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/*
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* JBind
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*
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* Copyright (c) by Stefan Wachter. All rights reserved.
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*
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* Usage, modification, and redistribution is subject to license terms that are
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* available at 'http://www.jbind.org'. The JBind license is like the
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* 'Apache Software License V 1.1'.
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*/
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package org.jbind.xml.instance.data;
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import java.math.BigDecimal;
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import org.jbind.util.other.StrBuffer;
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import org.jbind.xml.core.data.IDateTime;
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import org.jbind.xml.core.data.IDurationBase;
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import org.jbind.xml.core.data.ITime;
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import org.jbind.xml.core.data.ITimeZone;
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public class TimeHelper {
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private TimeHelper() {}
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public static ITime add(ITime aTime, ITimeZone aDuration) {
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int tmp, carry;
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int s = -aDuration.getSign();
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BigDecimal fraction = null;
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if ((null != aTime.getFraction()) && (null != aDuration.getFraction())) {
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fraction = (s == 1) ? aTime.getFraction().add(aDuration.getFraction()) : aTime.getFraction().subtract(aDuration.getFraction());
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} else if (null != aTime.getFraction()) {
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fraction = aTime.getFraction();
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} else if (null != aDuration.getFraction()) {
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fraction = (s == 1) ? aDuration.getFraction().negate() : aDuration.getFraction();
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}
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BigDecimal one = new BigDecimal("1");
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if (fraction.compareTo(one) > 0) {
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fraction = fraction.subtract(one);
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carry = 1;
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} else if (fraction.signum() < 0) {
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fraction = fraction.add(one);
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carry = -1;
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} else {
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carry = 0;
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}
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tmp = aTime.getSecond() + s * aDuration.getSeconds() + carry;
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carry = fQuotient(tmp, 60);
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int second = mod(tmp, 60, carry);
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tmp = aTime.getMinute() + s * aDuration.getMinutes() + carry;
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carry = fQuotient(tmp, 60);
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int minute = mod(tmp, 60, carry);
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tmp = aTime.getHour() + s * aDuration.getHours() + carry;
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carry = fQuotient(tmp, 24);
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int hour = mod(tmp, 24, carry);
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return new Time(hour, minute, second, fraction, aTime.hadTimeZone());
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}
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public static IDateTime add(IDateTime aDateTime, IDurationBase aDuration) {
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return addOrSubtract(aDateTime, aDuration, true);
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}
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public static IDateTime subtract(IDateTime aDateTime, IDurationBase aDuration) {
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return addOrSubtract(aDateTime, aDuration, false);
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}
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private static IDateTime addOrSubtract(IDateTime aDateTime, IDurationBase aDuration, boolean anAddNotSubtract) {
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int s = aDateTime.getSign() * aDuration.getSign();
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if (!anAddNotSubtract) {
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s *= -1;
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}
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int tmp, carry;
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tmp = aDateTime.getMonth() + s * aDuration.getMonths();
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carry = fQuotient(tmp, 1, 13);
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int month = modulo(tmp, 1, 13);
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int year = aDateTime.getYear() + s * aDuration.getYears() + carry;
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if (year == 0) {
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year += s;
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}
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BigDecimal fraction = null;
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if ((null != aDateTime.getFraction()) && (null != aDuration.getFraction())) {
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fraction = (s == 1) ? aDateTime.getFraction().add(aDuration.getFraction()) : aDateTime.getFraction().subtract(aDuration.getFraction());
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} else if (null != aDateTime.getFraction()) {
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fraction = aDateTime.getFraction();
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} else if (null != aDuration.getFraction()) {
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fraction = (s == 1) ? aDuration.getFraction().negate() : aDuration.getFraction();
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}
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if (null != fraction) {
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BigDecimal one = new BigDecimal("1");
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if (fraction.compareTo(one) > 0) {
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fraction = fraction.subtract(one);
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carry = 1;
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} else if (fraction.signum() < 0) {
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fraction = fraction.add(one);
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carry = -1;
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} else {
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carry = 0;
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}
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}
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tmp = aDateTime.getSecond() + s * aDuration.getSeconds() + carry;
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carry = fQuotient(tmp, 60);
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int second = mod(tmp, 60, carry);
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tmp = aDateTime.getMinute() + s * aDuration.getMinutes() + carry;
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carry = fQuotient(tmp, 60);
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int minute = mod(tmp, 60, carry);
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tmp = aDateTime.getHour() + s * aDuration.getHours() + carry;
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carry = fQuotient(tmp, 24);
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int hour = mod(tmp, 24, carry);
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int tmpDay;
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if (aDateTime.getDay() > maxDayInMonthFor(year, month)) {
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tmpDay = maxDayInMonthFor(year, month);
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} else {
