net.sf.saxon.value
Class DateTimeValue

java.lang.Object
  net.sf.saxon.value.Value<AtomicValue>
      net.sf.saxon.value.AtomicValue
          net.sf.saxon.value.CalendarValue
              net.sf.saxon.value.DateTimeValue

All Implemented Interfaces:

Comparable, PullEvent, GroundedValue<AtomicValue>, Item<AtomicValue>, ValueRepresentation<AtomicValue>, ConversionResult

public final class DateTimeValue
extends CalendarValue
implements Comparable

A value of type DateTime

Field Summary

static DateTimeValue

EPOCH Fixed date/time used by Java (and Unix) as the origin of the universe: 1970-01-01

Fields inherited from class net.sf.saxon.value.CalendarValue

NO_TIMEZONE

Fields inherited from class net.sf.saxon.value.AtomicValue

typeLabel

Fields inherited from class net.sf.saxon.value.Value

INDETERMINATE_ORDERING

Fields inherited from interface net.sf.saxon.om.ValueRepresentation

EMPTY_VALUE_ARRAY

Constructor Summary

DateTimeValue(Calendar calendar, boolean tzSpecified)
Constructor: create a dateTime value given a Java calendar object

DateTimeValue(int year, byte month, byte day, byte hour, byte minute, byte second, int microsecond, int tz, boolean xsd10Check)
Constructor: construct a DateTimeValue from its components.

Method Summary

CalendarValue	add(DurationValue duration) Add a duration to a dateTime
CalendarValue	adjustTimezone(int timezone) Return a new dateTime with the same normalized value, but in a different timezone.
int	compareTo(CalendarValue other, XPathContext context) Compare the value to another dateTime value, following the XPath comparison semantics
int	compareTo(Object v2) Context-free comparison of two DateTimeValue values.
ValidationFailure	convertToSubType(BuiltInAtomicType subtype) Convert the value to a built-in subtype of xs:dateTime
AtomicValue	copyAsSubType(AtomicType typeLabel) Make a copy of this date, time, or dateTime value, but with a new type label
boolean	equals(Object o) Context-free comparison of two dateTime values
static DateTimeValue	fromJavaDate(Date suppliedDate) Factory method: create a dateTime value given a Java Date object.
static DateTimeValue	fromJulianInstant(BigDecimal instant) Get the DateTimeValue corresponding to a given Julian instant
GregorianCalendar	getCalendar() Get a Java Calendar object representing the value of this DateTime.
CharSequence	getCanonicalLexicalRepresentation() Get the canonical lexical representation as defined in XML Schema.
ComparisonKey	getComparisonKey(XPathContext context) Get a comparison key for this value.
AtomicValue	getComponent(int component) Get a component of the value.
static DateTimeValue	getCurrentDateTime(XPathContext context) Get the dateTime value representing the nominal date/time of this transformation run.
byte	getDay() Get the day component, 1-31
byte	getHour() Get the hour component, 0-23
int	getMicrosecond() Get the microsecond component, 0-999999
byte	getMinute() Get the minute component, 0-59
byte	getMonth() Get the month component, 1-12
CharSequence	getPrimitiveStringValue() Convert to string
BuiltInAtomicType	getPrimitiveType() Determine the primitive type of the value.
Comparable	getSchemaComparable() Get a Comparable value that implements the XML Schema ordering comparison semantics for this value.
byte	getSecond() Get the second component, 0-59
int	getYear() Get the year component, in its internal form (which allows a year zero)
int	hashCode() Hash code for context-free comparison of date time values.
boolean	isXsd10Rules() Ask whether this value uses the XSD 1.0 rules (which don't allow year zero) or the XSD 1.1 rules (which do).
static ConversionResult	makeDateTimeValue(CharSequence s, ConversionRules rules) Factory method: create a dateTime value from a supplied string, in ISO 8601 format
static DateTimeValue	makeDateTimeValue(DateValue date, TimeValue time) Factory method: create a dateTime value given a date and a time.
DateTimeValue	normalize(XPathContext cc) Normalize the date and time to be in timezone Z.
DayTimeDurationValue	subtract(CalendarValue other, XPathContext context) Determine the difference between two points in time, as a duration
DateTimeValue	toDateTime() Convert the value to a DateTime, retaining all the components that are actually present, and substituting conventional values for components that are missing.
DateValue	toDateValue() Extract the Date part
BigDecimal	toJulianInstant() Get the Julian instant: a decimal value whose integer part is the Julian day number multiplied by the number of seconds per day, and whose fractional part is the fraction of the second.
TimeValue	toTimeValue() Extract the Time part

