net.sf.saxon.value

Class CalendarValue

Implemented Interfaces:
ConversionResult, GroundedValue, Item, PullEvent, Serializable, SequenceIterable, Serializable, ValueRepresentation
Known Direct Subclasses:
DateTimeValue, GDateValue, TimeValue

public abstract class CalendarValue
extends AtomicValue

Abstract superclass for Date, Time, and DateTime.

Field Summary

static int
NO_TIMEZONE

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

typeLabel

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

EMPTY_CLASS_ARRAY, INDETERMINATE_ORDERING

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

EMPTY_VALUE_ARRAY

Method Summary

abstract CalendarValue
add(DurationValue duration)
Add a duration to this date/time value
abstract CalendarValue
adjustTimezone(int tz)
Return a new date, time, or dateTime with the same normalized value, but in a different timezone
CalendarValue
adjustTimezone(DayTimeDurationValue tz)
Return a new date, time, or dateTime with the same normalized value, but in a different timezone, specified as a dayTimeDuration
static void
appendTimezone(int tz, FastStringBuffer sb)
Format a timezone and append it to a buffer
void
appendTimezone(FastStringBuffer sb)
Add a string representation of the timezone, typically formatted as "Z" or "+03:00" or "-10:00", to a supplied string buffer
abstract int
compareTo(CalendarValue other, XPathContext context)
Compare this value to another value of the same type, using the supplied Configuration to get the implicit timezone if required.
abstract GregorianCalendar
getCalendar()
Get a Java Calendar object that represents this date/time value.
abstract ComparisonKey
getComparisonKey(XPathContext context)
Get a comparison key for this value.
String
getStringValue()
Convert the value to a string
int
getTimezoneInMinutes()
Get the timezone value held in this object.
Object
getXPathComparable(boolean ordered, StringCollator collator, XPathContext context)
Get an object value that implements the XPath equality and ordering comparison semantics for this value.
boolean
hasTimezone()
Determine whether this value includes a timezone
CalendarValue
removeTimezone()
Return a date, time, or dateTime with the same localized value, but without the timezone component
void
setTimezoneInMinutes(int minutes)
Modify the timezone value held in this object.
DayTimeDurationValue
subtract(CalendarValue other, XPathContext context)
Determine the difference between two points in time, as a duration
abstract 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

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

asAtomic, checkPermittedContents, convert, convert, convertPrimitive, copyAsSubType, effectiveBooleanValue, equals, getCardinality, getComponent, getItemType, getLength, getPrimitiveType, getSchemaComparable, getStringValue, getStringValueCS, getTypeLabel, getTypedValue, getXPathComparable, isNaN, itemAt, iterate, process, setTypeLabel, subsequence, toString

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

asItem, asItem, asIterator, asValue, checkPermittedContents, convertJavaObjectToXPath, convertToJava, convertToJava, effectiveBooleanValue, equals, fromItem, getCanonicalLexicalRepresentation, getCardinality, getItemType, getIterator, getLength, getSchemaComparable, getStringValue, getStringValueCS, itemAt, iterate, iterate, makeQNameValue, process, reduce, stringToNumber, toString

Field Details

NO_TIMEZONE

public static final int NO_TIMEZONE

Method Details

add

public abstract CalendarValue add(DurationValue duration)
            throws XPathException
Add a duration to this date/time value
Parameters:
duration - the duration to be added (which might be negative)
Returns:
a new date/time value representing the result of adding the duration. The original object is not modified.
Throws:
XPathException -

adjustTimezone

public abstract CalendarValue adjustTimezone(int tz)
Return a new date, time, or dateTime with the same normalized value, but in a different timezone
Parameters:
tz - the new timezone offset from UTC, in minutes
Returns:
the date/time in the new timezone

adjustTimezone

public final CalendarValue adjustTimezone(DayTimeDurationValue tz)
            throws XPathException
Return a new date, time, or dateTime with the same normalized value, but in a different timezone, specified as a dayTimeDuration
Parameters:
tz - the new timezone, in minutes
Returns:
the date/time in the new timezone

