Package org.eclipse.rdf4j.query.algebra

Class QueryRoot

java.lang.Object

org.eclipse.rdf4j.query.algebra.AbstractQueryModelNode

org.eclipse.rdf4j.query.algebra.UnaryTupleOperator

org.eclipse.rdf4j.query.algebra.QueryRoot

All Implemented Interfaces:

Serializable, Cloneable, GraphPatternGroupable, QueryModelNode, TupleExpr, VariableScopeChange

Direct Known Subclasses:

PrecompiledQueryNode

public class QueryRoot
extends UnaryTupleOperator

A semantics-less query model node that is used as the root of query model trees. This is a placeholder that facilitates modifications to query model trees, including the replacement of the actual (semantically relevant) root node with another root node.

Author:

Arjohn Kampman

See Also:

• Serialized Form

Field Summary

Fields inherited from class org.eclipse.rdf4j.query.algebra.UnaryTupleOperator

arg

Constructor Summary

Constructors

Constructor	Description
QueryRoot()
QueryRoot(TupleExpr tupleExpr)

Method Summary

Modifier and Type	Method	Description
QueryRoot	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.
int	hashCode()
void	setParentNode(QueryModelNode parent)	Sets the node's parent.
<X extends Exception> void	visit(QueryModelVisitor<X> visitor)	Visits this node.

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

getArg, getAssuredBindingNames, getBindingNames, replaceChildNode, setArg, visitChildren

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

getCardinality, getCostEstimate, getParentNode, getResultSizeActual, getResultSizeEstimate, getSignature, getTotalTimeNanosActual, isCardinalitySet, isGraphPatternGroup, isVariableScopeChange, nullEquals, replaceNodeInList, replaceWith, resetCardinality, setCardinality, setCostEstimate, setGraphPatternGroup, 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, setResultSizeActual, setResultSizeEstimate, setTotalTimeNanosActual, toString

Constructor Details

QueryRoot

public QueryRoot()

QueryRoot

public QueryRoot(TupleExpr tupleExpr)

Method Details

setParentNode

public void setParentNode(QueryModelNode parent)

Description copied from interface: QueryModelNode

Sets the node's parent.

Specified by:

setParentNode in interface QueryModelNode

Overrides:

setParentNode in class AbstractQueryModelNode

Parameters:

parent - The parent node for this 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.

Throws:

X

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 UnaryTupleOperator

hashCode

public int hashCode()

Overrides:

hashCode in class UnaryTupleOperator

clone

public QueryRoot 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 UnaryTupleOperator

Returns:

A deep clone of this query model node.