Adding UUID Converter

[Oliver B. Fischer]

I have to validate a lot of UUIDs and wrote a small converter for UUID. 
If the quite simple implementation is fine for you I would like to 
contribute it to the Wicket code base including some tests

public class UUIDConverter implements IConverter<UUID>
{
    public static final String UUID_REGEX = 
"[0-9a-fA-F]{8}(?:-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}";

    @Override
    public UUID convertToObject(String value, Locale locale)
        throws ConversionException
    {
        UUID conversionResult = null;

        if (value == null || !value.matches(UUID_REGEX)) {
            throw newConversionException(value);
        }

        try {
            conversionResult = UUID.fromString(value);
        }
        catch (IllegalArgumentException e)
        {
            throw newConversionException(value);
        }

        return conversionResult;
    }

    @Override
    public String convertToString(UUID value, Locale locale)
    {
        String conversionResult = null;

        if (value != null) {
            conversionResult = value.toString();
        }

        return conversionResult;
    }

    protected ConversionException newConversionException(String value)
    {
        return new ConversionException("Failed to convert " + value +
                                       "to a UUID");
    }
}


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