public Result <ItSystemUsage.ItSystemUsage, OperationError> RemoveSystem(ItSystemUsage.ItSystemUsage systemUsage)
{
if (systemUsage == null)
{
throw new ArgumentNullException(nameof(systemUsage));
}
if (GetAssignedSystemUsage(systemUsage.Id).IsNone)
{
return(new OperationError("Usage not assigned", OperationFailure.BadInput));
}
SystemUsages.Remove(systemUsage);
return(systemUsage);
}
public Result <ItSystemUsage.ItSystemUsage, OperationError> AssignSystem(ItSystemUsage.ItSystemUsage systemUsage)
{
if (systemUsage == null)
{
throw new ArgumentNullException(nameof(systemUsage));
}
if (GetAssignedSystemUsage(systemUsage.Id).HasValue)
{
return(new OperationError("System usage is already assigned", OperationFailure.Conflict));
}
SystemUsages.Add(systemUsage);
return(systemUsage);
}
private Maybe <ItSystemUsage.ItSystemUsage> GetAssignedSystemUsage(int usageId)
{
return(SystemUsages.FirstOrDefault(x => x.Id == usageId).FromNullable());
}
