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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 Double} and back.
* Uses the given locale and a {@link NumberFormat} instance for formatting and
* parsing.
* <p>
* Leading and trailing white spaces are ignored when converting from a String.
* </p>
* <p>
* Override and overwrite {@link #getFormat(Locale)} to use a different format.
* </p>
*
* @author Vaadin Ltd
* @version
* @VERSION@
* @since 7.0
*/
public class StringToDoubleConverter implements Converter<String, Double> {
/**
* Returns the format used by {@link #convertToPresentation(Double, 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.getNumberInstance(locale);
}
/*
* (non-Javadoc)
*
* @see
* com.vaadin.data.util.converter.Converter#convertToModel(java.lang.Object,
* java.util.Locale)
*/
@Override
public Double convertToModel(String value, Locale locale)
throws ConversionException {
if (value == null) {
return null;
}
// Remove leading and trailing white space
value = value.trim();
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());
}
return parsedValue.doubleValue();
}
/*
* (non-Javadoc)
*
* @see
* com.vaadin.data.util.converter.Converter#convertToPresentation(java.lang
* .Object, java.util.Locale)
*/
@Override
public String convertToPresentation(Double value, Locale locale)
throws ConversionException {
if (value == null) {
return null;
}
return getFormat(locale).format(value);
}
/*
* (non-Javadoc)
*
* @see com.vaadin.data.util.converter.Converter#getModelType()
*/
@Override
public Class<Double> getModelType() {
return Double.class;
}
/*
* (non-Javadoc)
*
* @see com.vaadin.data.util.converter.Converter#getPresentationType()
*/
@Override
public Class<String> getPresentationType() {
return String.class;
}
}
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