--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utilities/downloadmanager/inc/downloadbackend.h	Fri Oct 15 17:30:59 2010 -0400
@@ -0,0 +1,111 @@
+/**
+   This file is part of CWRT package **
+
+   Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). **
+
+   This program 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, version 2.1 of the License. 
+   This program 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 program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef DOWNLOADBACKEND_H
+#define DOWNLOADBACKEND_H
+
+#include "dmpimpl.h"
+#include "downloadinfo.h"
+#include "downloadevent.h"
+#include <QObject>
+#include <QNetworkReply>
+
+// forward declarations
+class DownloadBackendPrivate;
+class DownloadCore;
+class Download;
+class ClientDownload;
+
+// class declaration
+class DownloadBackend : public QObject
+{
+    Q_OBJECT
+    DM_DECLARE_PRIVATE(DownloadBackend);
+public:
+    DownloadBackend(DownloadCore *dlCore, ClientDownload *dl);
+    virtual ~DownloadBackend();
+
+    // pauses the download
+    virtual int pause() ;
+    // resumes the download
+    virtual int resume() ;
+    // cancels the download
+    virtual int cancel() ;
+    // fetches the attributes
+    virtual QVariant getAttribute(DownloadAttribute attr);
+    // sets the attributes
+    virtual int setAttribute(DownloadAttribute attr, const QVariant& value);
+    // stores the data in storage
+    // derived classes expected to have their own implementation
+    virtual void store(QByteArray data, bool lastChunk=false) = 0;
+    // deletes the storage
+    // derived classes expected to have their own implementation
+    virtual void deleteStore() = 0;
+    // returns the size of stored data
+    // derived classes expected to have their own implementation
+    virtual qint64 storedDataSize()= 0;
+    //returns the list of child downloads
+    virtual void getChildren(QList<Download*>&) { }
+    // initialises the download by reading from persistant storage
+    virtual void init() { return; }
+
+private: // copy constructor and assaignment operator
+      DownloadBackend(const DownloadBackend &);
+      DownloadBackend &operator=(const DownloadBackend &);
+
+public:
+    // functions which will store and retrieve the download persistant data
+    int setValue(DownloadInfo::Key aKey, const QString& aStrValue);
+    int setValue(DownloadInfo::Key aKey, long aIntValue);
+    int setValue(DownloadInfo::Key aKey, const QList<QVariant>& aChildIds);
+    int setValueForChild(DownloadInfo::Key aKey, const QString& aStrValue, int aChildId = INVALID_DL_ID);
+    int setValueForChild(DownloadInfo::Key aKey, long aIntValue, int aChildId = INVALID_DL_ID);
+
+    int getValue(DownloadInfo::Key aKey, QString& aStrValue);
+    int getValue(DownloadInfo::Key aKey, long& aIntValue);
+    int getValue(DownloadInfo::Key aKey, QList<QVariant>& aChildIds);
+    int getValueForChild(DownloadInfo::Key aKey, QString& aStrValue, int aChildId = INVALID_DL_ID);
+    int getValueForChild(DownloadInfo::Key aKey, long& aIntValue, int aChildId = INVALID_DL_ID);
+
+    // deletes the persistant data of download
+    int deleteInfo();
+    // posts the event to recievers event loop
+    void postEvent(DEventType type, DlEventAttributeMap* attrMap);
+    // download state
+    DownloadState downloadState(void);
+    // sets the download state
+    void setDownloadState(DownloadState state);
+    // sets the current downloaded data size
+    void setDownloadedDataSize(qint64 size);
+    // set total download size
+    void setTotalSize(qint64 size);
+    // returns the download object
+    ClientDownload* download(void);
+    // sets the start time
+    void setStartTime();
+
+private:
+    void postDownloadEvent(DEventType type, DlEventAttributeMap* attrMap);
+
+public slots:
+    virtual void bytesRecieved(qint64 bytesRecieved, qint64 bytesTotal);
+    virtual void handleFinished();
+    virtual void error(QNetworkReply::NetworkError);
+    virtual void headerReceived(){}
+    virtual void bytesUploaded(qint64, qint64){}
+};    
+
+#endif