/// <summary>
/// Returns an enumeration of random strings from a pre-existing stock of values.
/// </summary>
/// <param name="count">The number of strings to generate.</param>
/// <param name="stock">A stock of preset values.</param>
/// <returns>An enumeration of random string values.</returns>
/// <exception cref="GenerationException">Thrown if the specified parameters are inconsistent or invalid.</exception>
public static IEnumerable <string> Strings(int count, RandomStringStock stock)
{
var generator = new RandomStockStringGenerator
{
Count = count,
Values = RandomStringStockInfo.FromStock(stock).GetItems(),
};
foreach (string value in generator.Run())
{
yield return(value);
}
}
private RandomStringGenerator GetGeneratorImpl(IPatternScope scope)
{
if (generator == null)
{
var invoker = MakeFilterInvoker(scope);
if (Pattern == null && stock == null)
{
throw new PatternUsageErrorException("You must specify how to generate random strings by setting either 'Pattern' or 'Stock' appropriately.");
}
if (!String.IsNullOrEmpty(Pattern) && stock.HasValue)
{
throw new PatternUsageErrorException("You must specify how to generate random strings by setting either 'Pattern' or 'Stock' exclusively.");
}
try
{
if (stock.HasValue)
{
return(generator = new RandomStockStringGenerator
{
Values = RandomStringStockInfo.FromStock(stock.Value).GetItems(),
Count = count,
Filter = invoker,
Seed = NullableSeed,
});
}
return(generator = new RandomRegexLiteStringGenerator
{
RegularExpressionPattern = Pattern,
Count = count,
Filter = invoker,
Seed = NullableSeed,
});
}
catch (GenerationException exception)
{
throw new PatternUsageErrorException(String.Format("The random strings generator was incorrectly initialized ({0}).", exception.Message), exception);
}
}
return(generator);
}
