- /*
- * Copyright 1999-2004 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.
- */
- /*
- * $Id: ExsltDatetime.java,v 1.13 2004/02/11 17:56:36 minchau Exp $
- */
-
- package com.sun.org.apache.xalan.internal.lib;
-
-
- import java.text.ParseException;
- import java.text.SimpleDateFormat;
- import java.util.Calendar;
- import java.util.Date;
- import java.util.TimeZone;
-
- import com.sun.org.apache.xpath.internal.objects.XBoolean;
- import com.sun.org.apache.xpath.internal.objects.XNumber;
- import com.sun.org.apache.xpath.internal.objects.XObject;
-
- /**
- * This class contains EXSLT dates and times extension functions.
- * It is accessed by specifying a namespace URI as follows:
- * <pre>
- * xmlns:datetime="http://exslt.org/dates-and-times"
- * </pre>
- *
- * The documentation for each function has been copied from the relevant
- * EXSLT Implementer page.
- *
- * @see <a href="http://www.exslt.org/">EXSLT</a>
- * @xsl.usage general
- */
-
- public class ExsltDatetime
- {
- // Datetime formats (era and zone handled separately).
- static final String dt = "yyyy-MM-dd'T'HH:mm:ss";
- static final String d = "yyyy-MM-dd";
- static final String gym = "yyyy-MM";
- static final String gy = "yyyy";
- static final String gmd = "--MM-dd";
- static final String gm = "--MM--";
- static final String gd = "---dd";
- static final String t = "HH:mm:ss";
- static final String EMPTY_STR = "";
-
- /**
- * The date:date-time function returns the current date and time as a date/time string.
- * The date/time string that's returned must be a string in the format defined as the
- * lexical representation of xs:dateTime in
- * <a href="http://www.w3.org/TR/xmlschema-2/#dateTime">[3.2.7 dateTime]</a> of
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The date/time format is basically CCYY-MM-DDThh:mm:ss, although implementers should consult
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a> and
- * <a href="http://www.iso.ch/markete/8601.pdf">[ISO 8601]</a> for details.
- * The date/time string format must include a time zone, either a Z to indicate Coordinated
- * Universal Time or a + or - followed by the difference between the difference from UTC
- * represented as hh:mm.
- */
- public static String dateTime()
- {
- Calendar cal = Calendar.getInstance();
- Date datetime = cal.getTime();
- // Format for date and time.
- SimpleDateFormat dateFormat = new SimpleDateFormat(dt);
-
- StringBuffer buff = new StringBuffer(dateFormat.format(datetime));
- // Must also include offset from UTF.
- // Get the offset (in milliseconds).
- int offset = cal.get(Calendar.ZONE_OFFSET) + cal.get(Calendar.DST_OFFSET);
- // If there is no offset, we have "Coordinated
- // Universal Time."
- if (offset == 0)
- buff.append("Z");
- else
- {
- // Convert milliseconds to hours and minutes
- int hrs = offset(60*60*1000);
- // In a few cases, the time zone may be +/-hh:30.
- int min = offset%(60*60*1000);
- char posneg = hrs < 0? '-': '+';
- buff.append(posneg + formatDigits(hrs) + ':' + formatDigits(min));
- }
- return buff.toString();
- }
-
- /**
- * Represent the hours and minutes with two-digit strings.
- * @param q hrs or minutes.
- * @return two-digit String representation of hrs or minutes.
- */
- private static String formatDigits(int q)
- {
- String dd = String.valueOf(Math.abs(q));
- return dd.length() == 1 ? '0' + dd : dd;
- }
-
- /**
- * The date:date function returns the date specified in the date/time string given
- * as the argument. If no argument is given, then the current local date/time, as
- * returned by date:date-time is used as a default argument.
- * The date/time string that's returned must be a string in the format defined as the
- * lexical representation of xs:dateTime in
- * <a href="http://www.w3.org/TR/xmlschema-2/#dateTime">[3.2.7 dateTime]</a> of
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * If the argument is not in either of these formats, date:date returns an empty string ('').
