private bool IsEmptyString(PropertyValidatorContext context)
{
if (context.PropertyValue is string)
return string.IsNullOrWhiteSpace(context.PropertyValue as string);
return false;
}
/// <summary>
/// Returns all the validation errors for the specified context
/// </summary>
/// <param name="context">The context to validate</param>
/// <returns>Lit of all validation errors</returns>
public IEnumerable<ValidationError> Validate(
PropertyValidatorContext context)
{
if (!IsValid(context))
return new[] { CreateValidationError(context) };
return Enumerable.Empty<ValidationError>();
}
/// <summary>
/// Returns whether or not the property value is valid comparing somehow
/// with valueToCompare
/// </summary>
/// <param name="context">The context</param>
/// <returns>True if property value is valid; false, otherwise</returns>
protected override bool IsValid(PropertyValidatorContext context)
{
// If we're working with a nullable type then this rule should not be applied.
if (context.PropertyValue.IsNull())
return true;
return IsValid((IComparable)context.PropertyValue, ValueToCompare);
}
/// <summary>
/// Returns whether or not the property value is not empty
/// </summary>
/// <param name="context">The context</param>
/// <returns>True when property value is not empty; false, otherwise</returns>
protected override bool IsValid(PropertyValidatorContext context)
{
if (context.PropertyValue.IsNull() ||
IsEmptyString(context) ||
IsEmptyCollection(context))
return false;
return true;
}
/// <summary>
/// Returns whether or not the property value length is between
/// minimumLength and maximumLength
/// </summary>
/// <param name="context">The context</param>
/// <returns>
/// True when property value length is between minimum length and maximum length;
/// false, otherwise</returns>
protected override bool IsValid(PropertyValidatorContext context)
{
if (context.PropertyValue.IsNull() || !(context.PropertyValue is string))
return true;
var length = context.PropertyValue.ToString().Length;
return length >= MinimunLength &&
(MaximumLength == -1 || length <= MaximumLength);
}
/// <summary>
/// Returns whether or not the property vaue is equal to valueToCompare
/// </summary>
/// <param name="context">The context</param>
/// <returns>True if property value is equal to valueToCompare; false, otherwise</returns>
protected override bool IsValid(PropertyValidatorContext context)
{
return Compare(context.PropertyValue, ValueToCompare);
}
/// <summary>
/// Returns an instance of ValidationError
/// </summary>
/// <param name="context">The context</param>
/// <returns>An instance of ValidationError</returns>
protected virtual ValidationError CreateValidationError(
PropertyValidatorContext context)
{
return new ValidationError(context.PropertyName, context.PropertyValue, ErrorMessage);
}
/// <summary> /// Returns whether or not the property validator context is valid /// </summary> /// <param name="context">The context</param> /// <returns>True if context is valid; false, otherwise</returns> protected abstract bool IsValid(PropertyValidatorContext context);
private bool IsEmptyCollection(PropertyValidatorContext context)
{
var collection = context.PropertyValue as IEnumerable;
return collection != null && !collection.Cast<object>().Any();
}
/// <summary>
/// Returns whether or not the property value mathes the regular expression
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
protected override bool IsValid(PropertyValidatorContext context)
{
return context.PropertyValue.IsNull() ||
(context.PropertyValue is string && _regex.IsMatch(context.PropertyValue.ToString()));
}
/// <summary>
/// Returns whether or not the property is valid based on nullability condition
/// </summary>
/// <param name="context">The property context</param>
/// <returns></returns>
protected override bool IsValid(PropertyValidatorContext context)
{
return context.PropertyValue != null;
}