Package net.sf.saxon.sort
Interface AtomicComparer
- All Superinterfaces:
Comparator
,Serializable
- All Known Implementing Classes:
AtomicSortComparer
,CalendarValueComparer
,CodepointCollatingComparer
,CollatingAtomicComparer
,ComparableAtomicValueComparer
,DecimalSortComparer
,DoubleSortComparer
,GenericAtomicComparer
Interface representing an object that can be used to compare two XPath atomic values for equality or
for ordering.
-
Method Summary
Modifier and TypeMethodDescriptionint
Compare two AtomicValue objects according to the rules for their data type.boolean
Compare two AtomicValue objects for equality according to the rules for their data type.Get a comparison key for an object.Methods inherited from interface java.util.Comparator
equals, reversed, thenComparing, thenComparing, thenComparing, thenComparingDouble, thenComparingInt, thenComparingLong
-
Method Details
-
compare
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.- Specified by:
compare
in interfaceComparator
- Parameters:
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.- Returns:
- invalid input: '<'0 if ainvalid input: '<'b, 0 if a=b, >0 if a>b
- Throws:
ClassCastException
- if the objects are not comparable
-
comparesEqual
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.- Parameters:
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.- Returns:
- true if the values are equal, false if not
- Throws:
ClassCastException
- if the objects are not comparable
-
getComparisonKey
Get a comparison key for an object. This must satisfy the rule that if two objects are equal according to the XPath eq operator, then their comparison keys are equal according to the Java equals() method, and vice versa. There is no requirement that the comparison keys should reflect the ordering of the underlying objects.
-