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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_SYNDICATIONINFO_H
#define SYNDICATION_RDF_SYNDICATIONINFO_H

#include <syndication/rdf/resourcewrapper.h>

#include <ctime>

class QString;

namespace Syndication {
namespace RDF {

/**
 * Wrapper to access syndication information for a feed.
 * The RSS 1.0 syndication module provides syndication hints to
 * aggregators regarding how often it is updated.
 *
 * The specification can be found at
 * http://web.resource.org/rss/1.0/modules/syndication/
 *
 * @author Frank Osterfeld
 */
class SYNDICATION_EXPORT SyndicationInfo : public ResourceWrapper
{
    public:

        /**
         * update period enum as used by updatePeriod().
         */
        enum Period
        {
            Hourly, /**< the feed is updated hourly */
            Daily, /**< the feed is updated daily */
            Weekly, /**< the feed is updated weekly */
            Monthly, /**< the feed is updated monthly */
            Yearly /**< the feed is updated yearly */
        };

        /**
         * creates a wrapper wrapping a null resource.
         * isNull() will be true.
         */
        SyndicationInfo();

        /**
         * creates a wrapper from a resource
         * @param resource the feed resource to read syndication
         * information from
         */
        explicit SyndicationInfo(ResourcePtr resource);

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

        /**
         * Describes the period over which the channel format is updated.
         * Acceptable values are: hourly, daily, weekly, monthly, yearly.
         * If omitted, daily is assumed.
         *
         * @return update period, daily is default
         */
        Period updatePeriod() const;

        /** Used to describe the frequency of updates in relation to the
         * update period. A positive integer indicates how many times in
         * that period the channel is updated. For example, an
         * updatePeriod of daily, and an updateFrequency of 2 indicates
         * the channel format is updated twice daily. If omitted a value
         * of 1 is assumed.
         *
         * @return update frequency, default is 1
         */
        int updateFrequency() const;

        /**
         * Defines a base date to be used in concert with updatePeriod
         * and updateFrequency to calculate the publishing schedule.
         *
         * @return the base date in seconds since epoch. Default value is
         * 0 (epoch).
         */
        time_t updateBase() const;

        /**
         * description of the syndication information
         * for debugging purposes
         *
         * @return debug string
         */
        QString debugInfo() const;

    protected:

        /**
         * returns Period value as string.
         * @param period period enum to convert to a string
         * @return the enum name in lower case, "daily", "hourly", etc.
         */
        static QString periodToString(Period period);

        /**
         * parses a Period value from a string.
         *
         * @param str a period string as defined in the syndication module
         * @return the parsed period, Daily (the default) if the parsed
         * string is empty or invalid
         */
        static Period stringToPeriod(const QString& str);
};

} // namespace RDF
} // namespace Syndication

#endif // SYNDICATION_RDF_SYNDICATIONINFO_H