/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 1999-2005 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.sun.org.apache.xerces.internal.impl.dv.xs;

import java.math.BigDecimal;

import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.Duration;
import javax.xml.datatype.XMLGregorianCalendar;

import com.sun.org.apache.xerces.internal.impl.Constants;
import com.sun.org.apache.xerces.internal.jaxp.datatype.DatatypeFactoryImpl;
import com.sun.org.apache.xerces.internal.xs.datatypes.XSDateTime;

/**
 * This is the base class of all date/time datatype validators.
 * It implements common code for parsing, validating and comparing datatypes.
 * Classes that extend this class, must implement parse() method.
 *
 * REVISIT: There are many instance variables, which would cause problems
 *          when we support grammar caching. A grammar is possibly used by
 *          two parser instances at the same time, then the same simple type
 *          decl object can be used to validate two strings at the same time.
 *          -SG
 *
 * @xerces.internal
 *
 * @author Elena Litani
 * @author Len Berman
 * @author Gopal Sharma, SUN Microsystems Inc.
 *
 * @version $Id: AbstractDateTimeDV.java,v 1.7 2010-11-01 04:39:46 joehw Exp $
 */
public abstract class AbstractDateTimeDV extends TypeValidator {

        //debugging
        private static final boolean DEBUG=false;

        //define shared variables for date/time


        //define constants to be used in assigning default values for
        //all date/time excluding duration
        protected final static int YEAR=2000;
        protected final static int MONTH=01;
        protected final static int DAY = 01;

    protected static final DatatypeFactory datatypeFactory = new DatatypeFactoryImpl();

        public short getAllowedFacets(){
                return ( XSSimpleTypeDecl.FACET_PATTERN | XSSimpleTypeDecl.FACET_WHITESPACE | XSSimpleTypeDecl.FACET_ENUMERATION |XSSimpleTypeDecl.FACET_MAXINCLUSIVE |XSSimpleTypeDecl.FACET_MININCLUSIVE | XSSimpleTypeDecl.FACET_MAXEXCLUSIVE  | XSSimpleTypeDecl.FACET_MINEXCLUSIVE  );
        }//getAllowedFacets()


        // distinguishes between identity and equality for date/time values
        // ie: two values representing the same "moment in time" but with different
        // remembered timezones are now equal but not identical.
        public boolean isIdentical (Object value1, Object value2) {
                if (!(value1 instanceof DateTimeData) || !(value2 instanceof DateTimeData)) {
                        return false;
                }

                DateTimeData v1 = (DateTimeData)value1;
                DateTimeData v2 = (DateTimeData)value2;

                // original timezones must be the same in addition to date/time values
                // being 'equal'
                if ((v1.timezoneHr == v2.timezoneHr) && (v1.timezoneMin == v2.timezoneMin)) {
                        return v1.equals(v2);
                }

                return false;
        }//isIdentical()

        // the parameters are in compiled form (from getActualValue)
        public int compare (Object value1, Object value2) {
                return compareDates(((DateTimeData)value1),
                                ((DateTimeData)value2), true);
        }//compare()

        /**
         * Compare algorithm described in dateDime (3.2.7).
         * Duration datatype overwrites this method
         *
         * @param date1  normalized date representation of the first value
         * @param date2  normalized date representation of the second value
         * @param strict
         * @return less, greater, less_equal, greater_equal, equal
         */
        protected short compareDates(DateTimeData date1, DateTimeData date2, boolean strict) {
                if (date1.utc == date2.utc) {
                        return compareOrder(date1, date2);
                }
                short c1, c2;

                DateTimeData tempDate = new DateTimeData(null, this);

                if ( date1.utc=='Z' ) {

                        //compare date1<=date1<=(date2 with time zone -14)
                        //
                        cloneDate(date2, tempDate); //clones date1 value to global temporary storage: fTempDate
                        tempDate.timezoneHr=14;
                        tempDate.timezoneMin = 0;
                        tempDate.utc='+';
                        normalize(tempDate);
                        c1 = compareOrder(date1, tempDate);
                        if (c1 == LESS_THAN)
                                return c1;

