BigTable Email - Vaadin converter

gistfile1.java

package com.appspot.natanedwin.app;

import com.google.appengine.api.datastore.Email;
import com.vaadin.data.util.converter.Converter;
import com.vaadin.data.util.converter.DefaultConverterFactory;
import java.util.Locale;

/**
 * @author Bartłomiej Prokop
 */
public class BigTableConverterFactory extends DefaultConverterFactory {

    @Override
    protected <PRESENTATION, MODEL> Converter<PRESENTATION, MODEL> findConverter(Class<PRESENTATION> presentationType, Class<MODEL> modelType) {
        if (presentationType == String.class && modelType == Email.class) {
            return (Converter<PRESENTATION, MODEL>) new StringToEmail();
        }
        return super.findConverter(presentationType, modelType);
    }

    public static class StringToEmail implements Converter<String, Email> {

        @Override
        public Email convertToModel(String value, Locale locale) throws ConversionException {
            return value == null ? null : new Email(value);
        }

        @Override
        public String convertToPresentation(Email value, Locale locale) throws ConversionException {
            return value == null ? null : value.getEmail();
        }

        @Override
        public Class<Email> getModelType() {
            return Email.class;
        }

        @Override
        public Class<String> getPresentationType() {
            return String.class;
        }
    }
}