org.apache.xmlbeans
Class GDate

java.lang.Object
  org.apache.xmlbeans.GDate

All Implemented Interfaces:

Serializable, GDateSpecification

public final class GDate
extends Object
implements GDateSpecification, Serializable

Represents an XML Schema-compatible Gregorian date.

There are many date types in XML Schema, and this type represents the natural union of all those types. A GDate can hold any subset of date fields (Year, Month, Day, Time, Timezone, or some combination). Wherever the specification provides guidance, the guidelines in the XML Schema 1.0 specification (plus published errata) are followed.

Instances may separately have values or no values for the year, month, day-of-month, and time-of-day. Not all operations are meaningful on all combinations.

See Also:

Serialized Form

Field Summary

Fields inherited from interface org.apache.xmlbeans.GDateSpecification

HAS_DAY, HAS_MONTH, HAS_TIME, HAS_TIMEZONE, HAS_YEAR

Constructor Summary

GDate(Calendar calendar)
Constructs a GDate based on a java.util.Calendar.

GDate(CharSequence string)
Constructs a GDate based on a lexical representation.

GDate(Date date)
Constructs a GDate based on a java.util.Date.

GDate(GDateSpecification gdate)
Constructs a GDate based on another GDateSpecification.

GDate(int year, int month, int day, int hour, int minute, int second, BigDecimal fraction)
Constructs a GDate with the specified year, month, day, hours, minutes, seconds, and optional fractional seconds, in an unspecified timezone.

GDate(int year, int month, int day, int hour, int minute, int second, BigDecimal fraction, int tzSign, int tzHour, int tzMinute)
Constructs an absolute GDate with the specified year, month, day, hours, minutes, seconds, and optional fractional seconds, and in the timezone specified.

Method Summary

GDate	add(GDurationSpecification duration) Adds a duration to this GDate, and returns a new GDate.
String	canonicalString() The canonical string representation.
int	compareToGDate(GDateSpecification datespec) Comparison to another GDate.
boolean	equals(Object obj) GDate is an immutable class, and equality is computed based on its canonical value.
int	getBuiltinTypeCode() Returns the builtin type code for the shape of the information contained in this instance, or 0 if the instance doesn't contain information corresponding to a Schema type.
XmlCalendar	getCalendar() Retrieves the value of the current time as an XmlCalendar.
Date	getDate() Retrieves the value of the current time as a java.util.Date instance.
int	getDay() Gets the day-of-month.
int	getFlags() Returns a combination of flags indicating the information contained by this GDate.
BigDecimal	getFraction() Gets the fraction-of-second.
int	getHour() Gets the hour-of-day.
int	getJulianDate() Returns the Julian date corresponding to this Gregorian date.
int	getMillisecond() Gets the rounded millisecond value.
int	getMinute() Gets the minute-of-hour.
int	getMonth() Gets the month-of-year.
int	getSecond() Gets the second-of-minute.
int	getTimeZoneHour() Gets the time zone hour.
int	getTimeZoneMinute() Gets the time zone minutes.
int	getTimeZoneSign() Gets the time zone sign.
int	getYear() Gets the year.
boolean	hasDate() True if this date/time specification specifies a full date (year, month, day)
boolean	hasDay() True if this date/time specification specifies a day-of-month.
int	hashCode() Returns a hash code for this GDate.
boolean	hasMonth() True if this date/time specification specifies a month-of-year.
boolean	hasTime() True if this date/time specification specifies a time-of-day.
boolean	hasTimeZone() True if this date/time specification specifies a timezone.
boolean	hasYear() True if this date/time specification specifies a year.
boolean	isImmutable() Returns true: all GDate instances are immutable.
boolean	isValid() True if this GDate corresponds to a valid gregorian date value in XML schema.
GDate	subtract(GDurationSpecification duration) Adds a duration to this GDate, and returns a new GDate.
String	toString() The natural string representation.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

GDate

public GDate(CharSequence string)

Constructs a GDate based on a lexical representation.

