loplugin:constparams in oox

Change-Id: I43984b4ece82da39ca61a91fa14e4660298509dd
Reviewed-on: https://gerrit.libreoffice.org/40581
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

28 files changed, 51 insertions, 51 deletions

diff --git a/include/oox/core/contexthandler2.hxx b/include/oox/core/contexthandler2.hxx
index b08dd937226f..c14ddcd62ada 100644
--- a/include/oox/core/contexthandler2.hxx
+++ b/include/oox/core/contexthandler2.hxx
@@ -226,7 +226,7 @@ protected:
 class OOX_DLLPUBLIC ContextHandler2 : public ContextHandler, public ContextHandler2Helper
 {
 public:
-    explicit            ContextHandler2( ContextHandler2Helper& rParent );
+    explicit            ContextHandler2( ContextHandler2Helper const & rParent );
     virtual             ~ContextHandler2() override;
 
     // resolve ambiguity from base classes
diff --git a/include/oox/core/filterbase.hxx b/include/oox/core/filterbase.hxx
index 6c2ffb04fd15..dcbebc122309 100644
--- a/include/oox/core/filterbase.hxx
+++ b/include/oox/core/filterbase.hxx
@@ -196,7 +196,7 @@ public:
 
     /** Imports the raw binary data from the specified stream.
         @return  True, if the data could be imported from the stream. */
-    bool                importBinaryData( StreamDataSequence& orDataSeq, const OUString& rStreamName );
+    bool                importBinaryData( StreamDataSequence const & orDataSeq, const OUString& rStreamName );
 
     // com.sun.star.lang.XServiceInfo interface -------------------------------
 
diff --git a/include/oox/crypto/DocumentDecryption.hxx b/include/oox/crypto/DocumentDecryption.hxx
index fbd5e36eb747..852dd9035c9f 100644
--- a/include/oox/crypto/DocumentDecryption.hxx
+++ b/include/oox/crypto/DocumentDecryption.hxx
@@ -49,7 +49,7 @@ private:
     std::unique_ptr<CryptoEngine>   mEngine;
     CryptoType                      mCryptoType;
 
-    bool readAgileEncryptionInfo( css::uno::Reference< css::io::XInputStream >& rStream );
+    bool readAgileEncryptionInfo( css::uno::Reference< css::io::XInputStream > const & rStream );
     bool readStandard2007EncryptionInfo( BinaryInputStream& rStream );
 
 public:
diff --git a/include/oox/drawingml/connectorshapecontext.hxx b/include/oox/drawingml/connectorshapecontext.hxx
index 57982230bc34..15d07e2366d2 100644
--- a/include/oox/drawingml/connectorshapecontext.hxx
+++ b/include/oox/drawingml/connectorshapecontext.hxx
@@ -34,7 +34,7 @@ namespace oox { namespace drawingml {
 class OOX_DLLPUBLIC ConnectorShapeContext : public ShapeContext
 {
 public:
-    ConnectorShapeContext( ::oox::core::ContextHandler2Helper& rParent, const ShapePtr& pMasterShapePtr, const ShapePtr& pGroupShapePtr );
+    ConnectorShapeContext( ::oox::core::ContextHandler2Helper const & rParent, const ShapePtr& pMasterShapePtr, const ShapePtr& pGroupShapePtr );
     virtual ~ConnectorShapeContext() override;
     virtual ::oox::core::ContextHandlerRef onCreateContext( ::sal_Int32 Element, const ::oox::AttributeList& rAttribs ) override;
 };
diff --git a/include/oox/drawingml/graphicshapecontext.hxx b/include/oox/drawingml/graphicshapecontext.hxx
index 403fdea79018..5b520e468089 100644
--- a/include/oox/drawingml/graphicshapecontext.hxx
+++ b/include/oox/drawingml/graphicshapecontext.hxx
@@ -36,7 +36,7 @@ namespace oox { namespace drawingml {
 class OOX_DLLPUBLIC GraphicShapeContext : public ShapeContext
 {
 public:
-    GraphicShapeContext( ::oox::core::ContextHandler2Helper& rParent, const ShapePtr& pMasterShapePtr, const ShapePtr& pShapePtr );
+    GraphicShapeContext( ::oox::core::ContextHandler2Helper const & rParent, const ShapePtr& pMasterShapePtr, const ShapePtr& pShapePtr );
 
