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public interface AtomicComparer
Interface representing an object that can be used to compare two XPath atomic values for equality or for ordering.
| Method Summary | |
|---|---|
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. |
AtomicComparer |
provideContext(XPathContext context)
Supply the dynamic context in case this is needed for the comparison |
| Method Detail |
|---|
StringCollator getCollator()
AtomicComparer provideContext(XPathContext context)
context - the dynamic evaluation context
int compareAtomicValues(AtomicValue a,
AtomicValue b)
throws NoDynamicContextException
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 comparable
NoDynamicContextException - if this comparer required access to dynamic context information,
notably the implicit timezone, and this information is not available. In general this happens if a
context-dependent comparison is attempted at compile-time, and it signals the compiler to generate
code that tries again at run-time.
boolean comparesEqual(AtomicValue a,
AtomicValue b)
throws NoDynamicContextException
a - the first object to be compared.b - the second object to be compared.
ClassCastException - if the objects are not comparable
NoDynamicContextException
ComparisonKey getComparisonKey(AtomicValue a)
throws NoDynamicContextException
NoDynamicContextException
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