                        //compare date1>=(date2 with time zone +14)
                        //
                        cloneDate(date2, tempDate); //clones date1 value to global temporary storage: tempDate
                        tempDate.timezoneHr = -14;
                        tempDate.timezoneMin = 0;
                        tempDate.utc='-';
                        normalize(tempDate);
                        c2 = compareOrder(date1, tempDate);
                        if (c2 == GREATER_THAN)
                                return c2;

                        return INDETERMINATE;
                }
                else if ( date2.utc=='Z' ) {

                        //compare (date1 with time zone -14)<=date2
                        //
                        cloneDate(date1, tempDate); //clones date1 value to global temporary storage: tempDate
                        tempDate.timezoneHr = -14;
                        tempDate.timezoneMin = 0;
                        tempDate.utc='-';
                        if (DEBUG) {
                                System.out.println("tempDate=" + dateToString(tempDate));
                        }
                        normalize(tempDate);
                        c1 = compareOrder(tempDate, date2);
                        if (DEBUG) {
                                System.out.println("date=" + dateToString(date2));
                                System.out.println("tempDate=" + dateToString(tempDate));
                        }
                        if (c1 == LESS_THAN)
                                return c1;

                        //compare (date1 with time zone +14)<=date2
                        //
                        cloneDate(date1, tempDate); //clones date1 value to global temporary storage: tempDate
                        tempDate.timezoneHr = 14;
                        tempDate.timezoneMin = 0;
                        tempDate.utc='+';
                        normalize(tempDate);
                        c2 = compareOrder(tempDate, date2);
                        if (DEBUG) {
                                System.out.println("tempDate=" + dateToString(tempDate));
                        }
                        if (c2 == GREATER_THAN)
                                return c2;

                        return INDETERMINATE;
                }
                return INDETERMINATE;

        }

        /**
         * Given normalized values, determines order-relation
         * between give date/time objects.
         *
         * @param date1  date/time object
         * @param date2  date/time object
         * @return 0 if date1 and date2 are equal, a value less than 0 if date1 is less than date2, a value greater than 0 if date1 is greater than date2
         */
        protected short compareOrder(DateTimeData date1, DateTimeData date2) {
                if(date1.position < 1) {
                        if (date1.year < date2.year)
                                return -1;
                        if (date1.year > date2.year)
                                return 1;
                }
                if(date1.position < 2) {
                        if (date1.month < date2.month)
                                return -1;
                        if (date1.month > date2.month)
                                return 1;
                }
                if (date1.day < date2.day)
                        return -1;
                if (date1.day > date2.day)
                        return 1;
                if (date1.hour < date2.hour)
                        return -1;
                if (date1.hour > date2.hour)
                        return 1;
                if (date1.minute < date2.minute)
                        return -1;
                if (date1.minute > date2.minute)
                        return 1;
                if (date1.second < date2.second)
                        return -1;
                if (date1.second > date2.second)
                        return 1;
                if (date1.utc < date2.utc)
                        return -1;
                if (date1.utc > date2.utc)
                        return 1;
                return 0;
        }

        /**
         * Parses time hh:mm:ss.sss and time zone if any
         *
         * @param start
         * @param end
         * @param data
         * @exception RuntimeException
         */
        protected  void getTime (String buffer, int start, int end, DateTimeData data) throws RuntimeException{

                int stop = start+2;

                //get hours (hh)
                data.hour=parseInt(buffer, start,stop);

                //get minutes (mm)

                if (buffer.charAt(stop++)!=':') {
                        throw new RuntimeException("Error in parsing time zone" );
                }
                start = stop;
                stop = stop+2;
                data.minute=parseInt(buffer, start,stop);

                //get seconds (ss)
                if (buffer.charAt(stop++)!=':') {
                        throw new RuntimeException("Error in parsing time zone" );
                }

                //find UTC sign if any
                int sign = findUTCSign(buffer, start, end);

                //get seconds (ms)
                start = stop;
                stop = sign < 0 ? end : sign;
                data.second = parseSecond(buffer, start, stop);

                //parse UTC time zone (hh:mm)
                if (sign > 0) {
                        getTimeZone(buffer, data, sign, end);
                }
        }

