/*
 * $Id: RecurrenceUtil.java,v 1.1 2008/02/06 10:43:22 linkconsulting Exp $
 *
 * Copyright (c) 2001 The Open For Business Project - www.ofbiz.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
 * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package org.ofbiz.service.calendar;

import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

/**
 * Recurrence Utilities
 *
 * @author     <a href="mailto:jaz@ofbiz.org">Andy Zeneski</a>
 * @version    $Rev: 5462 $
 * @since      2.0
 */
public class RecurrenceUtil {

    /** Returns a Date object from a String. */
    public static Date parseDate(String dateStr) {
        String formatString = new String();

        if (dateStr.length() == 16)
            dateStr = dateStr.substring(0, 14);
        if (dateStr.length() == 15)
            formatString = "yyyyMMdd'T'hhmmss";
        if (dateStr.length() == 8)
            formatString = "yyyyMMdd";

        SimpleDateFormat formatter = new SimpleDateFormat(formatString);
        ParsePosition pos = new ParsePosition(0);

        return formatter.parse(dateStr, pos);
    }

    /** Returns a List of parsed date strings. */
    public static List parseDateList(List dateList) {
        List newList = new ArrayList();

        if (dateList == null)
            return newList;
        Iterator i = dateList.iterator();

        while (i.hasNext())
            newList.add(parseDate((String) i.next()));
        return newList;
    }

    /** Returns a String from a Date object */
    public static String formatDate(Date date) {
        String formatString = new String();
        Calendar cal = Calendar.getInstance();

        cal.setTime(date);
        if (cal.isSet(Calendar.MINUTE))
            formatString = "yyyyMMdd'T'hhmmss";
        else
            formatString = "yyyyMMdd";
        SimpleDateFormat formatter = new SimpleDateFormat(formatString);

        return formatter.format(date);
    }

    /** Returns a Llist of date strings from a List of Date objects */
    public static List formatDateList(List dateList) {
        List newList = new ArrayList();
        Iterator i = dateList.iterator();

        while (i.hasNext())
            newList.add(formatDate((Date) i.next()));
        return newList;
    }

    /** Returns the time as of now. */
    public static long now() {
        return (new Date()).getTime();
    }

}

