it.unimi.dico.islab.idbs2.kc.session

Class PredicateManager

java.lang.Object

it.unimi.dico.islab.idbs2.kc.session.PredicateManager

public class PredicateManager
extends Object

Manages object saving and querying for Predicate wrapper. This class contains most used interrogations (such as getAllPredicates() and methods for saving an object of this class.

IMPORTANT: this class has no public constructor. A singleton instance of this class is contained in KCSessionManager class

Author:

Vegeziel

Method Summary

Methods

Modifier and Type	Method and Description
List<KnowledgeChunk>	getDistinctP2FromPredicatesWithP1(KnowledgeChunk p1) Used to load a list of all KnowledgeChunks in the connected database appearing as P2 of a Predicate having p1 as P1.
Predicate	getPredicateById(Integer id) Returns the Predicate instance having id as id.
protected static PredicateManager	getPredicateManager()
List<Predicate>	getPredicatesWithP1Pn(KnowledgeChunk p1, KnowledgeChunk pn) Used to load a list of all predicates having p1 as first edge and pn as last edge in the represented path.
void	saveOrUpdate(Predicate p) Give persistence to the given Predicate object using associated Hibernate mappings.

Methods inherited from class java.lang.Object

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

Method Detail

getPredicateManager

protected static PredicateManager getPredicateManager()

getPredicateById

public Predicate getPredicateById(Integer id)

Returns the Predicate instance having id as id.

Parameters:

id - the identifier of the requested Predicate.

Returns:

the predicate with the id equals to the one passed as argument.

getPredicatesWithP1Pn

public List<Predicate> getPredicatesWithP1Pn(KnowledgeChunk p1,
                                    KnowledgeChunk pn)

Used to load a list of all predicates having p1 as first edge and pn as last edge in the represented path. This method uses the internal Session Factory of this class (different from the one obtained calling the getSessionFactory method.

Returns:

the set of all Predicates with p1 as P1 and pn as Pn.

getDistinctP2FromPredicatesWithP1

public List<KnowledgeChunk> getDistinctP2FromPredicatesWithP1(KnowledgeChunk p1)

Used to load a list of all KnowledgeChunks in the connected database appearing as P2 of a Predicate having p1 as P1. This method uses the internal Session Factory of this class (different from the one obtained calling the getSessionFactory method.

Parameters:

p1 - the first edge of the chosen Predicates.

Returns:

the set of all KnowledgeChunk of type P that are the last edge of a Predicate having p1 as first edge.

saveOrUpdate

public void saveOrUpdate(Predicate p)

Give persistence to the given Predicate object using associated Hibernate mappings.

This method executes the saveOrUpdate method of the Hibernate Session using internal Session Factory of KCSessionManager.