     virtual ::oox::core::ContextHandlerRef onCreateContext( ::sal_Int32 Element, const ::oox::AttributeList& rAttribs ) override;
 };
@@ -59,7 +59,7 @@ private:
 class OleObjectGraphicDataContext : public ShapeContext
 {
 public:
-    OleObjectGraphicDataContext( ::oox::core::ContextHandler2Helper& rParent, const ShapePtr& pShapePtr );
+    OleObjectGraphicDataContext( ::oox::core::ContextHandler2Helper const & rParent, const ShapePtr& pShapePtr );
     virtual ~OleObjectGraphicDataContext() override;
     virtual ::oox::core::ContextHandlerRef onCreateContext( ::sal_Int32 Element, const ::oox::AttributeList& rAttribs ) override;
 
@@ -72,7 +72,7 @@ class DiagramGraphicDataContext
     : public ShapeContext
 {
 public:
-    DiagramGraphicDataContext( ::oox::core::ContextHandler2Helper& rParent, const ShapePtr& pShapePtr );
+    DiagramGraphicDataContext( ::oox::core::ContextHandler2Helper const & rParent, const ShapePtr& pShapePtr );
     virtual ~DiagramGraphicDataContext() override;
     virtual ::oox::core::ContextHandlerRef onCreateContext( ::sal_Int32 Element, const ::oox::AttributeList& rAttribs ) override;
 
@@ -90,7 +90,7 @@ class ChartGraphicDataContext : public ShapeContext
 {
 public:
     explicit            ChartGraphicDataContext(
-                            ::oox::core::ContextHandler2Helper& rParent,
+                            ::oox::core::ContextHandler2Helper const & rParent,
                             const ShapePtr& rxShape, bool bEmbedShapes );
 
     virtual ::oox::core::ContextHandlerRef
diff --git a/include/oox/drawingml/shape.hxx b/include/oox/drawingml/shape.hxx
index c98bf4e3f254..9f16113b2ac5 100644
--- a/include/oox/drawingml/shape.hxx
+++ b/include/oox/drawingml/shape.hxx
@@ -182,7 +182,7 @@ public:
                             ::oox::core::XmlFilterBase& rFilterBase,
                             const Theme* pTheme,
                             const css::uno::Reference< css::drawing::XShapes >& rxShapes,
-                            basegfx::B2DHomMatrix& aTransformation );
+                            basegfx::B2DHomMatrix const & aTransformation );
 
     void                setXShape( const css::uno::Reference< css::drawing::XShape >& rXShape )
                             { mxShape = rXShape; };
@@ -233,10 +233,10 @@ protected:
                             ShapeIdMap* pShapeMap,
                             const basegfx::B2DHomMatrix& aTransformation );
 
-    void                keepDiagramCompatibilityInfo( ::oox::core::XmlFilterBase& rFilterBase );
+    void                keepDiagramCompatibilityInfo( ::oox::core::XmlFilterBase const & rFilterBase );
 
     css::uno::Reference< css::drawing::XShape >
-                        renderDiagramToGraphic( ::oox::core::XmlFilterBase& rFilterBase );
+                        renderDiagramToGraphic( ::oox::core::XmlFilterBase const & rFilterBase );
 
     OUString finalizeServiceName(
                             ::oox::core::XmlFilterBase& rFilter,
diff --git a/include/oox/drawingml/shapecontext.hxx b/include/oox/drawingml/shapecontext.hxx
index e745b9723469..b06ac38ed21d 100644
--- a/include/oox/drawingml/shapecontext.hxx
+++ b/include/oox/drawingml/shapecontext.hxx
@@ -33,7 +33,7 @@ namespace oox { namespace drawingml {
 class OOX_DLLPUBLIC ShapeContext : public ::oox::core::ContextHandler2
 {
 public:
-    ShapeContext( ::oox::core::ContextHandler2Helper& rParent, ShapePtr const & pMasterShapePtr, ShapePtr const & pShapePtr );
+    ShapeContext( ::oox::core::ContextHandler2Helper const & rParent, ShapePtr const & pMasterShapePtr, ShapePtr const & pShapePtr );
     virtual ~ShapeContext() override;
 
