/// <summary>
/// Checks whether the given value is not null and not an <see cref="String.Empty"/> string.
/// An exception is thrown otherwise.
/// </summary>
/// <param name="validator">The <see cref="ConditionValidator{T}"/> that holds the value that has to be checked.</param>
/// <returns>The specified <paramref name="validator"/> instance.</returns>
/// <exception cref="ArgumentException">Thrown when the <see cref="ConditionValidator{T}.Value">Value</see> of the specified <paramref name="validator"/> is <see cref="String.Empty"/>, while the specified <paramref name="validator"/> is created using the <see cref="Condition.Requires{T}(T,string)">Requires</see> extension method.</exception>
/// <exception cref="ArgumentNullException">Thrown when the <see cref="ConditionValidator{T}.Value">Value</see> of the specified <paramref name="validator"/> is null or empty, while the specified <paramref name="validator"/> is created using the <see cref="Condition.Requires{T}(T,string)">Requires</see> extension method.</exception>
/// <exception cref="PostconditionException">Thrown when the <see cref="ConditionValidator{T}.Value">Value</see> of the specified <paramref name="validator"/> is null or empty, while the specified <paramref name="validator"/> is created using the <see cref="Condition.Ensures{T}(T,string)">Ensures</see> extension method.</exception>
public static ConditionValidator <string> IsNotNullOrEmpty(this ConditionValidator <string> validator)
{
bool valueIsInvalid = String.IsNullOrEmpty(validator.Value);
if (valueIsInvalid)
{
Throw.ValueShouldNotBeNullOrAnEmptyString(validator, null);
}
return(validator);
}
private static string GetFormattedConditionMessage <T>(
ConditionValidator <T> validator,
string resourceKey,
string conditionDescription, params object[] resourceFormatArguments)
{
if (conditionDescription != null)
{
return(FormatConditionDescription(validator, conditionDescription));
}
else
{
return(SR.GetString(resourceKey, resourceFormatArguments));
}
}
private static string FormatConditionDescription <T>(ConditionValidator <T> validator,
string conditionDescription)
{
try
{
return(String.Format(CultureInfo.CurrentCulture, conditionDescription ?? String.Empty,
validator.ArgumentName));
}
catch (FormatException)
{
// We catch a FormatException. This code should only throw exceptions generated by the
// validator.BuildException method. Throwing another exception would confuse the user and
// would make debugging harder. When the user supplied an unformattable description, we simply
// use the unformatted description as condition.
return(conditionDescription);
}
}
