edu.cornell.mannlib.vitro.webapp.dao.jena

Class BlankNodeFilteringModelMaker

java.lang.Object

edu.cornell.mannlib.vitro.webapp.modelaccess.adapters.AbstractModelMakerDecorator

edu.cornell.mannlib.vitro.webapp.dao.jena.BlankNodeFilteringModelMaker

All Implemented Interfaces:

org.apache.jena.rdf.model.ModelGetter, org.apache.jena.rdf.model.ModelMaker, org.apache.jena.rdf.model.ModelSource

public class BlankNodeFilteringModelMaker
extends AbstractModelMakerDecorator

Still not sure why this is needed, but... Let's assume that there are some model operations that are implemented by multiple SPARQL queries against the RDFService. Those multiple queries might return different values for the same blank node, so when the results of the queries were combined, the relationships would be lost. To avoid this, we assume that all of the statements involving blank nodes will fit nicely into memory, and we fetch them all at once. After that, all of our operations are against the union of the actual model minus blank nodes and the memory model. The models do retain the same ID for each blank node on successive operations, so we can execute repeated queries and it will work fine. Writing blank nodes is probably a different matter, unless unrelated to existing blank nodes.

Constructor Summary

Constructors

Constructor and Description
BlankNodeFilteringModelMaker(RDFService rdfService, org.apache.jena.rdf.model.ModelMaker inner)

Method Summary

Modifier and Type	Method and Description
org.apache.jena.rdf.model.Model	createModel(String name)
org.apache.jena.rdf.model.Model	createModel(String name, boolean strict)
org.apache.jena.rdf.model.Model	getModel(String name)
org.apache.jena.rdf.model.Model	getModel(String name, org.apache.jena.rdf.model.ModelReader loadIfAbsent)
org.apache.jena.rdf.model.Model	openModel(String name)
org.apache.jena.rdf.model.Model	openModel(String name, boolean strict)
org.apache.jena.rdf.model.Model	openModelIfPresent(String name)
org.apache.jena.rdf.model.Model	wrapModelWithFilter(String name, org.apache.jena.rdf.model.Model model)

Methods inherited from class edu.cornell.mannlib.vitro.webapp.modelaccess.adapters.AbstractModelMakerDecorator

close, createDefaultModel, createFreshModel, getGraphMaker, hasModel, listModels, removeModel, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

BlankNodeFilteringModelMaker

public BlankNodeFilteringModelMaker(RDFService rdfService,
                                    org.apache.jena.rdf.model.ModelMaker inner)

Method Detail

createModel

public org.apache.jena.rdf.model.Model createModel(String name)

Specified by:

createModel in interface org.apache.jena.rdf.model.ModelMaker

Overrides:

createModel in class AbstractModelMakerDecorator

createModel

public org.apache.jena.rdf.model.Model createModel(String name,
                                                   boolean strict)

Specified by:

createModel in interface org.apache.jena.rdf.model.ModelMaker

Overrides:

createModel in class AbstractModelMakerDecorator

openModel

public org.apache.jena.rdf.model.Model openModel(String name)

Specified by:

openModel in interface org.apache.jena.rdf.model.ModelSource

Overrides:

openModel in class AbstractModelMakerDecorator

openModelIfPresent

public org.apache.jena.rdf.model.Model openModelIfPresent(String name)

Specified by:

openModelIfPresent in interface org.apache.jena.rdf.model.ModelSource

Overrides:

openModelIfPresent in class AbstractModelMakerDecorator

getModel

public org.apache.jena.rdf.model.Model getModel(String name)

Specified by:

getModel in interface org.apache.jena.rdf.model.ModelGetter

Overrides:

getModel in class AbstractModelMakerDecorator

getModel

public org.apache.jena.rdf.model.Model getModel(String name,
                                                org.apache.jena.rdf.model.ModelReader loadIfAbsent)

Specified by:

getModel in interface org.apache.jena.rdf.model.ModelGetter

Overrides:

getModel in class AbstractModelMakerDecorator

openModel

public org.apache.jena.rdf.model.Model openModel(String name,
                                                 boolean strict)

Specified by:

openModel in interface org.apache.jena.rdf.model.ModelMaker

Overrides:

openModel in class AbstractModelMakerDecorator

wrapModelWithFilter

public org.apache.jena.rdf.model.Model wrapModelWithFilter(String name,
                                                           org.apache.jena.rdf.model.Model model)