Methods inherited from class net.sf.saxon.value.CalendarValue

adjustTimezone, appendTimezone, appendTimezone, getTimezoneInMinutes, getXPathComparable, hasTimezone, isIdentical, makeCalendarValue, removeTimezone, setTimezoneInMinutes

Methods inherited from class net.sf.saxon.value.AtomicValue

asAtomic, checkPermittedContents, effectiveBooleanValue, getCardinality, getItemType, getLength, getStringValue, getStringValueCS, getTypedValue, getTypeLabel, isNaN, itemAt, iterate, process, setTypeLabel, subsequence, toString

Methods inherited from class net.sf.saxon.value.Value

asItem, asItem, asIterator, asValue, convertToJava, fromItem, getIterator, getSequenceLength, reduce

Methods inherited from class java.lang.Object

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

Field Detail

EPOCH

public static final DateTimeValue EPOCH

Fixed date/time used by Java (and Unix) as the origin of the universe: 1970-01-01

Constructor Detail

DateTimeValue

public DateTimeValue(Calendar calendar,
                     boolean tzSpecified)

Constructor: create a dateTime value given a Java calendar object

Parameters:

calendar - holds the date and time

tzSpecified - indicates whether the timezone is specified

DateTimeValue

public DateTimeValue(int year,
                     byte month,
                     byte day,
                     byte hour,
                     byte minute,
                     byte second,
                     int microsecond,
                     int tz,
                     boolean xsd10Check)

Constructor: construct a DateTimeValue from its components. This constructor performs no validation.

Parameters:

year - The year as held internally (note that the year before 1AD is 0)

month - The month, 1-12

day - The day 1-31

hour - the hour value, 0-23

minute - the minutes value, 0-59

second - the seconds value, 0-59

microsecond - the number of microseconds, 0-999999

tz - the timezone displacement in minutes from UTC. Supply the value CalendarValue.NO_TIMEZONE if there is no timezone component.

xsd10Check - true if the dateTime value should behave under XSD 1.0 rules, that is, negative dates assume there is no year zero. (Not that regardless of this setting, the year argument is set on the basis that the year before +1 is supplied as zero; but if the xsd10Check flag is set, this value will be displayed with a year of -1.)

Method Detail

getCurrentDateTime

public static DateTimeValue getCurrentDateTime(XPathContext context)

Get the dateTime value representing the nominal date/time of this transformation run. Two calls within the same query or transformation will always return the same answer.

Parameters:

context - the XPath dynamic context. May be null, in which case the current date and time are taken directly from the system clock

Returns:

the current xs:dateTime

fromJavaDate

public static DateTimeValue fromJavaDate(Date suppliedDate)
                                  throws XPathException

Factory method: create a dateTime value given a Java Date object. The returned dateTime value will always have a timezone, which will always be UTC.

Parameters:

suppliedDate - holds the date and time

Returns:

the corresponding xs:dateTime value

Throws:

XPathException

makeDateTimeValue

public static DateTimeValue makeDateTimeValue(DateValue date,
                                              TimeValue time)
                                       throws XPathException

Factory method: create a dateTime value given a date and a time.

Parameters:

date - the date

time - the time

Returns:

the dateTime with the given components. If either component is null, returns null

Throws:

XPathException - if the timezones are both present and inconsistent

makeDateTimeValue

public static ConversionResult makeDateTimeValue(CharSequence s,
                                                 ConversionRules rules)

Factory method: create a dateTime value from a supplied string, in ISO 8601 format

Parameters:

s - a string in the lexical space of xs:dateTime

rules - the conversion rules to be used (determining whether year zero is allowed)

Returns:

either a DateTimeValue representing the xs:dateTime supplied, or a ValidationFailure if the lexical value was invalid

convertToSubType

public ValidationFailure convertToSubType(BuiltInAtomicType subtype)

Convert the value to a built-in subtype of xs:dateTime

Parameters:

subtype - the target subtype

Returns:

null if the conversion succeeds; a ValidationFailure describing the failure if it fails.

getPrimitiveType

public BuiltInAtomicType getPrimitiveType()

Determine the primitive type of the value. This delivers the same answer as getItemType().getPrimitiveItemType(). The primitive types are the 19 primitive types of XML Schema, plus xs:integer, xs:dayTimeDuration and xs:yearMonthDuration, and xs:untypedAtomic. For external objects, the result is AnyAtomicType.

