org.universAAL.context.che.database.impl

Class SesameBackendWithConfidence

java.lang.Object

org.universAAL.context.che.database.impl.SesameBackend

org.universAAL.context.che.database.impl.SesameBackendWithConfidence

All Implemented Interfaces:

Backend

Direct Known Subclasses:

SesameBackendCrdClc2Cnf, SesameBackendCrdClcCnf, SesameBackendCrdCnf

public class SesameBackendWithConfidence
extends SesameBackend

Extension of SesameBackend that interprets the confidence value of received events before storing them. If the confidence is greater than the threshold passed to this class in the constructor or setThreshold, the event will be stored unchanged as in SesameBackend. Otherwise, only statements having the event as subject will be stored, but not reified statements about its subject nor object.

Example:

An "event1" with "subject2" "predicate3" and "object4" with enough confidence will result in having the statements in the store:

"event1" "hasSubject" "subject2"

"event1" "hasPredicate" "predicate3"

"event1" "hasObject" "object4"

"subject2" "predicate3" "object4"

But if the confidence is below the threshold, the last reified statement is not stored.

Author:

alfiva

Field Summary

Fields inherited from class org.universAAL.context.che.database.impl.SesameBackend

PRELOAD_FILE, serializer, tenantAware

Constructor Summary

Constructors

Constructor and Description
SesameBackendWithConfidence() Main constructor.
SesameBackendWithConfidence(int confidence) Constructor with initial confidence.

Method Summary

Modifier and Type	Method and Description
int	getThreshold() Get the threshold for confidence.
void	setThreshold(int threshold) Set the threshold for confidence.
void	storeEvent(ContextEvent e) Stores a ContextEvent in the underlying store.

Methods inherited from class org.universAAL.context.che.database.impl.SesameBackend

close, connect, populate, populate, queryBySPARQL, removeOldEvents, retrieveEvent, retrieveEventsBetweenTstmp, retrieveEventsBySPARQL, retrieveEventsFromTstmp, retrieveEventsToTstmp, setSerializer

Methods inherited from class java.lang.Object

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

Constructor Detail

SesameBackendWithConfidence

public SesameBackendWithConfidence()

Main constructor.

SesameBackendWithConfidence

public SesameBackendWithConfidence(int confidence)

Constructor with initial confidence.

Parameters:

confidence - Threshold for confidence

Method Detail

storeEvent

public void storeEvent(ContextEvent e)

Description copied from interface: Backend

Stores a ContextEvent in the underlying store.

Specified by:

storeEvent in interface Backend

Overrides:

storeEvent in class SesameBackend

Parameters:

e - The context event to be stored.

getThreshold

public int getThreshold()

Get the threshold for confidence.

Returns:

threshold

setThreshold

public final void setThreshold(int threshold)

Set the threshold for confidence.

Parameters:

threshold - for confidence