My application stores money amounts as an integer number of cents. I've
written a converter to handle this as follows:
public class MoneyConverter extends SimpleConverterAdapter {
public Object toObject(String value) {
try {
return Math.round(Float.parseFloat(value) * 100);
} catch (NumberFormatException e) {
throw new ConversionException("").setSourceValue(value);
}
}
public String toString(Object value) {
float amount = ((Number) value).floatValue() / 100;
return String.format("%.2f", amount);
}
}
When attached to a TextField, this converter is called twice, once
before calling the field validators, and again when saving to the model.
This second call is failing in this part of SimpleConverterAdapter:
else if (value != null && (!value.getClass().isAssignableFrom(c)))
{
throw new IllegalArgumentException("unable to convert " +
value + " to type " + c);
}
...because value.getClass() is "Integer" while c is "int", and the two
are not assignable from one another (apparently, Java 5 autoboxing does
not apply here). The error message is an unhelpful "unable to convert 1
to type int".
So it seems that SimpleAdapterConverter cannot be used with
primitive-typed properties. Does this sound right? Will this limitation
exist in 1.3 (I'm using 1.2.6)? Can anyone think of a workaround other
that implementing IConverter directly and checking explicitly for
Integer -> int?
jk
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