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

Interface MemValue

All Superinterfaces:

Serializable, Value

All Known Implementing Classes:

BooleanMemLiteral, CalendarMemLiteral, DecimalMemLiteral, IntegerMemLiteral, MemBNode, MemIRI, MemLiteral, MemResource, MemTriple, NumericMemLiteral

public interface MemValue
extends Value

A MemoryStore-specific extension of the Value interface, giving it node properties.

Field Summary

Fields

Modifier and Type	Field	Description
static final MemStatementList	EMPTY_LIST	A shared empty MemStatementList that is returned by MemURI and MemBNode to represent an empty list.

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.
Object	getCreator()	Returns the object that created this MemValue.
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.
boolean	hasContextStatements()
boolean	hasObjectStatements()
boolean	hasPredicateStatements()
boolean	hasStatements()	Checks whether this MemValue has any statements.
boolean	hasSubjectStatements()

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

isBNode, isIRI, isLiteral, isResource, isTriple, stringValue

Field Details

EMPTY_LIST

static final MemStatementList EMPTY_LIST

A shared empty MemStatementList that is returned by MemURI and MemBNode to represent an empty list. The use of a shared list reduces memory usage.

Method Details

getCreator

Object getCreator()

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.

hasStatements

boolean hasStatements()

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.

Returns:

true if the MemValue has statements, false otherwise.

getObjectStatementList

MemStatementList getObjectStatementList()

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

Returns:

A MemStatementList containing the statements.

getObjectStatementCount

int getObjectStatementCount()

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

Returns:

An integer larger than or equal to 0.

addObjectStatement

void addObjectStatement(MemStatement st)
                 throws InterruptedException

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

Throws:

InterruptedException

cleanSnapshotsFromObjectStatements

void cleanSnapshotsFromObjectStatements(int currentSnapshot)
                                 throws InterruptedException

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.

Parameters:

currentSnapshot - The current snapshot version.

Throws:

InterruptedException

hasSubjectStatements

boolean hasSubjectStatements()

hasPredicateStatements

boolean hasPredicateStatements()

hasObjectStatements

boolean hasObjectStatements()

hasContextStatements

boolean hasContextStatements()