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 /* This file is part of the KDE project
    Copyright (C) 2010 KO GmbH <ben.martin@kogmbh.com>
 
    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 __rdf_KoSopranoTableModel_h__
 #define __rdf_KoSopranoTableModel_h__
 
 #include <QAbstractTableModel>
 #include <QSharedPointer>
 #include <Soprano/Soprano>
 
 class KoDocumentRdf;
 
 /**
  * @short custom TableModel for editing a Soprano::Model
  * @author Ben Martin <ben.martin@kogmbh.com>
  * @see KoDocumentRdf
  *
  * Various columns are exposed to allow editing of not only
  * the triple itself but also the object type, data type,
  * and storage location of the triple.
  */
 class KoSopranoTableModel : public QAbstractTableModel
 {
     KoDocumentRdf *m_rdf;
     /**
      * Because we need to be able to lookup triples by
      * row number, a QList is created giving efficient index
      * lookup for statements. Note that Soprano::Statement
      * uses pimpl so we are not really copying statements here.
      */
     QList<Soprano::Statement> m_statementIndex;
 
     /**
      * True if the statement is stored in content.xml
      */
     bool isInlineRdf(const Soprano::Statement &st) const;
 
 public:
 
     explicit KoSopranoTableModel(KoDocumentRdf *rdf);
 
     /**
      * Get the RDF model we this class is showing.
      * You should not delete the return value.
      */
     QSharedPointer<Soprano::Model> model() const;
 
     enum {
         ColIsValid = 0,  // Is this triple valid
         ColSubj,         // subject
         ColPred,         // predicate
         ColObj,          // object
         ColObjType,      // string for type, eg, URI, Literal, Blank Node
         ColObjXsdType,   // XSD type URI for object
         ColCtx,          // Graph context for triple
         ColCount         // NOT A COLUMN but the size.
     };
 
     /**
      * Convenience method, same as m_rdf->getPrefixMapping()
      */
     QString URItoPrefexedLocalname(const QString &uri) const;
     /**
      * Convenience method, same as m_rdf->getPrefixMapping()
      */
     QString PrefexedLocalnameToURI(const QString &pname);
 
     virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
     virtual int rowCount(const QModelIndex &parent = QModelIndex()) const;
     int columnCount(const QModelIndex &parent = QModelIndex()) const;
     QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
     Qt::ItemFlags flags(const QModelIndex &index) const;
 
     /**
      * You MUST use this method if you want to change a Statement.
      *
      * Used by setData() to remove the old statement and replace it with the new 'n' one.
      * The internal m_statementIndex int->statement is updated
      * as well as the dataChanged signal emitted
      */
     bool setDataUpdateTriple(const QModelIndex &index, const Soprano::Statement &old, const Soprano::Statement &n);
     bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);
 
     /**
      * Add the statement 'st' to the model as the new last row.
      */
     int insertStatement(const Soprano::Statement &st);
 
     /**
      * Copy all the triples in srclist to be new rows in the model.
      * Note that the object value is modified to contain a unique
      * postfix so that the new triple copies can be inserted into
      * the Rdf model. It is a copy in a looser sense of the word.
      */
     QModelIndexList copyTriples(const QModelIndexList &srclist);
 
     /**
      * Delete all the triples in srclist from the model.
      */
     void deleteTriples(const QModelIndexList &srclist);
 
     /**
      * Find the statement at the given row.
      */
     Soprano::Statement statementAtIndex(const QModelIndex &mi) const;
 
     /**
      * The number of statements that have been partially or invalidly
      * edited.
      *
      * @see invalidStatementList()
      */
     int invalidStatementCount() const;
 
     /**
      * All the statements in the UI which are not valid Soprano::Statements
      *
      * @see invalidStatementCount()
      */
     QModelIndexList invalidStatementList() const;
 };
 
 #endif