        /**
         * Parses date CCYY-MM-DD
         *
         * @param buffer
         * @param start start position
         * @param end end position
         * @param date
         * @exception RuntimeException
         */
        protected int getDate (String buffer, int start, int end, DateTimeData date) throws RuntimeException{

                start = getYearMonth(buffer, start, end, date);

                if (buffer.charAt(start++) !='-') {
                        throw new RuntimeException("CCYY-MM must be followed by '-' sign");
                }
                int stop = start + 2;
                date.day=parseInt(buffer, start, stop);
                return stop;
        }

        /**
         * Parses date CCYY-MM
         *
         * @param buffer
         * @param start start position
         * @param end end position
         * @param date
         * @exception RuntimeException
         */
        protected int getYearMonth (String buffer, int start, int end, DateTimeData date) throws RuntimeException{

                if ( buffer.charAt(0)=='-' ) {
                        // REVISIT: date starts with preceding '-' sign
                        //          do we have to do anything with it?
                        //
                        start++;
                }
                int i = indexOf(buffer, start, end, '-');
                if ( i==-1 ) throw new RuntimeException("Year separator is missing or misplaced");
                int length = i-start;
                if (length<4) {
                        throw new RuntimeException("Year must have 'CCYY' format");
                }
                else if (length > 4 && buffer.charAt(start)=='0'){
                        throw new RuntimeException("Leading zeros are required if the year value would otherwise have fewer than four digits; otherwise they are forbidden");
                }
                date.year= parseIntYear(buffer, i);
                if (buffer.charAt(i)!='-') {
                        throw new RuntimeException("CCYY must be followed by '-' sign");
                }
                start = ++i;
                i = start +2;
                date.month=parseInt(buffer, start, i);
                return i; //fStart points right after the MONTH
        }

        /**
         * Shared code from Date and YearMonth datatypes.
         * Finds if time zone sign is present
         *
         * @param end
         * @param date
         * @exception RuntimeException
         */
        protected void parseTimeZone (String buffer, int start, int end, DateTimeData date) throws RuntimeException{

                //fStart points right after the date

                if ( start < end ) {
                        if (!isNextCharUTCSign(buffer, start, end)) {
                                throw new RuntimeException ("Error in month parsing");
                        }
                        else {
                                getTimeZone(buffer, date, start, end);
                        }
                }
        }

        /**
         * Parses time zone: 'Z' or {+,-} followed by  hh:mm
         *
         * @param data
         * @param sign
         * @exception RuntimeException
         */
        protected void getTimeZone (String buffer, DateTimeData data, int sign, int end) throws RuntimeException{
                data.utc=buffer.charAt(sign);

                if ( buffer.charAt(sign) == 'Z' ) {
                        if (end>(++sign)) {
                                throw new RuntimeException("Error in parsing time zone");
                        }
                        return;
                }
                if ( sign<=(end-6) ) {

                        int negate = buffer.charAt(sign) == '-'?-1:1;
                        //parse hr
                        int stop = ++sign+2;
                        data.timezoneHr = negate*parseInt(buffer, sign, stop);
                        if (buffer.charAt(stop++)!=':') {
                                throw new RuntimeException("Error in parsing time zone" );
                        }

                        //parse min
                        data.timezoneMin = negate*parseInt(buffer, stop, stop+2);

                        if ( stop+2!=end ) {
                                throw new RuntimeException("Error in parsing time zone");
                        }
            if(data.timezoneHr != 0 || data.timezoneMin != 0)
                data.normalized = false;
                }
                else {
                        throw new RuntimeException("Error in parsing time zone");
                }
                if ( DEBUG ) {
                        System.out.println("time[hh]="+data.timezoneHr + " time[mm]=" +data.timezoneMin);
                }
        }

        /**
         * Computes index of given char within StringBuffer
         *
         * @param start
         * @param end
         * @param ch     character to look for in StringBuffer
         * @return index of ch within StringBuffer
         */
        protected  int indexOf (String buffer, int start, int end, char ch) {
                for ( int i=start;i<end;i++ ) {
                        if ( buffer.charAt(i) == ch ) {
                                return i;
                        }
                }
                return -1;
        }

        /**
         * Validates given date/time object accoring to W3C PR Schema
         * [D.1 ISO 8601 Conventions]
         *
         * @param data
         */
        protected void validateDateTime (DateTimeData data) {

                //REVISIT: should we throw an exception for not valid dates
                //          or reporting an error message should be sufficient?

