Class PassThroughTupleExpr
java.lang.Object
org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
org.eclipse.rdf4j.federated.algebra.PassThroughTupleExpr
- All Implemented Interfaces:
Serializable,Cloneable,FedXTupleExpr,QueryRef,VariableExpr,QueryModelNode,TupleExpr,VariableScopeChange
Marker
TupleExpr that is used from FedXTupleQuery.evaluate(TupleQueryResultHandler) to allow for
passing through of results to the handler.
Passing through of results to the handler is supported for SingleSourceQuerys, 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 a TupleQueryResultHandler is supplied.
- Author:
- Andreas Schwarte
- See Also:
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Constructor Summary
ConstructorsConstructorDescriptionPassThroughTupleExpr(TupleExpr parsedQuery, TupleQueryResultHandler resultHandler) -
Method Summary
Modifier and TypeMethodDescriptionclone()Returns a (deep) clone of this query model node.Gets the names of the bindings that are guaranteed to be present in the results produced by this tuple expression.Gets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.getExpr()getOrder()Retrieve the attached query information of the tuple expressiongetSupportedOrders(AvailableStatementOrder tripleSource) booleanvoidreplaceChildNode(QueryModelNode current, QueryModelNode replacement) Replaces one of the child nodes with a new node.voidvoidsetPassedThrough(boolean flag) <X extends Exception>
voidvisit(QueryModelVisitor<X> visitor) Visits this node.<X extends Exception>
voidvisitChildren(QueryModelVisitor<X> visitor) Visits the children of this node.Methods inherited from class org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode
getCardinality, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, isCardinalitySet, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, setVariableScopeChange, shouldCacheCardinality, toStringMethods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitMethods inherited from interface org.eclipse.rdf4j.federated.algebra.FedXTupleExpr
getFreeVarCountMethods inherited from interface org.eclipse.rdf4j.query.algebra.QueryModelNode
equals, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, replaceWith, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString
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Constructor Details
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PassThroughTupleExpr
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Method Details
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visitChildren
Description copied from interface:QueryModelNodeVisits the children of this node. The node callsQueryModelNode.visit(QueryModelVisitor)on all of its child nodes.- Specified by:
visitChildrenin interfaceQueryModelNode- Throws:
X extends Exception
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replaceChildNode
Description copied from interface:QueryModelNodeReplaces one of the child nodes with a new node.- Specified by:
replaceChildNodein interfaceQueryModelNode- Parameters:
current- The current child node.replacement- The new child node.
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getResultHandler
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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) -
getBindingNames
Description copied from interface:TupleExprGets the names of the bindings that are, or can be, returned by this tuple expression when it is evaluated.- Specified by:
getBindingNamesin interfaceTupleExpr- Returns:
- A set of binding names.
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getAssuredBindingNames
Description copied from interface:TupleExprGets the names of the bindings that are guaranteed to be present in the results produced by this tuple expression.- Specified by:
getAssuredBindingNamesin interfaceTupleExpr- Returns:
- A set of binding names.
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clone
Description copied from interface:QueryModelNodeReturns a (deep) clone of this query model node. This method recursively clones the entire node tree, starting from this nodes.- Specified by:
clonein interfaceQueryModelNode- Specified by:
clonein interfaceTupleExpr- Overrides:
clonein classAbstractQueryModelNode- Returns:
- A deep clone of this query model node.
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visit
Description copied from interface:QueryModelNodeVisits this node. The node reports itself to the visitor with the proper runtime type.- Specified by:
visitin interfaceQueryModelNode- Throws:
X extends Exception
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getFreeVars
- Specified by:
getFreeVarsin interfaceVariableExpr- Returns:
- a list of free (i.e. unbound) variables in this expression
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getQueryInfo
Description copied from interface:QueryRefRetrieve the attached query information of the tuple expression- Specified by:
getQueryInfoin interfaceQueryRef- Returns:
- the
QueryInfo
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getSupportedOrders
- Specified by:
getSupportedOrdersin interfaceTupleExpr
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setOrder
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getOrder
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