/*
 * Copyright (C) 2005 Joe Walnes.
 * Copyright (C) 2006, 2007, 2011, 2013, 2014, 2015, 2016, 2017, 2018 XStream Committers.
 * All rights reserved.
 *
 * The software in this package is published under the terms of the BSD
 * style license a copy of which has been included with this distribution in
 * the LICENSE.txt file.
 * 
 * Created on 03. October 2005 by Joerg Schaible
 */
package com.thoughtworks.xstream.converters.extended;

import java.lang.reflect.InvocationTargetException;
import java.util.GregorianCalendar;

import com.thoughtworks.xstream.converters.SingleValueConverter;
import com.thoughtworks.xstream.converters.basic.AbstractSingleValueConverter;
import com.thoughtworks.xstream.core.JVM;


/**
 * A GregorianCalendarConverter conforming to the ISO8601 standard. The converter will always serialize the calendar
 * value in UTC and deserialize it to a value in the current default time zone.
 * 
 * @author Mauro Talevi
 * @author Jörg Schaible
 * @see <a href="http://www.iso.org/iso/home/store/catalogue_ics/catalogue_detail_ics.htm?csnumber=40874">ISO 8601</a>
 * @since 1.1.3
 */
public class ISO8601GregorianCalendarConverter extends AbstractSingleValueConverter {
    private final static Class[] EMPTY_CLASS_ARRAY = new Class[0];
    private final static Object[] EMPTY_OBJECT_ARRAY = new Object[0];
    private final SingleValueConverter converter;

    public ISO8601GregorianCalendarConverter() {
        SingleValueConverter svConverter = null;
        final Class type = JVM.loadClassForName(JVM.isVersion(8)
            ? "com.thoughtworks.xstream.core.util.ISO8601JavaTimeConverter"
            : "com.thoughtworks.xstream.core.util.ISO8601JodaTimeConverter");
        try {
            svConverter = (SingleValueConverter)type.getDeclaredConstructor(EMPTY_CLASS_ARRAY).newInstance(
                EMPTY_OBJECT_ARRAY);
        } catch (final InstantiationException e) {
            // ignore
        } catch (final IllegalAccessException e) {
            // ignore
        } catch (final InvocationTargetException e) {
            // ignore
        } catch (final NoSuchMethodException e) {
            // ignore
        }
        converter = svConverter;
    }

    public boolean canConvert(final Class type) {
        return converter != null && type == GregorianCalendar.class;
    }

    public Object fromString(final String str) {
        return converter.fromString(str);
    }

    public String toString(final Object obj) {
        return converter.toString(obj);
    }
}