org.openrdf.query.algebra
Class QueryRoot

java.lang.Object
  org.openrdf.query.algebra.QueryModelNodeBase
      org.openrdf.query.algebra.UnaryTupleOperator
          org.openrdf.query.algebra.QueryRoot

All Implemented Interfaces:

Cloneable, QueryModelNode, TupleExpr

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

Field Summary

Fields inherited from class org.openrdf.query.algebra.UnaryTupleOperator

arg

Constructor Summary

QueryRoot()

QueryRoot(TupleExpr tupleExpr)

Method Summary

QueryRoot	clone() Returns a (deep) clone of this query model node.
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.openrdf.query.algebra.UnaryTupleOperator

getArg, getBindingNames, replaceChildNode, setArg, visitChildren

Methods inherited from class org.openrdf.query.algebra.QueryModelNodeBase

getParentNode, getSignature, replaceWith, toString

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.openrdf.query.algebra.QueryModelNode

getParentNode, getSignature, replaceWith, toString

Constructor Detail

QueryRoot

public QueryRoot()

QueryRoot

public QueryRoot(TupleExpr tupleExpr)

Method Detail

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 QueryModelNodeBase

Parameters:

parent - The parent node for this node.

visit

public <X extends Exception> void visit(QueryModelVisitor<X> visitor)
           throws X extends Exception

Description copied from interface: QueryModelNode

Visits this node. The node reports itself to the visitor with the proper runtime type.

Throws:

X extends Exception

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.