net.sf.saxon.sort
Class ComparableAtomicValueComparer
java.lang.Object
net.sf.saxon.sort.ComparableAtomicValueComparer
- AtomicComparer, Serializable
public class ComparableAtomicValueComparer
extends java.lang.Object
A comparer for comparing two "ordinary" atomic values, where the values implement the Comparable
interface and the equals() method with the appropriate XPath semantics. This rules out use of
collations, conversion of untyped atomic values, and context dependencies such as implicit timezone.
ComparableAtomicValueComparer
protected ComparableAtomicValueComparer()
compareAtomicValues
public int compareAtomicValues(AtomicValue a,
AtomicValue b)
Compare two AtomicValue objects according to the rules for their data type. UntypedAtomic
values are compared as if they were strings; if different semantics are wanted, the conversion
must be done by the caller.
- compareAtomicValues in interface AtomicComparer
a
- the first object to be compared. This must be an AtomicValue and it must implement
Comparable with context-free XPath comparison semanticsb
- the second object to be compared. This must be an AtomicValue and it must implement
Comparable with context-free XPath comparison semantics
comparesEqual
public boolean comparesEqual(AtomicValue a,
AtomicValue b)
Compare two AtomicValue objects for equality according to the rules for their data type. UntypedAtomic
values are compared by converting to the type of the other operand.
- comparesEqual in interface AtomicComparer
a
- the first object to be compared. This must be an AtomicValue and it must implement
equals() with context-free XPath comparison semanticsb
- the second object to be compared. This must be an AtomicValue and it must implement
equals() with context-free XPath comparison semantics
- true if the values are equal, false if not
getComparisonKey
public ComparisonKey getComparisonKey(AtomicValue a)
Get a comparison key for an object. This must satisfy the rule that if two objects are equal,
then their comparison keys are equal, and vice versa. There is no requirement that the
comparison keys should reflect the ordering of the underlying objects.
- getComparisonKey in interface AtomicComparer
getInstance
public static ComparableAtomicValueComparer getInstance()
Get the singleton instance of this class
- the singleton instance of this class
provideContext
public AtomicComparer provideContext(XPathContext context)
Supply the dynamic context in case this is needed for the comparison
- provideContext in interface AtomicComparer
context
- the dynamic evaluation context
- either the original AtomicComparer, or a new AtomicComparer in which the context
is known. The original AtomicComparer is not modified