Class 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 Details

    • EPOCH

      public static final DateTimeValue EPOCH
      Fixed date/time used by Java (and Unix) as the origin of the universe: 1970-01-01
  • Constructor Details

    • 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 Details

    • 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

      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
    • hashCode

      static int hashCode(int year, byte month, byte day, byte hour, byte minute, byte second, int microsecond, int tzMinutes)