com.teamsun.framework.util.DateUtil.java Source code

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Here is the source code for com.teamsun.framework.util.DateUtil.java

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/* 
 * Copyright (c) 1994-2006 Teamsun
 * All rights reserved.
 *
 * This software is the confidential and proprietary information of Finalist IT Group, Inc.
 * You shall not disclose such Confidential Information and shall use it only in
 * accordance with the terms of the license agreement you entered into with Teamsun.
 * 
 */
package com.teamsun.framework.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * DateUtil.java
 * 
 * @author ?</a>
 * @version Revision:1.0 Date:2006-3-6 15:36:51 
 * /revision   
    
 * 
 * 
 * */

public class DateUtil {
    //~ Static fields/initializers =============================================

    private static Log log = LogFactory.getLog(DateUtil.class);
    private static String datePattern = "yyyy-MM-dd";
    private static String timePattern = "HH:mm";

    //~ Methods ================================================================

    /**
     * Return default datePattern (yyyy-MM-dd)
     * @return a string representing the date pattern on the UI
     */
    public static String getDatePattern() {
        return datePattern;
    }

    /**
     * This method attempts to convert an Oracle-formatted date
     * in the form dd-MMM-yyyy to yyyy-MM-dd.
     *
     * @param aDate date from database as a string
     * @return formatted string for the ui
     */
    public static final String getDate(Date aDate) {
        SimpleDateFormat df = null;
        String returnValue = "";

        if (aDate != null) {
            df = new SimpleDateFormat(datePattern);
            returnValue = df.format(aDate);
        }

        return (returnValue);
    }

    /**
     * This method generates a string representation of a date/time
     * in the format you specify on input
     *
     * @param aMask the date pattern the string is in
     * @param strDate a string representation of a date
     * @return a converted Date object
     * @see java.text.SimpleDateFormat
     * @throws ParseException
     */
    public static final Date convertStringToDate(String aMask, String strDate) throws ParseException {
        SimpleDateFormat df = null;
        Date date = null;
        df = new SimpleDateFormat(aMask);

        if (log.isDebugEnabled()) {
            log.debug("converting '" + strDate + "' to date with mask '" + aMask + "'");
        }

        try {
            date = df.parse(strDate);
        } catch (ParseException pe) {
            //log.error("ParseException: " + pe);
            throw new ParseException(pe.getMessage(), pe.getErrorOffset());
        }

        return (date);
    }

    /**
     * This method returns the current date time in the format:
     * yyyy-MM-dd HH:MM a
     *
     * @param theTime the current time
     * @return the current date/time
     */
    public static String getTimeNow(Date theTime) {
        return getDateTime(timePattern, theTime);
    }

    /**
     * This method returns the current date in the format: yyyy-MM-dd
     * 
     * @return the current date
     * @throws ParseException
     */
    public static Calendar getToday() throws ParseException {
        Date today = new Date();
        SimpleDateFormat df = new SimpleDateFormat(datePattern);

        // This seems like quite a hack (date -> string -> date),
        // but it works ;-)
        String todayAsString = df.format(today);
        Calendar cal = new GregorianCalendar();
        cal.setTime(convertStringToDate(todayAsString));

        return cal;
    }

    /**
     * This method generates a string representation of a date's date/time
     * in the format you specify on input
     *
     * @param aMask the date pattern the string is in
     * @param aDate a date object
     * @return a formatted string representation of the date
     * 
     * @see java.text.SimpleDateFormat
     */
    public static final String getDateTime(String aMask, Date aDate) {
        SimpleDateFormat df = null;
        String returnValue = "";

        if (aDate == null) {
            log.error("aDate is null!");
        } else {
            df = new SimpleDateFormat(aMask);
            returnValue = df.format(aDate);
        }

        return (returnValue);
    }

    /**
     * This method generates a string representation of a date based
     * on the System Property 'dateFormat'
     * in the format you specify on input
     * 
     * @param aDate A date to convert
     * @return a string representation of the date
     */
    public static final String convertDateToString(Date aDate) {
        return getDateTime(datePattern, aDate);
    }

    /**
     * This method converts a String to a date using the datePattern
     * 
     * @param strDate the date to convert (in format yyyy-MM-dd)
     * @return a date object
     * 
     * @throws ParseException
     */
    public static Date convertStringToDate(String strDate) throws ParseException {
        Date aDate = null;

        try {
            if (log.isDebugEnabled()) {
                log.debug("converting date with pattern: " + datePattern);
            }

            aDate = convertStringToDate(datePattern, strDate);
        } catch (ParseException pe) {
            log.error("Could not convert '" + strDate + "' to a date, throwing exception");
            pe.printStackTrace();
            throw new ParseException(pe.getMessage(), pe.getErrorOffset());

        }

        return aDate;
    }

}