                /**
                 * XML Schema 1.1 - RQ-123: Allow year 0000 in date related types.
                 */
                if (!Constants.SCHEMA_1_1_SUPPORT && data.year==0 ) {
                        throw new RuntimeException("The year \"0000\" is an illegal year value");

                }

                if ( data.month<1 || data.month>12 ) {
                        throw new RuntimeException("The month must have values 1 to 12");

                }

                //validate days
                if ( data.day>maxDayInMonthFor(data.year, data.month) || data.day<1 ) {
                        throw new RuntimeException("The day must have values 1 to 31");
                }

                //validate hours
                if ( data.hour>23 || data.hour<0 ) {
                        if (data.hour == 24 && data.minute == 0 && data.second == 0) {
                                data.hour = 0;
                                if (++data.day > maxDayInMonthFor(data.year, data.month)) {
                                        data.day = 1;
                                        if (++data.month > 12) {
                                                data.month = 1;
                                                if (Constants.SCHEMA_1_1_SUPPORT) {
                                                        ++data.year;
                                                }
                                                else if (++data.year == 0) {
                                                        data.year = 1;
                                                }
                                        }
                                }
                        }
                        else {
                                throw new RuntimeException("Hour must have values 0-23, unless 24:00:00");
                        }
                }

                //validate
                if ( data.minute>59 || data.minute<0 ) {
                        throw new RuntimeException("Minute must have values 0-59");
                }

                //validate
                if ( data.second>=60 || data.second<0 ) {
                        throw new RuntimeException("Second must have values 0-59");

                }

                //validate
                if ( data.timezoneHr>14 || data.timezoneHr<-14 ) {
                        throw new RuntimeException("Time zone should have range -14:00 to +14:00");
                }
                else {
                        if((data.timezoneHr == 14 || data.timezoneHr == -14) && data.timezoneMin != 0)
                                throw new RuntimeException("Time zone should have range -14:00 to +14:00");
                        else if(data.timezoneMin > 59 || data.timezoneMin < -59)
                                throw new RuntimeException("Minute must have values 0-59");
                }

        }

        /**
         * Return index of UTC char: 'Z', '+', '-'
         *
         * @param start
         * @param end
         * @return index of the UTC character that was found
         */
        protected int findUTCSign (String buffer, int start, int end) {
                int c;
                for ( int i=start;i<end;i++ ) {
                        c=buffer.charAt(i);
                        if ( c == 'Z' || c=='+' || c=='-' ) {
                                return i;
                        }

                }
                return -1;
        }

    /**
     * Returns <code>true</code> if the character at start is 'Z', '+' or '-'.
     */
    protected final boolean isNextCharUTCSign(String buffer, int start, int end) {
        if (start < end) {
            char c = buffer.charAt(start);
            return (c == 'Z' || c == '+' || c == '-');
        }
        return false;
    }

        /**
         * Given start and end position, parses string value
         *
         * @param buffer string to parse
         * @param start  start position
         * @param end    end position
         * @return  return integer representation of characters
         */
        protected  int parseInt (String buffer, int start, int end)
        throws NumberFormatException{
                //REVISIT: more testing on this parsing needs to be done.
                int radix=10;
                int result = 0;
                int digit=0;
                int limit = -Integer.MAX_VALUE;
                int multmin = limit / radix;
                int i = start;
                do {
                        digit = getDigit(buffer.charAt(i));
                        if ( digit < 0 ) throw new NumberFormatException("'" + buffer + "' has wrong format");
                        if ( result < multmin ) throw new NumberFormatException("'" + buffer + "' has wrong format");
                        result *= radix;
                        if ( result < limit + digit ) throw new NumberFormatException("'" + buffer + "' has wrong format");
                        result -= digit;

