
case Some(res) => Success(res)
}
}
/**
* Invoking the [[EntryPoint]] was not successful
*/
sealed trait Error extends Result[Nothing]{
def map[V](f: Nothing => V) = this
def transform[V](f: PartialFunction[Nothing, V]) = this
}
object Error{
/**
* Invoking the [[EntryPoint]] failed with an exception while executing
* code within it.
*/
case class Exception(t: Throwable) extends Error
/**
* Invoking the [[EntryPoint]] failed because the arguments provided
* did not line up with the arguments expected
*/
case class MismatchedArguments(missing: Seq[ArgSig[_, _, _, _]],
unknown: Seq[String]) extends Error
/**
* Invoking the [[EntryPoint]] failed because there were problems
* deserializing/parsing individual arguments
*/
case class InvalidArguments(values: Seq[ParamError]) extends Error
}
sealed trait ParamError
object ParamError{
/**
* Something went wrong trying to de-serialize the input parameter;
* the thrown exception is stored in [[ex]]
*/
case class Invalid(arg: ArgSig[_, _, _, _], value: String, ex: Throwable) extends ParamError
/**
* Something went wrong trying to evaluate the default value
* for this input parameter
*/
case class DefaultFailed(arg: ArgSig[_, _, _, _], ex: Throwable) extends ParamError
}
}
|
