Package org.eclipse.rdf4j.query.algebra

Class UnaryTupleOperator

java.lang.Object

org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode

org.eclipse.rdf4j.query.algebra.UnaryTupleOperator

All Implemented Interfaces:

Serializable, Cloneable, QueryModelNode, TupleExpr, VariableScopeChange

Direct Known Subclasses:

DescribeOperator, Distinct, Extension, Filter, Group, MultiProjection, Order, Projection, QueryRoot, Reduced, Service, Slice

public abstract class UnaryTupleOperator
extends AbstractQueryModelNode
implements TupleExpr

An abstract superclass for unary tuple operators which, by definition, has one argument.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected TupleExpr	arg	The operator's argument.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	UnaryTupleOperator()
protected	UnaryTupleOperator(TupleExpr arg)	Creates a new unary tuple operator.

Method Summary

Modifier and Type	Method	Description
UnaryTupleOperator	clone()	Returns a (deep) clone of this query model node.
boolean	equals(Object o)	Returns true if this query model node and its children are recursively equal to o and its children.
TupleExpr	getArg()	Gets the argument of this unary tuple operator.
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	hashCode()
void	replaceChildNode(QueryModelNode current, QueryModelNode replacement)	Replaces one of the child nodes with a new node.
void	setArg(TupleExpr arg)	Sets the argument of this unary tuple operator.
<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

finalize, getClass, notify, notifyAll, wait, wait, wait

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

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

Field Details

arg

protected TupleExpr arg

The operator's argument.

Constructor Details

UnaryTupleOperator

protected UnaryTupleOperator()

UnaryTupleOperator

protected UnaryTupleOperator(TupleExpr arg)

Creates a new unary tuple operator.

Parameters:

arg - The operator's argument, must not be null.

Method Details

getArg

public TupleExpr getArg()

Gets the argument of this unary tuple operator.

Returns:

The operator's argument.

setArg

public void setArg(TupleExpr arg)

Sets the argument of this unary tuple operator.

Parameters:

arg - The (new) argument for this operator, must not be null.

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.

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.

equals

public boolean equals(Object o)

Description copied from interface: QueryModelNode

Returns true if this query model node and its children are recursively equal to o and its children.

Specified by:

equals in interface QueryModelNode

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

clone

public UnaryTupleOperator 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.