Package de.uplanet.lucy.server.dataobjects.impl

Class NullValueHolder

java.lang.Object

de.uplanet.lucy.server.dataobjects.impl.NullValueHolder

All Implemented Interfaces:

IValueHolder<Object>

public final class NullValueHolder
extends Object
implements IValueHolder<Object>

Convention: Normally you set a value-holder to null if you can't find the requested attribute/field/... . If you find something but the contents is null, then set the specific value-holders value (the object value) to null. When to use the NullValueHolder isn't clear yet.

Field Summary

Fields

Modifier and Type	Field	Description
static NullValueHolder	INSTANCE	An instance of a NullValueHolder of xsd:anySimpleType.

Constructor Summary

Constructors

Constructor	Description
NullValueHolder(QName p_qnmType)

Method Summary

Modifier and Type	Method	Description
String	getCanonicalLexicalRepresentation()	Get the canonical lexical representation of this value according to it's datatype.
Object	getRawValue()	Get the raw data that this value holder holds.
QName	getType()	The type of data this value holder holds.
Object	getValue()	Get the data that this value holder holds.
boolean	hasValue()	Check if this value holder currently holds data or not.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INSTANCE

public static final NullValueHolder INSTANCE

An instance of a NullValueHolder of xsd:anySimpleType.

Constructor Detail

NullValueHolder

public NullValueHolder(QName p_qnmType)

Method Detail

getValue

public Object getValue()

Description copied from interface: IValueHolder

Get the data that this value holder holds.

Implementations MUST ensure that multiple calls to this method will return values that equal each other.

Specified by:

getValue in interface IValueHolder<Object>

Returns:

null.

getRawValue

public Object getRawValue()

Description copied from interface: IValueHolder

Get the raw data that this value holder holds.

Specified by:

getRawValue in interface IValueHolder<Object>

Returns:

null.

getType

public QName getType()

Description copied from interface: IValueHolder

The type of data this value holder holds.

Specified by:

getType in interface IValueHolder<Object>

Returns:

The type given at construction time, or XSD_TYPE.ANYSIMPLETYPE.

hasValue

public boolean hasValue()

Description copied from interface: IValueHolder

Check if this value holder currently holds data or not.

Specified by:

hasValue in interface IValueHolder<Object>

Returns:

Always false.

getCanonicalLexicalRepresentation

public String getCanonicalLexicalRepresentation()

Description copied from interface: IValueHolder

Get the canonical lexical representation of this value according to it's datatype.

Specified by:

getCanonicalLexicalRepresentation in interface IValueHolder<Object>

Returns:

Always null.