org.jboss.cache.pojo.util
Class Null

java.lang.Object
  org.jboss.cache.pojo.util.Null

All Implemented Interfaces:

Serializable

public final class Null
extends Object
implements Serializable

Represent null values (based on org.jboss.util.Null)

Author:

Scott Marlow

See Also:

Serialized Form

Method Summary

boolean	equals(Object obj) Check if the given object is a Null instance or null.
int	hashCode() Hashcode of unknown (null) value will be zero.
static Object	toNullKeyObject(Object aObject) Represents null key as a special string value.
static Object	toNullKeyValue(Object aObject) Converts Null string representation back to null value.
static Object	toNullObject(Object aObject) Represents null as a special Null object marker.
static Object	toNullValue(Object aObject) If the passed object represents null (instance of Null.NULL_OBJECT_MARKER), will replace with null value.
String	toString() Return a string representation of null value.

Methods inherited from class java.lang.Object

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

Method Detail

toNullObject

public static final Object toNullObject(Object aObject)

Represents null as a special Null object marker.

Parameters:

aObject -

Returns:

if aObject is null, return Null.NULL_OBJECT_MARKER otherwise return aObject.

toNullKeyObject

public static final Object toNullKeyObject(Object aObject)

Represents null key as a special string value.

Parameters:

aObject -

Returns:

if aObject is null, return Null.NULL_AS_STRING_REPRESENTATION otherwise return aObject.

toNullValue

public static final Object toNullValue(Object aObject)

If the passed object represents null (instance of Null.NULL_OBJECT_MARKER), will replace with null value.

Parameters:

aObject -

Returns:

null if aObject is instance of Null.NULL_OBJECT_MARKER, otherwise return aObject.

toNullKeyValue

public static final Object toNullKeyValue(Object aObject)

Converts Null string representation back to null value.

Parameters:

aObject -

Returns:

null if aObject represents a null, otherwise return aObject.

toString

public String toString()

Return a string representation of null value.

Overrides:

toString in class Object

Returns:

Null.NULL_AS_STRING_REPRESENTATION;

hashCode

public int hashCode()

Hashcode of unknown (null) value will be zero.

Overrides:

hashCode in class Object

Returns:

Zero.

equals

public boolean equals(Object obj)

Check if the given object is a Null instance or null.

Overrides:

equals in class Object

Parameters:

obj - Object to test.

Returns:

True if the given object is a Null instance or null.