                }while ( ++i < end );
                return -result;
        }

        // parse Year differently to support negative value.
        protected int parseIntYear (String buffer, int end){
                int radix=10;
                int result = 0;
                boolean negative = false;
                int i=0;
                int limit;
                int multmin;
                int digit=0;

                if (buffer.charAt(0) == '-'){
                        negative = true;
                        limit = Integer.MIN_VALUE;
                        i++;

                }
                else{
                        limit = -Integer.MAX_VALUE;
                }
                multmin = limit / radix;
                while (i < end)
                {
                        digit = getDigit(buffer.charAt(i++));
                        if (digit < 0) throw new NumberFormatException("'" + buffer + "' has wrong format");
                        if (result < multmin) throw new NumberFormatException("'" + buffer + "' has wrong format");
                        result *= radix;
                        if (result < limit + digit) throw new NumberFormatException("'" + buffer + "' has wrong format");
                        result -= digit;
                }

                if (negative)
                {
                        if (i > 1) return result;
                        else throw new NumberFormatException("'" + buffer + "' has wrong format");
                }
                return -result;

        }

        /**
         * If timezone present - normalize dateTime  [E Adding durations to dateTimes]
         *
         * @param date   CCYY-MM-DDThh:mm:ss+03
         */
        protected void normalize(DateTimeData date) {

                // REVISIT: we have common code in addDuration() for durations
                //          should consider reorganizing it.
                //

                //add minutes (from time zone)
                int negate = -1;

                if ( DEBUG ) {
                        System.out.println("==>date.minute"+date.minute);
                        System.out.println("==>date.timezoneMin" +date.timezoneMin);
                }
                int temp = date.minute + negate * date.timezoneMin;
                int carry = fQuotient (temp, 60);
                date.minute= mod(temp, 60, carry);

                if ( DEBUG ) {
                        System.out.println("==>carry: " + carry);
                }
                //add hours
                temp = date.hour + negate * date.timezoneHr + carry;
                carry = fQuotient(temp, 24);
                date.hour=mod(temp, 24, carry);
                if ( DEBUG ) {
                        System.out.println("==>date.hour"+date.hour);
                        System.out.println("==>carry: " + carry);
                }

                date.day=date.day+carry;

                while ( true ) {
                        temp=maxDayInMonthFor(date.year, date.month);
                        if (date.day<1) {
                                date.day = date.day + maxDayInMonthFor(date.year, date.month-1);
                                carry=-1;
                        }
                        else if ( date.day>temp ) {
                                date.day=date.day-temp;
                                carry=1;
                        }
                        else {
                                break;
                        }
                        temp=date.month+carry;
                        date.month=modulo(temp, 1, 13);
                        date.year=date.year+fQuotient(temp, 1, 13);
            if(date.year == 0 && !Constants.SCHEMA_1_1_SUPPORT) {
                date.year = (date.timezoneHr < 0 || date.timezoneMin < 0)?1:-1;
            }
                }
                date.utc='Z';
        }


        /**
     * @param date
     */
    protected void saveUnnormalized(DateTimeData date) {
        date.unNormYear = date.year;
        date.unNormMonth = date.month;
        date.unNormDay = date.day;
        date.unNormHour = date.hour;
        date.unNormMinute = date.minute;
        date.unNormSecond = date.second;
    }

    /**
         * Resets object representation of date/time
         *
         * @param data   date/time object
         */
        protected void resetDateObj(DateTimeData data) {
                data.year = 0;
                data.month = 0;
                data.day = 0;
                data.hour = 0;
                data.minute = 0;
                data.second = 0;
                data.utc = 0;
                data.timezoneHr = 0;
                data.timezoneMin = 0;
        }

        /**
         * Given {year,month} computes maximum
         * number of days for given month
         *
         * @param year
         * @param month
         * @return integer containg the number of days in a given month
         */
        protected int maxDayInMonthFor(int year, int month) {
                //validate days
                if ( month==4 || month==6 || month==9 || month==11 ) {
                        return 30;
                }
                else if ( month==2 ) {
                        if ( isLeapYear(year) ) {
                                return 29;
                        }
                        else {
                                return 28;
                        }
                }
                else {
                        return 31;
                }
        }

        private boolean isLeapYear(int year) {

                //REVISIT: should we take care about Julian calendar?
                return((year%4 == 0) && ((year%100 != 0) || (year%400 == 0)));
        }

