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/*
<one line to give the library's name and an idea of what it does.>
Copyright (C) 2011 Vishesh Handa <handa.vish@gmail.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef NEPOMUK_DATAMANAGEMENT_RESOURCEMERGER_H
#define NEPOMUK_DATAMANAGEMENT_RESOURCEMERGER_H
#include <QtCore/QHash>
#include <QtCore/QVariant>
#include <QtCore/QUrl>
#include <QtCore/QSet>
#include <KUrl>
#include <Soprano/Error/ErrorCache>
#include "datamanagement.h"
namespace Soprano {
class Node;
class Statement;
class Graph;
}
namespace Nepomuk {
class DataManagementModel;
class ResourceWatcherManager;
class ResourceMerger : public Soprano::Error::ErrorCache
{
public:
ResourceMerger( Nepomuk::DataManagementModel * model, const QString & app,
const QHash<QUrl, QVariant>& additionalMetadata,
const StoreResourcesFlags& flags );
virtual ~ResourceMerger();
void setMappings( const QHash<QUrl, QUrl> & mappings );
QHash<QUrl, QUrl> mappings() const;
bool merge(const Soprano::Graph& graph);
void setAdditionalGraphMetadata( const QHash<QUrl, QVariant>& additionalMetadata );
QHash<QUrl, QVariant> additionalMetadata() const;
private:
virtual QUrl createGraph();
virtual QUrl createResourceUri();
virtual QUrl createGraphUri();
virtual Soprano::Error::ErrorCode addResMetadataStatement( const Soprano::Statement & st );
bool push( const Soprano::Statement & st );
//
// Resolution
//
Soprano::Statement resolveStatement( const Soprano::Statement& st );
Soprano::Node resolveMappedNode( const Soprano::Node& node );
Soprano::Node resolveUnmappedNode( const Soprano::Node& node );
/// This modifies the list
void resolveBlankNodesInSet( QSet<Soprano::Statement> *stList );
/**
* Removes all the statements that already exist in the model
* and adds them to m_duplicateStatements
*/
void removeDuplicatesInList( QSet<Soprano::Statement> *stList );
QMultiHash<QUrl, Soprano::Statement> m_duplicateStatements;
QHash<QUrl, QUrl> m_mappings;
/// a set of graphs which we change and which are candidates for empty graphs
QSet<QUrl> m_trailingGraphCandidates;
/// a list of all the statements that have been removed (only used for the resource watcher)
QList<Soprano::Statement> m_removedStatements;
/// Can set the error
QMultiHash<QUrl, Soprano::Node> toNodeHash( const QHash<QUrl, QVariant> &hash );
/**
* Each statement that is being merged and already exists, belongs to a graph. This hash
* maps that oldGraph -> newGraph.
* The newGraph is generated by mergeGraphs, and contains the metdata from the oldGraph
* and the additionalMetadata provided.
*
* \sa mergeGraphs
*/
QHash<QUrl, QUrl> m_graphHash;
QHash<QUrl, Soprano::Node> m_additionalMetadataHash;
QHash<QUrl, QVariant> m_additionalMetadata;
QString m_app;
QUrl m_appUri;
QUrl m_graph;
StoreResourcesFlags m_flags;
Nepomuk::DataManagementModel * m_model;
QUrl mergeGraphs( const QUrl& oldGraph );
QList<QUrl> existingTypes( const QUrl& uri ) const;
/**
* Checks if \p node is of rdf:type \p type.
*
* \param newTypes contains additional types that should be considered as belonging to \p node
*/
bool isOfType( const Soprano::Node& node, const QUrl& type, const QList<QUrl>& newTypes = QList<QUrl>() ) const;
QMultiHash<QUrl, Soprano::Node> getPropertyHashForGraph( const QUrl & graph ) const;
bool checkGraphMetadata( const QMultiHash<QUrl, Soprano::Node> & hash );
bool areEqual( const QMultiHash<QUrl, Soprano::Node>& oldPropHash,
const QMultiHash<QUrl, Soprano::Node>& newPropHash );
/**
* Returns true if all the types in \p types are present in \p masterTypes
*/
bool containsAllTypes( const QSet<QUrl>& types, const QSet<QUrl>& masterTypes );
/// Refers to the properties which are considered as resource metadata
QSet<QUrl> metadataProperties;
ResourceWatcherManager *m_rvm;
};
}
#endif // NEPOMUK_DATAMANAGEMENT_RESOURCEMERGER_H
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