external data: add initial work for data transformations

Change-Id: I728ca764a2ea2926f8b8f76ea576b8be1091a29a
Reviewed-on: https://gerrit.libreoffice.org/41146Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

sc/Library_sc.mk

@@ -385,6 +385,7 @@ $(eval $(call gb_Library_add_exception_objects,sc,\
     sc/source/ui/condformat/colorformat \
     sc/source/ui/dataprovider/csvdataprovider \
     sc/source/ui/dataprovider/dataprovider \
+    sc/source/ui/dataprovider/datatransformation \
     sc/source/ui/dataprovider/htmldataprovider \
     sc/source/ui/dbgui/asciiopt \
     sc/source/ui/dbgui/consdlg \

sc/source/ui/dataprovider/dataprovider.cxx

@@ -15,6 +15,7 @@
 #include <rtl/strbuf.hxx>
 
 #include "htmldataprovider.hxx"
+#include "datatransformation.hxx"
 
 using namespace com::sun::star;
 
@@ -175,6 +176,12 @@ DataProvider::~DataProvider()
 
 void ScDBDataManager::WriteToDoc(ScDocument& rDoc)
 {
+    // first apply all data transformations
+    for (auto& itr : maDataTransformations)
+    {
+        itr->Transform(rDoc);
+    }
+
     bool bShrunk = false;
     SCCOL nStartCol = 0;
     SCROW nStartRow = 0;
@@ -215,6 +222,11 @@ void ScDBDataManager::SetDatabase(const OUString& rDBName)
     maDBName = rDBName;
 }
 
+void ScDBDataManager::AddDataTransformation(std::unique_ptr<sc::DataTransformation> mpDataTransformation)
+{
+    maDataTransformations.push_back(std::move(mpDataTransformation));
+}
+
 ScDBData* ScDBDataManager::getDBData()
 {
     ScDBData* pDBData = mpDoc->GetDBCollection()->getNamedDBs().findByUpperName(ScGlobal::pCharClass->uppercase(maDBName));

sc/source/ui/dataprovider/datatransformation.cxx

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "datatransformation.hxx"
+
+#include "document.hxx"
+
+namespace sc {
+
+DataTransformation::~DataTransformation()
+{
+}
+
+ColumnRemoveTransformation::ColumnRemoveTransformation(SCCOL nCol):
+    mnCol(nCol)
+{
+}
+
+ColumnRemoveTransformation::~ColumnRemoveTransformation()
+{
+}
+
+void ColumnRemoveTransformation::Transform(ScDocument& rDoc)
+{
+    rDoc.DeleteCol(0, 0, MAXROW, 0, mnCol, 1);
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

sc/source/ui/dataprovider/datatransformation.hxx

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_SC_SOURCE_UI_DATAPROVIDER_DATATRANSFORMATION_HXX
+#define INCLUDED_SC_SOURCE_UI_DATAPROVIDER_DATATRANSFORMATION_HXX
+
+#include <address.hxx>
+
+class ScDocument;
+
+namespace sc {
+
+class DataTransformation
+{
+public:
+    virtual ~DataTransformation();
+
+    virtual void Transform(ScDocument& rDoc) = 0;
+};
+
+class ColumnRemoveTransformation : public DataTransformation
+{
+    SCCOL mnCol;
+
+public:
+
+    ColumnRemoveTransformation(SCCOL nCol);
+    virtual ~ColumnRemoveTransformation() override;
+
+    virtual void Transform(ScDocument& rDoc) override;
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

sc/source/ui/inc/dataprovider.hxx

@@ -28,6 +28,7 @@
 #include <rtl/strbuf.hxx>
 
 #include <queue>
+#include <vector>
 
 #include "officecfg/Office/Calc.hxx"
 
@@ -44,6 +45,7 @@ namespace sc {
 class DataProvider;
 class CSVDataProvider;
 class ScDBDataManager;
+class DataTransformation;
 
 class CSVFetchThread : public salhelper::Thread
 {
@@ -84,7 +86,8 @@ protected:
 
 public:
     DataProvider();
-    virtual ~DataProvider() = 0;
+
+    virtual ~DataProvider();
 
     virtual void Import() = 0;
 
@@ -131,12 +134,16 @@ class ScDBDataManager
     OUString maDBName;
     ScDocument* mpDoc;
 
+    std::vector<std::unique_ptr<sc::DataTransformation>> maDataTransformations;
+
 public:
     ScDBDataManager(const OUString& rDBName, bool bAllowResize, ScDocument* pDoc);
     ~ScDBDataManager();
 
     void SetDatabase(const OUString& rDBName);
 
+    void AddDataTransformation(std::unique_ptr<sc::DataTransformation> mpDataTransformation);
+
     ScDBData* getDBData();
 
     void WriteToDoc(ScDocument& rDoc);
@@ -156,5 +163,6 @@ public:
 };
 
 }
+
 #endif
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */