Package io.deephaven.engine.table.impl

Class ComparatorRegistry

java.lang.Object

io.deephaven.engine.table.impl.ComparatorRegistry

public class ComparatorRegistry
extends Object

The ComparatorRegistry is a set of default comparators for sort operations.

Only types that are not themselves Comparable (meaning they do not have their own natural order) may be registered.

Field Summary

Fields

Modifier and Type	Field	Description
static final ComparatorRegistry	INSTANCE

Method Summary

Modifier and Type	Method	Description
void	clear()	Removes all registered comparators from the registry.
<T> Comparator<T>	getComparator(Class<T> type)	Retrieves the comparator that TableOperations.sort(java.lang.String...) uses for the given type.
<T> void	registerComparator(Class<T> type, Comparator<T> comparator)	Adds a new Comparator for the given type to the registry.
void	reset()	Resets the Comparator registry to the default set of Comparators.

Methods inherited from class java.lang.Object

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

Field Details

INSTANCE

public static final ComparatorRegistry INSTANCE

Method Details

reset

public void reset()

Resets the Comparator registry to the default set of Comparators.

Any user-specified comparators are discarded. Existing sort operations are not affected.

The default set of Comparators includes lexicographical comparators for primitive, String, BigInteger, and BigDecimal arrays.

clear

public void clear()

Removes all registered comparators from the registry.

Any default or user-specified comparators are discarded. Existing sort operations are not affected.

registerComparator

public <T> void registerComparator(Class<T> type,
 Comparator<T> comparator)

Adds a new Comparator for the given type to the registry.

Existing sort operations are not affected.

Parameters:

type - the type to associate with this comparator, the type may not already be Comparable. To sort a type using an order other than the natural order, you must use a ComparatorSortColumn.

comparator - the comparator to register for the given type

getComparator

public <T> Comparator<T> getComparator(Class<T> type)

Retrieves the comparator that TableOperations.sort(java.lang.String...) uses for the given type.

Type Parameters:

T - type's type

Parameters:

type - the type to retrieve the comparator for

Returns:

the comparator for the provided type, or null if one is not registered