Enum Class LayerKind

java.lang.Object

java.lang.Enum<LayerKind>

dev.hardwood.reader.LayerKind

All Implemented Interfaces:

Serializable, Comparable<LayerKind>, Constable

@Experimental
public enum LayerKind
extends Enum<LayerKind>

Classifies a ColumnReader layer between root and leaf.

A layer is contributed by a user-authored OPTIONAL group (STRUCT) or by a LIST/MAP-annotated group (REPEATED). REQUIRED groups and the synthetic scaffolding inside a LIST/MAP (the inner repeated group) do not contribute layers.

Stable for the lifetime of the ColumnReader and safe to cache once at open time.

Nested Class Summary

Nested classes/interfaces inherited from class Enum

Enum.EnumDesc<E>

Enum Constant Summary

Enum Constants

Enum Constant	Description
REPEATED	A LIST or MAP-annotated group.
STRUCT	A user-authored OPTIONAL group along the schema chain.

Method Summary

Modifier and Type	Method	Description
static LayerKind	valueOf(String name)	Returns the enum constant of this class with the specified name.
static LayerKind[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

STRUCT

public static final LayerKind STRUCT

A user-authored OPTIONAL group along the schema chain. Contributes a validity bitmap (getLayerValidity) but no offsets.

REPEATED

public static final LayerKind REPEATED

A LIST or MAP-annotated group. Contributes both a validity bitmap (for the list-itself-null distinction) and an offsets buffer (getLayerOffsets) that walks into the next inner layer's items.

Method Details

values

public static LayerKind[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static LayerKind valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null