- * The date/time format is basically CCYY-MM-DDThh:mm:ss, although implementers should consult
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a> and
- * <a href="http://www.iso.ch/markete/8601.pdf">[ISO 8601]</a> for details.
- * The date is returned as a string with a lexical representation as defined for xs:date in
- * [3.2.9 date] of [XML Schema Part 2: Datatypes]. The date format is basically CCYY-MM-DD,
- * although implementers should consult [XML Schema Part 2: Datatypes] and [ISO 8601] for details.
- * If no argument is given or the argument date/time specifies a time zone, then the date string
- * format must include a time zone, either a Z to indicate Coordinated Universal Time or a + or -
- * followed by the difference between the difference from UTC represented as hh:mm. If an argument
- * is specified and it does not specify a time zone, then the date string format must not include
- * a time zone.
- */
- public static String date(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String leader = edz[0];
- String datetime = edz[1];
- String zone = edz[2];
- if (datetime == null || zone == null)
- return EMPTY_STR;
-
- String[] formatsIn = {dt, d};
- String formatOut = d;
- Date date = testFormats(datetime, formatsIn);
- if (date == null) return EMPTY_STR;
-
- SimpleDateFormat dateFormat = new SimpleDateFormat(formatOut);
- dateFormat.setLenient(false);
- String dateOut = dateFormat.format(date);
- if (dateOut.length() == 0)
- return EMPTY_STR;
- else
- return (leader + dateOut + zone);
- }
-
-
- /**
- * See above.
- */
- public static String date()
- {
- String datetime = dateTime().toString();
- String date = datetime.substring(0, datetime.indexOf("T"));
- String zone = datetime.substring(getZoneStart(datetime));
- return (date + zone);
- }
-
- /**
- * The date:time function returns the time specified in the date/time string given
- * as the argument. If no argument is given, then the current local date/time, as
- * returned by date:date-time is used as a default argument.
- * The date/time string that's returned must be a string in the format defined as the
- * lexical representation of xs:dateTime in
- * <a href="http://www.w3.org/TR/xmlschema-2/#dateTime">[3.2.7 dateTime]</a> of
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * If the argument string is not in this format, date:time returns an empty string ('').
- * The date/time format is basically CCYY-MM-DDThh:mm:ss, although implementers should consult
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a> and
- * <a href="http://www.iso.ch/markete/8601.pdf">[ISO 8601]</a> for details.
- * The date is returned as a string with a lexical representation as defined for xs:time in
- * <a href="http://www.w3.org/TR/xmlschema-2/#time">[3.2.8 time]</a> of [XML Schema Part 2: Datatypes].
- * The time format is basically hh:mm:ss, although implementers should consult [XML Schema Part 2:
- * Datatypes] and [ISO 8601] for details.
- * If no argument is given or the argument date/time specifies a time zone, then the time string
- * format must include a time zone, either a Z to indicate Coordinated Universal Time or a + or -
- * followed by the difference between the difference from UTC represented as hh:mm. If an argument
- * is specified and it does not specify a time zone, then the time string format must not include
- * a time zone.
- */
- public static String time(String timeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(timeIn);
- String time = edz[1];
- String zone = edz[2];
- if (time == null || zone == null)
- return EMPTY_STR;
-
- String[] formatsIn = {dt, d};
- String formatOut = t;
- Date date = testFormats(time, formatsIn);
- if (date == null) return EMPTY_STR;
- SimpleDateFormat dateFormat = new SimpleDateFormat(formatOut);
- String out = dateFormat.format(date);
- return (out + zone);
- }
-
- /**
- * See above.
- */
- public static String time()
- {
- String datetime = dateTime().toString();
- String time = datetime.substring(datetime.indexOf("T")+1);
- String zone = datetime.substring(getZoneStart(datetime));
- return (time + zone);
- }
-
- /**
- * The date:year function returns the year of a date as a number. If no
- * argument is given, then the current local date/time, as returned by
- * date:date-time is used as a default argument.
