James Thigpen

/// <summary>
/// Validate that the property's value is unique in the database when saved.
/// 
/// Also supports being disabled (primarily for testing purposes).
/// </summary>
[Serializable, CLSCompliant(false)]
public class ValidateIsUniqueSometimesAttribute : AbstractValidationAttribute
{
    private static bool enabled = true;

    /// <summary>
    /// When set to true (the default value), the Validator will run as expected.
    /// Otherwise the validator is disabled.
    /// 
    /// 
    /// </summary>
    public static bool Enabled
    {
        get { return enabled; }
        set { enabled = value; }
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="ValidateIsUniqueSometimesAttribute"/> class.
    /// </summary>
    public ValidateIsUniqueSometimesAttribute() : base()
    {
    }

    /// <summary>
    /// Initializes a new instance of the <see cref="ValidateIsUniqueSometimesAttribute"/> class.
    /// </summary>
    /// <param name="errorMessage">The error message.</param>
    public ValidateIsUniqueSometimesAttribute(String errorMessage)
        : base(errorMessage)
    {
    }

    private IValidator GetCorrectValidator()
    {
        if (Enabled)
        {
            return new IsUniqueValidator();
        }

        return new AlwaysReturnsNoErrorsValidator();
    }

    /// <summary>
    /// Constructs and configures an <see cref="IValidator"/>
    /// instance based on the properties set on the attribute instance.
    /// </summary>
    /// <returns></returns>
    public override IValidator Build()
    {
        var validator = GetCorrectValidator();

        ConfigureValidatorMessage(validator);

        return validator;
    }
}