Soprano::Statement Class Reference

A Statement instance represents one RDF quadruple. More...

#include <Soprano/Statement>

List of all members.

Public Member Functions
	Statement (const Statement &other)
	Statement (const Node &subject, const Node &predicate, const Node &object, const Node &context=Node())
	Statement ()
virtual	~Statement ()
Node	context () const
bool	isValid () const
bool	matches (const Statement &other) const
Node	object () const
bool	operator!= (const Statement &other) const
Statement &	operator= (const Statement &other)
bool	operator== (const Statement &other) const
Node	predicate () const
void	setContext (const Node &context)
void	setObject (const Node &object)
void	setPredicate (const Node &predicate)
void	setSubject (const Node &subject)
Node	subject () const

---

Detailed Description

A Statement instance represents one RDF quadruple.

In Soprano statements are quadruples, i.e. in addition to the subject, predicate, and object nodes, they have a fourth node, the context. The context represents the named graph in which the statement is stored. If the context is an empty node the statement is stored in the default graph.

A Statement is valid if subject, predicate, and object are valid. Invalid statements can, however, be used in many methods such as Model::listStatements as wildwards.

See also:

Node

Author:

Daniele Galdi <daniele.galdi@gmail.com>
Sebastian Trueg <trueg@kde.org>

Definition at line 47 of file statement.h.

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Constructor & Destructor Documentation

Soprano::Statement::Statement

(

)

Default Constructor, build an empty (invalid) Statement.

Soprano::Statement::Statement	(	const Node &	subject,
		const Node &	predicate,
		const Node &	object,
		const Node &	context = Node()
	)

Build a Statement with the given subject, predicate and object.

Parameters:

	subject	The subject (cannot be of type Node::LiteralNode)
	predicate	The predicate (has to be of type Node::ResourceNode or Node::EmptyNode)
	object	The object can be of either Node type.
	context	The context node (has to be of type Node::ResourceNode or Node::EmptyNode)

Soprano::Statement::Statement

(

const Statement &

other

)

virtual Soprano::Statement::~Statement

(

)

[virtual]

---

Member Function Documentation

Node Soprano::Statement::context

(

)

const

Returns:

The Context node.

bool Soprano::Statement::isValid

(

)

const

A Statement is valid if the subject is a resource or blank node, the predicate is a resource node, and the object is a valid node.

Returns:

true if the Statement is valid, false otherwise

bool Soprano::Statement::matches

(

const Statement &

other

)

const

Match this statement against template statement other.

The only difference to operator== is that empty nodes are matched as wildcards, i.e. they match any other node.

Be aware that the following is NOT always true since only other is treated a a wildcard:

 // NOT always true:
 a.matches(b) == b.matches(a)

Returns:

true if this statement matches other, false if not.

See also:

Node::matches()

Node Soprano::Statement::object

(

)

const

Returns:

The object.

bool Soprano::Statement::operator!=

(

const Statement &

other

)

const

Statement& Soprano::Statement::operator=

(

const Statement &

other

)

bool Soprano::Statement::operator==

(

const Statement &

other

)

const

Node Soprano::Statement::predicate

(

)

const

Returns:

The predicate.

void Soprano::Statement::setContext

(

const Node &

context

)

Change the Statement context.

Parameters:

context

The new Context.

void Soprano::Statement::setObject

(

const Node &

object

)

Change the Statement object.

Parameters:

object

The new object.

void Soprano::Statement::setPredicate

(

const Node &

predicate

)

Change the Statement predicate.

Parameters:

predicate

The new predicate.

void Soprano::Statement::setSubject

(

const Node &

subject

)

Change the Statement subject.

Parameters:

subject

The new subject.

Node Soprano::Statement::subject

(

)

const

Returns:

The subject.

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The documentation for this class was generated from the following file:

• statement.h