Package org.eclipse.rdf4j.query.algebra

Class UnaryValueOperator

java.lang.Object

org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode

org.eclipse.rdf4j.query.algebra.UnaryValueOperator

All Implemented Interfaces:

Serializable, Cloneable, QueryModelNode, ValueExpr, VariableScopeChange

Direct Known Subclasses:

AbstractAggregateOperator, Datatype, IRIFunction, IsBNode, IsLiteral, IsNumeric, IsResource, IsURI, Label, Lang, LocalName, Namespace, Not, Str

public abstract class UnaryValueOperator
extends AbstractQueryModelNode
implements ValueExpr

An abstract superclass for unary value operators which, by definition, has one argument. In special cases the argument can be null, for instance to represent the argument * in COUNT(*).

See Also:

• Serialized Form

Field Summary

Fields

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

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	UnaryValueOperator()
protected	UnaryValueOperator(ValueExpr arg)	Creates a new unary value operator.

Method Summary

Modifier and Type	Method	Description
UnaryValueOperator	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.
ValueExpr	getArg()	Gets the argument of this unary value operator.
int	hashCode()
void	replaceChildNode(QueryModelNode current, QueryModelNode replacement)	Replaces one of the child nodes with a new node.
void	setArg(ValueExpr arg)	Sets the argument of this unary value 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 ValueExpr arg

The operator's argument.

Constructor Details

UnaryValueOperator

protected UnaryValueOperator()

UnaryValueOperator

protected UnaryValueOperator(ValueExpr arg)

Creates a new unary value operator.

Parameters:

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

Method Details

getArg

public ValueExpr getArg()

Gets the argument of this unary value operator.

Returns:

The operator's argument.

setArg

public void setArg(ValueExpr arg)

Sets the argument of this unary value operator.

Parameters:

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

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 UnaryValueOperator 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 ValueExpr

Overrides:

clone in class AbstractQueryModelNode

Returns:

A deep clone of this query model node.