edu.utep.cs.et.rat.val
Class NullValue

java.lang.Object
  edu.utep.cs.et.rat.val.NullValue

All Implemented Interfaces:

Denotable

public class NullValue
extends Object
implements Denotable

A class to represent the null value.

Version:

$Revision: 1.5 $

Author:

Yoonsik Cheon

Field Summary

private Class

type The type of this null value.

Constructor Summary

NullValue(Class type)
Creates a new instance representing the null value of the given type.

Method Summary

String	code() Returns Java code for null.
boolean	isEquivalentTo(Denotable another) Returns true if the represented value is equal (==) to the argument's represented value.
boolean	isNull() Returns true if this value represents null.
String	toString() Returns the string "null".
Class	type() Returns the type of this null value.
Object	value() Returns the null value.

Methods inherited from class java.lang.Object

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

Field Detail

type

private Class type

The type of this null value.

Constructor Detail

NullValue

public NullValue(Class type)

Creates a new instance representing the null value of the given type.

Method Detail

value

public Object value()

Returns the null value.

Specified by:

value in interface Denotable

type

public Class type()

Returns the type of this null value.

Specified by:

type in interface Denotable

isNull

public boolean isNull()

Returns true if this value represents null. This method always returns true.

Specified by:

isNull in interface Denotable

toString

public String toString()

Returns the string "null".

Specified by:

toString in interface Denotable

Overrides:

toString in class Object

code

public String code()

Returns Java code for null.

Specified by:

code in interface Denotable

isEquivalentTo

public boolean isEquivalentTo(Denotable another)

Returns true if the represented value is equal (==) to the argument's represented value.

Specified by:

isEquivalentTo in interface Denotable