Translator for BigDecimal values
--------------------------------
Key: TAPESTRY-817
URL: http://issues.apache.org/jira/browse/TAPESTRY-817
Project: Tapestry
Type: New Feature
Versions: 4.0
Reporter: Vjeran Marcinko
Tapestry currently lacks Translator for BigDecimal values. NumberTranslator is
no good since it uses DecimalFormat underneath which converts String value into
Double object, which then cannot accurately be converted to BigDecimal by it's
very nature.
Solution is to introduce new BigDecimalTranslator, something like :
import org.apache.hivemind.ApplicationRuntimeException;
import org.apache.tapestry.form.IFormComponent;
import org.apache.tapestry.form.ValidationMessages;
import org.apache.tapestry.form.translator.AbstractTranslator;
import org.apache.tapestry.valid.ValidationConstraint;
import org.apache.tapestry.valid.ValidationStrings;
import org.apache.tapestry.valid.ValidatorException;
import java.math.BigDecimal;
import java.util.Locale;
public class BigDecimalTranslator extends AbstractTranslator {
public BigDecimalTranslator() {
}
// Needed until HIVEMIND-134 fix is available
public BigDecimalTranslator(String initializer) {
super(initializer);
}
protected String formatObject(IFormComponent field, Locale locale, Object
object) {
if (!(object instanceof BigDecimal)) {
throw new ApplicationRuntimeException("BigDecimalTranslator
translates values of type BigDecimal, not: " + object.getClass());
}
return object.toString();
}
protected Object parseText(IFormComponent field, ValidationMessages
messages, String text) throws ValidatorException {
try {
return new BigDecimal(text);
} catch (NumberFormatException e) {
throw new ValidatorException(buildMessage(messages, field,
ValidationStrings.INVALID_NUMBER), ValidationConstraint.NUMBER_FORMAT);
}
}
}
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