Specified by:

getPrimitiveType in class AtomicValue

Returns:

the primitive type

getYear

public int getYear()

Get the year component, in its internal form (which allows a year zero)

Returns:

the year component

getMonth

public byte getMonth()

Get the month component, 1-12

Returns:

the month component

getDay

public byte getDay()

Get the day component, 1-31

Returns:

the day component

getHour

public byte getHour()

Get the hour component, 0-23

Returns:

the hour component (never 24, even if the input was specified as 24:00:00)

getMinute

public byte getMinute()

Get the minute component, 0-59

Returns:

the minute component

getSecond

public byte getSecond()

Get the second component, 0-59

Returns:

the second component

getMicrosecond

public int getMicrosecond()

Get the microsecond component, 0-999999

Returns:

the microsecond component

toDateTime

public DateTimeValue toDateTime()

Convert the value to a DateTime, retaining all the components that are actually present, and substituting conventional values for components that are missing. (This method does nothing in the case of xs:dateTime, but is there to implement a method in the CalendarValue interface).

Specified by:

toDateTime in class CalendarValue

Returns:

the value as an xs:dateTime

isXsd10Rules

public boolean isXsd10Rules()

Ask whether this value uses the XSD 1.0 rules (which don't allow year zero) or the XSD 1.1 rules (which do).

Returns:

true if the value uses the XSD 1.0 rules

normalize

public DateTimeValue normalize(XPathContext cc)
                        throws NoDynamicContextException

Normalize the date and time to be in timezone Z.

Parameters:

cc - used to supply the implicit timezone, used when the value has no explicit timezone

Returns:

in general, a new DateTimeValue in timezone Z, representing the same instant in time. Returns the original DateTimeValue if this is already in timezone Z.

Throws:

NoDynamicContextException - if the implicit timezone is needed and is not available

getComparisonKey

public ComparisonKey getComparisonKey(XPathContext context)
                               throws NoDynamicContextException

Get a comparison key for this value. Two values are equal if and only if they their comparison keys are equal

Specified by:

getComparisonKey in class CalendarValue

Parameters:

context - XPath dynamic context

Returns:

a comparison key

Throws:

NoDynamicContextException - if the implicit timezone is needed and is not available

toJulianInstant

public BigDecimal toJulianInstant()

Get the Julian instant: a decimal value whose integer part is the Julian day number multiplied by the number of seconds per day, and whose fractional part is the fraction of the second. This method operates on the local time, ignoring the timezone. The caller should call normalize() before calling this method to get a normalized time.

Returns:

the Julian instant corresponding to this xs:dateTime value

fromJulianInstant

public static DateTimeValue fromJulianInstant(BigDecimal instant)

Get the DateTimeValue corresponding to a given Julian instant

Parameters:

instant - the Julian instant: a decimal value whose integer part is the Julian day number multiplied by the number of seconds per day, and whose fractional part is the fraction of the second.

Returns:

the xs:dateTime value corresponding to the Julian instant. This will always be in timezone Z.

getCalendar

public GregorianCalendar getCalendar()

Get a Java Calendar object representing the value of this DateTime. This will respect the timezone if there is one, or be in GMT otherwise.

Specified by:

getCalendar in class CalendarValue

Returns:

a Java GregorianCalendar object representing the value of this xs:dateTime value.

getPrimitiveStringValue

public CharSequence getPrimitiveStringValue()

Convert to string

Specified by:

getPrimitiveStringValue in class AtomicValue

Returns:

ISO 8601 representation. The value returned is the localized representation, that is it uses the timezone contained within the value itself.

toDateValue

public DateValue toDateValue()

Extract the Date part

Returns:

a DateValue representing the date part of the dateTime, retaining the timezone or its absence

toTimeValue

public TimeValue toTimeValue()

Extract the Time part

Returns:

a TimeValue representing the date part of the dateTime, retaining the timezone or its absence

getCanonicalLexicalRepresentation

public CharSequence getCanonicalLexicalRepresentation()

Get the canonical lexical representation as defined in XML Schema. This is not always the same as the result of casting to a string according to the XPath rules. For an xs:dateTime it is the date/time adjusted to UTC.

