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Posted to commits@xalan.apache.org by dl...@apache.org on 2002/06/05 18:14:43 UTC
cvs commit: xml-xalan/java/src/org/apache/xalan/lib ExsltDatetime.java
dleslie 2002/06/05 09:14:43
Added: java/src/org/apache/xalan/lib ExsltDatetime.java
Log:
Core EXSLT dates-and-times functions.
Revision Changes Path
1.1 xml-xalan/java/src/org/apache/xalan/lib/ExsltDatetime.java
Index: ExsltDatetime.java
===================================================================
/*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, Lotus
* Development Corporation., http://www.lotus.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.xalan.lib;
import java.util.Date;
import java.util.TimeZone;
import java.util.Calendar;
import java.text.SimpleDateFormat;
import java.text.DateFormat;
import java.text.ParseException;
import org.apache.xpath.objects.XString;
import org.apache.xpath.objects.XNumber;
import org.apache.xpath.objects.XBoolean;
import org.apache.xpath.objects.XObject;
/**
* <meta name="usage" content="general"/>
* This class contains EXSLT dates and times extension functions.
* It is accessed by specifying a namespace URI as follows:
* <pre>
* xmlns:math="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>
*/
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";
/**
* 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 XString 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 new XString(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 XString 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 new XString("");
String[] formatsIn = {dt, d};
String formatOut = d;
Date date = testFormats(datetime, formatsIn);
if (date == null) return new XString("");
SimpleDateFormat dateFormat = new SimpleDateFormat(formatOut);
dateFormat.setLenient(false);
String dateOut = dateFormat.format(date);
if (dateOut.length() == 0)
return new XString("");
else
return new XString(leader + dateOut + zone);
}
/**
* See above.
*/
public static XString date()
{
String datetime = dateTime().toString();
String date = datetime.substring(0, datetime.indexOf("T"));
String zone = datetime.substring(getZoneStart(datetime));
return new XString(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 XString time(String timeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(timeIn);
String time = edz[1];
String zone = edz[2];
if (time == null || zone == null)
return new XString("");
String[] formatsIn = {dt, d};
String formatOut = t;
Date date = testFormats(time, formatsIn);
if (date == null) return new XString("");
SimpleDateFormat dateFormat = new SimpleDateFormat(formatOut);
String out = dateFormat.format(date);
return new XString(out + zone);
}
/**
* See above.
*/
public static XString time()
{
String datetime = dateTime().toString();
String time = datetime.substring(datetime.indexOf("T")+1);
String zone = datetime.substring(getZoneStart(datetime));
return new XString(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 XNumber 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 new XNumber(Double.NaN);
String[] formats = {dt, d, gym, gy};
double yr = getNumber(datetime, formats, Calendar.YEAR);
if (ad || yr == Double.NaN)
return new XNumber(yr);
else
return new XNumber(-yr);
}
/**
* See above.
*/
public static XNumber year()
{
Calendar cal = Calendar.getInstance();
return new XNumber(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)
* If the date/time string is not in one of these formats, then NaN is returned.
*/
public static XNumber monthInYear(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};
return new XNumber(getNumber(datetime, formats, Calendar.MONTH));
}
/**
* See above.
*/
public static XNumber monthInYear()
{
Calendar cal = Calendar.getInstance();
return new XNumber(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 XNumber weekInYear(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XNumber(Double.NaN);
String[] formats = {dt, d};
return new XNumber(getNumber(datetime, formats, Calendar.WEEK_OF_YEAR));
}
/**
* See above.
*/
public static XNumber weekInYear()
{
Calendar cal = Calendar.getInstance();
return new XNumber(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 XNumber dayInYear(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XNumber(Double.NaN);
String[] formats = {dt, d};
return new XNumber(getNumber(datetime, formats, Calendar.DAY_OF_YEAR));
}
/**
* See above.
*/
public static XNumber dayInYear()
{
Calendar cal = Calendar.getInstance();
return new XNumber(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 XNumber 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 new XNumber(day);
}
/**
* See above.
