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JideFX Common Layer is a collection of several extend feature for JavaFX
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/*
 * @(#)LocalDateConverter.java 5/19/2013
 *
 * Copyright 2002 - 2013 JIDE Software Inc. All rights reserved.
 */

package jidefx.utils.converter.time;

import jidefx.utils.converter.ConverterContext;
import jidefx.utils.converter.DefaultObjectConverter;

import java.time.format.DateTimeFormatter;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAccessor;

/**
 * Abstract implementations of {@link jidefx.utils.converter.ObjectConverter} for all the data types that extends {@link
 * TemporalAccessor}.
 */
abstract public class TemporalAccessConverter extends DefaultObjectConverter {
    /**
     * A property for the converter context. You can set a {@link java.time.format.DateTimeFormatter} to it and the
     * converter will use it to do the conversion.
     */
    public static final String PROPERTY_DATE_TIME_FORMATTER = "DateTimeFormatter"; //NON-NLS

    private DateTimeFormatter _defaultFormatter = null;

    /**
     * Creates a TemporalConverter.
     */
    public TemporalAccessConverter() {
    }

    /**
     * Converts the LocalDate to String.
     *
     * @param value   the LocalDate to be converted
     * @param context the converter context.
     * @return the string
     */
    @Override
    synchronized public String toString(T value, ConverterContext context) {
        if (value == null) {
            return "";
        }
        else {
            Object formatter = context != null ? context.getProperties().get(PROPERTY_DATE_TIME_FORMATTER) : null;
            if (formatter instanceof DateTimeFormatter) {
                return ((DateTimeFormatter) formatter).format(value);
            }
            else {
                return getDefaultDateTimeFormatter().format(value);
            }
        }
    }

    /**
     * Converts from a String to a TemporalAccess.
     *
     * @param string  the string to be converted.
     * @param context the converter context.
     * @return the TemporalAccess. If the string is null or empty, null will be returned. If the string cannot be parsed
     *         as a date, null will be returned.
     */
    synchronized public TemporalAccessor temporalFromString(String string, ConverterContext context) {
        if (string == null) {
            return null;
        }

        string = string.trim();
        if (string.length() == 0) {
            return null;
        }

        try {
            Object formatter = context != null ? context.getProperties().get(PROPERTY_DATE_TIME_FORMATTER) : null;
            if (formatter instanceof DateTimeFormatter) {
                return ((DateTimeFormatter) formatter).parse(string);
            }
            else {
                return getDefaultDateTimeFormatter().parse(string);
            }
        }
        catch (Exception e1) { // if current formatter doesn't work try those default ones.

            try {
                return getShortDateTimeFormatter().parse(string);
            }
            catch (Exception e2) {
                try {
                    return getMediumDateTimeFormatter().parse(string);
                }
                catch (Exception e3) {
                    try {
                        return getLongDateTimeFormatter().parse(string);
                    }
                    catch (Exception e4) {
                        try {
                            return getFullDateTimeFormatter().parse(string);
                        }
                        catch (Exception e5) {
                            // null
                        }
                    }
                }
            }
        }

        return null;
    }

    abstract protected DateTimeFormatter getFullDateTimeFormatter();

    abstract protected DateTimeFormatter getLongDateTimeFormatter();

    abstract protected DateTimeFormatter getMediumDateTimeFormatter();

    abstract protected DateTimeFormatter getShortDateTimeFormatter();

    /**
     * Gets the default DateTimeFormatter to format/parse the LocalDate.
     *
     * @return the default DateTimeFormatter
     */
    public DateTimeFormatter getDefaultDateTimeFormatter() {
        return _defaultFormatter;
    }

    /**
     * Sets the default DateTimeFormatter to format/parse the LocalDate.
     *
     * @param defaultFormat the default DateTimeFormatter
     */
    public void setDefaultDateTimeFormatter(DateTimeFormatter defaultFormat) {
        _defaultFormatter = defaultFormat;
    }
}