Class MemTriple

java.lang.Object

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

org.eclipse.rdf4j.sail.memory.model.MemTriple

All Implemented Interfaces:

Serializable, Resource, Triple, Value, MemValue

public class MemTriple
extends MemResource
implements Triple

A MemoryStore-specific implementation of Triple.

Author:

Jeen Broekstra

See Also:

• Serialized Form

Field Summary

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

EMPTY_LIST

Constructor Summary

Constructors

Constructor	Description
MemTriple(Object creator, MemResource subject, MemIRI predicate, MemValue object)

Method Summary

Modifier and Type	Method	Description
void	addContextStatement(MemStatement st)
void	addObjectStatement(MemStatement st)	Adds a statement to this MemValue's list of statements for which it is the object.
void	cleanSnapshotsFromContextStatements(int currentSnapshot)
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 other)	Compares this triple to another object.
int	getContextStatementCount()
MemStatementList	getContextStatementList()
Object	getCreator()	Returns the object that created this MemValue.
MemValue	getObject()	Gets the object of this triple.
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.
MemIRI	getPredicate()	Gets the predicate of this triple.
MemResource	getSubject()	Gets the subject of this triple.
boolean	hasContextStatements()
int	hashCode()	Computes the hash code of this triple.
boolean	hasObjectStatements()
boolean	hasPredicateStatements()
boolean	hasStatements()	Checks whether this MemValue has any statements.
boolean	matchesSPO(MemResource subject, MemIRI predicate, MemValue object)
String	stringValue()	Returns the String-value of a Value object.
String	toString()

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

addSubjectStatement, cleanSnapshotsFromSubjectStatements, getSubjectStatementCount, getSubjectStatementList, hasSubjectStatements

Methods inherited from class java.lang.Object

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

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

isResource

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

isTriple

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

isBNode, isIRI, isLiteral

Constructor Details

MemTriple

public MemTriple(Object creator,
 MemResource subject,
 MemIRI predicate,
 MemValue object)

Method Details

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

toString

public String toString()

Overrides:

toString in class Object

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

getContextStatementList

public MemStatementList getContextStatementList()

Overrides:

getContextStatementList in class MemResource

getContextStatementCount

public int getContextStatementCount()

Overrides:

getContextStatementCount in class MemResource

addContextStatement

public void addContextStatement(MemStatement st)

Overrides:

addContextStatement in class MemResource

cleanSnapshotsFromContextStatements

public void cleanSnapshotsFromContextStatements(int currentSnapshot)

Overrides:

cleanSnapshotsFromContextStatements in class MemResource

getSubject

public MemResource getSubject()

Description copied from interface: Triple

Gets the subject of this triple.

Specified by:

getSubject in interface Triple

Returns:

The triple's subject.

getPredicate

public MemIRI getPredicate()

Description copied from interface: Triple

Gets the predicate of this triple.

Specified by:

getPredicate in interface Triple

Returns:

The triple's predicate.

getObject

public MemValue getObject()

Description copied from interface: Triple

Gets the object of this triple.

Specified by:

getObject in interface Triple

Returns:

The triple's object.

hashCode

public int hashCode()

Description copied from interface: Triple

Computes the hash code of this triple.

Specified by:

hashCode in interface Triple

Overrides:

hashCode in class Object

Returns:

a hash code for this triple computed as Objects.hash( Triple.getSubject(), Triple.getPredicate(), Triple.getObject())

equals

public boolean equals(Object other)

Description copied from interface: Triple

Compares this triple to another object.

Specified by:

equals in interface Triple

Overrides:

equals in class Object

Parameters:

other - the object to compare this triple to

Returns:

true if the other object is an instance of Triple and if their subjects, predicates and objects are equal; false otherwise

hasPredicateStatements

public boolean hasPredicateStatements()

Specified by:

hasPredicateStatements in interface MemValue

hasObjectStatements

public boolean hasObjectStatements()

Specified by:

hasObjectStatements in interface MemValue

hasContextStatements

public boolean hasContextStatements()

Specified by:

hasContextStatements in interface MemValue

Overrides:

hasContextStatements in class MemResource

matchesSPO

public boolean matchesSPO(MemResource subject,
 MemIRI predicate,
 MemValue object)