DateConverterForJodaAbstract.java

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 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
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package org.apache.isis.viewer.wicket.ui.components.scalars.jodatime;

import org.apache.wicket.util.convert.ConversionException;
import org.joda.time.DateTime;
import org.joda.time.LocalDate;
import org.joda.time.LocalDateTime;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

import org.apache.isis.viewer.wicket.ui.components.scalars.DateConverterAbstract;

import java.util.Locale;

abstract class DateConverterForJodaAbstract<T> extends DateConverterAbstract<T> {
    
    private static final long serialVersionUID = 1L;
    
    DateConverterForJodaAbstract(Class<T> cls, String datePattern, String dateTimePattern, int adjustBy) {
        super(cls, datePattern, dateTimePattern, adjustBy);
    }

    @Override
    protected final T doConvertToObject(String value, Locale locale) {
        T dateTime = convert(value);
        return minusDays(dateTime, adjustBy);
    }

    @Override
    protected String doConvertToString(T value, Locale locale) {
        // for JodaLocalDate, the date time pattern is same as date pattern, so can use either to convert to string.
        T t = plusDays(value, adjustBy);
        return toString(t, getFormatterForDateTimePattern());
    }


    protected abstract T minusDays(T value, int adjustBy);
    protected abstract T plusDays(T value, int adjustBy);

    protected abstract T convert(String value) throws ConversionException;
    protected abstract String toString(T value, DateTimeFormatter dateTimeFormatter);

}