*/
public static XNumber dayInMonth()
{
Calendar cal = Calendar.getInstance();
return new XNumber(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 XNumber dayOfWeekInMonth(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XNumber(Double.NaN);
String[] formats = {dt, d};
return new XNumber(getNumber(datetime, formats, Calendar.DAY_OF_WEEK_IN_MONTH));
}
/**
* See above.
*/
public static XNumber dayOfWeekInMonth()
{
Calendar cal = Calendar.getInstance();
return new XNumber(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 XNumber dayInWeek(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XNumber(Double.NaN);
String[] formats = {dt, d};
return new XNumber(getNumber(datetime, formats, Calendar.DAY_OF_WEEK));
}
/**
* See above.
*/
public static XNumber dayInWeek()
{
Calendar cal = Calendar.getInstance();
return new XNumber(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 XNumber hourInDay(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XNumber(Double.NaN);
String[] formats = {d, t};
return new XNumber(getNumber(datetime, formats, Calendar.HOUR_OF_DAY));
}
/**
* See above.
*/
public static XNumber hourInDay()
{
Calendar cal = Calendar.getInstance();
return new XNumber(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 XNumber minuteInHour(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XNumber(Double.NaN);
String[] formats = {dt,t};
return new XNumber(getNumber(datetime, formats, Calendar.MINUTE));
}
/**
* See above.
*/
public static XNumber minuteInHour()
{
Calendar cal = Calendar.getInstance();
return new XNumber(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 XNumber secondInMinute(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XNumber(Double.NaN);
String[] formats = {dt, t};
return new XNumber(getNumber(datetime, formats, Calendar.SECOND));
}
/**
* See above.
*/
public static XNumber secondInMinute()
{
Calendar cal = Calendar.getInstance();
return new XNumber(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;
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, yr);
cal.set(Calendar.MONTH, Calendar.FEBRUARY);
return new XBoolean(cal.getActualMaximum(cal.DAY_OF_MONTH)==29);
}
/**
* See above.
*/
public static XBoolean leapYear()
{
Calendar cal = Calendar.getInstance();
cal.set(Calendar.MONTH, Calendar.FEBRUARY);
return new XBoolean(cal.getActualMaximum(cal.DAY_OF_MONTH)==29);
}
/**
* 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 XString monthName(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XString("");
String[] formatsIn = {dt, d, gym, gm};
String formatOut = "MMMM";
return new XString (getNameOrAbbrev(datetimeIn, formatsIn, formatOut));
}
/**
* See above.
*/
public static XString monthName()
{
Calendar cal = Calendar.getInstance();
String format = "MMMM";
return new XString(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 XString monthAbbreviation(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XString("");
String[] formatsIn = {dt, d, gym, gm};
String formatOut = "MMM";
return new XString (getNameOrAbbrev(datetimeIn, formatsIn, formatOut));
}
/**
* See above.
*/
public static XString monthAbbreviation()
{
String format = "MMM";
return new XString(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 XString dayName(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XString("");
String[] formatsIn = {dt, d};
String formatOut = "EEEE";
return new XString (getNameOrAbbrev(datetimeIn, formatsIn, formatOut));
}
/**
* See above.
*/
public static XString dayName()
{
String format = "EEEE";
return new XString(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 XString dayAbbreviation(String datetimeIn)
throws ParseException
{
String[] edz = getEraDatetimeZone(datetimeIn);
String datetime = edz[1];
if (datetime == null)
return new XString("");
String[] formatsIn = {dt, d};
String formatOut = "EEE";
return new XString (getNameOrAbbrev(datetimeIn, formatsIn, formatOut));
}
/**
* See above.
*/
public static XString dayAbbreviation()
{
String format = "EEE";
return new XString(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)=='-')
{
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.indexOf("Z");
else if (
(datetime.lastIndexOf("-") == datetime.length()-6 &&
datetime.charAt(datetime.length()-3) == ':')
||
(datetime.indexOf("+") == 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. Input formats are passed in longest to shortest,
* so if any parse operation fails with a parse error in the string, can
* immediately return null.
*/
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)
{
if (pe.getErrorOffset() < in.length())
return null;
}
}
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)
{
// If ParseException occurred during input string, input is invalid.
// If the ParseException occurred at the end of the input string,
// another format may work.
if (pe.getErrorOffset() < in.length())
return "";
}
}
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());
}
}
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