org.openrdf.query.algebra

Class ArbitraryLengthPath

java.lang.Object

org.openrdf.query.algebra.QueryModelNodeBase

org.openrdf.query.algebra.ArbitraryLengthPath

All Implemented Interfaces:

Serializable, Cloneable, QueryModelNode, TupleExpr

public class ArbitraryLengthPath
extends QueryModelNodeBase
implements TupleExpr

A tuple expression that matches a path of arbitrary length against an RDF graph. They can can be targeted at one of three context scopes: all contexts, null context only, or named contexts only.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ArbitraryLengthPath()
ArbitraryLengthPath(StatementPattern.Scope scope, Var subject, TupleExpr pathExpression, Var object, long minLength) Creates a arbitrary-length path that matches a subject-, predicate- and object variable against statements from the specified context scope.
ArbitraryLengthPath(StatementPattern.Scope scope, Var subjVar, TupleExpr pathExpression, Var objVar, Var conVar, long minLength) Creates a arbitrary-length path that matches a subject-, predicate-, object- and context variable against statements from the specified context scope.
ArbitraryLengthPath(Var subject, TupleExpr pathExpression, Var object, long minLength) Creates a arbitrary-length path that matches a subject-, predicate- and object variable against statements from all contexts.
ArbitraryLengthPath(Var subject, TupleExpr pathExpression, Var object, Var context, long minLength) Creates a arbitrary-length path that matches a subject-, predicate-, object- and context variable against statements from all contexts.

Method Summary

Modifier and Type	Method and Description
ArbitraryLengthPath	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.
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.
Var	getContextVar() Returns the context variable, if available.
long	getMinLength()
Var	getObjectVar()
TupleExpr	getPathExpression()
StatementPattern.Scope	getScope() Gets the context scope for the arbitrary-length path.
String	getSignature() Default implementation of QueryModelNode.getSignature() that prints the name of the node's class.
Var	getSubjectVar()
int	hashCode()
void	replaceChildNode(QueryModelNode current, QueryModelNode replacement) Default implementation of QueryModelNode.replaceChildNode(QueryModelNode, QueryModelNode) that throws an IllegalArgumentException indicating that current is not a child node of this node.
void	setContextVar(Var context)
void	setMinLength(long minLength)
void	setObjectVar(Var object)
void	setPathExpression(TupleExpr pathExpression)
void	setScope(StatementPattern.Scope scope) Sets the context scope for the arbitrary-length path
void	setSubjectVar(Var subject)
<X extends Exception> void	visit(QueryModelVisitor<X> visitor) Visits this node.
<X extends Exception> void	visitChildren(QueryModelVisitor<X> visitor) Dummy implementation of QueryModelNode.visitChildren(org.openrdf.query.algebra.QueryModelVisitor<X>) that does nothing.

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

getParentNode, nullEquals, replaceNodeInList, replaceWith, setParentNode, toString

Methods inherited from class java.lang.Object

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

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

getParentNode, replaceWith, setParentNode, toString

Constructor Detail

ArbitraryLengthPath

public ArbitraryLengthPath()

ArbitraryLengthPath

public ArbitraryLengthPath(Var subject,
                           TupleExpr pathExpression,
                           Var object,
                           long minLength)

Creates a arbitrary-length path that matches a subject-, predicate- and object variable against statements from all contexts.

ArbitraryLengthPath

public ArbitraryLengthPath(StatementPattern.Scope scope,
                           Var subject,
                           TupleExpr pathExpression,
                           Var object,
                           long minLength)

Creates a arbitrary-length path that matches a subject-, predicate- and object variable against statements from the specified context scope.

ArbitraryLengthPath

public ArbitraryLengthPath(Var subject,
                           TupleExpr pathExpression,
                           Var object,
                           Var context,
                           long minLength)

Creates a arbitrary-length path that matches a subject-, predicate-, object- and context variable against statements from all contexts.

ArbitraryLengthPath

public ArbitraryLengthPath(StatementPattern.Scope scope,
                           Var subjVar,
                           TupleExpr pathExpression,
                           Var objVar,
                           Var conVar,
                           long minLength)

Creates a arbitrary-length path that matches a subject-, predicate-, object- and context variable against statements from the specified context scope.

Method Detail

getScope

public StatementPattern.Scope getScope()

Gets the context scope for the arbitrary-length path.

setScope

public void setScope(StatementPattern.Scope scope)

Sets the context scope for the arbitrary-length path

getSubjectVar

public Var getSubjectVar()

setSubjectVar

public void setSubjectVar(Var subject)

getPathExpression

public TupleExpr getPathExpression()

setPathExpression

public void setPathExpression(TupleExpr pathExpression)

getObjectVar

public Var getObjectVar()

setObjectVar

public void setObjectVar(Var object)

setMinLength

public void setMinLength(long minLength)

getMinLength

public long getMinLength()

getContextVar

public Var getContextVar()

Returns the context variable, if available.

setContextVar

public void setContextVar(Var context)

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.

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.

Specified by:

visit in interface QueryModelNode

Throws:

X extends Exception

visitChildren

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

Description copied from class: QueryModelNodeBase

Dummy implementation of QueryModelNode.visitChildren(org.openrdf.query.algebra.QueryModelVisitor<X>) that does nothing. Subclasses should override this method when they have child nodes.

Specified by:

visitChildren in interface QueryModelNode

Overrides:

visitChildren in class QueryModelNodeBase

Throws:

X extends Exception

replaceChildNode

public void replaceChildNode(QueryModelNode current,
                             QueryModelNode replacement)

Description copied from class: QueryModelNodeBase

Default implementation of QueryModelNode.replaceChildNode(QueryModelNode, QueryModelNode) that throws an IllegalArgumentException indicating that current is not a child node of this node.

Specified by:

replaceChildNode in interface QueryModelNode

Overrides:

replaceChildNode in class QueryModelNodeBase

Parameters:

current - The current child node.

replacement - The new child node.

getSignature

public String getSignature()

Description copied from class: QueryModelNodeBase

Default implementation of QueryModelNode.getSignature() that prints the name of the node's class.

Specified by:

getSignature in interface QueryModelNode

Overrides:

getSignature in class QueryModelNodeBase

Returns:

The node's signature, e.g. SLICE (offset=10, limit=10).

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 ArbitraryLengthPath 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 QueryModelNodeBase

Returns:

A deep clone of this query model node.