Class PassThroughTupleExpr
- java.lang.Object
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- org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
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- org.eclipse.rdf4j.federated.algebra.PassThroughTupleExpr
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- All Implemented Interfaces:
Serializable
,Cloneable
,FedXTupleExpr
,QueryRef
,VariableExpr
,GraphPatternGroupable
,QueryModelNode
,TupleExpr
,VariableScopeChange
public class PassThroughTupleExpr extends AbstractQueryModelNode implements FedXTupleExpr
MarkerTupleExpr
that is used fromFedXTupleQuery.evaluate(TupleQueryResultHandler)
to allow for passing through of results to the handler.Passing through of results to the handler is supported for
SingleSourceQuery
s, i.e. if the original query is sent as is to the single relevant source. In this case no materialization and in-memory handling through FedX is done, if aTupleQueryResultHandler
is supplied.- Author:
- Andreas Schwarte
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor Description PassThroughTupleExpr(TupleExpr parsedQuery, TupleQueryResultHandler resultHandler)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description PassThroughTupleExpr
clone()
Returns a (deep) clone of this query model node.Set<String>
getAssuredBindingNames()
Gets the names of the bindings that are guaranteed to be present in the results produced by this tuple expression.Set<String>
getBindingNames()
Gets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.TupleExpr
getExpr()
List<String>
getFreeVars()
QueryInfo
getQueryInfo()
Retrieve the attached query information of the tuple expressionTupleQueryResultHandler
getResultHandler()
boolean
isPassedThrough()
void
setPassedThrough(boolean flag)
<X extends Exception>
voidvisit(QueryModelVisitor<X> visitor)
Visits this node.<X extends Exception>
voidvisitChildren(QueryModelVisitor<X> visitor)
Dummy implementation ofQueryModelNode.visitChildren(org.eclipse.rdf4j.query.algebra.QueryModelVisitor<X>)
that does nothing.-
Methods inherited from class org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
getCardinality, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, isCardinalitySet, isGraphPatternGroup, isVariableScopeChange, nullEquals, replaceChildNode, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, setGraphPatternGroup, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, setVariableScopeChange, shouldCacheCardinality, toString
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Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.federated.algebra.FedXTupleExpr
getFreeVarCount
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Methods inherited from interface org.eclipse.rdf4j.query.algebra.QueryModelNode
equals, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, replaceChildNode, replaceWith, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString
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Constructor Detail
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PassThroughTupleExpr
public PassThroughTupleExpr(TupleExpr parsedQuery, TupleQueryResultHandler resultHandler)
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Method Detail
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visitChildren
public <X extends Exception> void visitChildren(QueryModelVisitor<X> visitor) throws X extends Exception
Description copied from class:AbstractQueryModelNode
Dummy implementation ofQueryModelNode.visitChildren(org.eclipse.rdf4j.query.algebra.QueryModelVisitor<X>)
that does nothing. Subclasses should override this method when they have child nodes.- Specified by:
visitChildren
in interfaceQueryModelNode
- Overrides:
visitChildren
in classAbstractQueryModelNode
- Throws:
X extends Exception
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getResultHandler
public TupleQueryResultHandler getResultHandler()
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getExpr
public TupleExpr getExpr()
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isPassedThrough
public boolean isPassedThrough()
- Returns:
- if the query result has already been passed through to the supplied
TupleQueryResultHandler
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setPassedThrough
public void setPassedThrough(boolean flag)
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getBindingNames
public Set<String> getBindingNames()
Description copied from interface:TupleExpr
Gets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.- Specified by:
getBindingNames
in interfaceTupleExpr
- Returns:
- A set of binding names.
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getAssuredBindingNames
public Set<String> getAssuredBindingNames()
Description copied from interface:TupleExpr
Gets the names of the bindings that are guaranteed to be present in the results produced by this tuple expression.- Specified by:
getAssuredBindingNames
in interfaceTupleExpr
- Returns:
- A set of binding names.
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clone
public PassThroughTupleExpr clone()
Description copied from interface:QueryModelNode
Returns a (deep) clone of this query model node. This method recursively clones the entire node tree, starting from this nodes.- Specified by:
clone
in interfaceQueryModelNode
- Specified by:
clone
in interfaceTupleExpr
- Overrides:
clone
in classAbstractQueryModelNode
- Returns:
- A deep clone of this query model node.
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visit
public <X extends Exception> void visit(QueryModelVisitor<X> visitor) throws X extends Exception
Description copied from interface:QueryModelNode
Visits this node. The node reports itself to the visitor with the proper runtime type.- Specified by:
visit
in interfaceQueryModelNode
- Throws:
X extends Exception
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getFreeVars
public List<String> getFreeVars()
- Specified by:
getFreeVars
in interfaceVariableExpr
- Returns:
- a list of free (i.e. unbound) variables in this expression
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getQueryInfo
public QueryInfo getQueryInfo()
Description copied from interface:QueryRef
Retrieve the attached query information of the tuple expression- Specified by:
getQueryInfo
in interfaceQueryRef
- Returns:
- the
QueryInfo
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