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package javafx.util.converter;

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;
import javafx.util.StringConverter;

StringConverter implementation for Number values.

Since:JavaFX 2.1
/** * <p>{@link StringConverter} implementation for {@link Number} values.</p> * @since JavaFX 2.1 */
public class NumberStringConverter extends StringConverter<Number> { // ------------------------------------------------------ Private properties final Locale locale; final String pattern; final NumberFormat numberFormat; // ------------------------------------------------------------ Constructors public NumberStringConverter() { this(Locale.getDefault()); } public NumberStringConverter(Locale locale) { this(locale, null); } public NumberStringConverter(String pattern) { this(Locale.getDefault(), pattern); } public NumberStringConverter(Locale locale, String pattern) { this(locale, pattern, null); } public NumberStringConverter(NumberFormat numberFormat) { this(null, null, numberFormat); } NumberStringConverter(Locale locale, String pattern, NumberFormat numberFormat) { this.locale = locale; this.pattern = pattern; this.numberFormat = numberFormat; } // ------------------------------------------------------- Converter Methods
{@inheritDoc}
/** {@inheritDoc} */
@Override public Number fromString(String value) { try { // If the specified value is null or zero-length, return null if (value == null) { return null; } value = value.trim(); if (value.length() < 1) { return null; } // Create and configure the parser to be used NumberFormat parser = getNumberFormat(); // Perform the requested parsing return parser.parse(value); } catch (ParseException ex) { throw new RuntimeException(ex); } }
{@inheritDoc}
/** {@inheritDoc} */
@Override public String toString(Number value) { // If the specified value is null, return a zero-length String if (value == null) { return ""; } // Create and configure the formatter to be used NumberFormat formatter = getNumberFormat(); // Perform the requested formatting return formatter.format(value); }

Return a NumberFormat instance to use for formatting and parsing in this StringConverter.

Returns:a NumberFormat instance for formatting and parsing in this StringConverter
/** * <p>Return a <code>NumberFormat</code> instance to use for formatting * and parsing in this {@link StringConverter}.</p> * * @return a {@code NumberFormat} instance for formatting and parsing in this * {@link StringConverter} */
protected NumberFormat getNumberFormat() { Locale _locale = locale == null ? Locale.getDefault() : locale; if (numberFormat != null) { return numberFormat; } else if (pattern != null) { DecimalFormatSymbols symbols = new DecimalFormatSymbols(_locale); return new DecimalFormat(pattern, symbols); } else { return NumberFormat.getNumberInstance(_locale); } } }