+ add new class ParameterSerializer to load and save parameter files

src/Base/Parameter.cpp

@@ -957,6 +957,34 @@ void ParameterGrp::NotifyAll()
         Notify(It5->first.c_str());
 }
 
+//**************************************************************************
+//**************************************************************************
+// ParameterSerializer
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ParameterSerializer::ParameterSerializer(const std::string& fn)
+  : filename(fn)
+{
+}
+
+ParameterSerializer::~ParameterSerializer()
+{
+}
+
+void ParameterSerializer::SaveDocument(const ParameterManager& mgr)
+{
+    mgr.SaveDocument(filename.c_str());
+}
+
+int ParameterSerializer::LoadDocument(ParameterManager& mgr)
+{
+    return mgr.LoadDocument(filename.c_str());
+}
+
+bool ParameterSerializer::LoadOrCreateDocument(ParameterManager& mgr)
+{
+    return mgr.LoadOrCreateDocument(filename.c_str());
+}
+
 //**************************************************************************
 //**************************************************************************
 // ParameterManager
@@ -970,7 +998,7 @@ static XercesDOMParser::ValSchemes    gValScheme       = XercesDOMParser::Val_Au
 /** Default construction
   */
 ParameterManager::ParameterManager()
-  : ParameterGrp(), _pDocument(0)
+  : ParameterGrp(), _pDocument(0), paramSerializer(0)
 {
     // initialize the XML system
     Init();
@@ -1036,6 +1064,7 @@ ParameterManager::ParameterManager()
 ParameterManager::~ParameterManager()
 {
     delete _pDocument;
+    delete paramSerializer;
 }
 
 void ParameterManager::Init(void)
@@ -1069,6 +1098,43 @@ void ParameterManager::Terminate(void)
     XMLPlatformUtils::Terminate();
 }
 
+//**************************************************************************
+// Serializer handling
+
+void ParameterManager::SetSerializer(ParameterSerializer* ps)
+{
+    if (paramSerializer != ps)
+        delete paramSerializer;
+    paramSerializer = ps;
+}
+
+bool ParameterManager::HasSerializer() const
+{
+    return (paramSerializer != 0);
+}
+
+int ParameterManager::LoadDocument()
+{
+    if (paramSerializer)
+        return paramSerializer->LoadDocument(*this);
+    else
+        return -1;
+}
+
+bool ParameterManager::LoadOrCreateDocument()
+{
+    if (paramSerializer)
+        return paramSerializer->LoadOrCreateDocument(*this);
+    else
+        return false;
+}
+
+void ParameterManager::SaveDocument() const
+{
+    if (paramSerializer)
+        paramSerializer->SaveDocument(*this);
+}
+
 //**************************************************************************
 // Document handling
 

src/Base/Parameter.h

@@ -25,7 +25,7 @@
 
 #ifndef BASE__PARAMETER_H
 #define BASE__PARAMETER_H
-
+
 // (re-)defined in pyconfig.h
 #if defined (_POSIX_C_SOURCE)
 #   undef    _POSIX_C_SOURCE
@@ -264,13 +264,33 @@ protected:
 
 };
 
+/** The parameter serializer class
+ *  This is a helper class to serialize a parameter XML document.
+ *  Does loading and saving the DOM document from and to files.
+ *  In sub-classes the load and saving of XML documents can be
+ *  customized.
+ *  @see ParameterManager
+ */
+class BaseExport ParameterSerializer
+{
+public:
+    ParameterSerializer(const std::string& fn);
+    virtual ~ParameterSerializer();
+
+    virtual void SaveDocument(const ParameterManager&);
+    virtual int LoadDocument(ParameterManager&);
+    virtual bool LoadOrCreateDocument(ParameterManager&);
+
+protected:
+    std::string filename;
+};
 
 /** The parameter manager class
  *  This class manages a parameter XML document.
- *  Does loding, saving and handling the DOM document.
+ *  Does loading, saving and handling the DOM document.
  *  @see ParameterGrp
  */
-class BaseExport ParameterManager	: public ParameterGrp
+class BaseExport ParameterManager : public ParameterGrp
 {
 public:
     ParameterManager();
@@ -286,9 +306,24 @@ public:
     void  CreateDocument(void);
     void  CheckDocument() const;
 
+    /** @name Parameter serialization */
+    //@{
+    /// Sets a serializer. The ParameterManager takes ownership of the serializer.
+    void  SetSerializer(ParameterSerializer*);
+    /// Returns true if a serializer is set, otherwise false is returned.
+    bool  HasSerializer() const;
+    /// Loads an XML document by calling the serializer's load method.
+    int   LoadDocument();
+    /// Loads or creates an XML document by calling the serializer's load method.
+    bool  LoadOrCreateDocument();
+    /// Saves an XML document by calling the serializer's save method.
+    void  SaveDocument() const;
+    //@}
+
 private:
 
     XERCES_CPP_NAMESPACE_QUALIFIER DOMDocument   *_pDocument;
+    ParameterSerializer * paramSerializer;
 
     bool          gDoNamespaces         ;
     bool          gDoSchema             ;