ENH: add function ReplaceParameter()

Modules/Wrappers/ApplicationEngine/include/otbWrapperParameterGroup.h

@@ -47,6 +47,11 @@ public:
 
   void AddParameter(Parameter::Pointer p);
 
+  /** Method to substitute a parameter in a group. The new parameter
+   *  should match the key of the replaced parameter.
+   *  The function returns true on success, false on failure */
+  bool ReplaceParameter(Parameter::Pointer p);
+
   /** Add a new choice value to an existing choice parameter */
   void AddChoice(std::string paramKey, std::string paramName);
 

Modules/Wrappers/ApplicationEngine/src/otbWrapperParameterGroup.cxx

@@ -36,6 +36,7 @@
 #include "otbWrapperInputProcessXMLParameter.h"
 #include "otbWrapperParameterKey.h"
 #include "otbWrapperRAMParameter.h"
+#include "otbWrapperProxyParameter.h"
 
 #include "otb_boost_string_header.h"
 
@@ -666,6 +667,31 @@ ParameterGroup::AddParameter(Parameter::Pointer p)
   m_ParameterList.push_back(p);
 }
 
+bool
+ParameterGroup::ReplaceParameter(Parameter::Pointer p)
+{
+  // find current parameter in the current group
+  Parameter::Pointer parentParam;
+  ParameterListType::iterator vit;
+  std::string inputKey(p->GetKey());
+  for (vit = m_ParameterList.begin(); vit != m_ParameterList.end(); ++vit)
+    {
+    if (inputKey.compare((*vit)->GetKey()) == 0)
+      {
+      parentParam = *vit;
+      break;
+      }
+    }
+  if (parentParam.IsNull())
+    {
+    return false;
+    }
+  // don't check type compatibility here, we may want to handle special cases
+  // at higher level
+  *vit = p;
+  return true;
+}
+
 Parameter::Pointer
 ParameterGroup::GetParameterByIndex(unsigned int i)
 {