Reserve a pattern file before conversion.

--HG--
branch : feature

src/libs/ifc/xml/vabstractconverter.cpp

@@ -31,6 +31,7 @@
 #include "exception/vexceptionwrongid.h"
 
 #include <QFile>
+#include <QFileInfo>
 
 //---------------------------------------------------------------------------------------------------------------------
 VAbstractConverter::VAbstractConverter(const QString &fileName)
@@ -57,10 +58,12 @@ void VAbstractConverter::Convert()
     const QString backupFileName = fileName +".backup";
     if (SafeCopy(fileName, backupFileName, error) == false)
     {
-        const QString errorMsg(tr("Error creation backup file: %1.").arg(error));
+        const QString errorMsg(tr("Error creating a backup file: %1.").arg(error));
         throw VException(errorMsg);
     }
 
+    ReserveFile();
+
     ApplyPatches();
 
     QFile file(backupFileName);
@@ -144,6 +147,25 @@ void VAbstractConverter::ValidateVersion(const QString &version) const
     }
 }
 
+//---------------------------------------------------------------------------------------------------------------------
+void VAbstractConverter::ReserveFile() const
+{
+    //It's not possible in all cases make conversion without lose data.
+    //For such cases we will store old version in a reserve file.
+    QString error;
+    QFileInfo info(fileName);
+    const QString reserveFileName = QString("%1/%2(v%3).%4")
+            .arg(info.absoluteDir().absolutePath())
+            .arg(info.baseName())
+            .arg(GetVersionStr())
+            .arg(info.completeSuffix());
+    if (SafeCopy(fileName, reserveFileName, error) == false)
+    {
+        const QString errorMsg(tr("Error creating a reserv copy: %1.").arg(error));
+        throw VException(errorMsg);
+    }
+}
+
 //---------------------------------------------------------------------------------------------------------------------
 void VAbstractConverter::Replace(QString &formula, const QString &newName, int position, const QString &token,
                                  int &bias) const

src/libs/ifc/xml/vabstractconverter.h

@@ -69,6 +69,8 @@ private:
     QString GetVersionStr() const;
 
     void ValidateVersion(const QString &version) const;
+
+    void ReserveFile() const;
 };
 
 #endif // VABSTRACTCONVERTER_H