Исходный код

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.*;
029import javafx.util.StringConverter;
030
031/**
032 * <p>{@link StringConverter} implementation that can use a {@link Format} 
033 * instance.</p>
034 *
035 * @since 2.2
036 */
037public class FormatStringConverter<T> extends StringConverter<T> {
038    
039    // ------------------------------------------------------ Private properties
040
041    final Format format;
042    
043    // ------------------------------------------------------------ Constructors
044    
045    public FormatStringConverter(Format format) {
046        this.format = format;
047    }
048
049    // ------------------------------------------------------- Converter Methods
050
051    /** {@inheritDoc} */
052    @Override public T fromString(String value) {
053        try {
054            // If the specified value is null or zero-length, return null
055            if (value == null) {
056                return null;
057            }
058
059            value = value.trim();
060
061            if (value.length() < 1) {
062                return null;
063            }
064
065            // Create and configure the parser to be used
066            Format _format = getFormat();
067
068            // Perform the requested parsing, and attempt to conver the output
069            // back to T
070            return (T) _format.parseObject(value);
071        } catch (ParseException ex) {
072            throw new RuntimeException(ex);
073        }
074    }
075
076    /** {@inheritDoc} */
077    @Override public String toString(T value) {
078        // If the specified value is null, return a zero-length String
079        if (value == null) {
080            return "";
081        }
082
083        // Create and configure the formatter to be used
084        Format _format = getFormat();
085
086        // Perform the requested formatting
087        return _format.format(value);
088    }
089
090    /**
091     * <p>Return a <code>Format</code> instance to use for formatting
092     * and parsing in this {@link StringConverter}.</p>
093     */
094    protected Format getFormat() {
095        return format;
096    }
097}