com.bigdata.rdf.model

Class BigdataValueImpl

java.lang.Object

com.bigdata.rdf.model.BigdataValueImpl

All Implemented Interfaces:

IElement, BigdataValue, Serializable, org.openrdf.model.Value

Direct Known Subclasses:

BigdataLiteralImpl, BigdataResourceImpl

public abstract class BigdataValueImpl
extends Object
implements BigdataValue

Abstract base class for BigdataValue implementations.

Version:

$Id$

Author:

Bryan Thompson

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected IV	iv

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BigdataValueImpl(BigdataValueFactory valueFactory, IV iv)

Method Summary

Methods

Modifier and Type	Method and Description
void	clearInternalValue() Clears the internal value to null.
Object	get(int index) Implements IElement.
IV	getIV() Return the internal value for this value.
BigdataValueFactory	getValueFactory() Return the factory which produced this object.
boolean	isRealIV() Return true if the IV is either is set to a "real" IV.
void	setIV(IV iv) Set the internal value for this value.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.openrdf.model.Value

stringValue

Field Detail

iv

protected volatile IV iv

Constructor Detail

BigdataValueImpl

protected BigdataValueImpl(BigdataValueFactory valueFactory,
                IV iv)

Parameters:

valueFactory - The value factory that created this object (optional).

iv - The internal value (optional).

Method Detail

getValueFactory

public final BigdataValueFactory getValueFactory()

Description copied from interface: BigdataValue

Return the factory which produced this object. This is guaranteed to be a singleton (there will only be one BigdataValueFactory instance for on a given JVM for all BigdataValues associated with a given lexicon relation namespace).

Specified by:

getValueFactory in interface BigdataValue

clearInternalValue

public final void clearInternalValue()

Description copied from interface: BigdataValue

Clears the internal value to null.

Specified by:

clearInternalValue in interface BigdataValue

isRealIV

public final boolean isRealIV()

Description copied from interface: BigdataValue

Return true if the IV is either is set to a "real" IV. Return false if the IV is either not set or is set to a "mock" or "dummy" IV.

Specified by:

isRealIV in interface BigdataValue

getIV

public IV getIV()

Description copied from interface: BigdataValue

Return the internal value for this value. May be a term identifier or an inline value. The term identifier uniquely identifies a Value for a database. Sometimes a TempTripleStore will be used that shares the lexicon with a given database, in which case the same term identifiers will be value for that TempTripleStore.

Specified by:

getIV in interface BigdataValue

setIV

public final void setIV(IV iv)

Description copied from interface: BigdataValue

Set the internal value for this value.

Note: Both IV and BigdataValue can cache one another. The pattern for caching is that you always cache the IV on the BigdataValue using BigdataValue.setIV(IV). However, the BigdataValue is normally NOT cached on the IV. The exception is when the BigdataValue has been materialized from the IV by joining against the lexicon. The query plan is responsible for deciding when to materialize the BigdataValue from the IV.

Specified by:

setIV in interface BigdataValue

Parameters:

iv - The internal value.

get

public Object get(int index)

Implements IElement. BigdataValue acts as a lexicon element, with the term in the 0th index position and the IV in the 1st index position.

Specified by:

get in interface IElement

Parameters:

index - The index.

Returns:

The value at the specified index.