     virtual ::oox::core::ContextHandlerRef onCreateContext( ::sal_Int32 Element, const ::oox::AttributeList& rAttribs ) override;
diff --git a/include/oox/drawingml/shapegroupcontext.hxx b/include/oox/drawingml/shapegroupcontext.hxx
index d66457a566b9..c273d9c03263 100644
--- a/include/oox/drawingml/shapegroupcontext.hxx
+++ b/include/oox/drawingml/shapegroupcontext.hxx
@@ -33,7 +33,7 @@ namespace oox { namespace drawingml {
 class OOX_DLLPUBLIC ShapeGroupContext : public ::oox::core::ContextHandler2
 {
 public:
-    ShapeGroupContext( ::oox::core::ContextHandler2Helper& rParent, ShapePtr const & pMasterShapePtr, ShapePtr const & pGroupShapePtr );
+    ShapeGroupContext( ::oox::core::ContextHandler2Helper const & rParent, ShapePtr const & pMasterShapePtr, ShapePtr const & pGroupShapePtr );
     virtual ~ShapeGroupContext() override;
     virtual ::oox::core::ContextHandlerRef onCreateContext( ::sal_Int32 Element, const ::oox::AttributeList& rAttribs ) override;
 
diff --git a/include/oox/export/chartexport.hxx b/include/oox/export/chartexport.hxx
index f0fe9cd80f6a..dadad8d6ca34 100644
--- a/include/oox/export/chartexport.hxx
+++ b/include/oox/export/chartexport.hxx
@@ -207,7 +207,7 @@ private:
 
 public:
 
-    ChartExport( sal_Int32 nXmlNamespace, ::sax_fastparser::FSHelperPtr pFS, css::uno::Reference< css::frame::XModel >& xModel,
+    ChartExport( sal_Int32 nXmlNamespace, ::sax_fastparser::FSHelperPtr pFS, css::uno::Reference< css::frame::XModel > const & xModel,
                  ::oox::core::XmlFilterBase* pFB, DocumentType eDocumentType );
     virtual ~ChartExport() {}
 
diff --git a/include/oox/helper/binaryoutputstream.hxx b/include/oox/helper/binaryoutputstream.hxx
index 796777f60209..2b954a66f49a 100644
--- a/include/oox/helper/binaryoutputstream.hxx
+++ b/include/oox/helper/binaryoutputstream.hxx
@@ -185,7 +185,7 @@ public:
             wrapper. The data sequence MUST NOT be changed from outside as long
             as this stream wrapper is used to write to it.
      */
-    explicit            SequenceOutputStream( StreamDataSequence& rData );
+    explicit            SequenceOutputStream( StreamDataSequence const & rData );
 
     /** Writes the passed data sequence. */
     virtual void        writeData( const StreamDataSequence& rData, size_t nAtomSize = 1 ) override;
diff --git a/include/oox/ole/axcontrol.hxx b/include/oox/ole/axcontrol.hxx
index 25a91398a201..59e56dc3cedd 100644
--- a/include/oox/ole/axcontrol.hxx
+++ b/include/oox/ole/axcontrol.hxx
@@ -219,7 +219,7 @@ public:
                             sal_uInt32 nOleColor ) const;
 
     static void         convertToMSColor(
-                            PropertySet& rPropSet,
+                            PropertySet const & rPropSet,
                             sal_Int32 nPropId,
                             sal_uInt32& nOleColor,
                             sal_uInt32 nDefault = 0 );
@@ -236,7 +236,7 @@ public:
                             bool bHorizontal );
 
     static void         convertToMSOrientation(
-                            PropertySet& rPropMap,
+                            PropertySet const & rPropMap,
                             bool& bHorizontal );
 
     /** Converts the vertical alignment to UNO properties. */
@@ -281,7 +281,7 @@ public:
                             sal_Int32 nSpecialEffect ) const;
 
     static void        convertToAxBorder(
-                            PropertySet& rPropSet,
+                            PropertySet const & rPropSet,
                             sal_uInt32& nBorderColor,
                             sal_Int32& nBorderStyle,
                             sal_Int32& nSpecialEffect );
@@ -292,7 +292,7 @@ public:
                             sal_Int32 nSpecialEffect );
 
     static void         convertToAxVisualEffect(
-                            PropertySet& rPropSet,
+                            PropertySet const & rPropSet,
                             sal_Int32& nSpecialEffect );
 
