Package org.eclipse.rdf4j.sail.base
Class UnionSailDataset
java.lang.Object
org.eclipse.rdf4j.sail.base.UnionSailDataset
- All Implemented Interfaces:
AutoCloseable
,SailClosable
,SailDataset
Combines two
SailDataset
into a single view.-
Field Summary
Fields -
Constructor Summary
ConstructorsModifierConstructorDescriptionprivate
UnionSailDataset
(SailDataset dataset1, SailDataset dataset2) -
Method Summary
Modifier and TypeMethodDescriptionvoid
close()
Called when thisSailDataset
is no longer is used, such as when a read operation is complete.CloseableIteration
<? extends Resource, SailException> Returns the set of all unique context identifiers that are used to store statements.static SailDataset
getInstance
(SailDataset dataset1, SailDataset dataset2) Creates a newSailDataset
that includes both the providedSailDataset
s.getNamespace
(String prefix) Gets the namespace that is associated with the specified prefix, if any.CloseableIteration
<? extends Namespace, SailException> Gets the namespaces relevant to the data contained in this object.CloseableIteration
<? extends Statement, SailException> getStatements
(Resource subj, IRI pred, Value obj, Resource... contexts) Gets all statements that have a specific subject, predicate and/or object.CloseableIteration
<? extends Triple, SailException> getTriples
(Resource subj, IRI pred, Value obj) Gets all RDF-star triples that have a specific subject, predicate and/or object.toString()
private <T> CloseableIteration
<? extends T, SailException> union
(CloseableIteration<? extends T, SailException> iteration1, CloseableIteration<? extends T, SailException> iteration2)
-
Field Details
-
dataset1
-
dataset2
-
-
Constructor Details
-
UnionSailDataset
-
-
Method Details
-
getInstance
Creates a newSailDataset
that includes both the providedSailDataset
s. -
toString
-
close
Description copied from interface:SailDataset
Called when thisSailDataset
is no longer is used, such as when a read operation is complete. An isolation level compatible withIsolationLevels.SNAPSHOT
will ensure the state of thisSailDataset
dose not change between the first call to this object untilinvalid reference
SailClosable#release()
- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceSailClosable
- Specified by:
close
in interfaceSailDataset
- Throws:
SailException
- if this resource cannot be closed
-
getNamespaces
Description copied from interface:SailDataset
Gets the namespaces relevant to the data contained in this object.- Specified by:
getNamespaces
in interfaceSailDataset
- Returns:
- An iterator over the relevant namespaces, should not contain any duplicates.
- Throws:
SailException
- If this object encountered an error or unexpected situation internally.
-
getNamespace
Description copied from interface:SailDataset
Gets the namespace that is associated with the specified prefix, if any.- Specified by:
getNamespace
in interfaceSailDataset
- Parameters:
prefix
- A namespace prefix, or an empty string in case of the default namespace.- Returns:
- The namespace name that is associated with the specified prefix, or null if there is no such namespace.
- Throws:
SailException
- If this object encountered an error or unexpected situation internally.
-
getContextIDs
Description copied from interface:SailDataset
Returns the set of all unique context identifiers that are used to store statements.- Specified by:
getContextIDs
in interfaceSailDataset
- Returns:
- An iterator over the context identifiers, should not contain any duplicates.
- Throws:
SailException
-
getStatements
public CloseableIteration<? extends Statement,SailException> getStatements(Resource subj, IRI pred, Value obj, Resource... contexts) throws SailException Description copied from interface:SailDataset
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 interfaceSailDataset
- 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 all contexts.- Returns:
- An iterator over the relevant statements.
- Throws:
SailException
- If the triple source failed to get the statements.
-
getTriples
public CloseableIteration<? extends Triple,SailException> getTriples(Resource subj, IRI pred, Value obj) throws SailException Description copied from interface:SailDataset
Gets all RDF-star triples that have a specific subject, predicate and/or object. All three parameters may be null to indicate wildcards.- Specified by:
getTriples
in interfaceSailDataset
- 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.- Returns:
- An iterator over the relevant triples.
- Throws:
SailException
- If the triple source failed to get the RDF-star triples.
-
union
private <T> CloseableIteration<? extends T,SailException> union(CloseableIteration<? extends T, SailException> iteration1, CloseableIteration<? extends T, SailException> iteration2)
-