- * The date/time string specified as the first argument must be a right-truncated
- * string in the format defined as the lexical representation of xs:dateTime in one
- * of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * xs:gYearMonth (CCYY-MM)
- * xs:gYear (CCYY)
- * If the date/time string is not in one of these formats, then NaN is returned.
- */
- public static double year(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- boolean ad = edz[0].length() == 0; // AD (Common Era -- empty leader)
- String datetime = edz[1];
- if (datetime == null)
- return Double.NaN;
-
- String[] formats = {dt, d, gym, gy};
- double yr = getNumber(datetime, formats, Calendar.YEAR);
- if (ad || yr == Double.NaN)
- return yr;
- else
- return -yr;
- }
-
- /**
- * See above.
- */
- public static double year()
- {
- Calendar cal = Calendar.getInstance();
- return cal.get(Calendar.YEAR);
- }
-
- /**
- * The date:year function returns the month of a date as a number. If no argument
- * is given, then the current local date/time, as returned by date:date-time is used
- * as a default argument.
- * The date/time string specified as the first argument is a left or right-truncated
- * string in the format defined as the lexical representation of xs:dateTime in one of
- * the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * xs:gYearMonth (CCYY-MM)
- * xs:gMonth (--MM--)
- * xs:gMonthDay (--MM-DD)
- * If the date/time string is not in one of these formats, then NaN is returned.
- */
- public static double monthInYear(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return Double.NaN;
-
- String[] formats = {dt, d, gym, gm, gmd};
- return getNumber(datetime, formats, Calendar.MONTH);
- }
-
- /**
- * See above.
- */
- public static double monthInYear()
- {
- Calendar cal = Calendar.getInstance();
- return cal.get(Calendar.MONTH);
- }
-
- /**
- * The date:week-in-year function returns the week of the year as a number. If no argument
- * is given, then the current local date/time, as returned by date:date-time is used as the
- * default argument. For the purposes of numbering, counting follows ISO 8601: week 1 in a year
- * is the week containing the first Thursday of the year, with new weeks beginning on a Monday.
- * The date/time string specified as the argument is a right-truncated string in the format
- * defined as the lexical representation of xs:dateTime in one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>. The
- * permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * If the date/time string is not in one of these formats, then NaN is returned.
- */
- public static double weekInYear(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return Double.NaN;
-
- String[] formats = {dt, d};
- return getNumber(datetime, formats, Calendar.WEEK_OF_YEAR);
- }
-
- /**
- * See above.
- */
- public static double weekInYear()
- {
- Calendar cal = Calendar.getInstance();
- return cal.get(Calendar.WEEK_OF_YEAR);
- }
-
- /**
- * The date:day-in-year function returns the day of a date in a year
- * as a number. If no argument is given, then the current local
- * date/time, as returned by date:date-time is used the default argument.
- * The date/time string specified as the argument is a right-truncated
- * string in the format defined as the lexical representation of xs:dateTime
- * in one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * If the date/time string is not in one of these formats, then NaN is returned.
- */
- public static double dayInYear(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return Double.NaN;
-
- String[] formats = {dt, d};
- return getNumber(datetime, formats, Calendar.DAY_OF_YEAR);
- }
-
- /**
- * See above.
- */
- public static double dayInYear()
- {
- Calendar cal = Calendar.getInstance();
- return cal.get(Calendar.DAY_OF_YEAR);
- }
-
-
- /**
- * The date:day-in-month function returns the day of a date as a number.
- * If no argument is given, then the current local date/time, as returned
- * by date:date-time is used the default argument.
- * The date/time string specified as the argument is a left or right-truncated
- * string in the format defined as the lexical representation of xs:dateTime
- * in one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * xs:gMonthDay (--MM-DD)
- * xs:gDay (---DD)
- * If the date/time string is not in one of these formats, then NaN is returned.
- */
- public static double dayInMonth(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- String[] formats = {dt, d, gmd, gd};
- double day = getNumber(datetime, formats, Calendar.DAY_OF_MONTH);
- return day;
- }
-
- /**
- * See above.
