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/*
 * This file is part of the syndication library
 *
 * Copyright (C) 2006 Frank Osterfeld <osterfeld@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 SYNDICATION_RDF_SEQUENCE_H
#define SYNDICATION_RDF_SEQUENCE_H

#include <syndication_export.h>
#include <syndication/rdf/resource.h>

template <class T> class QList;

namespace Syndication
{
namespace RDF
{

//@cond PRIVATE
class Sequence;
typedef QSharedPointer<Sequence> SequencePtr;
//@endcond

/**
 * Sequence container, a sequence contains an ordered list
 * of RDF nodes. (opposed to the usually unordered graph
 * structure)
 */
class SYNDICATION_EXPORT Sequence : public Resource
{
public:

    /**
     * creates a null sequence
     */
    Sequence();

    /**
     * creates a sequence with the given URI. Do not use this directly,
     * use Model::createSequence() instead.
     */
    explicit Sequence(const QString &uri);

    /**
     * copies a sequence
     *
     * @param other sequence
     */
    Sequence(const Sequence &other);

    /**
     * destructor
     */
    virtual ~Sequence();

    /**
     * assigns another sequence
     *
     * @param other the sequence to assign
     */
    virtual Sequence &operator=(const Sequence &other);

    /**
    * Used by visitors for double dispatch. See NodeVisitor
    * for more information.
    * @param visitor the visitor calling the method
    * @param ptr a shared pointer object for this node
    */
    void accept(NodeVisitor *visitor, NodePtr ptr) Q_DECL_OVERRIDE;

    /**
     * creates a copy of the sequence
     */
    Sequence *clone() const Q_DECL_OVERRIDE;

    /**
     * appends a node at the end of the sequence
     *
     * @param node the RDF node to append to the sequence
     */
    virtual void append(NodePtr node);

    /**
     * the list of the list items in the sequence, in the
     * specified order
     */
    virtual QList<NodePtr> items() const;

    /**
     * returns @p true
     */
    bool isSequence() const Q_DECL_OVERRIDE;

private:

    class SequencePrivate;
    QSharedPointer<SequencePrivate> d;
};

} // namespace RDF
} // namespace Syndication

#endif // SYNDICATION_RDF_SEQUENCE_H