com.whitestein.lsps.engine.state.xml

Class NullValue

java.lang.Object

com.whitestein.lsps.engine.state.xml.NullValue

All Implemented Interfaces:

UnmarshalCallback, SimpleValue, Value, XmlEntity

public class NullValue
extends Object
implements SimpleValue

Persistent value representing null.

Author:

rba

Field Summary

Fields

Modifier and Type	Field and Description
static NullValue	NULL Null value.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NullValue() Creates empty instance.

Method Summary

Modifier and Type	Method and Description
<T,E extends Throwable> T	accept(ValueVisitor<T,E> visitor) Accepts visitor.
Type	getCompiledType(ModelProviderClientService modelProviderService) Returns the compiled type.
String	getType() Returns the type.
Object	getValue() Returns the contained value.
boolean	isRemoved() Returns true if value is removed
NullValue	makeCopy(ModelInstance targetModelInstance) Creates copy of the value in the target model instance.
void	postUnmarshal(javax.xml.bind.Unmarshaller unmarshaller, Object parent) Callback method invoked after unmarshalling XML data into target.
void	preUnmarshal(javax.xml.bind.Unmarshaller unmarshaller, Object parent) Callback method invoked before unmarshalling into target.
SimpleValue	toSimpleValue() If this is SimpleValue this method returns this, otherwise it returns a ValueRef to this.
String	toString()
Value	toValue() If this is a ValueRef this method returns the referenced value, otherwise it returns this.

Methods inherited from class java.lang.Object

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

Field Detail

NULL

public static final NullValue NULL

Null value.

Constructor Detail

NullValue

protected NullValue()

Creates empty instance.

Method Detail

accept

public <T,E extends Throwable> T accept(ValueVisitor<T,E> visitor)
                                 throws E extends Throwable

Description copied from interface: Value

Accepts visitor.

Specified by:

accept in interface Value

Returns:

the result

Throws:

E

E extends Throwable

getValue

public Object getValue()

Description copied from interface: SimpleValue

Returns the contained value.

Specified by:

getValue in interface SimpleValue

Returns:

the contained value

toSimpleValue

public SimpleValue toSimpleValue()

Description copied from interface: Value

If this is SimpleValue this method returns this, otherwise it returns a ValueRef to this.

Specified by:

toSimpleValue in interface Value

Returns:

a SimpleValue

toValue

public Value toValue()

Description copied from interface: Value

If this is a ValueRef this method returns the referenced value, otherwise it returns this.

Specified by:

toValue in interface Value

Returns:

a Value

preUnmarshal

public void preUnmarshal(javax.xml.bind.Unmarshaller unmarshaller,
                         Object parent)

Description copied from interface: UnmarshalCallback

Callback method invoked before unmarshalling into target.

This method is invoked immediately after target was created and before the unmarshalling of this object begins.

Specified by:

preUnmarshal in interface UnmarshalCallback

parent - instance of JAXB mapped class that will eventually reference target. null when target is root element.

postUnmarshal

public void postUnmarshal(javax.xml.bind.Unmarshaller unmarshaller,
                          Object parent)

Description copied from interface: UnmarshalCallback

Callback method invoked after unmarshalling XML data into target.

This method is invoked after all the properties (except IDREF) are unmarshalled into target, but before target is set into its parent object.

Specified by:

postUnmarshal in interface UnmarshalCallback

parent - instance of JAXB mapped class that will reference target. null when target is root element.

toString

public String toString()

Overrides:

toString in class Object

getType

public String getType()

Description copied from interface: Value

Returns the type.

Specified by:

getType in interface Value

Returns:

the type

getCompiledType

public Type getCompiledType(ModelProviderClientService modelProviderService)

Description copied from interface: Value

Returns the compiled type.

Specified by:

getCompiledType in interface Value

Returns:

the compiled type

makeCopy

public NullValue makeCopy(ModelInstance targetModelInstance)

Description copied from interface: Value

Creates copy of the value in the target model instance.

Specified by:

makeCopy in interface SimpleValue

Specified by:

makeCopy in interface Value

Returns:

copy of the value in the target model instance

isRemoved

public boolean isRemoved()

Description copied from interface: Value

Returns true if value is removed

Specified by:

isRemoved in interface Value

Returns:

true if value is removed