org.eigenbase.rel
Enum JoinRelType

java.lang.Object
  java.lang.Enum<JoinRelType>
      org.eigenbase.rel.JoinRelType

All Implemented Interfaces:

Serializable, Comparable<JoinRelType>

public enum JoinRelType
extends Enum<JoinRelType>

Enumeration of join types.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rel/JoinRelType.java#9 $

Author:

jhyde

Enum Constant Summary

FULL

INNER

LEFT

RIGHT

Method Summary

boolean	generatesNullsOnLeft() Returns whether a join of this type may generate NULL values on the left-hand side.
boolean	generatesNullsOnRight() Returns whether a join of this type may generate NULL values on the right-hand side.
static JoinRelType	valueOf(String name) Returns the enum constant of this type with the specified name.
static JoinRelType[]	values() Returns an array containing the constants of this enum type, in the order they're declared.

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

INNER

public static final JoinRelType INNER

LEFT

public static final JoinRelType LEFT

RIGHT

public static final JoinRelType RIGHT

FULL

public static final JoinRelType FULL

Method Detail

values

public static final JoinRelType[] values()

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

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

Returns:

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

valueOf

public static JoinRelType 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

generatesNullsOnRight

public boolean generatesNullsOnRight()

Returns whether a join of this type may generate NULL values on the right-hand side.

generatesNullsOnLeft

public boolean generatesNullsOnLeft()

Returns whether a join of this type may generate NULL values on the left-hand side.