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java.lang.Objectnet.sf.saxon.expr.sort.DoubleSortComparer
public class DoubleSortComparer
An AtomicComparer used for sorting values that are known to be numeric. It also supports a separate method for getting a collation key to test equality of items. This comparator treats NaN values as equal to each other, and less than any other value.
| Method Summary | |
|---|---|
int |
compareAtomicValues(AtomicValue a,
AtomicValue b)
Compare two AtomicValue objects according to the rules for their data type. |
boolean |
comparesEqual(AtomicValue a,
AtomicValue b)
Test whether two values compare equal. |
StringCollator |
getCollator()
Get the collation used by this AtomicComparer if any |
ComparisonKey |
getComparisonKey(AtomicValue a)
Get a comparison key for an object. |
static DoubleSortComparer |
getInstance()
Get the singular instance of this class |
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 |
| Method Detail |
|---|
public static DoubleSortComparer getInstance()
public StringCollator getCollator()
AtomicComparer
getCollator in interface AtomicComparerpublic AtomicComparer provideContext(XPathContext context)
provideContext in interface AtomicComparercontext - the dynamic evaluation context
public int compareAtomicValues(AtomicValue a,
AtomicValue b)
compareAtomicValues in interface AtomicComparera - the first object to be compared. It is intended that this should normally be an instance
of AtomicValue, though this restriction is not enforced. If it is a StringValue, the
collator is used to compare the values, otherwise the value must implement the java.util.Comparable
interface.b - the second object to be compared. This must be comparable with the first object: for
example, if one is a string, they must both be strings.
ClassCastException - if the objects are not comparable
public boolean comparesEqual(AtomicValue a,
AtomicValue b)
comparesEqual in interface AtomicComparera - the first object to be compared.b - the second object to be compared.
public ComparisonKey getComparisonKey(AtomicValue a)
getComparisonKey in interface AtomicComparer
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