org.topbraid.spin.system

Class MagicPropertyPolicy

java.lang.Object

org.topbraid.spin.system.MagicPropertyPolicy

public class MagicPropertyPolicy
extends Object

A singleton used by the evaluation of magic properties (SPINARQPFunction) to determine whether asserted values and/or dynamically computed values shall be returned in SPARQL queries. Applications can replace the singleton and override the default behavior, which is to return both the existing triples and the dynamically computed ones. This allows applications to control caches of pre-computed values to avoid costly function calls.

Author:

Holger Knublauch

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MagicPropertyPolicy.Policy

Constructor Summary

Constructors

Constructor and Description
MagicPropertyPolicy()

Method Summary

Modifier and Type	Method and Description
static MagicPropertyPolicy	get()
MagicPropertyPolicy.Policy	getPolicy(String functionURI, org.apache.jena.graph.Graph graph, org.apache.jena.graph.Node matchSubject, org.apache.jena.graph.Node matchObject) Checks whether a given magic property call should return asserted triples, dynamically computed query results, or both for a given subject/object combination.
static void	set(MagicPropertyPolicy value)

Methods inherited from class java.lang.Object

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

Constructor Detail

MagicPropertyPolicy

public MagicPropertyPolicy()

Method Detail

get

public static MagicPropertyPolicy get()

set

public static void set(MagicPropertyPolicy value)

getPolicy

public MagicPropertyPolicy.Policy getPolicy(String functionURI,
                                            org.apache.jena.graph.Graph graph,
                                            org.apache.jena.graph.Node matchSubject,
                                            org.apache.jena.graph.Node matchObject)

Checks whether a given magic property call should return asserted triples, dynamically computed query results, or both for a given subject/object combination.

Parameters:

functionURI - the URI of the function

graph - the Graph to query

matchSubject - the subject Node or null

matchObject - the object Node or null

Returns:

the Policy