Package org.eclipse.rdf4j.federated.algebra

Class NTuple

java.lang.Object

org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode

org.eclipse.rdf4j.federated.algebra.NTuple

All Implemented Interfaces:

Serializable, Cloneable, QueryRef, QueryModelNode, TupleExpr, VariableScopeChange

Direct Known Subclasses:

EmptyNJoin, EmptyNUnion, NJoin, NUnion

public abstract class NTuple
extends AbstractQueryModelNode
implements TupleExpr, QueryRef

Base class for any nary-tuple expression

Author:

Andreas Schwarte

See Also:

• NJoin
• NUnion
• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected final List<TupleExpr>	args
protected final QueryInfo	queryInfo

Constructor Summary

Constructors

Constructor	Description
NTuple(List<TupleExpr> args, QueryInfo queryInfo)	Construct an nary-tuple.

Method Summary

Modifier and Type	Method	Description
NTuple	clone()	Returns a (deep) clone of this query model node.
TupleExpr	getArg(int i)
List<TupleExpr>	getArgs()
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.
int	getNumberOfArguments()
QueryInfo	getQueryInfo()	Retrieve the attached query information of the tuple expression
void	replaceChildNode(QueryModelNode current, QueryModelNode replacement)	Replaces one of the child nodes with a new node.
<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, getSignature, 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, getSignature, getTotalTimeNanosActual, replaceWith, setCostEstimate, setParentNode, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString

Field Details

args

protected final List<TupleExpr> args

queryInfo

protected final QueryInfo queryInfo

Constructor Details

NTuple

public NTuple(List<TupleExpr> args,
 QueryInfo queryInfo)

Construct an nary-tuple. Note that the parentNode of all arguments is set to this instance.

Parameters:

args -

Method Details

getArg

public TupleExpr getArg(int i)

getArgs

public List<TupleExpr> getArgs()

getNumberOfArguments

public int getNumberOfArguments()

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

clone

public NTuple 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.

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.

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.

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.

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

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