Class ReusableGraphQueryResult
java.lang.Object
org.eclipse.rdf4j.spring.resultcache.ReusableGraphQueryResult
- All Implemented Interfaces:
AutoCloseable
,Iterable<Statement>
,Iterator<Statement>
,CloseableIteration<Statement>
,GraphQueryResult
,QueryResult<Statement>
,ThrowableRecorder
Wrapper for a TupleQueryResult, allowing the result to be replayed. Not thread-safe. The wrapper copies the result
data, consuming the original result fully on
close()
.
Example:
TupleQueryResult result = tupleQuery.execute(); ReuseableTupleQueryResult reusable = new ReuseableTupleQueryResult(result); while (reusable.hasNext()) { reuseable.next(); } reuseable.close(); GraphQueryResult cached = reuseable.recreateGraphQueryResult(); while (cached.hasNext()) { cached.next(); } cached.close();
- Since:
- 4.0.0
- Author:
- Florian Kleedorfer
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionboolean
canReuse()
void
close()
Closes this iteration, freeing any resources that it is holding.void
Retrieves relevant namespaces from the query result.boolean
hasNext()
Returnstrue
if the query result has more elements.iterator()
next()
Returns the next element in the query result.boolean
queryBindingsAreIdentical
(BindingSet candidate) void
void
remove()
stream()
Convert the result elements to a JavaStream
.Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface java.util.Iterator
forEachRemaining
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Constructor Details
-
ReusableGraphQueryResult
-
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Method Details
-
queryBindingsAreIdentical
-
canReuse
public boolean canReuse() -
recreateGraphQueryResult
-
recordThrowable
- Specified by:
recordThrowable
in interfaceThrowableRecorder
-
getNamespaces
Description copied from interface:GraphQueryResult
Retrieves relevant namespaces from the query result.
The contents of the Map may be modified after it is returned, as the initial return may be performed when the first RDF Statement is encountered.- Specified by:
getNamespaces
in interfaceGraphQueryResult
- Returns:
- a Map<String, String> object containing (prefix, namespace) pairs.
- Throws:
QueryEvaluationException
-
iterator
-
close
Description copied from interface:CloseableIteration
Closes this iteration, freeing any resources that it is holding. If the iteration has already been closed then invoking this method has no effect.- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceCloseableIteration<Statement>
- Throws:
QueryEvaluationException
-
hasNext
Description copied from interface:QueryResult
Returnstrue
if the query result has more elements. (In other words, returnstrue
ifQueryResult.next()
would return an element rather than throwing aNoSuchElementException
.)- Specified by:
hasNext
in interfaceIterator<Statement>
- Specified by:
hasNext
in interfaceQueryResult<Statement>
- Returns:
true
if the iteration has more elements.- Throws:
QueryEvaluationException
- if an error occurs while executing the query.
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next
Description copied from interface:QueryResult
Returns the next element in the query result.- Specified by:
next
in interfaceIterator<Statement>
- Specified by:
next
in interfaceQueryResult<Statement>
- Returns:
- the next element in the query result.
- Throws:
QueryEvaluationException
- if an error occurs while executing the query.
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remove
- Specified by:
remove
in interfaceIterator<Statement>
- Throws:
QueryEvaluationException
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stream
Description copied from interface:QueryResult
Convert the result elements to a JavaStream
. Note that the consumer should take care to close the stream (by calling Stream#close() or using try-with-resource) if it is not fully consumed.- Specified by:
stream
in interfaceCloseableIteration<Statement>
- Specified by:
stream
in interfaceQueryResult<Statement>
- Returns:
- stream a
Stream
of query result elements.
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forEach
-
spliterator
- Specified by:
spliterator
in interfaceIterable<Statement>
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