Java Calendar Adjust truncCalendarToWeek(Calendar c, int adjustIncrement)

Description

trunc Calendar To Week

License

Open Source License

Declaration

public static void truncCalendarToWeek(Calendar c, int adjustIncrement) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2010-2015 BSI Business Systems Integration AG.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors://from w w  w.  j a  v  a2s  . co  m
 *     BSI Business Systems Integration AG - initial API and implementation
 ******************************************************************************/

import java.util.Calendar;

public class Main {
    public static void truncCalendarToWeek(Calendar c, int adjustIncrement) {
        truncCalendarToWeek(c, adjustIncrement, Calendar.getInstance().getFirstDayOfWeek());
    }

    /**
     * truncate the calendar to week
     *
     * @param adjustIncrement
     *          +1 or -1
     */
    public static void truncCalendarToWeek(Calendar c, int adjustIncrement, int firstDayOfWeek) {
        if (c == null) {
            return;
        }
        if (adjustIncrement < -1) {
            adjustIncrement = -1;
        }
        if (adjustIncrement > 1) {
            adjustIncrement = 1;
        }
        if (adjustIncrement == 0) {
            adjustIncrement = -1;
        }
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);

        while (c.get(Calendar.DAY_OF_WEEK) != firstDayOfWeek) {
            c.add(Calendar.DATE, adjustIncrement);
        }
    }
}

Related

1. adjustToDayEnd(Calendar cal)
2. adjustToFieldStart(Calendar cal, int[] fields)
3. adjustToMonthStart(Calendar cal)
4. getMidnightCalendarByUnadjustedDate(Date date, TimeZone timezone)
5. truncCalendarToWeek(Calendar c, int adjustIncrement)