Spec-Zone .ru
спецификации, руководства, описания, API
001/*
002 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
003 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004 *
005 * This code is free software; you can redistribute it and/or modify it
006 * under the terms of the GNU General Public License version 2 only, as
007 * published by the Free Software Foundation.  Oracle designates this
008 * particular file as subject to the "Classpath" exception as provided
009 * by Oracle in the LICENSE file that accompanied this code.
010 *
011 * This code is distributed in the hope that it will be useful, but WITHOUT
012 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014 * version 2 for more details (a copy is included in the LICENSE file that
015 * accompanied this code).
016 *
017 * You should have received a copy of the GNU General Public License version
018 * 2 along with this work; if not, write to the Free Software Foundation,
019 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020 *
021 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
022 * or visit www.oracle.com if you need additional information or have any
023 * questions.
024 */
025
026package javafx.util.converter;
027
028import java.text.DecimalFormat;
029import java.text.DecimalFormatSymbols;
030import java.text.NumberFormat;
031import java.text.ParseException;
032import java.util.Locale;
033import javafx.util.StringConverter;
034
035/**
036 * <p>{@link StringConverter} implementation for {@link Number} values.</p>
037 */
038public class NumberStringConverter extends StringConverter<Number> {
039    
040    // ------------------------------------------------------ Private properties
041
042    final Locale locale;
043    final String pattern;
044    final NumberFormat numberFormat;
045    
046    // ------------------------------------------------------------ Constructors
047    public NumberStringConverter() {
048        this(Locale.getDefault());
049    }
050    
051    public NumberStringConverter(Locale locale) {
052        this(locale, null);
053    }
054    
055    public NumberStringConverter(String pattern) {
056        this(Locale.getDefault(), pattern);
057    }
058    
059    public NumberStringConverter(Locale locale, String pattern) {
060        this(locale, pattern, null);
061    }
062    
063    public NumberStringConverter(NumberFormat numberFormat) {
064        this(null, null, numberFormat);
065    }
066    
067    NumberStringConverter(Locale locale, String pattern, NumberFormat numberFormat) {
068        this.locale = locale;
069        this.pattern = pattern;
070        this.numberFormat = numberFormat;
071    }
072
073    // ------------------------------------------------------- Converter Methods
074
075    /** {@inheritDoc} */
076    @Override public Number fromString(String value) {
077        try {
078            // If the specified value is null or zero-length, return null
079            if (value == null) {
080                return null;
081            }
082
083            value = value.trim();
084
085            if (value.length() < 1) {
086                return null;
087            }
088
089            // Create and configure the parser to be used
090            NumberFormat parser = getNumberFormat();
091
092            // Perform the requested parsing
093            return parser.parse(value);
094        } catch (ParseException ex) {
095            throw new RuntimeException(ex);
096        }
097    }
098
099    /** {@inheritDoc} */
100    @Override public String toString(Number value) {
101        // If the specified value is null, return a zero-length String
102        if (value == null) {
103            return "";
104        }
105
106        // Create and configure the formatter to be used
107        NumberFormat formatter = getNumberFormat();
108
109        // Perform the requested formatting
110        return formatter.format(value);
111    }
112
113    /**
114     * <p>Return a <code>NumberFormat</code> instance to use for formatting
115     * and parsing in this {@link StringConverter}.</p>
116     */
117    protected NumberFormat getNumberFormat() {
118        Locale _locale = locale == null ? Locale.getDefault() : locale;
119        
120        if (numberFormat != null) {
121            return numberFormat;
122        } else if (pattern != null) {
123            DecimalFormatSymbols symbols = new DecimalFormatSymbols(_locale);
124            return new DecimalFormat(pattern, symbols);
125        } else {
126            return NumberFormat.getNumberInstance(_locale);
127        }
128    }
129}