- */
- public static double dayInMonth()
- {
- Calendar cal = Calendar.getInstance();
- return cal.get(Calendar.DAY_OF_MONTH);
- }
-
- /**
- * The date:day-of-week-in-month function returns the day-of-the-week
- * in a month of a date as a number (e.g. 3 for the 3rd Tuesday in May).
- * If no argument is given, then the current local date/time, as returned
- * by date:date-time is used the default argument.
- * The date/time string specified as the argument is a right-truncated string
- * in the format defined as the lexical representation of xs:dateTime in one
- * of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * If the date/time string is not in one of these formats, then NaN is returned.
- */
- public static double dayOfWeekInMonth(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return Double.NaN;
-
- String[] formats = {dt, d};
- return getNumber(datetime, formats, Calendar.DAY_OF_WEEK_IN_MONTH);
- }
-
- /**
- * See above.
- */
- public static double dayOfWeekInMonth()
- {
- Calendar cal = Calendar.getInstance();
- return cal.get(Calendar.DAY_OF_WEEK_IN_MONTH);
- }
-
-
- /**
- * The date:day-in-week function returns the day of the week given in a
- * date as a number. If no argument is given, then the current local date/time,
- * as returned by date:date-time is used the default argument.
- * The date/time string specified as the argument is a right-truncated string
- * in the format defined as the lexical representation of xs:dateTime in one
- * of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * If the date/time string is not in one of these formats, then NaN is returned.
- The numbering of days of the week starts at 1 for Sunday, 2 for Monday and so on up to 7 for Saturday.
- */
- public static double dayInWeek(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return Double.NaN;
-
- String[] formats = {dt, d};
- return getNumber(datetime, formats, Calendar.DAY_OF_WEEK);
- }
-
- /**
- * See above.
- */
- public static double dayInWeek()
- {
- Calendar cal = Calendar.getInstance();
- return cal.get(Calendar.DAY_OF_WEEK);
- }
-
- /**
- * The date:hour-in-day function returns the hour of the day as a number.
- * If no argument is given, then the current local date/time, as returned
- * by date:date-time is used the default argument.
- * The date/time string specified as the argument is a right-truncated
- * string in the format defined as the lexical representation of xs:dateTime
- * in one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:time (hh:mm:ss)
- * If the date/time string is not in one of these formats, then NaN is returned.
- */
- public static double hourInDay(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return Double.NaN;
-
- String[] formats = {dt, t};
- return getNumber(datetime, formats, Calendar.HOUR_OF_DAY);
- }
-
- /**
- * See above.
- */
- public static double hourInDay()
- {
- Calendar cal = Calendar.getInstance();
- return cal.get(Calendar.HOUR_OF_DAY);
- }
-
- /**
- * The date:minute-in-hour function returns the minute of the hour
- * as a number. If no argument is given, then the current local
- * date/time, as returned by date:date-time is used the default argument.
- * The date/time string specified as the argument is a right-truncated
- * string in the format defined as the lexical representation of xs:dateTime
- * in one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:time (hh:mm:ss)
- * If the date/time string is not in one of these formats, then NaN is returned.
- */
- public static double minuteInHour(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return Double.NaN;
-
- String[] formats = {dt,t};
- return getNumber(datetime, formats, Calendar.MINUTE);
- }
-
- /**
- * See above.
- */
- public static double minuteInHour()
- {
- Calendar cal = Calendar.getInstance();
- return cal.get(Calendar.MINUTE);
- }
-
- /**
- * The date:second-in-minute function returns the second of the minute
- * as a number. If no argument is given, then the current local
- * date/time, as returned by date:date-time is used the default argument.
- * The date/time string specified as the argument is a right-truncated
- * string in the format defined as the lexical representation of xs:dateTime
- * in one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:time (hh:mm:ss)
- * If the date/time string is not in one of these formats, then NaN is returned.
- */
- public static double secondInMinute(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return Double.NaN;
-
- String[] formats = {dt, t};
- return getNumber(datetime, formats, Calendar.SECOND);
- }
-
- /**
- * See above.
- */
- public static double secondInMinute()
- {
- Calendar cal = Calendar.getInstance();
- return cal.get(Calendar.SECOND);
- }
-
- /**
- * The date:leap-year function returns true if the year given in a date
- * is a leap year. If no argument is given, then the current local
- * date/time, as returned by date:date-time is used as a default argument.
