org.qtitools.qti.value
Class NullValue

java.lang.Object
  org.qtitools.qti.value.NullValue

All Implemented Interfaces:

java.io.Serializable, Value

public class NullValue
extends java.lang.Object
implements Value

Represents NULL value.

This class is not mutable and can contain only NULL value.

Cardinality of this class is always null and BaseType is always null.

Author:

Jiri Kajaba

See Also:

Cardinality, BaseType, Serialized Form

Constructor Summary

NullValue()

Method Summary

boolean	equals(java.lang.Object object) Returns true for any value which is NULL; false otherwise.
BaseType	getBaseType() Returns baseType of this value.
Cardinality	getCardinality() Returns cardinality of this value.
int	hashCode()
boolean	isNull() Returns true if this value is NULL or false otherwise.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

NullValue

public NullValue()

Method Detail

isNull

public boolean isNull()

Description copied from interface: Value

Returns true if this value is NULL or false otherwise.

Specified by:

isNull in interface Value

Returns:

true if this value is NULL or false otherwise

getCardinality

public Cardinality getCardinality()

Description copied from interface: Value

Returns cardinality of this value.

If value is NULL returns null.

Specified by:

getCardinality in interface Value

Returns:

cardinality of this value

getBaseType

public BaseType getBaseType()

Description copied from interface: Value

Returns baseType of this value.

If value is NULL or record cardinality returns null.

Specified by:

getBaseType in interface Value

Returns:

baseType of this value

equals

public boolean equals(java.lang.Object object)

Returns true for any value which is NULL; false otherwise.

Overrides:

equals in class java.lang.Object

Parameters:

object - the reference object with which to compare

Returns:

true for any value which is NULL; false otherwise

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object