Thiago, I'd like to donate the following code to the community or anybody
else who may run into this problem. It would be nice if it was a part of
tapestry's core validation library enabling us to validate currency/amounts.
I didn't include the js only because we aren't using it at my organization.
maximum-precision=You may provide at most %d numbers for %s.
maximum-scale=You may provide at most %d decimal digits for %s.
//MaxScale
public class MaxScale extends AbstractValidator<Integer, BigDecimal> {
public MaxScale() {
super(Integer.class, BigDecimal.class, "maximum-scale");
}
@Override
public void validate(Field field, Integer constraintValue,
MessageFormatter formatter, BigDecimal value)
throws ValidationException
{
if (value.scale() > constraintValue)
throw new ValidationException(buildMessage(formatter, field,
constraintValue));
}
private String buildMessage(MessageFormatter formatter, Field field,
Integer constraintValue) {
return formatter.format(constraintValue, field.getLabel());
}
@Override
public void render(Field field, Integer constraintValue,
MessageFormatter formatter, MarkupWriter writer,
FormSupport formSupport) {
formSupport.addValidation(field, "maxscale", buildMessage(formatter,
field, constraintValue), constraintValue);
}
}
//MaxPrecision
public class MaxPrecision extends AbstractValidator<Integer, BigDecimal> {
public MaxPrecision() {
super(Integer.class, BigDecimal.class, "maximum-precision");
}
@Override
public void validate(Field field, Integer constraintValue,
MessageFormatter formatter, BigDecimal value)
throws ValidationException
{
if (value.precision() > constraintValue)
throw new ValidationException(buildMessage(formatter, field,
constraintValue));
}
private String buildMessage(MessageFormatter formatter, Field field,
Integer constraintValue) {
return formatter.format(constraintValue, field.getLabel());
}
@Override
public void render(Field field, Integer constraintValue,
MessageFormatter formatter, MarkupWriter writer,
FormSupport formSupport) {
formSupport.addValidation(field, "maxprecision",
buildMessage(formatter, field, constraintValue), constraintValue);
}
}
//AppModule
@SuppressWarnings("rawtypes")
public static void
contributeFieldValidatorSource(MappedConfiguration<String, Validator>
configuration) {
configuration.add("maxScale", new MaxScale());
configuration.add("maxPrecision", new MaxPrecision());
}
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