- * The date/time string specified as the first argument must be a
- * right-truncated string in the format defined as the lexical representation
- * of xs:dateTime in one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * xs:gYearMonth (CCYY-MM)
- * xs:gYear (CCYY)
- * If the date/time string is not in one of these formats, then NaN is returned.
- */
- public static XObject leapYear(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return new XNumber(Double.NaN);
-
- String[] formats = {dt, d, gym, gy};
- double dbl = getNumber(datetime, formats, Calendar.YEAR);
- if (dbl == Double.NaN)
- return new XNumber(Double.NaN);
- int yr = (int)dbl;
- return new XBoolean(yr % 400 == 0 || (yr % 100 != 0 && yr % 4 == 0));
- }
-
- /**
- * See above.
- */
- public static boolean leapYear()
- {
- Calendar cal = Calendar.getInstance();
- int yr = (int)cal.get(Calendar.YEAR);
- return (yr % 400 == 0 || (yr % 100 != 0 && yr % 4 == 0));
- }
-
- /**
- * The date:month-name function returns the full name of the month of a date.
- * If no argument is given, then the current local date/time, as returned by
- * date:date-time is used the default argument.
- * The date/time string specified as the argument is a left or right-truncated
- * string in the format defined as the lexical representation of xs:dateTime in
- * one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * xs:gYearMonth (CCYY-MM)
- * xs:gMonth (--MM--)
- * If the date/time string is not in one of these formats, then an empty string ('')
- * is returned.
- * The result is an English month name: one of 'January', 'February', 'March',
- * 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November'
- * or 'December'.
- */
- public static String monthName(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return EMPTY_STR;
-
- String[] formatsIn = {dt, d, gym, gm};
- String formatOut = "MMMM";
- return getNameOrAbbrev(datetimeIn, formatsIn, formatOut);
- }
-
- /**
- * See above.
- */
- public static String monthName()
- {
- Calendar cal = Calendar.getInstance();
- String format = "MMMM";
- return getNameOrAbbrev(format);
- }
-
- /**
- * The date:month-abbreviation function returns the abbreviation of the month of
- * a date. If no argument is given, then the current local date/time, as returned
- * by date:date-time is used the default argument.
- * The date/time string specified as the argument is a left or right-truncated
- * string in the format defined as the lexical representation of xs:dateTime in
- * one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * xs:gYearMonth (CCYY-MM)
- * xs:gMonth (--MM--)
- * If the date/time string is not in one of these formats, then an empty string ('')
- * is returned.
- * The result is a three-letter English month abbreviation: one of 'Jan', 'Feb', 'Mar',
- * 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov' or 'Dec'.
- * An implementation of this extension function in the EXSLT date namespace must conform
- * to the behaviour described in this document.
- */
- public static String monthAbbreviation(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return EMPTY_STR;
-
- String[] formatsIn = {dt, d, gym, gm};
- String formatOut = "MMM";
- return getNameOrAbbrev(datetimeIn, formatsIn, formatOut);
- }
-
- /**
- * See above.
- */
- public static String monthAbbreviation()
- {
- String format = "MMM";
- return getNameOrAbbrev(format);
- }
-
- /**
- * The date:day-name function returns the full name of the day of the week
- * of a date. If no argument is given, then the current local date/time,
- * as returned by date:date-time is used the default argument.
- * The date/time string specified as the argument is a left or right-truncated
- * string in the format defined as the lexical representation of xs:dateTime
- * in one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * If the date/time string is not in one of these formats, then the empty string ('')
- * is returned.
- * The result is an English day name: one of 'Sunday', 'Monday', 'Tuesday', 'Wednesday',
- * 'Thursday' or 'Friday'.
- * An implementation of this extension function in the EXSLT date namespace must conform
- * to the behaviour described in this document.
- */
- public static String dayName(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return EMPTY_STR;
-
- String[] formatsIn = {dt, d};
- String formatOut = "EEEE";
- return getNameOrAbbrev(datetimeIn, formatsIn, formatOut);
- }
-
- /**
- * See above.
