Java Week Day addMonthToFirstDayOfWeek(Calendar c, int dayOfWeek, int monthInterval)

Description

add Month To First Day Of Week

License

Open Source License

Declaration

private static void addMonthToFirstDayOfWeek(Calendar c, int dayOfWeek,
            int monthInterval) 

Method Source Code

//package com.java2s;
/*//from  w  ww. ja va 2s .c  om
 * #%L
 * Alfresco Repository
 * %%
 * Copyright (C) 2005 - 2016 Alfresco Software Limited
 * %%
 * This file is part of the Alfresco software. 
 * If the software was purchased under a paid Alfresco license, the terms of 
 * the paid license agreement will prevail.  Otherwise, the software is 
 * provided under the following open source license terms:
 * 
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Alfresco is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */

import java.util.*;

public class Main {
    private static void addMonthToFirstDayOfWeek(Calendar c, int dayOfWeek,
            int monthInterval) {
        // Go forward to the 1st of next month
        addMonthToDayOfMonth(c, 1, monthInterval);

        // Set the day of the week
        toDayOfWeekInMonth(c, dayOfWeek, 1);
    }

    private static void addMonthToDayOfMonth(Calendar c, int dayOfMonth,
            int monthInterval) {
        for (int i = 0; i < monthInterval; i++) {
            // Set it to the 1st
            c.set(Calendar.DAY_OF_MONTH, 1);
            // Add 33 days, will be on the 2nd-6th
            c.add(Calendar.DATE, 33);
            // Set to the requred day in the month
            c.set(Calendar.DAY_OF_MONTH, dayOfMonth);

            // If we set 31th of April, then calendar instance will be on 1st of May
            // So, set the last day of moth
            if (c.get(Calendar.DAY_OF_MONTH) != dayOfMonth) {
                c.set(Calendar.DAY_OF_MONTH, 1);
                c.add(Calendar.DAY_OF_MONTH, -1);
            }

        }
    }

    /**
     * Takes you to eg the 2nd Thursday in the month, which may
     *  involve going back before the current date  
     */
    private static void toDayOfWeekInMonth(Calendar c, int dayOfWeek,
            int weekInMonth) {
        //set it to the first day
        c.set(Calendar.DATE, 1);
        //move to the day we need
        c.set(Calendar.DAY_OF_WEEK, dayOfWeek);
        //and then to the month
        c.set(Calendar.DAY_OF_WEEK_IN_MONTH, weekInMonth);
    }
}

Related

1. calculateFloatingHoliday(int nth, int dayOfWeek, int year, int month)
2. dayOfWeek()
3. dayOfWeek(Date pWallDate)
4. dayOfWeek(final Date date)