GDate

public GDate(int year,
             int month,
             int day,
             int hour,
             int minute,
             int second,
             BigDecimal fraction)

Constructs a GDate with the specified year, month, day, hours, minutes, seconds, and optional fractional seconds, in an unspecified timezone.

Note that by not specifying the timezone the GDate becomes partially unordered with respect to times that do have a specified timezone.

GDate

public GDate(int year,
             int month,
             int day,
             int hour,
             int minute,
             int second,
             BigDecimal fraction,
             int tzSign,
             int tzHour,
             int tzMinute)

Constructs an absolute GDate with the specified year, month, day, hours, minutes, seconds, and optional fractional seconds, and in the timezone specified.

If you wish to have a time or date that isn't in a specified timezone, then use the constructor that does not include the timezone arguments.

GDate

public GDate(Date date)

Constructs a GDate based on a java.util.Date.

The current offset of the default timezone is used as the timezone.

For example, if eastern daylight time is in effect at the given date, the timezone on the east coast of the united states translates to GMT-05:00 (EST) + 1:00 (DT offset) == GMT-04:00.

GDate

public GDate(Calendar calendar)

Constructs a GDate based on a java.util.Calendar.

If the calendar does not have some fields set, the same absence of information is reflected in the GDate. Note that java.util.GregorianCalendar fills in all fields as soon as any are fetched, so constructing a GDate with the same calendar object twice may result in a different GDate because of a changed calendar. Note that org.apache.xmlbeans.XmlCalendar is stable if you re-get a set field, so it does not have the same problem.

GDate

public GDate(GDateSpecification gdate)

Constructs a GDate based on another GDateSpecification.

Method Detail

isImmutable

public final boolean isImmutable()

Returns true: all GDate instances are immutable.

Specified by:

isImmutable in interface GDateSpecification

getFlags

public int getFlags()

Returns a combination of flags indicating the information contained by this GDate. The five flags are HAS_TIMEZONE, HAS_YEAR, HAS_MONTH, HAS_DAY, and HAS_TIME.

Specified by:

getFlags in interface GDateSpecification

hasTimeZone

public final boolean hasTimeZone()

True if this date/time specification specifies a timezone.

Specified by:

hasTimeZone in interface GDateSpecification

hasYear

public final boolean hasYear()

True if this date/time specification specifies a year.

Specified by:

hasYear in interface GDateSpecification

hasMonth

public final boolean hasMonth()

True if this date/time specification specifies a month-of-year.

Specified by:

hasMonth in interface GDateSpecification

hasDay

public final boolean hasDay()

True if this date/time specification specifies a day-of-month.

Specified by:

hasDay in interface GDateSpecification

hasTime

public final boolean hasTime()

True if this date/time specification specifies a time-of-day.

Specified by:

hasTime in interface GDateSpecification

hasDate

public final boolean hasDate()

True if this date/time specification specifies a full date (year, month, day)

Specified by:

hasDate in interface GDateSpecification

getYear

public final int getYear()

Gets the year. Should be a four-digit year specification.

Specified by:

getYear in interface GDateSpecification

getMonth

public final int getMonth()

Gets the month-of-year. January is 1.

Specified by:

getMonth in interface GDateSpecification

getDay

public final int getDay()

Gets the day-of-month. The first day of each month is 1.

Specified by:

getDay in interface GDateSpecification

getHour

public final int getHour()

Gets the hour-of-day. Midnight is 0, and 11PM is 23.

Specified by:

getHour in interface GDateSpecification

getMinute

public final int getMinute()

Gets the minute-of-hour. Range from 0 to 59.

Specified by:

getMinute in interface GDateSpecification

getSecond

public final int getSecond()

Gets the second-of-minute. Range from 0 to 59.

Specified by:

getSecond in interface GDateSpecification

getFraction

public final BigDecimal getFraction()

Gets the fraction-of-second. Range from 0 (inclusive) to 1 (exclusive).

Specified by:

getFraction in interface GDateSpecification

getTimeZoneSign

public final int getTimeZoneSign()

Gets the time zone sign. For time zones east of GMT, this is positive; for time zones west, this is negative.