     /** Converts the passed picture stream and Forms 2.0 position to UNO
@@ -319,7 +319,7 @@ public:
                             bool bAwtModel );
 
     static void        convertToAxState(
-                            PropertySet& rPropSet,
+                            PropertySet const & rPropSet,
                             OUString& rValue,
                             sal_Int32& nMultiSelect,
                             ApiDefaultStateMode eDefStateMode,
@@ -332,7 +332,7 @@ public:
                             sal_Int32 nOrientation );
 
     static void        convertToAxOrientation(
-                            PropertySet& rPropSet,
+                            PropertySet const & rPropSet,
                             const AxPairData& rSize,
                             sal_Int32& nOrientation );
 
diff --git a/include/oox/ole/axcontrolfragment.hxx b/include/oox/ole/axcontrolfragment.hxx
index a741aed06794..cc11252aa418 100644
--- a/include/oox/ole/axcontrolfragment.hxx
+++ b/include/oox/ole/axcontrolfragment.hxx
@@ -41,7 +41,7 @@ class AxControlPropertyContext : public ::oox::core::ContextHandler2
 {
 public:
     explicit            AxControlPropertyContext(
-                            ::oox::core::FragmentHandler2& rFragment,
+                            ::oox::core::FragmentHandler2 const & rFragment,
                             ControlModelBase& rModel );
 
     virtual ::oox::core::ContextHandlerRef
diff --git a/include/oox/ole/olehelper.hxx b/include/oox/ole/olehelper.hxx
index a0fe764e19c5..19b871ad27de 100644
--- a/include/oox/ole/olehelper.hxx
+++ b/include/oox/ole/olehelper.hxx
@@ -152,10 +152,10 @@ protected:
 public:
     MSConvertOCXControls( const css::uno::Reference< css::frame::XModel >& rxModel );
     virtual ~MSConvertOCXControls() override;
-    bool ReadOCXStorage( tools::SvRef<SotStorage>& rSrc1, css::uno::Reference< css::form::XFormComponent > & rxFormComp );
-    bool ReadOCXCtlsStream(tools::SvRef<SotStorageStream>& rSrc1, css::uno::Reference< css::form::XFormComponent > & rxFormComp,
+    bool ReadOCXStorage( tools::SvRef<SotStorage> const & rSrc1, css::uno::Reference< css::form::XFormComponent > & rxFormComp );
+    bool ReadOCXCtlsStream(tools::SvRef<SotStorageStream> const & rSrc1, css::uno::Reference< css::form::XFormComponent > & rxFormComp,
                                    sal_Int32 nPos, sal_Int32 nSize );
-    static bool WriteOCXStream( const css::uno::Reference< css::frame::XModel >& rxModel, tools::SvRef<SotStorage> &rSrc1, const css::uno::Reference< css::awt::XControlModel > &rControlModel, const css::awt::Size& rSize,OUString &rName);
+    static bool WriteOCXStream( const css::uno::Reference< css::frame::XModel >& rxModel, tools::SvRef<SotStorage> const &rSrc1, const css::uno::Reference< css::awt::XControlModel > &rControlModel, const css::awt::Size& rSize,OUString &rName);
     static bool WriteOCXExcelKludgeStream( const css::uno::Reference< css::frame::XModel >& rxModel, const css::uno::Reference< css::io::XOutputStream >& xOutStrm, const css::uno::Reference< css::awt::XControlModel > &rControlModel, const css::awt::Size& rSize,OUString &rName);
 };
 
diff --git a/include/oox/ole/vbaproject.hxx b/include/oox/ole/vbaproject.hxx
index 4e6aacf24ad6..8e170324e9f4 100644
--- a/include/oox/ole/vbaproject.hxx
+++ b/include/oox/ole/vbaproject.hxx
@@ -146,7 +146,7 @@ public:
     /** Attaches VBA macros to objects registered via registerMacroAttacher(). */
     void                attachMacros();
 
