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java.lang.Objectnet.sf.saxon.sort.DoubleSortComparer
A Comparator 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 |
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)
Test whether two values compare equal. |
ComparisonKey |
getComparisonKey(AtomicValue a)
Get a comparison key for an object. |
static DoubleSortComparer |
getInstance()
|
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 |
Method Detail |
public static DoubleSortComparer getInstance()
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.
public ComparisonKey getComparisonKey(AtomicValue a)
getComparisonKey
in interface AtomicComparer
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