MMLDate.java

package open.dolphin.util;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;

/**
 * Utility class to handle MML Date format.
 *
 * @author  Kazushi Minagawa, Digital Globe, Inc.
 */
public final class MMLDate extends Object {
    
    private static final String MML_DATETIME_PATTERN = "yyyy-MM-dd'T'HH:mm:ss";
    private static final String MML_DATE_PATTERN = "yyyy-MM-dd";
    private static final String MML_TIME_PATTERN = "HH:mm:ss";

    /** Creates new MMLDate */
    public MMLDate() {        
    }
    
    public static String warekiStringFromDate(Date d) {
        if (d==null) {
            return null;
        }
        Locale locale = new Locale("ja", "JP", "JP");
        DateFormat formatter = DateFormat.getDateInstance(DateFormat.FULL, locale);
        return formatter.format(d);
    }

    public static String warekiStringFromMMLDate(String mml) {
        if (mml == null) {
            return null;
        }
        int year = Integer.parseInt(mml.substring(0, 4));
        int month = Integer.parseInt(mml.substring(5, 7)) - 1;
        int date = Integer.parseInt(mml.substring(8, 10));
        GregorianCalendar gc = new GregorianCalendar(year, month, date);
        return warekiStringFromDate(gc.getTime());
    }
    
    public static String getDateTime(String pattern) {
        GregorianCalendar gc = new GregorianCalendar();
        SimpleDateFormat f = new SimpleDateFormat(pattern);
        return f.format(gc.getTime());
    }
    
    public static String getDateTime() {
        return getDateTime(new GregorianCalendar());
    }
    
    public static String getDate() {
        return getDate(new GregorianCalendar());
    }
    
    public static String getTime() {
        return getTime(new GregorianCalendar());
    }
    
    public static String getDateTime(GregorianCalendar gc) {
        SimpleDateFormat f = new SimpleDateFormat(MML_DATETIME_PATTERN);
        return f.format(gc.getTime());
    }

    public static String getDate(GregorianCalendar gc) {
        SimpleDateFormat f = new SimpleDateFormat(MML_DATE_PATTERN);
        return f.format(gc.getTime());
    }

    public static String getTime(GregorianCalendar gc) {
        SimpleDateFormat f = new SimpleDateFormat(MML_TIME_PATTERN);
        return f.format(gc.getTime());
    }
    
    public static String getDayFromToday(int n) {       
        GregorianCalendar gc = new GregorianCalendar();
        gc.add(Calendar.DAY_OF_MONTH, n);
        return getDate(gc);   
    }
    
    public static String getMonthFromToday(int n) {       
        GregorianCalendar gc = new GregorianCalendar();
        gc.add(Calendar.MONTH, n);
        return getDate(gc);   
    }
        
    public static String getYearFromToday(int n) {
        GregorianCalendar gc = new GregorianCalendar();
        gc.add(Calendar.YEAR, n);
        return getDate(gc); 
    }
    
    public static int[] getCalendarYMD(String mmlDate) {
     
        int[] ret = new int[3];
        try {
            StringTokenizer st = new StringTokenizer(mmlDate, "-");
            
            // Year
            String val = st.nextToken();
            ret[0] = Integer.parseInt(val);
            
            // Month
            val = st.nextToken();
            if (val.charAt(0) == '0') {
                val = val.substring(1);
            }
            ret[1] = Integer.parseInt(val) -1;
            
            // day
            val = st.nextToken();
            if (val.charAt(0) == '0') {
                val = val.substring(1);
            }
            ret[2] = Integer.parseInt(val);
        }
        catch (Exception e) {
            ret = null;
        }
        
        return ret;
    }
}