appendTimezone

public static void appendTimezone(int tz,
                                  FastStringBuffer sb)
Format a timezone and append it to a buffer
Parameters:
tz - the timezone
sb - the buffer

appendTimezone

public final void appendTimezone(FastStringBuffer sb)
Add a string representation of the timezone, typically formatted as "Z" or "+03:00" or "-10:00", to a supplied string buffer
Parameters:
sb - The StringBuffer that will be updated with the resulting string representation

compareTo

public abstract int compareTo(CalendarValue other,
                              XPathContext context)
            throws NoDynamicContextException
Compare this value to another value of the same type, using the supplied Configuration to get the implicit timezone if required.
Parameters:
other - the other value to be compared
context - the XPath dynamic evaluation context
Returns:
the comparison result
Throws:
NoDynamicContextException - if the supplied context is an early evaluation context and the result depends on the implicit timezone, which is not available at compile time

getCalendar

public abstract GregorianCalendar getCalendar()
Get a Java Calendar object that represents this date/time value. The Calendar object will be newly created for the purpose
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)

getComparisonKey

public abstract 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
Parameters:
context - XPath dynamic evaluation context, used to obtain implicit timezone
Returns:
a comparison key
Throws:
NoDynamicContextException - if the implicit timezone is needed and is not available

getStringValue

public final String getStringValue()
Convert the value to a string
Specified by:
getStringValue in interface Item
getStringValue in interface ValueRepresentation
Overrides:
getStringValue in interface AtomicValue

getTimezoneInMinutes

public final int getTimezoneInMinutes()
Get the timezone value held in this object.
Returns:
The timezone offset from GMT in minutes, positive or negative; or the special value NO_TIMEZONE indicating that the value is not in a timezone

getXPathComparable

public Object getXPathComparable(boolean ordered,
                                 StringCollator collator,
                                 XPathContext context)
            throws NoDynamicContextException
Get an object value that implements the XPath equality and ordering comparison semantics for this value. If the ordered parameter is set to true, the result will be a Comparable and will support a compareTo() method with the semantics of the XPath lt/gt operator, provided that the other operand is also obtained using the getXPathComparable() method. In all cases the result will support equals() and hashCode() methods that support the semantics of the XPath eq operator, again provided that the other operand is also obtained using the getXPathComparable() method. A context argument is supplied for use in cases where the comparison semantics are context-sensitive, for example where they depend on the implicit timezone or the default collation.
Overrides:
getXPathComparable in interface AtomicValue
Parameters:
ordered - true if an ordered comparison is required. In this case the result is null if the type is unordered; in other cases the returned value will be a Comparable.
collator - collation used for strings
context - the XPath dynamic evaluation context, used in cases where the comparison is context sensitive @return an Object whose equals() and hashCode() methods implement the XPath comparison semantics with respect to this atomic value. If ordered is specified, the result will either be null if no ordering is defined, or will be a Comparable

hasTimezone

public final boolean hasTimezone()
Determine whether this value includes a timezone
Returns:
true if there is a timezone in the value, false if not

removeTimezone

public final CalendarValue removeTimezone()
Return a date, time, or dateTime with the same localized value, but without the timezone component
Returns:
the result of removing the timezone

setTimezoneInMinutes

public final void setTimezoneInMinutes(int minutes)
Modify the timezone value held in this object. This must be done only while the value is being constructed.
Parameters:
minutes - The timezone offset from GMT in minutes, positive or negative; or the special value NO_TIMEZONE indicating that the value is not in a timezone (this is the default if this method is not called)

subtract

public DayTimeDurationValue subtract(CalendarValue other,
                                     XPathContext context)
            throws XPathException
Determine the difference between two points in time, as a duration
Parameters:
other - the other point in time
context - the dynamic context, used to obtain timezone information. May be set to null only if both values contain an explicit timezone, or if neither does so.
Returns:
the duration as an xs:dayTimeDuration
Throws:
XPathException - for example if one value is a date and the other is a time

toDateTime

public abstract 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
Returns:
the equivalent DateTimeValue