Java Week getPreWeeks(int weekNum)

Description

Description:Get the start date - end date string before current week according to week number

specified by parameter The format is "yyyy/MM/dd-yyyy/MM/dd"

License

Open Source License

Parameter

Parameter	Description

Return

SortedMap

Declaration

public static SortedMap<Integer, String> getPreWeeks(int weekNum) 

Method Source Code

//package com.java2s;
/*/*from www  .  ja v  a2  s.co m*/
 * $RCSfile: DatetimeUtil,v $$
 * $Revision: 1.0  $
 * $Date: 2011  $
 *
 * Copyright (C) 2011 GyTech, Inc. All rights reserved.
 *
 * This software is the proprietary information of GyTech, Inc.
 * Use is subject to license terms.
 */

import java.text.DateFormatSymbols;

import java.text.SimpleDateFormat;

import java.util.Calendar;
import java.util.Date;

import java.util.Locale;
import java.util.SortedMap;
import java.util.TreeMap;

public class Main {
    /**array reprsents offset bewwen Monday and current date, start from Sunday*/
    private static final int[] offsets = { -6, 0, -1, -2, -3, -4, -5 };

    /**
     * <p>Description:Get the start date - end date string before current week according to week number</p>
     * specified by parameter
     * The format is "yyyy/MM/dd-yyyy/MM/dd"
     * @param int weekNum
     * @return SortedMap
     */
    public static SortedMap<Integer, String> getPreWeeks(int weekNum) {
        SortedMap<Integer, String> m = new TreeMap<Integer, String>();
        Calendar now = Calendar.getInstance();
        now.add(Calendar.DAY_OF_YEAR, -(7 * (weekNum - 1)));
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd", new DateFormatSymbols(Locale.US));

        int day = now.get(Calendar.DAY_OF_WEEK);
        int offset = offsets[day - Calendar.SUNDAY] - 1;
        now.add(Calendar.DAY_OF_YEAR, offset);
        String temp = null;

        for (int i = 0; i < weekNum; i++) {
            now.add(Calendar.DAY_OF_YEAR, +1);
            temp = formatter.format(now.getTime());
            now.add(Calendar.DAY_OF_YEAR, +6);
            temp += "-" + formatter.format(now.getTime());
            m.put(new Integer(i), temp);
        }

        return m;
    }

    /**
     * <p>Description:Get the start date - end date string according to selected base date and week number
     *                      The string format is "yyyy/MM/dd - yyyy/MM/dd"
     * </p>
     * @param int weekNum number of weeks contained in result string
     * @param Date baseDate start date of last week
     * @return SortedMap 
     */
    public static SortedMap<Integer, String> getPreWeeks(int weekNum, Date baseDate) {
        SortedMap<Integer, String> m = new TreeMap<Integer, String>();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(baseDate);
        calendar.add(Calendar.DAY_OF_YEAR, -(7 * (weekNum - 1) + 1));
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd", new DateFormatSymbols(Locale.US));
        String temp = "";

        for (int i = 0; i < weekNum; i++) {
            calendar.add(Calendar.DAY_OF_YEAR, +1);
            temp = formatter.format(calendar.getTime());
            calendar.add(Calendar.DAY_OF_YEAR, +6);
            temp += " - " + formatter.format(calendar.getTime());
            m.put(new Integer(i), temp);
        }

        return m;
    }
}

Related

1. currentWeekEndDate()
2. getNextWeek(String week)
3. getPreWeek(String week)
4. getPreWeekDayByStr(String curday)
5. getPreWeekDayByStr(String curday)
6. getStartDate(Date date, int weeks, Locale locale)
7. getStartDateOfWeek(Date selectedDate, Locale locale)
8. getThisWeek()
9. getThisWeek()