-    void                setOleOverridesSink( css::uno::Reference< css::container::XNameContainer >&  rxOleOverridesSink ){ mxOleOverridesSink = rxOleOverridesSink; }
+    void                setOleOverridesSink( css::uno::Reference< css::container::XNameContainer > const & rxOleOverridesSink ){ mxOleOverridesSink = rxOleOverridesSink; }
 
 protected:
     /** Registers a dummy module that will be created when the VBA project is
diff --git a/include/oox/ppt/backgroundproperties.hxx b/include/oox/ppt/backgroundproperties.hxx
index ce8925db93b8..c1cb3c13fc64 100644
--- a/include/oox/ppt/backgroundproperties.hxx
+++ b/include/oox/ppt/backgroundproperties.hxx
@@ -33,7 +33,7 @@ namespace oox { namespace ppt {
 class BackgroundPropertiesContext : public ::oox::core::FragmentHandler2
 {
 public:
-    BackgroundPropertiesContext( ::oox::core::FragmentHandler2& rParent, ::oox::drawingml::FillProperties& rFillProperties );
+    BackgroundPropertiesContext( ::oox::core::FragmentHandler2 const & rParent, ::oox::drawingml::FillProperties& rFillProperties );
     virtual ::oox::core::ContextHandlerRef onCreateContext( sal_Int32 aElementToken, const AttributeList& rAttribs ) override;
 
 protected:
diff --git a/include/oox/ppt/customshowlistcontext.hxx b/include/oox/ppt/customshowlistcontext.hxx
index 34964697181e..216e43fe9d36 100644
--- a/include/oox/ppt/customshowlistcontext.hxx
+++ b/include/oox/ppt/customshowlistcontext.hxx
@@ -45,7 +45,7 @@ namespace oox { namespace ppt {
         std::vector< CustomShow >& mrCustomShowList;
 
     public:
-        CustomShowListContext( ::oox::core::FragmentHandler2& rParent,
+        CustomShowListContext( ::oox::core::FragmentHandler2 const & rParent,
                 std::vector< CustomShow >& rCustomShowList );
 
         virtual ~CustomShowListContext( ) override;
diff --git a/include/oox/ppt/pptgraphicshapecontext.hxx b/include/oox/ppt/pptgraphicshapecontext.hxx
index ba01f726c552..14e57633e0c1 100644
--- a/include/oox/ppt/pptgraphicshapecontext.hxx
+++ b/include/oox/ppt/pptgraphicshapecontext.hxx
@@ -36,7 +36,7 @@ class PPTGraphicShapeContext : public ::oox::drawingml::GraphicShapeContext
     SlidePersistPtr     mpSlidePersistPtr;
 
 public:
-    PPTGraphicShapeContext( ::oox::core::ContextHandler2Helper& rParent, const SlidePersistPtr& rSlidePersistPtr, const oox::drawingml::ShapePtr& pMasterShapePtr, const oox::drawingml::ShapePtr& pShapePtr );
+    PPTGraphicShapeContext( ::oox::core::ContextHandler2Helper const & rParent, const SlidePersistPtr& rSlidePersistPtr, const oox::drawingml::ShapePtr& pMasterShapePtr, const oox::drawingml::ShapePtr& pShapePtr );
     virtual ::oox::core::ContextHandlerRef onCreateContext( ::sal_Int32 Element, const ::oox::AttributeList& rAttribs ) override;
 };
 
diff --git a/include/oox/ppt/pptshapecontext.hxx b/include/oox/ppt/pptshapecontext.hxx
index c58296ff0ccd..6996fe730bd6 100644
--- a/include/oox/ppt/pptshapecontext.hxx
+++ b/include/oox/ppt/pptshapecontext.hxx
@@ -36,7 +36,7 @@ class PPTShapeContext : public ::oox::drawingml::ShapeContext
     SlidePersistPtr     mpSlidePersistPtr;
 
 public:
-    PPTShapeContext( ::oox::core::ContextHandler2Helper& rParent, const SlidePersistPtr& rSlidePersistPtr, const oox::drawingml::ShapePtr& pMasterShapePtr, const oox::drawingml::ShapePtr& pShapePtr );
+    PPTShapeContext( ::oox::core::ContextHandler2Helper const & rParent, const SlidePersistPtr& rSlidePersistPtr, const oox::drawingml::ShapePtr& pMasterShapePtr, const oox::drawingml::ShapePtr& pShapePtr );
     virtual ::oox::core::ContextHandlerRef onCreateContext( ::sal_Int32 Element, const ::oox::AttributeList& rAttribs ) override;
 };
 
