Package org.apache.jena.rdf.model
Interface ModelSource
- All Superinterfaces:
ModelGetter
- All Known Subinterfaces:
ModelMaker
- All Known Implementing Classes:
ModelMakerImpl
The revised and soon-to-be-core interface for sources of models,
typically generated from RDF descriptions.
ModelSources can supply models in a variety of ways.
- some fresh model of the kind this ModelSource supplies
- the particular model this ModelSource supplies
- a named model from the collection this ModelSource supplies
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Method Summary
Modifier and TypeMethodDescriptionAnswer this ModelSource's default model.Answer a Model that satisfies this ModelSource's shape.Answer a model.openModelIfPresent
(String string) Answer the model named bystring
in this ModelSource, if it [still] has one, ornull
if there isn't one.Methods inherited from interface org.apache.jena.rdf.model.ModelGetter
getModel, getModel
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Method Details
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createDefaultModel
Model createDefaultModel()Answer this ModelSource's default model. Every ModelSource has a default model. That model need not exist until the first call on createDefaultModel. Multiple calls of getModel will yield the *same* model. This method never returnsnull
. -
createFreshModel
Model createFreshModel()Answer a Model that satisfies this ModelSource's shape. Different calls return different models - they are not permitted to return the same model. (Doing this on a database model will create new, pseudo-anonymous, models.) This method never returnsnull
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openModel
Answer a model. Different ModelSources may implement this in very different ways - ModelSource imposes few constraints other than the result is a proper Model. A ModelSource may use the name to identify an existing Model and re-use it, or it may create a fresh Model each time.It is expected that uses of different names will answer different models (different in the strong sense of not having the same underlying graph, too).
If the ModelSource does not have a model with this name, and if it is not prepared to create one, it should throw a DoesNotExistException. This method never returns
null
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openModelIfPresent
Answer the model named bystring
in this ModelSource, if it [still] has one, ornull
if there isn't one. The ModelSource should not create a fresh model if it doesn't already have one.
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