Package org.rumbledb.runtime.misc

Class AtomicValueComparison

java.lang.Object

org.rumbledb.runtime.misc.AtomicValueComparison

public final class AtomicValueComparison
extends Object

Atomic equivalence semantics for operations such as distinct-values and grouping. This uses atomic deep equality, including NaN equality. It is intentionally separate from Java equality and map op:same-key: numeric comparison applies type promotion and is not transitive across mixed numeric types.

Method Summary

Modifier and Type	Method	Description
static boolean	equal(Item left, Item right)	Returns whether two atomic values belong to the same distinct/grouping equivalence class.
static boolean	equal(Item left, Item right, String collationUri, ExceptionMetadata metadata)
static int	hash(Item item)	A hash compatible with atomic value comparison.
static int	hash(Item item, String collationUri, ExceptionMetadata metadata)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

equal

public static boolean equal(Item left,
 Item right)

Returns whether two atomic values belong to the same distinct/grouping equivalence class.

equal

public static boolean equal(Item left,
 Item right,
 String collationUri,
 ExceptionMetadata metadata)

hash

public static int hash(Item item)

A hash compatible with atomic value comparison. Numeric values are reduced to float because float is the lowest-precision promotion target: any pair equal after decimal/float/double promotion necessarily has the same float value. Gregorian and duration hashes are deliberately coarse because their comparison depends on timezone normalization or subtype promotion.

hash

public static int hash(Item item,
 String collationUri,
 ExceptionMetadata metadata)