net.sf.saxon.sort
public class AtomicSortComparer extends Object implements AtomicComparer
Field Summary | |
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protected static StructuredQName | COLLATION_KEY_NaN |
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. |
ComparisonKey | getComparisonKey(AtomicValue a)
Get a comparison key for an object. |
int | getItemType()
Get the requested item type |
StringCollator | getStringCollator()
Get the underlying StringCollator |
static AtomicComparer | makeSortComparer(StringCollator 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) |
AtomicComparer | provideContext(XPathContext context)
Supply the dynamic context in case this is needed for the comparison
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Parameters: 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.
Returns: <0 if a0 if a>b
Throws: ClassCastException if the objects are not comparable
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
Returns: the item type
Returns: the underlying collator
Parameters: collator Collating comparer to be used when comparing strings. This argument may be null if the itemType excludes the possibility of comparing strings. If the method is called at compile time, this should be a NamedCollation so that it can be cloned at run-time. itemType the primitive item type of the values to be compared context Dynamic context (may be an EarlyEvaluationContext)
Returns: a suitable AtomicComparer
Parameters: context the dynamic evaluation context
Returns: either the original AtomicComparer, or a new AtomicComparer in which the context is known. The original AtomicComparer is not modified