/// <summary> Create a relation between two members on two different objects. </summary>
public static void Assign(ITestStepParent inputObject, IMemberData inputMember, ITestStepParent outputObject, IMemberData outputMember)
{
if (outputMember == null)
{
throw new ArgumentNullException(nameof(outputMember));
}
if (inputMember == null)
{
throw new ArgumentNullException(nameof(inputMember));
}
if (inputObject == null)
{
throw new ArgumentNullException(nameof(inputObject));
}
if (outputObject == null)
{
throw new ArgumentNullException(nameof(outputObject));
}
if (inputMember == outputMember && inputObject == outputObject)
{
throw new ArgumentException("An input/output may not be assigned to itself.");
}
if (outputMember.Readable == false)
{
throw new ArgumentException(nameof(outputMember) + " is not readable!", nameof(outputMember));
}
if (inputMember.Writable == false)
{
throw new ArgumentException(nameof(inputMember) + " is not writeable!", nameof(inputMember));
}
var connTo = getOutputRelations(inputObject).ToList();
var connFrom = getInputRelations(outputObject).ToList();
foreach (var connection in connTo)
{
if (connection.OutputObject == outputObject && connection.OutputMember == outputMember && inputMember == connection.InputMember)
{
throw new ArgumentException("Input already assigned", nameof(inputMember));
}
}
if (IsInput(inputObject, inputMember))
{
throw new Exception("This input is already in use by another connection.");
}
// these two restrictions might not be necessary, but it might be good to leave it
// in case we want to change the mechanism
if (IsInput(outputObject, outputMember))
{
throw new Exception("An output cannot also be an input");
}
if (IsOutput(inputObject, inputMember))
{
throw new Exception("An input cannot also be an output");
}
var newSpec = new InputOutputRelation(inputObject, inputMember, outputObject, outputMember);
connTo.Add(newSpec);
connFrom.Add(newSpec);
SetOutputRelations(inputObject, connTo.ToArray());
SetInputRelations(outputObject, connFrom.ToArray());
}
/// <summary> Unassign an input/output relation. </summary>
/// <param name="relation"></param>
internal static void Unassign(InputOutputRelation relation)
{
SetOutputRelations(relation.InputObject, getOutputRelations(relation.InputObject).Where(x => x != relation).ToArray());
SetInputRelations(relation.OutputObject, getInputRelations(relation.OutputObject).Where(x => x != relation).ToArray());
}