        //
        // help function described in W3C PR Schema [E Adding durations to dateTimes]
        //
        protected int mod (int a, int b, int quotient) {
                //modulo(a, b) = a - fQuotient(a,b)*b
                return (a - quotient*b) ;
        }

        //
        // help function described in W3C PR Schema [E Adding durations to dateTimes]
        //
        protected int fQuotient (int a, int b) {

                //fQuotient(a, b) = the greatest integer less than or equal to a/b
                return (int)Math.floor((float)a/b);
        }

        //
        // help function described in W3C PR Schema [E Adding durations to dateTimes]
        //
        protected int modulo (int temp, int low, int high) {
                //modulo(a - low, high - low) + low
                int a = temp - low;
                int b = high - low;
                return (mod (a, b, fQuotient(a, b)) + low) ;
        }

        //
        // help function described in W3C PR Schema [E Adding durations to dateTimes]
        //
        protected int fQuotient (int temp, int low, int high) {
                //fQuotient(a - low, high - low)

                return fQuotient(temp - low, high - low);
        }


        protected String dateToString(DateTimeData date) {
                StringBuffer message = new StringBuffer(25);
                append(message, date.year, 4);
                message.append('-');
                append(message, date.month, 2);
                message.append('-');
                append(message, date.day, 2);
                message.append('T');
                append(message, date.hour, 2);
                message.append(':');
                append(message, date.minute, 2);
                message.append(':');
                append(message, date.second);
                append(message, (char)date.utc, 0);
                return message.toString();
        }

        protected final void append(StringBuffer message, int value, int nch) {
        if (value == Integer.MIN_VALUE) {
            message.append(value);
            return;
        }
                if (value < 0) {
                        message.append('-');
                        value = -value;
                }
                if (nch == 4) {
                        if (value < 10)
                                message.append("000");
                        else if (value < 100)
                                message.append("00");
                        else if (value < 1000)
                                message.append('0');
                        message.append(value);
                }
                else if (nch == 2) {
                        if (value < 10)
                                message.append('0');
                        message.append(value);
                }
                else {
                        if (value != 0)
                                message.append((char)value);
                }
        }

        protected final void append(StringBuffer message, double value) {
            if (value < 0) {
                message.append('-');
                value = -value;
            }
            if (value < 10) {
                message.append('0');
            }
            append2(message, value);
        }

    protected final void append2(StringBuffer message, double value) {
        final int intValue = (int) value;
        if (value == intValue) {
            message.append(intValue);
        }
        else {
            append3(message, value);
        }
    }

    private void append3(StringBuffer message, double value) {
        String d = String.valueOf(value);
        int eIndex = d.indexOf('E');
        if (eIndex == -1) {
            message.append(d);
            return;
        }
        int exp;
        if (value < 1) {
            // Need to convert from scientific notation of the form
            // n.nnn...E-N (N >= 4) to a normal decimal value.
            try {
                exp = parseInt(d, eIndex+2, d.length());
            }
            // This should never happen.
            // It's only possible if String.valueOf(double) is broken.
            catch (Exception e) {
                message.append(d);
                return;
            }
            message.append("0.");
            for (int i = 1; i < exp; ++i) {
                message.append('0');
            }
            // Remove trailing zeros.
            int end = eIndex - 1;
            while (end > 0) {
                char c = d.charAt(end);
                if (c != '0') {
                    break;
                }
                --end;
            }
            // Now append the digits to the end. Skip over the decimal point.
            for (int i = 0; i <= end; ++i) {
                char c = d.charAt(i);
                if (c != '.') {
                    message.append(c);
                }
            }
        }
        else {
            // Need to convert from scientific notation of the form
            // n.nnn...EN (N >= 7) to a normal decimal value.
            try {
                exp = parseInt(d, eIndex+1, d.length());
            }
            // This should never happen.
            // It's only possible if String.valueOf(double) is broken.
            catch (Exception e) {
                message.append(d);
                return;
            }
            final int integerEnd = exp + 2;
            for (int i = 0; i < eIndex; ++i) {
                char c = d.charAt(i);
                if (c != '.') {
                    if (i == integerEnd) {
                        message.append('.');
                    }
                    message.append(c);
                }
            }
            // Append trailing zeroes if necessary.
            for (int i = integerEnd - eIndex; i > 0; --i) {
                message.append('0');
            }
        }
    }

