Package io.deephaven.engine.table.impl.dataindex

Class DataIndexUtils

java.lang.Object

io.deephaven.engine.table.impl.dataindex.DataIndexUtils

public class DataIndexUtils
extends Object

Tools for working with data indices.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DataIndexUtils.LookupKeyedObjectKey<VALUE_TYPE>	A KeyedObjectKey that for values keyed by a lookup key.

Constructor Summary

Constructors

Constructor	Description
DataIndexUtils()

Method Summary

Modifier and Type	Method	Description
static ToLongFunction<Object>	buildRowKeyMappingFunction(Table indexTable, String[] keyColumnNames)	Build a mapping function from the lookup keys of the provided index Table to row keys in the table.
static int	hashLookupKey(@Nullable Object key)	Compute the hash code for a data index lookup key.
static boolean	lookupKeysEqual(@Nullable Object key1, @Nullable Object key2)	Test equality between two data index lookup keys.
static ChunkSource.WithPrev<Values>	makeBoxedKeySource(@NotNull ColumnSource<?>... keySources)	Make a ChunkSource that produces data index lookup keys from keySources.
static DataIndexKeySet	makeKeySet(int keyColumnCount)	Make a DataIndexKeySet that stores data index lookup keys that have keyColumnCount components.
static DataIndexKeySet	makeKeySet(int keyColumnCount, int initialCapacity)	Make a DataIndexKeySet that stores data index lookup keys that have keyColumnCount components.

Methods inherited from class java.lang.Object

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

Constructor Details

DataIndexUtils

public DataIndexUtils()

Method Details

makeBoxedKeySource

public static ChunkSource.WithPrev<Values> makeBoxedKeySource(@NotNull
 @NotNull ColumnSource<?>... keySources)

Make a ChunkSource that produces data index lookup keys from keySources.

Parameters:

keySources - The individual key sources

Returns:

The boxed key source

makeKeySet

public static DataIndexKeySet makeKeySet(int keyColumnCount)

Make a DataIndexKeySet that stores data index lookup keys that have keyColumnCount components.

Parameters:

keyColumnCount - The number of key components

Returns:

The key set

makeKeySet

public static DataIndexKeySet makeKeySet(int keyColumnCount,
 int initialCapacity)

Make a DataIndexKeySet that stores data index lookup keys that have keyColumnCount components.

Parameters:

keyColumnCount - The number of key components

initialCapacity - The initial capacity

Returns:

The key set

lookupKeysEqual

public static boolean lookupKeysEqual(@Nullable
 @Nullable Object key1,
 @Nullable
 @Nullable Object key2)

Test equality between two data index lookup keys.

Returns:

Whether the two keys are equal

hashLookupKey

public static int hashLookupKey(@Nullable
 @Nullable Object key)

Compute the hash code for a data index lookup key.

Parameters:

key - The lookup key

Returns:

The hash code

buildRowKeyMappingFunction

public static ToLongFunction<Object> buildRowKeyMappingFunction(Table indexTable,
 String[] keyColumnNames)

Build a mapping function from the lookup keys of the provided index Table to row keys in the table.

Parameters:

indexTable - The Table to search

keyColumnNames - The key columns to search

Returns:

A mapping function from lookup keys to indexTable row keys