org.apache.jdo.impl.jdoql.scope
Class UNDEFINED

java.lang.Object
  org.apache.jdo.impl.jdoql.scope.UNDEFINED

public class UNDEFINED

extends java.lang.Object

An instance of this class represents an undefined value in a ValueTable (ParameterTable or VariableTable).

Author:

Michael Bouschen

Field Summary

private static UNDEFINED

undefined The singleton UNDEFINED instance.

Constructor Summary

private

UNDEFINED() Creates new UNDEFINED.

Method Summary

static UNDEFINED	getInstance() Get an instance of UNDEFINED
java.lang.String	toString() Returns a string representation of an UNDEFINED instance.

Methods inherited from class java.lang.Object

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

Field Detail

undefined

private static UNDEFINED undefined

The singleton UNDEFINED instance.

Constructor Detail

UNDEFINED

private UNDEFINED()

Creates new UNDEFINED. This constructor should not be called directly; instead, the singleton access method getInstance() should be used.

Method Detail

getInstance

public static UNDEFINED getInstance()

Get an instance of UNDEFINED

Returns:

an instance of UNDEFINED

toString

public java.lang.String toString()

Returns a string representation of an UNDEFINED instance.