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* This file is part of Soprano Project.
*
* Copyright (C) 2007 Sebastian Trueg <trueg@kde.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef _SOPRANO_INFERENCE_MODEL_H_
#define _SOPRANO_INFERENCE_MODEL_H_
#include "filtermodel.h"
#include "soprano_export.h"
class QUrl;
namespace Soprano {
class Statement;
namespace Inference {
class Rule;
/**
* \class InferenceModel inferencemodel.h Soprano/Inference/InferenceModel
*
* \brief The Soprano Inference Model provides a simple forward chaining inference engine
* which uses the underlying parent model itself to store status information.
*
* The InferenceModel does perfect inference which means that removing of statements is supported
* and results in a perfect update of the infered statements. There is only one exception:
* If a model contains two statements in different named graphs that both have the same subject,
* predicate, and object and trigger one rule then if one of these statements is removed the
* infered statements are removed, too, although the second statement would still make the infered
* one valid. This situation gets resolved once the same rule is triggered again by some other
* added statement or performInference gets called.
*
* The inference is performed based on rules which are stored in Rule instances.
* Rules can be created manually or parsed using a RuleParser.
*
* <b>The inference engine works roughly as follows:</b>
*
* Whenever a new statement is added it is compared to each rule to check if it could trigger this rule.
* Then if it could trigger a rule this rule is applied to the whole model.
*
* If a rule produces a new infered statement the following data is created:
* \li named graph A containing the infered statements
* \li the statements that triggered the rule are stored in named graph sil:InferenceMetadata as
* source statements of A (sil:sourceStatement). The inference model supports two ways of storing
* source statements: plain and compressed (see setCompressedSourceStatements).
*
* Thus, when removing a statement it can easily be checked if this statement had been used to
* infer another one by querying all named graphs that have this statement as a source statement.
*
* \author Sebastian Trueg <trueg@kde.org>
*/
class SOPRANO_EXPORT InferenceModel : public FilterModel
{
Q_OBJECT
public:
InferenceModel( Model* parent );
~InferenceModel();
/**
* Add a new statement to the model. Inferencing will be done directly.
* Inferenced statements are stored in additional named graphs.
*/
Error::ErrorCode addStatement( const Statement& );
/**
* Remove one statement from the model.
*/
Error::ErrorCode removeStatement( const Statement& );
/**
* Remove statements from the model.
*/
Error::ErrorCode removeAllStatements( const Statement& );
/**
* Add an inference rule to the set of rules.
* This method will not trigger any inference action. If inference
* is necessary call performInference() after adding the new rules.
*/
void addRule( const Rule& );
/**
* Set the inference rules to be used.
* This method will not trigger any inference action. If inference
* is necessary call performInference() after adding the new rules.
*/
void setRules( const QList<Rule>& rules );
using FilterModel::addStatement;
using FilterModel::removeStatement;
using FilterModel::removeAllStatements;
public Q_SLOTS:
/**
* Normally inferencing is done once new statements are added to the model or
* statements are removed. This method performs inferencing on the whole model.
* It is useful for initializing a model that already contains statements or
* update the model if it has been modified bypassing this filter model.
*
* Tha latter can easily be done by connecting the Model::statementsAdded and
* Model::statementsRemoved signals to this slot.
*/
void performInference();
/**
* Removes all statements infered by this model.
* This can be useful if the parent model has been changed without informing
* the inference model and statements have been removed.
*/
void clearInference();
/**
* If compressed statements are enabled source statements are stored compressed
* in one literal value. Otherwise source statements are stored using rdf:subject,
* rdf:predicate, rdf:object, and sil:context. Non-compressed statements are much
* cleaner from an ontology design point of view while compressed statements take
* much less space.
*
* By default comressed source statements are enabled.
*
* This method exists mainly for historical reasons and there normally is no need
* to call it. Compressed statements should work well for most users.
*
* \param b If true compressed source statements are enabled (the default).
*/
void setCompressedSourceStatements( bool b );
/**
* If the storage backend supports joined SPARQL queries via UNION
* it makes sense to enable this.
*
* \param b If true InferenceModel will use optimized queries for
* the inference during addStatement. This will speed up the
* process quite a lot as matching rules are only applied to the new statement.
* This flag has no influcence on performInference() though.
*
* The default is to disable the optimized queries since the default
* soprano redland backend does not support UNION.
*/
void setOptimizedQueriesEnabled( bool b );
private:
/**
* Create all infered statements that result from adding statement. Calls inferRule.
*
* \param statement The new statement, only matching rules will be recalculated.
* \param recurse If true inferred statements will recursively triggeer inferStatement.
*
* \return the number of new statements infered.
*/
int inferStatement( const Statement& statement, bool recurse = false );
/**
* Create all infered statements that result from applying rule to the model.
*
* \param rule The rule to apply.
* \param recurse If true inferred statements will recursively triggeer inferStatement.
*
* \return the number of new statements infered.
*/
int inferRule( const Rule& rule, bool recurse );
/**
* Get a list of all inference graphs (i.e. graphs that contain infered statements) that have statement
* as a source.
*/
QList<Node> inferedGraphsForStatement( const Statement& statement ) const;
/**
* Create the statements to store an uncompressed source statement and add them to the parent model.
* \return The URI of the uncompressed source statement resource.
*/
QUrl storeUncompressedSourceStatement( const Statement& sourceStatement );
class Private;
Private* const d;
};
}
}
#endif
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