Class RepositoryTripleSource
java.lang.Object
org.eclipse.rdf4j.repository.evaluation.RepositoryTripleSource
- All Implemented Interfaces:
AvailableStatementOrder
,TripleSource
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Field Summary
Fields inherited from interface org.eclipse.rdf4j.query.algebra.evaluation.TripleSource
EMPTY_ITERATION
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionDifferent underlying datastructures may have different ways of ordering statements.CloseableIteration
<? extends Statement> getStatements
(Resource subj, IRI pred, Value obj, Resource... contexts) Gets all statements that have a specific subject, predicate and/or object.Gets a ValueFactory object that can be used to create IRI-, blank node- and literal objects.Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface org.eclipse.rdf4j.query.algebra.evaluation.TripleSource
getStatements, getSupportedOrders
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Constructor Details
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RepositoryTripleSource
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RepositoryTripleSource
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Method Details
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getStatements
public CloseableIteration<? extends Statement> getStatements(Resource subj, IRI pred, Value obj, Resource... contexts) throws QueryEvaluationException Description copied from interface:TripleSource
Gets all statements that have a specific subject, predicate and/or object. All three parameters may be null to indicate wildcards. Optionally a (set of) context(s) may be specified in which case the result will be restricted to statements matching one or more of the specified contexts.- Specified by:
getStatements
in interfaceTripleSource
- Parameters:
subj
- A Resource specifying the subject, or null for a wildcard.pred
- A IRI specifying the predicate, or null for a wildcard.obj
- A Value specifying the object, or null for a wildcard.contexts
- The context(s) to get the statements from. Note that this parameter is a vararg and as such is optional. If no contexts are supplied the method operates on the entire repository.- Returns:
- An iterator over the relevant statements.
- Throws:
QueryEvaluationException
- If the triple source failed to get the statements.
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getValueFactory
Description copied from interface:TripleSource
Gets a ValueFactory object that can be used to create IRI-, blank node- and literal objects.- Specified by:
getValueFactory
in interfaceTripleSource
- Returns:
- a ValueFactory object for this TripleSource.
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getComparator
Description copied from interface:TripleSource
Different underlying datastructures may have different ways of ordering statements. On-disk stores typically use a long to represent a value and only stores the actual value in a dictionary, in this case the order would be the order that values where inserted into the dictionary. Stores that instead store values in SPARQL-order can return an instance ofValueComparator
which may allow for further optimizations.Note that this method is experimental and may be changed or removed without notice.
- Specified by:
getComparator
in interfaceTripleSource
- Returns:
- a comparator that matches the order of values in the store
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