--- old/make/src/classes/build/tools/tzdb/Utils.java 2014-06-16 09:40:12.000000000 -0700 +++ /dev/null 2014-05-19 13:38:05.886368312 -0700 @@ -1,176 +0,0 @@ -/* - * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. - * - * This code is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 only, as - * published by the Free Software Foundation. Oracle designates this - * particular file as subject to the "Classpath" exception as provided - * by Oracle in the LICENSE file that accompanied this code. - * - * This code 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 General Public License - * version 2 for more details (a copy is included in the LICENSE file that - * accompanied this code). - * - * You should have received a copy of the GNU General Public License version - * 2 along with this work; if not, write to the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. - * - * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA - * or visit www.oracle.com if you need additional information or have any - * questions. - */ - -/* - * Copyright (c) 2009-2012, Stephen Colebourne & Michael Nascimento Santos - * - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * * Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * - * * Redistributions in binary form must reproduce the above copyright notice, - * this list of conditions and the following disclaimer in the documentation - * and/or other materials provided with the distribution. - * - * * Neither the name of JSR-310 nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR - * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, - * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ -package build.tools.tzdb; - -import java.util.Objects; - -class Utils { - - // Returns the largest (closest to positive infinity) - public static long floorDiv(long x, long y) { - long r = x / y; - // if the signs are different and modulo not zero, round down - if ((x ^ y) < 0 && (r * y != x)) { - r--; - } - return r; - } - - // Returns the floor modulus of the {@code long} arguments. - public static long floorMod(long x, long y) { - return x - floorDiv(x, y) * y; - } - - // Returns the sum of its arguments, - public static long addExact(long x, long y) { - long r = x + y; - // HD 2-12 Overflow iff both arguments have the opposite sign of the result - if (((x ^ r) & (y ^ r)) < 0) { - throw new ArithmeticException("long overflow"); - } - return r; - } - - // Year - - // Returns true if the specified year is a leap year. - public static boolean isLeapYear(int year) { - return ((year & 3) == 0) && ((year % 100) != 0 || (year % 400) == 0); - } - - // The minimum supported year, '-999,999,999'. - public static final int YEAR_MIN_VALUE = -999_999_999; - - // The maximum supported year, '+999,999,999'. - public static final int YEAR_MAX_VALUE = 999_999_999; - - - // Gets the length of the specified month in days. - public static int lengthOfMonth(int month, boolean leapYear) { - switch (month) { - case 2: //FEBRUARY: - return (leapYear ? 29 : 28); - case 4: //APRIL: - case 6: //JUNE: - case 9: //SEPTEMBER: - case 11: //NOVEMBER: - return 30; - default: - return 31; - } - } - - // Gets the maximum length of the specified month in days. - public static int maxLengthOfMonth(int month) { - switch (month) { - case 2: //FEBRUARY: - return 29; - case 4: //APRIL: - case 6: //JUNE: - case 9: //SEPTEMBER: - case 11: //NOVEMBER: - return 30; - default: - return 31; - } - } - - // DayOfWeek - - // Returns the day-of-week that is the specified number of days after - // this one, from 1 to 7 for Monday to Sunday. - public static int plusDayOfWeek(int dow, long days) { - int amount = (int) (days % 7); - return (dow - 1 + (amount + 7)) % 7 + 1; - } - - // Returns the day-of-week that is the specified number of days before - // this one, from 1 to 7 for Monday to Sunday. - public static int minusDayOfWeek(int dow, long days) { - return plusDayOfWeek(dow, -(days % 7)); - } - - // Adjusts the date to the first occurrence of the specified day-of-week - // before the date being adjusted unless it is already on that day in - // which case the same object is returned. - public static LocalDate previousOrSame(LocalDate date, int dayOfWeek) { - return adjust(date, dayOfWeek, 1); - } - - // Adjusts the date to the first occurrence of the specified day-of-week - // after the date being adjusted unless it is already on that day in - // which case the same object is returned. - public static LocalDate nextOrSame(LocalDate date, int dayOfWeek) { - return adjust(date, dayOfWeek, 0); - } - - // Implementation of next, previous or current day-of-week. - // @param relative whether the current date is a valid answer - private static final LocalDate adjust(LocalDate date, int dow, int relative) { - int calDow = date.getDayOfWeek(); - if (relative < 2 && calDow == dow) { - return date; - } - if ((relative & 1) == 0) { - int daysDiff = calDow - dow; - return date.plusDays(daysDiff >= 0 ? 7 - daysDiff : -daysDiff); - } else { - int daysDiff = dow - calDow; - return date.minusDays(daysDiff >= 0 ? 7 - daysDiff : -daysDiff); - } - } - -}