net.sf.saxon.value
Class GDateValue

java.lang.Object
  extended by net.sf.saxon.value.Value
      extended by net.sf.saxon.value.AtomicValue
          extended by net.sf.saxon.value.CalendarValue
              extended by net.sf.saxon.value.GDateValue
All Implemented Interfaces:
Serializable, PullEvent, SequenceIterable, GroundedValue, Item, ValueRepresentation, ConversionResult
Direct Known Subclasses:
DateValue, GDayValue, GMonthDayValue, GMonthValue, GYearMonthValue, GYearValue

public abstract class GDateValue
extends CalendarValue

Abstract superclass for the primitive types containing date components: xs:date, xs:gYear, xs:gYearMonth, xs:gMonth, xs:gMonthDay, xs:gDay

See Also:
Serialized Form

Field Summary
protected  byte day
           
protected static byte[] daysPerMonth
          Test whether a candidate date is actually a valid date in the proleptic Gregorian calendar
protected  byte month
           
protected static short[] monthData
           
protected  boolean xsd10rules
           
protected  int year
           
 
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
GDateValue()
           
 
Method Summary
 int compareTo(CalendarValue other, XPathContext context)
          Compare this value to another value of the same type, using the supplied context object to get the implicit timezone if required.
 boolean equals(Object o)
          The equals() methods on atomic values is defined to follow the semantics of eq when applied to two atomic values.
 GregorianCalendar getCalendar()
          Get a Java Calendar object that represents this date/time value.
 ComparisonKey getComparisonKey(XPathContext context)
          Get a comparison key for this value.
 AtomicValue getComponent(int component)
          Get a component of the value.
 byte getDay()
          Get the day component of the date (in local form)
 byte getMonth()
          Get the month component of the date (in local form)
 Comparable getSchemaComparable()
          Get a Comparable value that implements the XML Schema ordering comparison semantics for this value.
 int getYear()
          Get the year component of the date (in local form)
 int hashCode()
           
static boolean isLeapYear(int year)
          Test whether a year is a leap year
static boolean isValidDate(int year, int month, int day)
          Determine whether a given date is valid
protected static ConversionResult setLexicalValue(GDateValue d, CharSequence s, ConversionRules rules)
          Initialize the DateValue using a character string in the format yyyy-mm-dd and an optional time zone.
 DateTimeValue toDateTime()
          Convert to DateTime.
 
Methods inherited from class net.sf.saxon.value.CalendarValue
add, adjustTimezone, adjustTimezone, appendTimezone, appendTimezone, getTimezoneInMinutes, getXPathComparable, hasTimezone, isIdentical, makeCalendarValue, removeTimezone, setTimezoneInMinutes, subtract
 
Methods inherited from class net.sf.saxon.value.AtomicValue
asAtomic, checkPermittedContents, convert, convert, convert, convertPrimitive, copyAsSubType, effectiveBooleanValue, getCardinality, getItemType, getLength, getPrimitiveStringValue, getPrimitiveType, 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, getCanonicalLexicalRepresentation, getIterator, iterate, reduce
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Field Detail

year

protected int year

month

protected byte month

day

protected byte day

xsd10rules

protected boolean xsd10rules

daysPerMonth

protected static byte[] daysPerMonth
Test whether a candidate date is actually a valid date in the proleptic Gregorian calendar


monthData

protected static final short[] monthData
Constructor Detail

GDateValue

public GDateValue()
Method Detail

getYear

public int getYear()
Get the year component of the date (in local form)

Returns:
the year component, as represented internally (allowing a year zero)

getMonth

public byte getMonth()
Get the month component of the date (in local form)

Returns:
the month component (1-12)

getDay

public byte getDay()
Get the day component of the date (in local form)

Returns:
the day component (1-31)

getCalendar

public GregorianCalendar getCalendar()
Description copied from class: CalendarValue
Get a Java Calendar object that represents this date/time value. The Calendar object will be newly created for the purpose

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)

setLexicalValue

protected static ConversionResult setLexicalValue(GDateValue d,
                                                  CharSequence s,
                                                  ConversionRules rules)
Initialize the DateValue using a character string in the format yyyy-mm-dd and an optional time zone. Input must have format [-]yyyy-mm-dd[([+|-]hh:mm | Z)]

Parameters:
d - the "raw" DateValue to be populated
s - the supplied string value
rules -
Returns:
either the supplied GDateValue, with its data initialized; or a ValidationFailure

isValidDate

public static boolean isValidDate(int year,
                                  int month,
                                  int day)
Determine whether a given date is valid

Parameters:
year - the year (permitting year zero)
month - the month (1-12)
day - the day (1-31)
Returns:
true if this is a valid date

isLeapYear

public static boolean isLeapYear(int year)
Test whether a year is a leap year

Parameters:
year - the year (permitting year zero)
Returns:
true if the supplied year is a leap year

equals

public boolean equals(Object o)
The equals() methods on atomic values is defined to follow the semantics of eq when applied to two atomic values. When the other operand is not an atomic value, the result is undefined (may be false, may be an exception). When the other operand is an atomic value that cannot be compared with this one, the method returns false.

The hashCode() method is consistent with equals().

This implementation performs a context-free comparison: it fails with ClassCastException if one value has a timezone and the other does not.

Specified by:
equals in class AtomicValue
Parameters:
o - the other value
Returns:
true if the other operand is an atomic value and the two values are equal as defined by the XPath eq operator
Throws:
ClassCastException - if the values are not comparable

hashCode

public int hashCode()
Overrides:
hashCode in class Value

compareTo

public int compareTo(CalendarValue other,
                     XPathContext context)
              throws NoDynamicContextException
Compare this value to another value of the same type, using the supplied context object to get the implicit timezone if required. This method implements the XPath comparison semantics.

Specified by:
compareTo in class CalendarValue
Parameters:
other - the value to be compared
context - the XPath dynamic evaluation context (needed only to get the implicit timezone)
Returns:
-1 if this value is less, 0 if equal, +1 if greater
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

toDateTime

public DateTimeValue toDateTime()
Convert to DateTime.

Specified by:
toDateTime in class CalendarValue
Returns:
the starting instant of the GDateValue (with the same timezone)

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

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

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 evaluation context
Returns:
a comparison key
Throws:
NoDynamicContextException - if the implicit timezone is required and is not available (because the method is being called at compile time)


Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.