net.sf.saxon.expr

Class EquivalenceComparer

java.lang.Object

net.sf.saxon.expr.sort.AtomicSortComparer

net.sf.saxon.expr.EquivalenceComparer

All Implemented Interfaces:

AtomicComparer

public class EquivalenceComparer
extends AtomicSortComparer

A comparer that compares atomic values for equality, with the properties: - non-comparable types compare false - NaN compares equal to NaN

Field Summary

Fields inherited from class net.sf.saxon.expr.sort.AtomicSortComparer

COLLATION_KEY_NaN

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	EquivalenceComparer(StringCollator collator, int itemType, XPathContext context)

Method Summary

Methods

Modifier and Type	Method and Description
protected int	compareNonComparables(AtomicValue a, AtomicValue b) Compare two values that are known to be non-comparable.
String	save() Create a string representation of this AtomicComparer that can be saved in a compiled package and used to reconstitute the AtomicComparer when the package is reloaded

Methods inherited from class net.sf.saxon.expr.sort.AtomicSortComparer

compareAtomicValues, comparesEqual, getCollator, getItemType, getStringCollator, makeSortComparer, provideContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EquivalenceComparer

protected EquivalenceComparer(StringCollator collator,
                   int itemType,
                   XPathContext context)

Method Detail

compareNonComparables

protected int compareNonComparables(AtomicValue a,
                        AtomicValue b)

Compare two values that are known to be non-comparable. In the base class this method throws a ClassCastException. In this subclass it is overridden to return SequenceTool.INDETERMINATE_ORDERING

Overrides:

compareNonComparables in class AtomicSortComparer

Parameters:

a - the first value to be compared

b - the second value to be compared

Returns:

the result of the comparison

save

public String save()

Create a string representation of this AtomicComparer that can be saved in a compiled package and used to reconstitute the AtomicComparer when the package is reloaded

Specified by:

save in interface AtomicComparer

Overrides:

save in class AtomicSortComparer

Returns:

a string representation of the AtomicComparer