Specified by:

getTimeZoneSign in interface GDateSpecification

getTimeZoneHour

public final int getTimeZoneHour()

Gets the time zone hour. This is always positive: for the sign, look at getTimeZoneSign().

Specified by:

getTimeZoneHour in interface GDateSpecification

getTimeZoneMinute

public final int getTimeZoneMinute()

Gets the time zone minutes. This is always positive: for the sign, look at getTimeZoneSign().

Specified by:

getTimeZoneMinute in interface GDateSpecification

getMillisecond

public int getMillisecond()

Gets the rounded millisecond value. Range from 0 to 999

Specified by:

getMillisecond in interface GDateSpecification

canonicalString

public String canonicalString()

The canonical string representation. Specific moments or times-of-day in a specified timezone are normalized to UTC time to produce a canonical string form for them. Other recurring time specifications keep their timezone information.

Specified by:

canonicalString in interface GDateSpecification

isValid

public boolean isValid()

True if this GDate corresponds to a valid gregorian date value in XML schema.

Specified by:

isValid in interface GDateSpecification

getJulianDate

public int getJulianDate()

Returns the Julian date corresponding to this Gregorian date. The Julian date (JD) is a continuous count of days from 1 January 4713 BC (= -4712 January 1).

Specified by:

getJulianDate in interface GDateSpecification

getCalendar

public XmlCalendar getCalendar()

Retrieves the value of the current time as an XmlCalendar.

XmlCalendar is a subclass of GregorianCalendar which is slightly customized to match XML schema date rules.

The returned XmlCalendar has only those time and date fields set that are reflected in the GDate object. Because of the way the Calendar contract works, any information in the isSet() vanishes as soon as you view any unset field using get() methods. This means that if it is important to understand which date fields are set, you must call isSet() first before get().

Specified by:

getCalendar in interface GDateSpecification

getDate

public Date getDate()

Retrieves the value of the current time as a java.util.Date instance.

Specified by:

getDate in interface GDateSpecification

compareToGDate

public int compareToGDate(GDateSpecification datespec)

Comparison to another GDate.

• Returns -1 if this < date. (less-than)
• Returns 0 if this == date. (equal)
• Returns 1 if this > date. (greater-than)
• Returns 2 if this <> date. (incomparable)

Two instances are incomparable if they have different amounts of information.

Specified by:

compareToGDate in interface GDateSpecification

Parameters:

datespec - the date to compare against.

getBuiltinTypeCode

public int getBuiltinTypeCode()

Returns the builtin type code for the shape of the information contained in this instance, or 0 if the instance doesn't contain information corresponding to a Schema type.

Value will be equal to SchemaType.BTC_NOT_BUILTIN, SchemaType.BTC_G_YEAR, SchemaType.BTC_G_YEAR_MONTH, SchemaType.BTC_G_MONTH, SchemaType.BTC_G_MONTH_DAY, SchemaType.BTC_G_DAY, SchemaType.BTC_DATE, SchemaType.BTC_DATE_TIME, or SchemaType.BTC_TIME.

Specified by:

getBuiltinTypeCode in interface GDateSpecification

add

public GDate add(GDurationSpecification duration)

Adds a duration to this GDate, and returns a new GDate.

subtract

public GDate subtract(GDurationSpecification duration)

Adds a duration to this GDate, and returns a new GDate.

equals

public boolean equals(Object obj)

GDate is an immutable class, and equality is computed based on its canonical value.

Overrides:

equals in class Object

hashCode

public int hashCode()

Returns a hash code for this GDate.

Overrides:

hashCode in class Object

toString

public String toString()

The natural string representation. This represents the information that is available, including timezone. For types that correspond to defined schema types (schemaBuiltinTypeCode() > 0), this provides the natural lexical representation.

When both time and timezone are specified, this string is not the canonical representation unless the timezone is UTC (Z) (since the same moment in time can be expressed in different timezones). To get a canonical string, use the canonicalString() method.

Specified by:

toString in interface GDateSpecification

Overrides:

toString in class Object