        protected double parseSecond(String buffer, int start, int end)
        throws NumberFormatException {
                int dot = -1;
                for (int i = start; i < end; i++) {
                        char ch = buffer.charAt(i);
                        if (ch == '.')
                                dot = i;
                        else if (ch > '9' || ch < '0')
                                throw new NumberFormatException("'" + buffer + "' has wrong format");
                }
                if (dot == -1) {
                        if (start+2 != end)
                                throw new NumberFormatException("'" + buffer + "' has wrong format");
                }
                else if (start+2 != dot || dot+1 == end) {
                        throw new NumberFormatException("'" + buffer + "' has wrong format");
                }
                return Double.parseDouble(buffer.substring(start, end));
        }

        //
        //Private help functions
        //

        private void cloneDate (DateTimeData finalValue, DateTimeData tempDate) {
                tempDate.year = finalValue.year;
                tempDate.month = finalValue.month;
                tempDate.day = finalValue.day;
                tempDate.hour = finalValue.hour;
                tempDate.minute = finalValue.minute;
                tempDate.second = finalValue.second;
                tempDate.utc = finalValue.utc;
                tempDate.timezoneHr = finalValue.timezoneHr;
                tempDate.timezoneMin = finalValue.timezoneMin;
        }

        /**
         * Represents date time data
         */
        static final class DateTimeData implements XSDateTime {
                int year, month, day, hour, minute, utc;
                double second;
                int timezoneHr, timezoneMin;
        private String originalValue;
        boolean normalized = true;

        int unNormYear;
        int unNormMonth;
        int unNormDay;
        int unNormHour;
        int unNormMinute;
        double unNormSecond;

