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List:       nepomuk
Subject:    Re: [Nepomuk] Activities and desktop events - Results from
From:       Sebastian Trüg <trueg () kde ! org>
Date:       2010-08-03 18:28:43
Message-ID: 4C585FDB.9070301 () kde ! org
[Download RAW message or body]

On 08/03/2010 06:20 PM, Ivan Čukić wrote:
>> - only resources that have an event related to the app
> 
> ^^ to be used instead of the 'recently opened documents'

ok

>> both do not really seem useful though as IMHO there would be too many
>> false-negatives.
> 
> If the app uses this system to notify us of open/modify/close events,
> there wouldn't be any false-negatives. If not, then it can't really
> expect the above to work.

ok

>> please check the attached header and tell me if the API is acceptable. I
>> did not define special standard queries for "fav res of type X" since
>> that ca easily be done via:
> 
> How do we get MostImportantResources for a specific activity?
> Intersecting the results of MIR and
> resources-related-to-DE-related-to-activity?

See the attached second version. It includes a Term parameter for the
standard queries which allows to specify the activity. I used a Term
instead of a Resource to be open for future queries that might be
parametrized differently. What do you think of that?

And I also added a hint as to how standard queries can be combined to
get the desired behavior.

Cheers,
Sebastian

["standardqueries.h" (text/x-c)]

/*
   This file is part of the Nepomuk KDE project.
   Copyright (C) 2010 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 _NEPOMUK_STANDARD_QUERIES_H_
#define _NEPOMUK_STANDARD_QUERIES_H_

#include "nepomukquery_export.h"

#include <QtCore/QDate>

namespace Nepomuk {
    namespace Query {
        class Query;

        /**
         * A set of predefined queries that can be created vis standardQuery().
         *
         * \since 4.6
         */
        enum StandardQuery {
            /**
             * Creates a query that returns all files sorted by descending \
                modification date.
             *
             * The subterm parameter can be used to specify an application \
                restricting the results
             * to files created/opened with that application.
             */
            LastModifiedFilesQuery,

            /**
             * Creates a query that returns all resources sorted by descending score \
                (as calculated
             * by the DataMaintenanceService)
             *
             * The subterm parameter can be used to specify an application \
                restricting the results
             * to files created/opened with that application.
             */
            MostImportantResourcesQuery,

            /**
             * Creates a query that returns all files with a usage count of 0
             * sorted by descending modification date.
             */
            NeverOpenedFilesQuery,

            /**
             * Get the resources related to a specific activity. Use a ResourceTerm \
                referring to
             * the activity as parameter in standardQuery.
             */
            ResourcesForActivityQuery
        };


        /**
         * Modificators to influence the behaviour of dateRangeQuery().
         *
         * \since 4.6
         */
        enum DateRangeFlag {
            /**
             * Query for the modification date (nie:lastModified)
             */
            ModificationDate = 0x1,

            /**
             * Query for the content creation date (nie:contentCreated)
             */
            ContentDate = 0x2,

            /**
             * Query for usage events referring to the resource.
             */
            UsageDate = 0x4,

            /**
             * Query for all possible dates.
             */
            AllDates = ModificationDate|ContentDate|UsageDate
        };
        Q_DECLARE_FLAGS( DateRangeFlags, DateRangeFlag )

        /**
         * Create a standard query as defined by \p query.
         *
         * \param query The query to be generated. See StandardQuery.
         * \param subterm An optional subterm used for specific types of standard \
                queries that need
         * a parameter like ResourcesForActivityQuery.
         *
         * To get a query that only returns files (this is already true for some of \
                the predefined queries)
         * use something like the following:
         *
         * \code
         * Query::FileQuery query = Query::standardQuery( \
                Query::LastModifiedFilesQuery );
         * \endcode
         *
         * Be aware that queries can be combined. One can for example get the most \
                important files related
         * to an activity as follows:
         *
         * \code
         * Query query = Query::standardQuery( Query::ResourcesForActivityQuery, \
                myActivity )
         *     && Query::standardQuery( Query::MostImportantResourcesQuery );
         * \endcode
         *
         * \since 4.6
         */
        NEPOMUK_QUERY_EXPORT Query standardQuery( StandardQuery query, const Term& \
subterm = Term() );

        /**
         * Create a query that returns resources/files that have been \
                modified/accessed in the range
         * from \p start to \p end. The flags specified in \p dateFlags can be used \
                to influence the
         * type of dates that are queried.
         *
         * \since 4.6
         */
        NEPOMUK_QUERY_EXPORT Query dateRangeQuery( const QDate& start, const QDate& \
end, DateRangeFlags dateFlags = AllDates );  }
}

Q_DECLARE_OPERATOR_FOR_FLAGS( Nepomuk::Query::DateRangeFlags )

#endif



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