- */
- public static String dayName()
- {
- String format = "EEEE";
- return getNameOrAbbrev(format);
- }
-
- /**
- * The date:day-abbreviation function returns the abbreviation of the day
- * of the week of a date. If no argument is given, then the current local
- * date/time, as returned by date:date-time is used the default argument.
- * The date/time string specified as the argument is a left or right-truncated
- * string in the format defined as the lexical representation of xs:dateTime
- * in one of the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * xs:date (CCYY-MM-DD)
- * If the date/time string is not in one of these formats, then the empty string
- * ('') is returned.
- * The result is a three-letter English day abbreviation: one of 'Sun', 'Mon', 'Tue',
- * 'Wed', 'Thu' or 'Fri'.
- * An implementation of this extension function in the EXSLT date namespace must conform
- * to the behaviour described in this document.
- */
- public static String dayAbbreviation(String datetimeIn)
- throws ParseException
- {
- String[] edz = getEraDatetimeZone(datetimeIn);
- String datetime = edz[1];
- if (datetime == null)
- return EMPTY_STR;
-
- String[] formatsIn = {dt, d};
- String formatOut = "EEE";
- return getNameOrAbbrev(datetimeIn, formatsIn, formatOut);
- }
-
- /**
- * See above.
- */
- public static String dayAbbreviation()
- {
- String format = "EEE";
- return getNameOrAbbrev(format);
- }
-
- /**
- * Returns an array with the 3 components that a datetime input string
- * may contain: - (for BC era), datetime, and zone. If the zone is not
- * valid, return null for that component.
- */
- private static String[] getEraDatetimeZone(String in)
- {
- String leader = "";
- String datetime = in;
- String zone = "";
- if (in.charAt(0)=='-' && !in.startsWith("--"))
- {
- leader = "-"; // '+' is implicit , not allowed
- datetime = in.substring(1);
- }
- int z = getZoneStart(datetime);
- if (z > 0)
- {
- zone = datetime.substring(z);
- datetime = datetime.substring(0, z);
- }
- else if (z == -2)
- zone = null;
- //System.out.println("'" + leader + "' " + datetime + " " + zone);
- return new String[]{leader, datetime, zone};
- }
-
- /**
- * Get the start of zone information if the input ends
- * with 'Z' or +/-hh:mm. If a zone string is not
- * found, return -1; if the zone string is invalid,
- * return -2.
- */
- private static int getZoneStart (String datetime)
- {
- if (datetime.indexOf("Z") == datetime.length()-1)
- return datetime.length()-1;
- else if (datetime.length() >=6
- && datetime.charAt(datetime.length()-3) == ':'
- && (datetime.charAt(datetime.length()-6) == '+'
- || datetime.charAt(datetime.length()-6) == '-'))
- {
- try
- {
- SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm");
- dateFormat.setLenient(false);
- Date d = dateFormat.parse(datetime.substring(datetime.length() -5));
- return datetime.length()-6;
- }
- catch (ParseException pe)
- {
- System.out.println("ParseException " + pe.getErrorOffset());
- return -2; // Invalid.
- }
-
- }
- return -1; // No zone information.
- }
-
- /**
- * Attempt to parse an input string with the allowed formats, returning
- * null if none of the formats work.
- */
- private static Date testFormats (String in, String[] formats)
- throws ParseException
- {
- for (int i = 0; i <formats.length; i++)
- {
- try
- {
- SimpleDateFormat dateFormat = new SimpleDateFormat(formats[i]);
- dateFormat.setLenient(false);
- return dateFormat.parse(in);
- }
- catch (ParseException pe)
- {
- }
- }
- return null;
- }
-
-
- /**
- * Parse the input string and return the corresponding calendar field
- * number.
- */
- private static double getNumber(String in, String[] formats, int calField)
- throws ParseException
- {
- Calendar cal = Calendar.getInstance();
- cal.setLenient(false);
- // Try the allowed formats, from longest to shortest.