diff --git a/include/oox/ppt/pptshapegroupcontext.hxx b/include/oox/ppt/pptshapegroupcontext.hxx
index 011cdff62a86..de497635d34d 100644
--- a/include/oox/ppt/pptshapegroupcontext.hxx
+++ b/include/oox/ppt/pptshapegroupcontext.hxx
@@ -44,7 +44,7 @@ class PPTShapeGroupContext : public ::oox::drawingml::ShapeGroupContext
 
 public:
     PPTShapeGroupContext(
-        ::oox::core::ContextHandler2Helper& rParent,
+        ::oox::core::ContextHandler2Helper const & rParent,
         const oox::ppt::SlidePersistPtr& rSlidePersistPtr,
         const oox::ppt::ShapeLocation eShapeLocation,
         const oox::drawingml::ShapePtr& pMasterShapePtr,
diff --git a/include/oox/ppt/pptshapepropertiescontext.hxx b/include/oox/ppt/pptshapepropertiescontext.hxx
index dffa4795ae28..7e2039a7c794 100644
--- a/include/oox/ppt/pptshapepropertiescontext.hxx
+++ b/include/oox/ppt/pptshapepropertiescontext.hxx
@@ -35,7 +35,7 @@ namespace oox { namespace ppt {
 class PPTShapePropertiesContext : public ::oox::drawingml::ShapePropertiesContext
 {
 public:
-    PPTShapePropertiesContext( ::oox::core::ContextHandler2Helper& rParent, ::oox::drawingml::Shape& rShape );
+    PPTShapePropertiesContext( ::oox::core::ContextHandler2Helper const & rParent, ::oox::drawingml::Shape& rShape );
     virtual ::oox::core::ContextHandlerRef
         onCreateContext( ::sal_Int32 Element, const ::oox::AttributeList& rAttribs ) override;
 };
diff --git a/include/oox/ppt/slidemastertextstylescontext.hxx b/include/oox/ppt/slidemastertextstylescontext.hxx
index a5ca1c2372b2..109732f8302a 100644
--- a/include/oox/ppt/slidemastertextstylescontext.hxx
+++ b/include/oox/ppt/slidemastertextstylescontext.hxx
@@ -32,7 +32,7 @@ namespace oox { namespace ppt {
 class SlideMasterTextStylesContext : public oox::core::FragmentHandler2
 {
 public:
-    SlideMasterTextStylesContext( ::oox::core::FragmentHandler2& rParent, SlidePersistPtr const & pSlidePersistPtr );
+    SlideMasterTextStylesContext( ::oox::core::FragmentHandler2 const & rParent, SlidePersistPtr const & pSlidePersistPtr );
     virtual ~SlideMasterTextStylesContext() override;
     virtual ::oox::core::ContextHandlerRef onCreateContext( sal_Int32 aElementToken, const AttributeList& rAttribs ) override;
 
diff --git a/include/oox/ppt/slidetimingcontext.hxx b/include/oox/ppt/slidetimingcontext.hxx
index de936ad2a205..f1c428682db2 100644
--- a/include/oox/ppt/slidetimingcontext.hxx
+++ b/include/oox/ppt/slidetimingcontext.hxx
@@ -32,7 +32,7 @@ namespace oox { namespace ppt {
 class SlideTimingContext : public ::oox::core::FragmentHandler2
 {
 public:
-    SlideTimingContext( ::oox::core::FragmentHandler2& rParent, TimeNodePtrList & aTimeNodeList ) throw();
+    SlideTimingContext( ::oox::core::FragmentHandler2 const & rParent, TimeNodePtrList & aTimeNodeList ) throw();
     virtual ~SlideTimingContext() throw() override;
 
