Package org.eclipse.rdf4j.federated.algebra

Class SingleSourceQuery

java.lang.Object

org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode

org.eclipse.rdf4j.federated.algebra.SingleSourceQuery

All Implemented Interfaces:

Serializable, Cloneable, QueryRef, QueryModelNode, TupleExpr, VariableScopeChange

public class SingleSourceQuery
extends AbstractQueryModelNode
implements TupleExpr, QueryRef

A query which has a single relevant source. These queries can be sent entirely to the endpoint as-is.

Author:

Andreas Schwarte

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
SingleSourceQuery(TupleExpr parsedQuery, Endpoint source, QueryInfo queryInfo)

Method Summary

Modifier and Type	Method	Description
SingleSourceQuery	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.
Var	getOrder()
QueryInfo	getQueryInfo()	Retrieve the attached query information of the tuple expression
String	getQueryString()
String	getSignature()	Default implementation of QueryModelNode.getSignature() that prints the name of the node's class.
Endpoint	getSource()
Set<Var>	getSupportedOrders(AvailableStatementOrder tripleSource)
void	replaceChildNode(QueryModelNode current, QueryModelNode replacement)	Replaces one of the child nodes with a new node.
void	setOrder(Var var)
<X extends Exception> void	visit(QueryModelVisitor<X> visitor)	Visits this node.
<X extends Exception> void	visitChildren(QueryModelVisitor<X> visitor)	Visits the children of this node.

Methods inherited from class org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode

getCardinality, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getTotalTimeNanosActual, isCardinalitySet, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, setVariableScopeChange, shouldCacheCardinality, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.eclipse.rdf4j.query.algebra.QueryModelNode

equals, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getTotalTimeNanosActual, replaceWith, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString

Constructor Details

SingleSourceQuery

public SingleSourceQuery(TupleExpr parsedQuery,
 Endpoint source,
 QueryInfo queryInfo)

Parameters:

parsedQuery -

source -

queryInfo -

Method Details

getSource

public Endpoint getSource()

getQueryString

public String getQueryString()

getQueryInfo

public QueryInfo getQueryInfo()

Description copied from interface: QueryRef

Retrieve the attached query information of the tuple expression

Specified by:

getQueryInfo in interface QueryRef

Returns:

the QueryInfo

visit

public <X extends Exception> void visit(QueryModelVisitor<X> visitor)
                                 throws X

Description copied from interface: QueryModelNode

Visits this node. The node reports itself to the visitor with the proper runtime type.

Specified by:

visit in interface QueryModelNode

Throws:

X

visitChildren

public <X extends Exception> void visitChildren(QueryModelVisitor<X> visitor)
                                         throws X

Description copied from interface: QueryModelNode

Visits the children of this node. The node calls QueryModelNode.visit(QueryModelVisitor) on all of its child nodes.

Specified by:

visitChildren in interface QueryModelNode

Throws:

X

replaceChildNode

public void replaceChildNode(QueryModelNode current,
 QueryModelNode replacement)

Description copied from interface: QueryModelNode

Replaces one of the child nodes with a new node.

Specified by:

replaceChildNode in interface QueryModelNode

Parameters:

current - The current child node.

replacement - The new child node.

getSignature

public String getSignature()

Description copied from class: AbstractQueryModelNode

Default implementation of QueryModelNode.getSignature() that prints the name of the node's class.

Specified by:

getSignature in interface QueryModelNode

Overrides:

getSignature in class AbstractQueryModelNode

Returns:

The node's signature, e.g. SLICE (offset=10, limit=10).

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 interface TupleExpr

Returns:

A set of binding names.

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 interface TupleExpr

Returns:

A set of binding names.

clone

public SingleSourceQuery 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 interface QueryModelNode

Specified by:

clone in interface TupleExpr

Overrides:

clone in class AbstractQueryModelNode

Returns:

A deep clone of this query model node.

getSupportedOrders

public Set<Var> getSupportedOrders(AvailableStatementOrder tripleSource)

Specified by:

getSupportedOrders in interface TupleExpr

setOrder

public void setOrder(Var var)

Specified by:

setOrder in interface TupleExpr

getOrder

public Var getOrder()

Specified by:

getOrder in interface TupleExpr