Package org.eclipse.rdf4j.sail.memory.model

Class MemBNode

java.lang.Object

org.eclipse.rdf4j.sail.memory.model.MemResource

org.eclipse.rdf4j.sail.memory.model.MemBNode

All Implemented Interfaces:

Serializable, BNode, Resource, Value, MemValue

public class MemBNode
extends MemResource
implements BNode

A MemoryStore-specific extension of BNodeImpl giving it node properties.

See Also:

• Serialized Form

Field Summary

Fields inherited from interface org.eclipse.rdf4j.sail.memory.model.MemValue

EMPTY_LIST

Constructor Summary

Constructors

Constructor	Description
MemBNode(Object creator, String id)	Creates a new MemBNode for a bnode ID.

Method Summary

Modifier and Type	Method	Description
void	addObjectStatement(MemStatement st)	Adds a statement to this MemValue's list of statements for which it is the object.
void	cleanSnapshotsFromObjectStatements(int currentSnapshot)	Removes statements from old snapshots (those that have expired at or before the specified snapshot version) from this MemValue's list of statements for which it is the object.
boolean	equals(Object o)	Compares this blank node to another object.
Object	getCreator()	Returns the object that created this MemValue.
String	getID()	Retrieves this blank node's identifier.
int	getObjectStatementCount()	Gets the number of statements for which this MemValue is the object.
MemStatementList	getObjectStatementList()	Gets the list of statements for which this MemValue is the object.
int	hashCode()	Computes the hash code of this blank node.
boolean	hasObjectStatements()
boolean	hasPredicateStatements()
boolean	hasStatements()	Checks whether this MemValue has any statements.
String	stringValue()	Returns the String-value of a Value object.
String	toString()

Methods inherited from class org.eclipse.rdf4j.sail.memory.model.MemResource

addContextStatement, addSubjectStatement, cleanSnapshotsFromContextStatements, cleanSnapshotsFromSubjectStatements, getContextStatementCount, getContextStatementList, getSubjectStatementCount, getSubjectStatementList, hasContextStatements, hasSubjectStatements

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.eclipse.rdf4j.model.BNode

isBNode

Methods inherited from interface org.eclipse.rdf4j.model.Resource

isResource

Methods inherited from interface org.eclipse.rdf4j.model.Value

isIRI, isLiteral, isTriple

Constructor Details

MemBNode

public MemBNode(Object creator,
 String id)

Creates a new MemBNode for a bnode ID.

Parameters:

creator - The object that is creating this MemBNode.

id - bnode ID.

Method Details

getCreator

public Object getCreator()

Description copied from interface: MemValue

Returns the object that created this MemValue. MemValues are only unique within a single repository, but an application could use several repositories at the same time, passing MemValues generated by one Sail to another Sail. In such situations, the MemValue of the first Sail cannot be used by the second Sail.

Specified by:

getCreator in interface MemValue

hasStatements

public boolean hasStatements()

Description copied from interface: MemValue

Checks whether this MemValue has any statements. A MemValue object has statements if there is at least one statement where it is used as the subject, predicate, object or context value.

Specified by:

hasStatements in interface MemValue

Returns:

true if the MemValue has statements, false otherwise.

getObjectStatementList

public MemStatementList getObjectStatementList()

Description copied from interface: MemValue

Gets the list of statements for which this MemValue is the object.

Specified by:

getObjectStatementList in interface MemValue

Returns:

A MemStatementList containing the statements.

getObjectStatementCount

public int getObjectStatementCount()

Description copied from interface: MemValue

Gets the number of statements for which this MemValue is the object.

Specified by:

getObjectStatementCount in interface MemValue

Returns:

An integer larger than or equal to 0.

addObjectStatement

public void addObjectStatement(MemStatement st)
                        throws InterruptedException

Description copied from interface: MemValue

Adds a statement to this MemValue's list of statements for which it is the object.

Specified by:

addObjectStatement in interface MemValue

Throws:

InterruptedException

cleanSnapshotsFromObjectStatements

public void cleanSnapshotsFromObjectStatements(int currentSnapshot)
                                        throws InterruptedException

Description copied from interface: MemValue

Removes statements from old snapshots (those that have expired at or before the specified snapshot version) from this MemValue's list of statements for which it is the object.

Specified by:

cleanSnapshotsFromObjectStatements in interface MemValue

Parameters:

currentSnapshot - The current snapshot version.

Throws:

InterruptedException

hasPredicateStatements

public boolean hasPredicateStatements()

Specified by:

hasPredicateStatements in interface MemValue

hasObjectStatements

public boolean hasObjectStatements()

Specified by:

hasObjectStatements in interface MemValue

getID

public String getID()

Description copied from interface: BNode

Retrieves this blank node's identifier.

Specified by:

getID in interface BNode

Returns:

A blank node identifier.

stringValue

public String stringValue()

Description copied from interface: Value

Returns the String-value of a Value object. This returns either a Literal's label, a IRI's URI or a BNode's ID.

Specified by:

stringValue in interface Value

equals

public boolean equals(Object o)

Description copied from interface: BNode

Compares this blank node to another object.

Specified by:

equals in interface BNode

Overrides:

equals in class Object

Parameters:

o - the object to compare this blank node to

Returns:

true, if the other object is an instance of BNode and their IDs are equal; false, otherwise.

hashCode

public int hashCode()

Description copied from interface: BNode

Computes the hash code of this blank node.

Specified by:

hashCode in interface BNode

Overrides:

hashCode in class Object

Returns:

a hash code for this blank node computed as BNode.getID().hashCode()

toString

public String toString()

Overrides:

toString in class Object