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java.lang.Objectnet.sf.saxon.sort.AtomicSortComparer
A Comparator used for comparing atomic values of arbitrary item types. It encapsulates a Collator that is used when the values to be compared are strings. It also supports a separate method for testing equality of items, which can be used for data types that are not ordered. The AtomicSortComparer is identical to the GenericAtomicComparer except for its handling of NaN: it treats NaN values as lower than any other value, and as equal to each other.
Field Summary | |
static StringValue |
COLLATION_KEY_NaN
|
Method Summary | |
int |
compare(java.lang.Object a,
java.lang.Object 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. |
ComparisonKey |
getComparisonKey(AtomicValue a)
Get a comparison key for an object. |
static AtomicComparer |
makeSortComparer(java.util.Comparator collator,
int itemType,
XPathContext context)
Factory method to get an atomic comparer suitable for sorting or for grouping (operations in which NaN is considered equal to NaN) |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface java.util.Comparator |
equals |
Field Detail |
public static StringValue COLLATION_KEY_NaN
Method Detail |
public static AtomicComparer makeSortComparer(java.util.Comparator collator, int itemType, XPathContext context)
collator
- Collating comparer to be used when comparing stringsitemType
- Primitive item type of the values to be comparedcontext
- Dynamic context (may be an EarlyEvaluationContext)
public int compare(java.lang.Object a, java.lang.Object b)
compare
in interface AtomicComparer
a
- 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.
java.lang.ClassCastException
- if the objects are not comparablepublic boolean comparesEqual(AtomicValue a, AtomicValue b)
comparesEqual
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 equals() method.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.
java.lang.ClassCastException
- if the objects are not comparablepublic ComparisonKey getComparisonKey(AtomicValue a)
getComparisonKey
in interface AtomicComparer
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