- Date date = testFormats(in, formats);
- if (date == null) return Double.NaN;
- cal.setTime(date);
- return cal.get(calField);
- }
-
- /**
- * Get the full name or abbreviation of the month or day.
- */
- private static String getNameOrAbbrev(String in,
- String[] formatsIn,
- String formatOut)
- throws ParseException
- {
- for (int i = 0; i <formatsIn.length; i++) // from longest to shortest.
- {
- try
- {
- SimpleDateFormat dateFormat = new SimpleDateFormat(formatsIn[i]);
- dateFormat.setLenient(false);
- Date dt = dateFormat.parse(in);
- dateFormat.applyPattern(formatOut);
- return dateFormat.format(dt);
- }
- catch (ParseException pe)
- {
- }
- }
- return "";
- }
- /**
- * Get the full name or abbreviation for the current month or day
- * (no input string).
- */
- private static String getNameOrAbbrev(String format)
- {
- Calendar cal = Calendar.getInstance();
- SimpleDateFormat dateFormat = new SimpleDateFormat(format);
- return dateFormat.format(cal.getTime());
- }
-
- /**
- * The date:format-date function formats a date/time according to a pattern.
- * <p>
- * The first argument to date:format-date specifies the date/time to be
- * formatted. It must be right or left-truncated date/time strings in one of
- * the formats defined in
- * <a href="http://www.w3.org/TR/xmlschema-2/">[XML Schema Part 2: Datatypes]</a>.
- * The permitted formats are as follows:
- * <ul>
- * <li>xs:dateTime (CCYY-MM-DDThh:mm:ss)
- * <li>xs:date (CCYY-MM-DD)
- * <li>xs:time (hh:mm:ss)
- * <li>xs:gYearMonth (CCYY-MM)
- * <li>xs:gYear (CCYY)
- * <li>xs:gMonthDay (--MM-DD)
- * <li>xs:gMonth (--MM--)
- * <li>xs:gDay (---DD)
- * </ul>
- * The second argument is a string that gives the format pattern used to
- * format the date. The format pattern must be in the syntax specified by
- * the JDK 1.1 SimpleDateFormat class. The format pattern string is
- * interpreted as described for the JDK 1.1 SimpleDateFormat class.
- * <p>
- * If the date/time format is right-truncated (i.e. in a format other than
- * xs:time, or xs:dateTime) then any missing components are assumed to be as
- * follows: if no month is specified, it is given a month of 01; if no day
- * is specified, it is given a day of 01; if no time is specified, it is
- * given a time of 00:00:00.
- * <p>
- * If the date/time format is left-truncated (i.e. xs:time, xs:gMonthDay,
- * xs:gMonth or xs:gDay) and the format pattern has a token that uses a
- * component that is missing from the date/time format used, then that token
- * is replaced with an empty string ('') within the result.
- *
- * The author is Helg Bredow (helg.bredow@kalido.com)
- */
- public static String formatDate(String dateTime, String pattern)
- {
- final String yearSymbols = "Gy";
- final String monthSymbols = "M";
- final String daySymbols = "dDEFwW";
- TimeZone timeZone;
- String zone;
-
- // Get the timezone information if it was supplied and modify the
- // dateTime so that SimpleDateFormat will understand it.
- if (dateTime.endsWith("Z") || dateTime.endsWith("z"))
- {
- timeZone = TimeZone.getTimeZone("GMT");
- dateTime = dateTime.substring(0, dateTime.length()-1) + "GMT";
- zone = "z";
- }
- else if ((dateTime.length() >= 6)
- && (dateTime.charAt(dateTime.length()-3) == ':')
- && ((dateTime.charAt(dateTime.length()-6) == '+')
- || (dateTime.charAt(dateTime.length()-6) == '-')))
- {
- String offset = dateTime.substring(dateTime.length()-6);
-
- if ("+00:00".equals(offset) || "-00:00".equals(offset))
- {
- timeZone = TimeZone.getTimeZone("GMT");
- }
- else
- {
- timeZone = TimeZone.getTimeZone("GMT" + offset);
- }
- zone = "z";
- // Need to adjust it since SimpleDateFormat requires GMT+hh:mm but
- // we have +hh:mm.
