com.bigdata.rdf.axioms

Class BaseAxioms

java.lang.Object

com.bigdata.rdf.axioms.BaseAxioms

All Implemented Interfaces:

Axioms, Externalizable, Serializable

Direct Known Subclasses:

NoAxioms, RdfsAxioms

public abstract class BaseAxioms
extends Object
implements Axioms, Externalizable

A collection of axioms.

Axioms are generated by AbstractTripleStore.create() based on its configured properties. While the implementation class declares axioms in terms of RDF Values, the BaseAxioms only retains the set of {s:p:o} tuples for the term identifiers corresponding those those Values. That {s:p:o} tuple array is the serialized state of this class. When an AbstractTripleStore is reopened, the axioms are de-serialized from a property in the global row store.

Version:

$Id$

Author:

personickm, Bryan Thompson

See Also:

Serialized Form

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BaseAxioms() De-serialization constructor.
protected	BaseAxioms(String namespace) Ctor variant used by AbstractTripleStore.create().

Method Summary

Methods

Modifier and Type	Method and Description
protected void	addAxioms(Collection<BigdataStatement> axioms) Adds all axioms declared by this class into axioms.
Iterator<SPO>	axioms() The axioms in {s:p:o} order by their term identifiers.
String	getNamespace() The namespace of the owning LexiconRelation.
protected BigdataValueFactory	getValueFactory() The value factory to be used when creating axioms.
void	init(AbstractTripleStore db) Uses addAxioms(Collection) to collect the declared axioms and then writes the axioms onto the database specified to the BaseAxioms#BaseAxioms(AbstractTripleStore) ctor.
boolean	isAxiom(IV s, IV p, IV o) Test for an axiom.
void	readExternal(ObjectInput in)
int	size() The #of defined axioms.
void	writeExternal(ObjectOutput out)

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.bigdata.rdf.axioms.Axioms

isNone, isOwlSameAs, isRdfSchema

Constructor Detail

BaseAxioms

protected BaseAxioms()

De-serialization constructor.

BaseAxioms

protected BaseAxioms(String namespace)

Ctor variant used by AbstractTripleStore.create().

Note: When de-serializing a BaseAxioms object the zero-arg ctor will be used.

Parameters:

namespace - The namespace for the AbstractTripleStore instance.

Method Detail

getNamespace

public final String getNamespace()

Description copied from interface: Axioms

The namespace of the owning LexiconRelation.

Specified by:

getNamespace in interface Axioms

Returns:

getValueFactory

protected final BigdataValueFactory getValueFactory()

The value factory to be used when creating axioms.

Throws:

IllegalStateException - unless the ctor variant was used that specifies the database.

init

public final void init(AbstractTripleStore db)

Uses addAxioms(Collection) to collect the declared axioms and then writes the axioms onto the database specified to the BaseAxioms#BaseAxioms(AbstractTripleStore) ctor.

Throws:

IllegalStateException - if that ctor was not used.

addAxioms

protected void addAxioms(Collection<BigdataStatement> axioms)

Adds all axioms declared by this class into axioms.

Note: Subclasses MUST extend this method to add their axioms into the axioms collection.

Parameters:

axioms - A collection into which the axioms will be inserted.

Throws:

IllegalArgumentException - if the parameter is null.

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

isAxiom

public final boolean isAxiom(IV s,
              IV p,
              IV o)

Description copied from interface: Axioms

Test for an axiom.

Specified by:

isAxiom in interface Axioms

Parameters:

s - The internal value (IV) in the subject position.

p - The internal value (IV) in the predicate position.

o - The internal value (IV) in the object position.

size

public final int size()

Description copied from interface: Axioms

The #of defined axioms.

Specified by:

size in interface Axioms

axioms

public final Iterator<SPO> axioms()

Description copied from interface: Axioms

The axioms in {s:p:o} order by their term identifiers.

Specified by:

axioms in interface Axioms