/// <summary>
/// Checks if view complies with it's contract
/// </summary>
/// <param name="view">Object to check</param>
/// <returns>Simply ok or verbose contract errors description (for reading, not serializing)</returns>
/// <exception cref="InvalidOperationException">
/// Will be thrown if <see cref="view"/> does not have <see cref="ApiViewAttribute"/> attribute
/// </exception>
public static ViewCheckResult CheckContract(object view)
{
if (view == null)
{
return(ViewCheckResult.Ok());
}
if (!view.IsApiView())
{
throw new InvalidOperationException("No classes except API views can have contracts");
}
try
{
var properties = view.GetType().GetRuntimeProperties();
var checkResults = new List <ApiErrorView>();
var innerCheckResults = new List <ApiErrorView>();
checkResults.AddRange(PerformSpecificChecks(view));
foreach (var propertyInfo in properties)
{
var propertyValue = propertyInfo.GetValue(view);
if (propertyValue != null)
{
if (propertyValue.IsApiView())
{
var checkResult = CheckContract(propertyValue);
if (!checkResult.IsCorrect)
{
innerCheckResults.Add(checkResult.ApiErrorView);
}
}
if (propertyValue.IsApiViewList())
{
var list = propertyValue as IList;
if (list == null)
{
continue;
}
innerCheckResults.AddRange(from object item in list
select CheckContract(item)
into checkResult
where !checkResult.IsCorrect
select checkResult.ApiErrorView);
}
}
var contractAttributes = propertyInfo.GetCustomAttributes <ApiContractAttribute>().ToList();
if (!contractAttributes.Any())
{
continue;
}
if (contractAttributes.Count != 1)
{
return(ViewCheckResult.Error(ApiErrorViewFactory.Unspecified()));
}
var contractAttribute = contractAttributes[0];
var contractType = contractAttribute.Type;
var failedChecks = CheckerDictionary
.Where(kv => contractType.HasFlag(kv.Key) && !kv.Value.Invoke(propertyValue))
.Select(kv => kv.Key)
.ToList();
if (failedChecks.Any())
{
var propertyName = propertyInfo.Name;
checkResults.AddRange(
failedChecks.Select(fc => ApiErrorViewFactory.ViewPropertyContractViolation(view, propertyName, fc)));
}
}
return(BuildCheckResult(view, checkResults, innerCheckResults));
}
catch (Exception ex)
{
return(ViewCheckResult.Error(ApiErrorViewFactory.Unspecified($"Failed to check view: {ex.Message}")));
}
}
