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68 lines
2.6 KiB
C
68 lines
2.6 KiB
C
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/*
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Copyright 2006-2011 Xavier Guerrin
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This file is part of QElectroTech.
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QElectroTech is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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QElectroTech is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ELEMENTS_COLLECTION_CACHE_H
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#define ELEMENTS_COLLECTION_CACHE_H
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#include <QtCore>
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#include <QtSql>
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#include "elementslocation.h"
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class ElementsCollection;
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class ElementsCategory;
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class ElementDefinition;
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/**
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This class implements a SQLite cache for data related to elements
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collections, mainly names and pixmaps. This avoids the cost of parsing XML
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definitions of elements and building full CustomElement objects when
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(re)loading the elements panel.
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*/
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class ElementsCollectionCache : public QObject {
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public:
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// constructor, destructor
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ElementsCollectionCache(const QString &database_path, QObject * = 0);
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virtual ~ElementsCollectionCache();
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// methods
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public:
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void setLocale(const QString &);
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QString locale() const;
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bool setPixmapStorageFormat(const QString &);
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QString pixmapStorageFormat() const;
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void beginCollection(ElementsCollection *);
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void endCollection(ElementsCollection *);
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bool fetchElement(ElementDefinition *);
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QString name() const;
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QPixmap pixmap() const;
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bool fetchData(const ElementsLocation &);
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bool fetchNameFromCache(const QString &, const QDateTime &);
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bool fetchPixmapFromCache(const QString &, const QDateTime &);
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bool cacheName(const QString &);
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bool cachePixmap(const QString &);
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// attributes
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private:
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QSqlDatabase cache_db_; ///< Object providing access to the SQLite database this cache relies on
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QSqlQuery *select_name_; ///< Prepared statement to fetch names from the cache
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QSqlQuery *select_pixmap_; ///< Prepared statement to fetch pixmaps from the cache
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QSqlQuery *insert_name_; ///< Prepared statement to insert names into the cache
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QSqlQuery *insert_pixmap_; ///< Prepared statement to insert pixmaps into the cache
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QString locale_; ///< Locale to be used when dealing with names
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QString pixmap_storage_format_; ///< Storage format for cached pixmaps
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QString current_name_; ///< Last name fetched
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QPixmap current_pixmap_; ///< Last pixmap fetched
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};
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#endif
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