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tmpDay = aDateTime.getDay();
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}
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int day = tmpDay + s * aDuration.getDays() + carry;
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while (true) {
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if (day < 1) {
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day = day + maxDayInMonthFor(year, month - 1);
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carry = -1;
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} else if (day > maxDayInMonthFor(year, month)) {
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day = day - maxDayInMonthFor(year, month);
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carry = 1;
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} else {
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break;
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}
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tmp = month + carry;
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month = modulo(tmp, 1, 13);
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year = year + fQuotient(tmp, 1, 13);
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if (year == 0) {
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year += s;
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}
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}
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int sign;
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if (year > 0) {
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sign = aDateTime.getSign();
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} else {
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sign = -aDateTime.getSign();
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year = -year;
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}
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return new DateTime(sign, year, month, day, hour, minute, second, fraction, aDateTime.hadTimeZone());
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}
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/**
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* Given {year,month} computes maximum
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* number of days for given month
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*
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* @param year
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* @param month
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* @return integer containg the number of days in a given month
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*/
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public static int maxDayInMonthFor(int aYear, int aMonth) {
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int month = modulo(aMonth, 1, 13);
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int year = aYear + fQuotient(aMonth, 1, 13);
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//validate days
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if ((month == 4) || (month == 6) || (month == 9) || (month == 11)) {
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return 30;
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} else if (month == 2) {
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if (isLeapYear(year)) {
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return 29;
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} else {
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return 28;
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}
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} else {
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return 31;
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}
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}
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private static boolean isLeapYear(int year) {
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if (year == 0) {
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return false;
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}
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//REVISIT: should we take care about Julian calendar?
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return ((year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0)));
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}
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private static int modulo(int a, int b) {
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return a - fQuotient(a, b) * b;
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}
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//
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// help function described in W3C PR Schema [E Adding durations to dateTimes]
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//
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private static int mod(int a, int b, int quotient) {
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//modulo(a, b) = a - fQuotient(a,b)*b
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return (a - quotient * b);
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}
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//
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// help function described in W3C PR Schema [E Adding durations to dateTimes]
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//
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private static int fQuotient(int a, int b) {
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//fQuotient(a, b) = the greatest integer less than or equal to a/b
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return (int)Math.floor((float)a / b);
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}
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//
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// help function described in W3C PR Schema [E Adding durations to dateTimes]
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//
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private static int modulo(int temp, int low, int high) {
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//modulo(a - low, high - low) + low
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int a = temp - low;
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int b = high - low;
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return (mod(a, b, fQuotient(a, b)) + low);
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}
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//
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// help function described in W3C PR Schema [E Adding durations to dateTimes]
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//
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private static int fQuotient(int temp, int low, int high) {
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//fQuotient(a - low, high - low)
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return fQuotient(temp - low, high - low);
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}
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public static void output(int anInt, int aLength, StrBuffer aStringBuffer) {
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StrBuffer b = new StrBuffer();
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int x = anInt;
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for (int i = 0; i < aLength; i++, x /= 10) {
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b.append((char)('0' + x % 10));
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}
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assert 0 == x;
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for (int i = b.length(); --i >= 0; ) {
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aStringBuffer.append(b.charAt(i));
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}
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}
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public static void output(int anInt, StrBuffer aStrBuffer) {
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int x = anInt;
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StrBuffer b = new StrBuffer();
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do {
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b.append((char)('0' + x % 10));
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x /= 10;
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} while (x != 0);
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for (int i = b.length(); --i >= 0; ) {
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aStrBuffer.append(b.charAt(i));
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}
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}
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}
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