package com.sun.image.codec.jpeg;

/**
 * JPEGImageEncoder Interface
 * 
 * JPEGImageEncoder compresses images into JPEG data streams and
 * writes the JPEG stream to an OutputStream  ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = sdf.parse("2009-10-27 00:00:00");        
        TenDayScope tenDay = TenDayScope.getInstance();
        System.out.println(tenDay.contains(date));
    }
}

class TenDayScope {
    
    public final static int FIRST_TEN_DAY  = 0;
    public final static int SECOND_TEN_DAY = 1;
    public final static int THIRD_TEN_DAY  = 2;    
    
    private Calendar start;
    private Calendar end;
    
    private TenDayScope() {
        init();
    }
    
    public Calendar getStart() {
        return (Calendar)start.clone();
    }
    
    public Calendar getEnd() {
        return (Calendar)end.clone();
    }
    
    public static TenDayScope getInstance() {
        return new TenDayScope();
    }
    
    /**
     * 判断 Date 是否在本旬以及下旬之间
     * @param date
     * @return
     * 2009-10-27 下午01:42:07
     */
    public boolean contains(Date date) {
        if(date == null) {
            return false;
        }
        return contains(date.getTime());
    }
    
    /**
     * 判断 Calendar 是否在本旬以及下旬之间
     * @param date
     * @return
     * 2009-10-27 下午01:42:07
     */
    public boolean contains(Calendar calendar) {
        if(calendar == null) {
            return false;
        }
        return contains(calendar.getTimeInMillis());
    }
    
    /**
     * 判断 Unix 纪元毫秒数是否在本旬以及下旬之间
     * @param date
     * @return
     * 2009-10-27 下午01:42:07
     */
    public boolean contains(long millis) {
        return (millis >= start.getTimeInMillis()) && (millis < end.getTimeInMillis());
    }
    
    private void init() {
        {
            start = Calendar.getInstance();
            int t = getTenDay(start.get(Calendar.DATE));
            start.set(Calendar.DATE, getStartTenDay(t));
            clearHms(start);
        }
        
        {
            end = Calendar.getInstance();
            int t = getTenDay(end.get(Calendar.DATE));
            int endDay = getEndTenNextDay(t);
            if(t > FIRST_TEN_DAY) {
                end.add(Calendar.MONTH, 1);
            }
            end.set(Calendar.DATE, getEndTenNextDay(endDay));
            clearHms(end);
        }
    }
    
    /**
     * 清空 Calendar 日以下的字段
     * @param c
     * 2009-10-27 下午01:41:39
     */
    private void clearHms(Calendar c) {
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
    }
    
    /**
     * 根据当前旬次，获得该旬的第一天日
     * 
     * @param currentTenDay
     * @return
     * 2009-10-27 下午01:40:56
     */
    private int getStartTenDay(int currentTenDay) {
        return currentTenDay * 10 + 1;
    }
    
    /**
     * 根据当前旬次，获得下旬最后一天的后一天
     * @param currentTenDay
     * @return
     * 2009-10-27 下午01:41:18
     */
    private int getEndTenNextDay(int currentTenDay) {
        return (currentTenDay + 2) % 3 * 10 + 1;
    }
    
    /**
     * 根据日期获得旬次
     * @param day
     * 2009-10-27 下午01:40:28
     */
    private int getTenDay(int day) {
        int t = (day - 1) / 10;
        if(t > THIRD_TEN_DAY) {
            t = THIRD_TEN_DAY;
        }
        return t;
    }
    
    public String toString() {
        return String.format("start: %tF %<tT, end: %tF %<tT", start, end);
    }
}