     virtual ::oox::core::ContextHandlerRef onCreateContext( sal_Int32 aElementToken, const AttributeList& rAttribs ) override;
diff --git a/include/oox/ppt/slidetransitioncontext.hxx b/include/oox/ppt/slidetransitioncontext.hxx
index 4edaa3fcae9f..3361fd07a5a5 100644
--- a/include/oox/ppt/slidetransitioncontext.hxx
+++ b/include/oox/ppt/slidetransitioncontext.hxx
@@ -35,7 +35,7 @@ namespace oox { namespace ppt {
     class SlideTransitionContext : public ::oox::core::FragmentHandler2
     {
     public:
-        SlideTransitionContext( ::oox::core::FragmentHandler2& rParent,
+        SlideTransitionContext( ::oox::core::FragmentHandler2 const & rParent,
             const AttributeList& rAttributes,
             PropertyMap & aProperties ) throw();
         virtual ~SlideTransitionContext() throw() override;
diff --git a/include/oox/ppt/soundactioncontext.hxx b/include/oox/ppt/soundactioncontext.hxx
index 4680332a4fe4..99435959c472 100644
--- a/include/oox/ppt/soundactioncontext.hxx
+++ b/include/oox/ppt/soundactioncontext.hxx
@@ -36,7 +36,7 @@ namespace oox { namespace ppt {
 class SoundActionContext : public ::oox::core::FragmentHandler2
 {
 public:
-    SoundActionContext( ::oox::core::FragmentHandler2& rParent, PropertyMap & aProperties ) throw();
+    SoundActionContext( ::oox::core::FragmentHandler2 const & rParent, PropertyMap & aProperties ) throw();
     virtual ~SoundActionContext() throw() override;
 
     virtual void onEndElement() override;
diff --git a/include/oox/ppt/timenodelistcontext.hxx b/include/oox/ppt/timenodelistcontext.hxx
index 1012f7328c7b..e592cc289f33 100644
--- a/include/oox/ppt/timenodelistcontext.hxx
+++ b/include/oox/ppt/timenodelistcontext.hxx
@@ -40,10 +40,10 @@ namespace oox { namespace ppt {
     public:
         virtual ~TimeNodeContext() throw() override;
 
-        static TimeNodeContext * SAL_CALL makeContext( ::oox::core::FragmentHandler2& rParent, sal_Int32  aElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttribs, const TimeNodePtr & pNode );
+        static TimeNodeContext * SAL_CALL makeContext( ::oox::core::FragmentHandler2 const & rParent, sal_Int32  aElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttribs, const TimeNodePtr & pNode );
 
     protected:
-        TimeNodeContext( ::oox::core::FragmentHandler2& rParent, sal_Int32  aElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttribs, const TimeNodePtr & pNode ) throw();
+        TimeNodeContext( ::oox::core::FragmentHandler2 const & rParent, sal_Int32  aElement, const css::uno::Reference< css::xml::sax::XFastAttributeList >& xAttribs, const TimeNodePtr & pNode ) throw();
 
         sal_Int32 mnElement;
         TimeNodePtr mpNode;
@@ -54,7 +54,7 @@ namespace oox { namespace ppt {
 class TimeNodeListContext : public ::oox::core::FragmentHandler2
 {
 public:
-    TimeNodeListContext( ::oox::core::FragmentHandler2& rParent, TimeNodePtrList & aList ) throw();
+    TimeNodeListContext( ::oox::core::FragmentHandler2 const & rParent, TimeNodePtrList & aList ) throw();
 
     virtual ~TimeNodeListContext() throw() override;
     virtual ::oox::core::ContextHandlerRef onCreateContext( sal_Int32 aElementToken, const AttributeList& rAttribs ) override;
diff --git a/include/oox/vml/vmlshape.hxx b/include/oox/vml/vmlshape.hxx
index 44f973b57169..cad99b719c26 100644
--- a/include/oox/vml/vmlshape.hxx
+++ b/include/oox/vml/vmlshape.hxx
@@ -295,7 +295,7 @@ protected:
     /** Used by both RectangleShape and ComplexShape. */
     css::uno::Reference<css::drawing::XShape>createPictureObject(
             const css::uno::Reference< css::drawing::XShapes >& rxShapes,
-            const css::awt::Rectangle& rShapeRect, OUString& rGraphicPath ) const;
+            const css::awt::Rectangle& rShapeRect, OUString const & rGraphicPath ) const;
 
 private:
     OUString     maService;          ///< Name of the UNO shape service.
diff --git a/include/oox/vml/vmlshapecontext.hxx b/include/oox/vml/vmlshapecontext.hxx
index 1c1565b62397..fe7afb417b52 100644
--- a/include/oox/vml/vmlshapecontext.hxx
+++ b/include/oox/vml/vmlshapecontext.hxx
@@ -49,7 +49,7 @@ class ShapeLayoutContext : public ::oox::core::ContextHandler2
 {
 public:
     explicit            ShapeLayoutContext(
-                            ::oox::core::ContextHandler2Helper& rParent,
+                            ::oox::core::ContextHandler2Helper const & rParent,
                             Drawing& rDrawing );
 
     virtual ::oox::core::ContextHandlerRef
@@ -64,7 +64,7 @@ class ClientDataContext : public ::oox::core::ContextHandler2
 {
 public:
     explicit            ClientDataContext(
-                            ::oox::core::ContextHandler2Helper& rParent,
+                            ::oox::core::ContextHandler2Helper const & rParent,
                             ClientData& rClientData,
                             const AttributeList& rAttribs );
 
@@ -84,13 +84,13 @@ class ShapeContextBase : public ::oox::core::ContextHandler2
 public:
     static ::oox::core::ContextHandlerRef
                         createShapeContext(
-                            ::oox::core::ContextHandler2Helper& rParent,
+                            ::oox::core::ContextHandler2Helper const & rParent,
                             ShapeContainer& rShapes,
                             sal_Int32 nElement,
                             const AttributeList& rAttribs );
 
 protected:
-    explicit            ShapeContextBase( ::oox::core::ContextHandler2Helper& rParent );
+    explicit            ShapeContextBase( ::oox::core::ContextHandler2Helper const & rParent );
 };
 
 
@@ -98,7 +98,7 @@ class ShapeTypeContext : public ShapeContextBase
 {
 public:
     explicit            ShapeTypeContext(
-                            ::oox::core::ContextHandler2Helper& rParent,
+                            ::oox::core::ContextHandler2Helper const & rParent,
                             ShapeType& rShapeType,
                             const AttributeList& rAttribs );
 
@@ -121,7 +121,7 @@ class ShapeContext : public ShapeTypeContext
 {
 public:
     explicit            ShapeContext(
-                            ::oox::core::ContextHandler2Helper& rParent,
+                            ::oox::core::ContextHandler2Helper const & rParent,
                             ShapeBase& rShape,
                             const AttributeList& rAttribs );
 
@@ -154,7 +154,7 @@ class GroupShapeContext : public ShapeContext
 {
 public:
     explicit            GroupShapeContext(
-                            ::oox::core::ContextHandler2Helper& rParent,
+                            ::oox::core::ContextHandler2Helper const & rParent,
                             GroupShape& rShape,
                             const AttributeList& rAttribs );
 
@@ -170,7 +170,7 @@ class RectangleShapeContext : public ShapeContext
 {
 public:
     explicit            RectangleShapeContext(
-                            ::oox::core::ContextHandler2Helper& rParent,
+                            ::oox::core::ContextHandler2Helper const & rParent,
                             const AttributeList& rAttribs,
                             RectangleShape& rShape );
 
diff --git a/include/oox/vml/vmltextboxcontext.hxx b/include/oox/vml/vmltextboxcontext.hxx
index 801cccb13a3d..c31ddf6c5029 100644
--- a/include/oox/vml/vmltextboxcontext.hxx
+++ b/include/oox/vml/vmltextboxcontext.hxx
@@ -39,9 +39,9 @@ class TextPortionContext : public ::oox::core::ContextHandler2
 {
 public:
     explicit            TextPortionContext(
-                            ::oox::core::ContextHandler2Helper& rParent,
+                            ::oox::core::ContextHandler2Helper const & rParent,
                             TextBox& rTextBox,
-                            TextParagraphModel& rParagraph,
+                            TextParagraphModel const & rParagraph,
                             const TextFontModel& rParentFont,
                             sal_Int32 nElement,
                             const AttributeList& rAttribs );
@@ -64,7 +64,7 @@ class TextBoxContext : public ::oox::core::ContextHandler2
 {
 public:
     explicit            TextBoxContext(
-                            ::oox::core::ContextHandler2Helper& rParent,
+                            ::oox::core::ContextHandler2Helper const & rParent,
                             TextBox& rTextBox,
                             const AttributeList& rAttribs,
                             const GraphicHelper& graphicHelper );