time.java

一个工作流设计及定义的系统,可以直接与数据库结合进行系统工作流程的定义及应用.

/*
 * Copyright (c) 2005, John Mettraux, OpenWFE.org
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 * . Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.  
 * 
 * . Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * 
 * . Neither the name of the "OpenWFE" nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * $Id: Time.java,v 1.7 2005/05/17 16:40:17 jmettraux Exp $
 */

//
// Time.java
//
// [e-mail]
//
// generated with 
// jtmpl 1.1.00 16.08.2003 John Mettraux ([e-mail])
//

package openwfe.org.time;

import java.text.SimpleDateFormat;


/**
 * A utility class : some methods for playing with time
 *
 * <p><font size=2>CVS Info :
 * <br>$Author: jmettraux $
 * <br>$Id: Time.java,v 1.7 2005/05/17 16:40:17 jmettraux Exp $ </font>
 *
 * @author [e-mail]
 */
public abstract class Time
{

    /**
     * This method turns strings like '10h10m1s' into milliseconds.
     * If a number is given without end char, it is considered to be in
     * milliseconds directly.
     * This method understands :
     * <ul>
     *     <li>'w' weeks</li>
     *     <li>'d' days</li>
     *     <li>'h' hours</li>
     *     <li>'m' minutes</li>
     *     <li>'s' seconds</li>
     *     <li>'M' month</li>
     *     <li>'y' year</li>
     * </ul>
     */
    public static long parseTimeString (String time)
    {
        time = time.trim();

        int index = -1;
        long result = 0;

        String number = "";

        while (true)
        {
            index++;

            if (index >= time.length())
            {
                if (number.length() > 0)
                    result += Integer.parseInt(number);

                break;
            }

            char c = time.charAt(index);

            if (java.lang.Character.isDigit(c))
            {
                number += c;
                continue;
            }

            long value = Long.parseLong(number);
            number = "";

            if (c == 'y') // year
            {
                result += (value * 365 * 24 * 3600 * 1000);
            }
            else if (c == 'M') // month
            {
                result += (value * 30 * 24 * 3600 * 1000);
            }
            else if (c == 'w') // week
            {
                result += (value * 7 * 24 * 3600 * 1000);
            }
            else if (c == 'd') // day
            {
                result += (value * 24 * 3600 * 1000);
            }
            else if (c == 'h') // hour
            {
                result += (value * 3600 * 1000);
            }
            else if (c == 'm') // minute
            {
                result += (value * 60 * 1000);
            }
            else if (c == 's') // second
            {
                result += (value * 1000);
            }
            /*
             * some code from 'dgsh' :-)
             * (this method is copy-pasted 
             * from dgsh (http://sf.net/projects/dgsh))
             *
            else if (c == 'r') // round
            {
                result += (value * 6 * 1000);
            }
             *
             */
            else 
                // time is expressed in milliseconds
            {
                result += value;
            }
        }

        return result;
    }

    //
    // ISO DATE stuff

    private final static SimpleDateFormat sdf =
        new SimpleDateFormat("yyyy-MM-dd HH:mm:ssZ");

    /**
     * Turns a time expressed as a long to a ISO (postgres) date format
     * like '1997-12-17 07:37:16-0800'.
     */
    public static String toIsoDate (final long time)
    {
        java.util.Date d = new java.util.Date(time);
        return sdf.format(d);
    }

    /**
     * Turns the current time to a ISO (postgres) date format
     * like '1997-12-17 07:37:16-0800'.
     */
    public static String toIsoDate ()
    {
        return toIsoDate(System.currentTimeMillis());
    }

    /**
     * Turns the ISO date into date as a long value (number of millisecs
     * sine the Epoch).
     */
    public static long fromIsoDate (final String sDate)
        throws java.text.ParseException
    {
        return sdf.parse(sDate).getTime();
    }

}