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

java.lang.Object
  extended by de.uplanet.lucy.server.dataobjects.impl.NullValueHolder
All Implemented Interfaces:
IValueHolder<java.lang.Object>

public final class NullValueHolder
extends java.lang.Object
implements IValueHolder<java.lang.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.

Version:
$Revision: 70923 $

Field Summary
static NullValueHolder INSTANCE
          An instance of a NullValueHolder of xsd:anySimpleType.
 
Constructor Summary
NullValueHolder()
           
NullValueHolder(javax.xml.namespace.QName p_qnmType)
           
 
Method Summary
 java.lang.String getCanonicalLexicalRepresentation()
          Get the canonical lexical representation of this value according to it's datatype.
 java.lang.Object getRawValue()
          Get the raw data that this value holder holds.
 javax.xml.namespace.QName getType()
          The type of data this value holder holds.
 java.lang.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()

NullValueHolder

public NullValueHolder(javax.xml.namespace.QName p_qnmType)
Method Detail

getValue

public java.lang.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<java.lang.Object>
Returns:
null.

getRawValue

public java.lang.Object getRawValue()
Description copied from interface: IValueHolder
Get the raw data that this value holder holds.

Specified by:
getRawValue in interface IValueHolder<java.lang.Object>
Returns:
null.

getType

public javax.xml.namespace.QName getType()
Description copied from interface: IValueHolder
The type of data this value holder holds.

Specified by:
getType in interface IValueHolder<java.lang.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<java.lang.Object>
Returns:
Always false.

getCanonicalLexicalRepresentation

public java.lang.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<java.lang.Object>
Returns:
Always null.


Last updated: 2011-08-11 10-04
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