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/*
@VaadinApache2LicenseForJavaFiles@
*/
package com.vaadin.data.util.converter;
import java.text.NumberFormat;
import java.text.ParsePosition;
import java.util.Locale;
/**
* A converter that converts from {@link String} to {@link Integer} and back.
* Uses the given locale and a {@link NumberFormat} instance for formatting and
* parsing.
* <p>
* Override and overwrite {@link #getFormat(Locale)} to use a different format.
* </p>
*
* @author Vaadin Ltd
* @version
* @VERSION@
* @since 7.0
*/
public class StringToIntegerConverter implements Converter<String, Integer> {
/**
* Returns the format used by
* {@link #convertToPresentation(Integer, Locale)} and
* {@link #convertToModel(String, Locale)}.
*
* @param locale
* The locale to use
* @return A NumberFormat instance
*/
protected NumberFormat getFormat(Locale locale) {
if (locale == null) {
locale = Locale.getDefault();
}
return NumberFormat.getIntegerInstance(locale);
}
@Override
public Integer convertToModel(String value, Locale locale)
throws ConversionException {
if (value == null) {
return null;
}
// Remove leading and trailing white space
value = value.trim();
// Parse and detect errors. If the full string was not used, it is
// an error.
ParsePosition parsePosition = new ParsePosition(0);
Number parsedValue = getFormat(locale).parse(value, parsePosition);
if (parsePosition.getIndex() != value.length()) {
throw new ConversionException("Could not convert '" + value
+ "' to " + getModelType().getName());
}
if (parsedValue == null) {
// Convert "" to null
return null;
}
return parsedValue.intValue();
}
@Override
public String convertToPresentation(Integer value, Locale locale)
throws ConversionException {
if (value == null) {
return null;
}
return getFormat(locale).format(value);
}
@Override
public Class<Integer> getModelType() {
return Integer.class;
}
@Override
public Class<String> getPresentationType() {
return String.class;
}
}
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