                // used for comparisons - to decide the 'interesting' portions of
                // a date/time based data type.
                int position;
                // a pointer to the type that was used go generate this data
                // note that this is not the actual simple type, but one of the
                // statically created XXXDV objects, so this won't cause any GC problem.
                final AbstractDateTimeDV type;
                private String canonical;
                public DateTimeData(String originalValue, AbstractDateTimeDV type) {
            this.originalValue = originalValue;
                        this.type = type;
                }
                public DateTimeData(int year, int month, int day, int hour, int minute,
                                double second, int utc, String originalValue, boolean normalized, AbstractDateTimeDV type) {
                        this.year = year;
                        this.month = month;
                        this.day = day;
                        this.hour = hour;
                        this.minute = minute;
                        this.second = second;
                        this.utc = utc;
                        this.type = type;
            this.originalValue = originalValue;
                }
                public boolean equals(Object obj) {
                        if (!(obj instanceof DateTimeData))
                                return false;
                        return type.compareDates(this, (DateTimeData)obj, true)==0;
                }
                public synchronized String toString() {
                        if (canonical == null) {
                                canonical = type.dateToString(this);
                        }
                        return canonical;
                }
                /* (non-Javadoc)
                 * @see org.apache.xerces.xs.datatypes.XSDateTime#getYear()
                 */
                public int getYears() {
            if(type instanceof DurationDV)
                return 0;
                        return normalized?year:unNormYear;
                }
                /* (non-Javadoc)
                 * @see org.apache.xerces.xs.datatypes.XSDateTime#getMonth()
                 */
                public int getMonths() {
            if(type instanceof DurationDV) {
                return year*12 + month;
            }
                        return normalized?month:unNormMonth;
                }
                /* (non-Javadoc)
                 * @see org.apache.xerces.xs.datatypes.XSDateTime#getDay()
                 */
                public int getDays() {
            if(type instanceof DurationDV)
                return 0;
                        return normalized?day:unNormDay;
                }
                /* (non-Javadoc)
                 * @see org.apache.xerces.xs.datatypes.XSDateTime#getHour()
                 */
                public int getHours() {
            if(type instanceof DurationDV)
                return 0;
                        return normalized?hour:unNormHour;
                }
                /* (non-Javadoc)
                 * @see org.apache.xerces.xs.datatypes.XSDateTime#getMinutes()
                 */
                public int getMinutes() {
            if(type instanceof DurationDV)
                return 0;
                        return normalized?minute:unNormMinute;
                }
                /* (non-Javadoc)
                 * @see org.apache.xerces.xs.datatypes.XSDateTime#getSeconds()
                 */
                public double getSeconds() {
            if(type instanceof DurationDV) {
                return day*24*60*60 + hour*60*60 + minute*60 + second;
            }
                        return normalized?second:unNormSecond;
                }
                /* (non-Javadoc)
                 * @see org.apache.xerces.xs.datatypes.XSDateTime#hasTimeZone()
                 */
                public boolean hasTimeZone() {
                        return utc != 0;
                }
                /* (non-Javadoc)
                 * @see org.apache.xerces.xs.datatypes.XSDateTime#getTimeZoneHours()
                 */
                public int getTimeZoneHours() {
                        return timezoneHr;
                }
                /* (non-Javadoc)
                 * @see org.apache.xerces.xs.datatypes.XSDateTime#getTimeZoneMinutes()
                 */
                public int getTimeZoneMinutes() {
                        return timezoneMin;
                }
        /* (non-Javadoc)
         * @see org.apache.xerces.xs.datatypes.XSDateTime#getLexicalValue()
         */
        public String getLexicalValue() {
            return originalValue;
        }
        /* (non-Javadoc)
         * @see org.apache.xerces.xs.datatypes.XSDateTime#normalize()
         */
        public XSDateTime normalize() {
            if(!normalized) {
                DateTimeData dt = (DateTimeData)this.clone();
                dt.normalized = true;
                return dt;
            }
            return this;
        }
        /* (non-Javadoc)
         * @see org.apache.xerces.xs.datatypes.XSDateTime#isNormalized()
         */
        public boolean isNormalized() {
            return normalized;
        }

        public Object clone() {
            DateTimeData dt = new DateTimeData(this.year, this.month, this.day, this.hour,
                        this.minute, this.second, this.utc, this.originalValue, this.normalized, this.type);
            dt.canonical = this.canonical;
            dt.position = position;
            dt.timezoneHr = this.timezoneHr;
            dt.timezoneMin = this.timezoneMin;
            dt.unNormYear = this.unNormYear;
            dt.unNormMonth = this.unNormMonth;
            dt.unNormDay = this.unNormDay;
            dt.unNormHour = this.unNormHour;
            dt.unNormMinute = this.unNormMinute;
            dt.unNormSecond = this.unNormSecond;
            return dt;
        }

        /* (non-Javadoc)
         * @see org.apache.xerces.xs.datatypes.XSDateTime#getXMLGregorianCalendar()
         */
        public XMLGregorianCalendar getXMLGregorianCalendar() {
            return type.getXMLGregorianCalendar(this);
        }
        /* (non-Javadoc)
         * @see org.apache.xerces.xs.datatypes.XSDateTime#getDuration()
         */
        public Duration getDuration() {
            return type.getDuration(this);
        }
        }

    protected XMLGregorianCalendar getXMLGregorianCalendar(DateTimeData data) {
        return null;
    }

    protected Duration getDuration(DateTimeData data) {
        return null;
    }

    protected final BigDecimal getFractionalSecondsAsBigDecimal(DateTimeData data) {
        final StringBuffer buf = new StringBuffer();
        append3(buf, data.unNormSecond);
        String value = buf.toString();
        final int index = value.indexOf('.');
        if (index == -1) {
            return null;
        }
        value = value.substring(index);
        final BigDecimal _val = new BigDecimal(value);
        if (_val.compareTo(BigDecimal.valueOf(0)) == 0) {
            return null;
        }
        return _val;
    }
}
