net.sf.saxon.value
Class DateTimeValue

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

All Implemented Interfaces:

java.lang.Comparable, Expression, Item, java.io.Serializable, ValueRepresentation

public final class DateTimeValue

extends CalendarValue

A value of type DateTime

See Also:

Serialized Form

Field Summary

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

NO_TIMEZONE

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

EMPTY_CLASS_ARRAY

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

EMPTY_VALUE_ARRAY

Fields inherited from interface net.sf.saxon.expr.Expression

EVALUATE_METHOD, ITERATE_METHOD, PROCESS_METHOD

Constructor Summary

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

DateTimeValue(java.lang.CharSequence s)
Constructor: create a dateTime value from a supplied string, in ISO 8601 format

DateTimeValue(DateValue date, TimeValue time)
Constructor: create a dateTime value given a date and a time.

DateTimeValue(int year, byte month, byte day, byte hour, byte minute, byte second, int microsecond, int tz)
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 cc) Compare the value to another dateTime value, following the XPath comparison semantics
int	compareTo(java.lang.Object other) Compare the value to another dateTime value.
AtomicValue	convertPrimitive(BuiltInAtomicType requiredType, boolean validate, XPathContext context) Convert to target data type
java.lang.Object	convertToJava(java.lang.Class target, XPathContext context) Convert to Java object (for passing to external functions)
CalendarValue	copy() Make a copy of this date, time, or dateTime value
boolean	equals(java.lang.Object other) Compare two (sequence) values for equality.
static DateTimeValue	fromJulianInstant(java.math.BigDecimal instant) Get the DateTimeValue corresponding to a given Julian instant
java.util.GregorianCalendar	getCalendar() Get a Calendar object representing the value of this DateTime.
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
ItemType	getItemType(TypeHierarchy th) Determine the data type of the exprssion
int	getMicrosecond() Get the microsecond component, 0-999999
byte	getMinute() Get the minute component, 0-59
byte	getMonth() Get the month component, 1-12
byte	getSecond() Get the second component, 0-59
java.lang.CharSequence	getStringValueCS() Convert to string
int	getYear() Get the year component, in its internal form (which allows a year zero)
int	hashCode() Return a hash code to support the equals() function
DateTimeValue	normalize(XPathContext cc) Normalize the date and time to be in timezone Z.
SecondsDurationValue	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
java.math.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.

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

appendTimezone, appendTimezone, getStringValue, getTimezoneInMinutes, hasTimezone, removeTimezone, setTimezoneInMinutes

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

checkPermittedContents, convert, convert, display, effectiveBooleanValue, evaluateAsString, evaluateItem, getCardinality, getImplementationMethod, getLength, getPrimitiveValue, getTypedValue, hasBuiltInType, iterate, process, schemaEquals, toString

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

asItem, asIterator, asValue, collapseWhitespace, convert, convertJavaObjectToXPath, getDependencies, getIterator, getParentExpression, getSpecialProperties, itemAt, iterateSubExpressions, makeQNameValue, normalizeWhitespace, optimize, promote, reduce, simplify, stringToNumber, trimWhitespace, typeCheck

Methods inherited from class java.lang.Object

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

Constructor Detail

DateTimeValue

public DateTimeValue(java.util.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(DateValue date,
                     TimeValue time)
              throws XPathException

Constructor: create a dateTime value given a date and a time.

Parameters:

date - the date

time - the time

Throws:

XPathException - if the timezones are both present and inconsistent

DateTimeValue

public DateTimeValue(java.lang.CharSequence s)
              throws XPathException

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

DateTimeValue

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

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.

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.

getYear

public int getYear()

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

getMonth

public byte getMonth()

Get the month component, 1-12

getDay

public byte getDay()

Get the day component, 1-31

getHour

public byte getHour()

Get the hour component, 0-23

getMinute

public byte getMinute()

Get the minute component, 0-59

getSecond

public byte getSecond()

Get the second component, 0-59

getMicrosecond

public int getMicrosecond()

Get the microsecond component, 0-999999

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

Specified by:

toDateTime in class CalendarValue

normalize

public DateTimeValue normalize(XPathContext cc)

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.

toJulianInstant

public java.math.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.

fromJulianInstant

public static DateTimeValue fromJulianInstant(java.math.BigDecimal instant)

Get the DateTimeValue corresponding to a given Julian instant

getCalendar

public java.util.GregorianCalendar getCalendar()

Get a 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 Calendar object representing the date and time. Note that Java can only represent the time to millisecond precision, and that it does not support the full range of timezones required by XPath (-14:00 to +14:00)

convertPrimitive

public AtomicValue convertPrimitive(BuiltInAtomicType requiredType,
                                    boolean validate,
                                    XPathContext context)

Convert to target data type

Specified by:

convertPrimitive in class AtomicValue

Parameters:

requiredType - an integer identifying the required atomic type

context -

validate - true if validation is required. If set to false, the caller guarantees that the value is valid for the target data type, and that further validation is therefore not required. Note that a validation failure may be reported even if validation was not requested.

Returns:

an AtomicValue, a value of the required type; or an ErrorValue

getStringValueCS

public java.lang.CharSequence getStringValueCS()

Convert to string

Specified by:

getStringValueCS in interface Item

Overrides:

getStringValueCS 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.

getItemType

public ItemType getItemType(TypeHierarchy th)

Determine the data type of the exprssion

Specified by:

getItemType in interface Expression

Overrides:

getItemType in class Value

Parameters:

th -

Returns:

Type.DATE_TIME,

copy

public CalendarValue copy()

Make a copy of this date, time, or dateTime value

Specified by:

copy in class CalendarValue

adjustTimezone

public CalendarValue adjustTimezone(int timezone)

Return a new dateTime with the same normalized value, but in a different timezone. This is called only for a DateTimeValue that has an explicit 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 SecondsDurationValue 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 -

Returns:

the duration as an xdt:dayTimeDuration

Throws:

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

convertToJava

public java.lang.Object convertToJava(java.lang.Class target,
                                      XPathContext context)
                               throws XPathException

Convert to Java object (for passing to external functions)

Overrides:

convertToJava in class Value

Throws:

XPathException

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

Throws:

XPathException

compareTo

public int compareTo(java.lang.Object other)

Compare the value to another dateTime value.

This method is not used for XPath comparisons because it does not have access to the implicitTimezone from the dynamic context. It is available for schema comparisons, although it does not currently implement the XML Schema semantics for timezone comparison (which involve partial ordering)

Parameters:

other - The other dateTime value

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:

java.lang.ClassCastException - if the other value is not a DateTimeValue (the parameter is declared as Object to satisfy the Comparable interface)

compareTo

public int compareTo(CalendarValue other,
                     XPathContext cc)

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

Specified by:

compareTo in class CalendarValue

Parameters:

other - The other dateTime value

cc - A ConversionContext used to supply the implicit timezone

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:

java.lang.ClassCastException - if the other value is not a DateTimeValue (the parameter is declared as Object to satisfy the Comparable interface)

equals

public boolean equals(java.lang.Object other)

Description copied from class: Value

Compare two (sequence) values for equality. This supports identity constraints in XML Schema, which allow list-valued elements and attributes to participate in key and uniqueness constraints. This method returns false if any error occurs during the comparison, or if any of the items in either sequence is a node rather than an atomic value.

Overrides:

equals in class Value

hashCode

public int hashCode()

Description copied from class: Value

Return a hash code to support the equals() function

Overrides:

hashCode in class Value