Overrides:

getCanonicalLexicalRepresentation in class Value<AtomicValue>

Returns:

the canonical lexical representation as defined in XML Schema

copyAsSubType

public AtomicValue copyAsSubType(AtomicType typeLabel)

Make a copy of this date, time, or dateTime value, but with a new type label

Specified by:

copyAsSubType in class AtomicValue

Parameters:

typeLabel - the type label to be attached to the new copy. It is the caller's responsibility to ensure that the value actually conforms to the rules for this type.

Returns:

the copied value

adjustTimezone

public CalendarValue adjustTimezone(int timezone)

Return a new dateTime with the same normalized value, but in a different timezone.

Specified by:

adjustTimezone in class CalendarValue

Parameters:

timezone - the new timezone offset, in minutes

Returns:

the date/time in the new timezone. This will be a new DateTimeValue unless no change was required to the original value

add

public CalendarValue add(DurationValue duration)
                  throws XPathException

Add a duration to a dateTime

Specified by:

add in class CalendarValue

Parameters:

duration - the duration to be added (may be negative)

Returns:

the new date

Throws:

XPathException - if the duration is an xs:duration, as distinct from a subclass thereof

subtract

public DayTimeDurationValue subtract(CalendarValue other,
                                     XPathContext context)
                              throws XPathException

Determine the difference between two points in time, as a duration

Overrides:

subtract in class CalendarValue

Parameters:

other - the other point in time

context - the XPath dynamic context

Returns:

the duration as an xs:dayTimeDuration

Throws:

XPathException - for example if one value is a date and the other is a time

getComponent

public AtomicValue getComponent(int component)
                         throws XPathException

Get a component of the value. Returns null if the timezone component is requested and is not present.

Overrides:

getComponent in class AtomicValue

Parameters:

component - identifies the required component, as a constant defined in class Component, for example Component.HOURS

Returns:

the value of the requested component of this value

Throws:

XPathException - if a dynamic error occurs

compareTo

public int compareTo(CalendarValue other,
                     XPathContext context)
              throws NoDynamicContextException

Compare the value to another dateTime value, following the XPath comparison semantics

Specified by:

compareTo in class CalendarValue

Parameters:

other - The other dateTime value

context - XPath dynamic evaluation context

Returns:

negative value if this one is the earler, 0 if they are chronologically equal, positive value if this one is the later. For this purpose, dateTime values with an unknown timezone are considered to be values in the implicit timezone (the Comparable interface requires a total ordering).

Throws:

ClassCastException - if the other value is not a DateTimeValue (the parameter is declared as CalendarValue to satisfy the interface)

NoDynamicContextException - if the implicit timezone is needed and is not available

compareTo

public int compareTo(Object v2)

Context-free comparison of two DateTimeValue values. For this to work, the two values must either both have a timezone or both have none.

Specified by:

compareTo in interface Comparable

Parameters:

v2 - the other value

Returns:

the result of the comparison: -1 if the first is earlier, 0 if they are equal, +1 if the first is later

Throws:

ClassCastException - if the values are not comparable (which might be because no timezone is available)

getSchemaComparable

public Comparable getSchemaComparable()

Description copied from class: AtomicValue

Get a Comparable value that implements the XML Schema ordering comparison semantics for this value. An implementation must be provided for all atomic types.

In the case of data types that are partially ordered, the returned Comparable extends the standard semantics of the compareTo() method by returning the value Value.INDETERMINATE_ORDERING when there is no defined order relationship between two given values. This value is also returned when two values of different types are compared.

Specified by:

getSchemaComparable in class AtomicValue

Returns:

a Comparable that follows XML Schema comparison rules

equals

public boolean equals(Object o)

Context-free comparison of two dateTime values

Specified by:

equals in class AtomicValue

Parameters:

o - the other date time value

Returns:

true if the two values represent the same instant in time

Throws:

ClassCastException - if one of the values has a timezone and the other does not

hashCode

public int hashCode()

Hash code for context-free comparison of date time values. Note that equality testing and therefore hashCode() works only for values with a timezone

Overrides:

hashCode in class Value<AtomicValue>

Returns:

a hash code