|
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Object net.sf.saxon.expr.sort.NumericComparer
public class NumericComparer
A Comparer used for comparing sort keys when data-type="number". The items to be compared are converted to numbers, and the numbers are then compared directly. NaN values compare equal to each other, and equal to an empty sequence, but less than anything else.
This class is used in XSLT only, so there is no need to handle XQuery's "empty least" vs "empty greatest" options.
Field Summary | |
---|---|
protected StringToDouble |
converter
|
Constructor Summary | |
---|---|
protected |
NumericComparer()
|
Method Summary | |
---|---|
int |
compareAtomicValues(AtomicValue a,
AtomicValue b)
Compare two Items by converting them to numbers and comparing the numeric values. |
boolean |
comparesEqual(AtomicValue a,
AtomicValue b)
Compare two AtomicValue objects for equality according to the rules for their data type. |
StringCollator |
getCollator()
Get the collation used by this AtomicComparer if any |
ComparisonKey |
getComparisonKey(AtomicValue a)
Get a comparison key for an object. |
static NumericComparer |
getInstance()
|
AtomicComparer |
provideContext(XPathContext context)
Supply the dynamic context in case this is needed for the comparison |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
protected StringToDouble converter
Constructor Detail |
---|
protected NumericComparer()
Method Detail |
---|
public static NumericComparer getInstance()
public StringCollator getCollator()
AtomicComparer
getCollator
in interface AtomicComparer
public AtomicComparer provideContext(XPathContext context)
provideContext
in interface AtomicComparer
context
- the dynamic evaluation context
public int compareAtomicValues(AtomicValue a, AtomicValue b)
compareAtomicValues
in interface AtomicComparer
a
- the first Item to be compared.b
- the second Item to be compared.
ClassCastException
- if the objects are not Itemspublic boolean comparesEqual(AtomicValue a, AtomicValue b)
comparesEqual
in interface AtomicComparer
a
- the first object to be compared.b
- the second object to be compared.
ClassCastException
- if the objects are not comparablepublic ComparisonKey getComparisonKey(AtomicValue a)
getComparisonKey
in interface AtomicComparer
|
|||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |