org.apache.calcite.plan

Enum Strong.Policy

java.lang.Object

java.lang.Enum<Strong.Policy>

org.apache.calcite.plan.Strong.Policy

All Implemented Interfaces:

Serializable, Comparable<Strong.Policy>

Enclosing class:

Strong

public static enum Strong.Policy
extends Enum<Strong.Policy>

How whether an operator's operands are null affects whether a call to that operator evaluates to null.

Enum Constant Summary

Enum Constants

Enum Constant and Description
ANY This kind of expression is null if and only if at least one of its arguments is null.
AS_IS This kind of expression may be null.
CUSTOM This kind of expression has its own particular rules about whether it is null.
NOT_NULL This kind of expression is never null.

Method Summary

Modifier and Type	Method and Description
static Strong.Policy	valueOf(String name) Returns the enum constant of this type with the specified name.
static Strong.Policy[]	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, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

NOT_NULL

public static final Strong.Policy NOT_NULL

This kind of expression is never null. No need to look at its arguments, if it has any.

CUSTOM

public static final Strong.Policy CUSTOM

This kind of expression has its own particular rules about whether it is null.

ANY

public static final Strong.Policy ANY

This kind of expression is null if and only if at least one of its arguments is null.

AS_IS

public static final Strong.Policy AS_IS

This kind of expression may be null. There is no way to rewrite.

Method Detail

values

public static Strong.Policy[] 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 (Strong.Policy c : Strong.Policy.values())
    System.out.println(c);

Returns:

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

valueOf

public static Strong.Policy valueOf(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:

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

NullPointerException - if the argument is null