/// <summary>
/// Allocates a new validation state with the specified error added to existing state
/// </summary>
/// <param name="existing">Existing context state that the new state will be based on</param>
/// <param name="error">An error to return</param>
public ValidState(ValidState existing, Exception error)
{
if (!existing.IsAssigned)
{
throw new CallGuardException(nameof(ValidState) + ".ctor", nameof(existing), "Unassigned");
}
TargetName = existing.TargetName;
Mode = existing.Mode;
Error = ValidationBatchException.Concatenate(existing.Error, error);
ErrorLimit = existing.ErrorLimit;
}
/// <summary>
/// Links two errors together into ValidationBatchException, creating a new instance if necessary.
/// Both parameters can be null. A new instance is create only if existing exception is not null
/// and is not of ValidationBatchException type, otherwise new exception is added to an existing batch instance.
/// The method may return null if both exceptions are null.
/// </summary>
public static Exception Concatenate(Exception existingException, Exception newException)
{
if (existingException == null)
{
return(newException);
}
if (newException == null)
{
return(existingException);
}
var result = existingException as ValidationBatchException;
if (result == null)
{
result = new ValidationBatchException(existingException);
}
result.Batch.Add(newException);
return(result);
}