org.apache.gravitino.rel.expressions.sorts

Enum NullOrdering

java.lang.Object

java.lang.Enum<NullOrdering>

org.apache.gravitino.rel.expressions.sorts.NullOrdering

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<NullOrdering>

@Evolving
public enum NullOrdering
extends java.lang.Enum<NullOrdering>

A null order used in sorting expressions.

Enum Constant Summary

Enum Constants

Enum Constant and Description
NULLS_FIRST Nulls appear before non-nulls.
NULLS_LAST Nulls appear after non-nulls.

Method Summary

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

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

NULLS_FIRST

public static final NullOrdering NULLS_FIRST

Nulls appear before non-nulls. For ascending order, this means nulls appear at the beginning,

NULLS_LAST

public static final NullOrdering NULLS_LAST

Nulls appear after non-nulls. For ascending order, this means nulls appear at the end.

Method Detail

values

public static NullOrdering[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (NullOrdering c : NullOrdering.values())
    System.out.println(c);

Returns:

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

valueOf

public static NullOrdering valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Enum<NullOrdering>