- dateTime = dateTime.substring(0, dateTime.length()-6) + "GMT" + offset;
- }
- else
- {
- // Assume local time.
- timeZone = TimeZone.getDefault();
- zone = "";
- // Leave off the timezone since SimpleDateFormat will assume local
- // time if time zone is not included.
- }
- String[] formats = {dt + zone, d, gym, gy};
-
- // Try the time format first. We need to do this to prevent
- // SimpleDateFormat from interpreting a time as a year. i.e we just need
- // to check if it's a time before we check it's a year.
- try
- {
- SimpleDateFormat inFormat = new SimpleDateFormat(t + zone);
- inFormat.setLenient(false);
- Date d= inFormat.parse(dateTime);
- SimpleDateFormat outFormat = new SimpleDateFormat(strip
- (yearSymbols + monthSymbols + daySymbols, pattern));
- outFormat.setTimeZone(timeZone);
- return outFormat.format(d);
- }
- catch (ParseException pe)
- {
- }
-
- // Try the right truncated formats.
- for (int i = 0; i < formats.length; i++)
- {
- try
- {
- SimpleDateFormat inFormat = new SimpleDateFormat(formats[i]);
- inFormat.setLenient(false);
- Date d = inFormat.parse(dateTime);
- SimpleDateFormat outFormat = new SimpleDateFormat(pattern);
- outFormat.setTimeZone(timeZone);
- return outFormat.format(d);
- }
- catch (ParseException pe)
- {
- }
- }
-
- // Now try the left truncated ones. The Java format() function doesn't
- // return the correct strings in this case. We strip any pattern
- // symbols that shouldn't be output so that they are not defaulted to
- // inappropriate values in the output.
- try
- {
- SimpleDateFormat inFormat = new SimpleDateFormat(gmd);
- inFormat.setLenient(false);
- Date d = inFormat.parse(dateTime);
- SimpleDateFormat outFormat = new SimpleDateFormat(strip(yearSymbols, pattern));
- outFormat.setTimeZone(timeZone);
- return outFormat.format(d);
- }
- catch (ParseException pe)
- {
- }
- try
- {
- SimpleDateFormat inFormat = new SimpleDateFormat(gm);
- inFormat.setLenient(false);
- Date d = inFormat.parse(dateTime);
- SimpleDateFormat outFormat = new SimpleDateFormat(strip(yearSymbols, pattern));
- outFormat.setTimeZone(timeZone);
- return outFormat.format(d);
- }
- catch (ParseException pe)
- {
- }
- try
- {
- SimpleDateFormat inFormat = new SimpleDateFormat(gd);
- inFormat.setLenient(false);
- Date d = inFormat.parse(dateTime);
- SimpleDateFormat outFormat = new SimpleDateFormat(strip(yearSymbols + monthSymbols, pattern));
- outFormat.setTimeZone(timeZone);
- return outFormat.format(d);
- }
- catch (ParseException pe)
- {
- }
- return EMPTY_STR;
- }
-
- /**
- * Strips occurrences of the given character from a date format pattern.
- * @param symbols list of symbols to strip.
- * @param pattern
- * @return
- */
- private static String strip(String symbols, String pattern)
- {
- int quoteSemaphore = 0;
- int i = 0;
- StringBuffer result = new StringBuffer(pattern.length());
-
- while (i < pattern.length())
- {
- char ch = pattern.charAt(i);
- if (ch == '\'')
- {
- // Assume it's an openening quote so simply copy the quoted
- // text to the result. There is nothing to strip here.
- int endQuote = pattern.indexOf('\'', i + 1);
- if (endQuote == -1)
- {
- endQuote = pattern.length();
- }
- result.append(pattern.substring(i, endQuote));
- i = endQuote++;
- }
- else if (symbols.indexOf(ch) > -1)
- {
- // The char needs to be stripped.
- i++;
- }
- else
- {
- result.append(ch);
- i++;
- }
- }
- return result.toString();
- }
-
- }