classandpropertytree.h

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/*
   This file is part of the Nepomuk KDE project.
   Copyright (C) 2010-2012 Sebastian Trueg <trueg@kde.org>

   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) version 3, or any
   later version accepted by the membership of KDE e.V. (or its
   successor approved by the membership of KDE e.V.), which shall
   act as a proxy defined in Section 6 of version 3 of the license.

   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, see <http://www.gnu.org/licenses/>.
*/

#ifndef CLASSANDPROPERTYTREE_H
#define CLASSANDPROPERTYTREE_H

#include <QtCore/QObject>
#include <QtCore/QUrl>
#include <QtCore/QVariant>
#include <QtCore/QMutex>
#include <QtCore/QList>

#include <Soprano/Error/ErrorCache>

namespace Soprano {
class Model;
class Node;
class Statement;
}


namespace Nepomuk2 {

class SimpleResource;
class SimpleResourceGraph;

class ClassAndPropertyTree : public QObject, public Soprano::Error::ErrorCache
{
    Q_OBJECT

public:
    ClassAndPropertyTree(QObject *parent = 0);
    ~ClassAndPropertyTree();

    bool isKnownClass(const QUrl& uri) const;

    QSet<QUrl> allParents(const QUrl& uri) const;
    QSet<QUrl> allParents(const QList<QUrl>& types) const;
    bool isChildOf(const QUrl& type, const QUrl& superClass) const;

    bool contains(const QUrl& uri) const;

    bool isChildOf(const QList<QUrl> & types, const QUrl& superClass) const;
    int maxCardinality(const QUrl& type) const;

    QUrl propertyDomain(const QUrl& uri) const;
    QUrl propertyRange(const QUrl& uri) const;

    bool hasLiteralRange(const QUrl& uri) const;

    bool isDefiningProperty(const QUrl& uri) const;

    Soprano::Node variantToNode(const QVariant& value, const QUrl& property) const;
    QSet<Soprano::Node> variantListToNodeSet(const QVariantList& vl, const QUrl& property) const;

    static ClassAndPropertyTree* self();

public Q_SLOTS:
    void rebuildTree(Soprano::Model* model);

private:
    class ClassOrProperty;

    const ClassOrProperty* findClassOrProperty(const QUrl& uri) const;
    int updateDefining(ClassOrProperty* cop, QSet<QUrl>& definingNodes);
    QSet<QUrl> getAllParents(ClassOrProperty *cop, QSet<QUrl> &visitedNodes);

    QHash<QUrl, ClassOrProperty*> m_tree;

    // TODO: Convert to read/write lock
    mutable QMutex m_mutex;

    static ClassAndPropertyTree* s_self;
};
}

#endif