Package org.eclipse.rdf4j.query.algebra

Class NAryValueOperator

java.lang.Object

org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode

org.eclipse.rdf4j.query.algebra.NAryValueOperator

All Implemented Interfaces:

Serializable, Cloneable, QueryModelNode, ValueExpr, VariableScopeChange

Direct Known Subclasses:

Coalesce, ListMemberOperator

public abstract class NAryValueOperator
extends AbstractQueryModelNode
implements ValueExpr

An abstract superclass for N-ary value operators.

Author:

Jeen

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected List<ValueExpr>	args	The operator's arguments.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	NAryValueOperator()
protected	NAryValueOperator(List<ValueExpr> args)	Creates a new N-Ary value operator.

Method Summary

Modifier and Type	Method	Description
void	addArgument(ValueExpr arg)
NAryValueOperator	clone()	Returns a (deep) clone of this query model node.
boolean	equals(Object other)	Returns true if this query model node and its children are recursively equal to o and its children.
List<ValueExpr>	getArguments()
int	hashCode()
void	replaceChildNode(QueryModelNode current, QueryModelNode replacement)	Replaces one of the child nodes with a new node.
void	setArguments(List<ValueExpr> args)
<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

args

protected List<ValueExpr> args

The operator's arguments.

Constructor Details

NAryValueOperator

protected NAryValueOperator()

NAryValueOperator

protected NAryValueOperator(List<ValueExpr> args)

Creates a new N-Ary value operator.

Parameters:

args - The operator's list of arguments, must not be null.

Method Details

setArguments

public void setArguments(List<ValueExpr> args)

getArguments

public List<ValueExpr> getArguments()

addArgument

public void addArgument(ValueExpr arg)

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 other)

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 NAryValueOperator 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.