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java.lang.Object net.sf.saxon.expr.sort.EqualityComparer
public class EqualityComparer
A comparer for comparing two atomic values where (a) equals is defined, and is implemented using the Java equals() method, and (b) ordering is not defined, and results in a dynamic error.
Field Summary | |
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static EqualityComparer |
THE_INSTANCE
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Method Summary | |
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int |
compareAtomicValues(AtomicValue a,
AtomicValue b)
Compare two AtomicValue objects according to the rules for their data type. |
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 EqualityComparer |
getInstance()
Get the singleton 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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static EqualityComparer THE_INSTANCE
Method Detail |
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public static EqualityComparer 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 object to be compared. It is intended that this should 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 comparablepublic boolean comparesEqual(AtomicValue a, AtomicValue b)
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
ClassCastException
- if the objects are not comparablepublic ComparisonKey getComparisonKey(AtomicValue a)
getComparisonKey
in interface AtomicComparer
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