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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_DOCUMENT_H
#define SYNDICATION_RDF_DOCUMENT_H

#include <syndication/rdf/resourcewrapper.h>

#include <syndication/specificdocument.h>

template <class T> class QList;

namespace Syndication {
namespace RDF {

class Document;
class Model;
class DublinCore;
class Image;
class Item;
class SyndicationInfo;
class TextInput;
//@cond PRIVATE
typedef boost::shared_ptr<Document> DocumentPtr;
//@endcond

/**
 * Document implementation for RDF, representing an RSS 1.0 feed.
 *
 * @author Frank Osterfeld
 */
class SYNDICATION_EXPORT Document : public Syndication::SpecificDocument, public ResourceWrapper
{
    friend class ::Syndication::RDF::Model;
    public:

        /**
         * creates a wrapper wrapping a null resource
         */
        Document();
        
        /**
         * creates a document by wrapping a channel resource
         * 
         * @param resource the channel resource to wrap
         */
        explicit Document(ResourcePtr resource);
        
        /**
         * creates a copy of another document
         * 
         * @param other the document to copy
         */
        Document(const Document& other);
        
        /**
         * destructor
         */
        virtual ~Document();

        /**
         * compares two documents. Two documents are equal if they wrap
         * the same resource. See ResourceWrapper::operator==()
         * 
         * @param other the document to compare to
         */
        bool operator==(const Document& other) const;
        
        /**
         * assigns another document
         * 
         * @param other the document to assign
         */
        Document& operator=(const Document& other);
        
        /**
         * Used by visitors for double dispatch. See DocumentVisitor
         * for more information.
         * @param visitor the visitor calling the method
         */
        virtual bool accept(DocumentVisitor* visitor);

        /**
         * returns whether this document is valid or not.
         * Invalid documents do not contain any useful
         * information.
         */
        bool isValid() const;

        /**
         * title of the feed (required)
         *
         * @return feed title as TODO: define format
         */
        QString title() const;
        
        /**
         * A brief description of the channel's content, function, source, etc.
         * 
         * @return TODO: define format etc.
         */
        QString description() const;

        /**
         *  The URL to which an HTML rendering of the channel title will link,
         * commonly the parent site's home or news page.
         */
        QString link() const;

        /**
         * returns a dublin core description of the document.
         */
        DublinCore dc() const;

        /**
         * returns syndication information describing how often this feed
         * is updated.
         */
        SyndicationInfo syn() const;

        /**
         * list of items contained in this feed
         */
        QList<Item> items() const;

        /**
         * An image to be associated with an HTML rendering of the channel.
         */
        Image image() const;

        /**
         * An optional text input element associated with the channel
         */
        TextInput textInput() const;
//@cond PRIVATE
        /**
         * @internal
         * checks the format of titles and returns the results
         * 
         * @param containsMarkup whether the heuristic found HTML markup in
         * titles
         */
        void getItemTitleFormatInfo(bool* containsMarkup) const;

        /**
         * @internal
         * checks the format of descriptions and returns the results
         *
         * @param containsMarkup whether the heuristic found HTML markup in
         * descriptions
         */
        void getItemDescriptionFormatInfo(bool* containsMarkup) const;
//@endcond PRIVATE
        
        /**
         * Returns a description of the document for debugging purposes.
         *
         * @return debug string
         */
        virtual QString debugInfo() const;

    private:
        class Private;
        Private* const d;
};

} // namespace RDF
} // namespace Syndication

#endif //  SYNDICATION_RDF_DOCUMENT_H