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vtkRCalculatorFilter.cxx
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vtkRCalculatorFilter.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkRCalculatorFilter.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
/*-------------------------------------------------------------------------
Copyright 2009 Sandia Corporation.
Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------*/
#include "vtkObjectFactory.h"
#include "vtkRCalculatorFilter.h"
#include "vtkRInterface.h"
#include "vtkErrorCode.h"
#include "vtkDataSet.h"
#include "vtkGraph.h"
#include "vtkFieldData.h"
#include "vtkArrayData.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkCellData.h"
#include "vtkPointData.h"
#include "vtkDataArray.h"
#include "vtkDemandDrivenPipeline.h"
#include "vtkStreamingDemandDrivenPipeline.h"
#include "vtkCompositeDataSet.h"
#include "vtkCompositeDataIterator.h"
#include "vtkDoubleArray.h"
#include "vtkTable.h"
#include "vtkTree.h"
#include "vtkMultiPieceDataSet.h"
#include "vtkStringArray.h"
#include <cstdlib>
#include <string>
#include <vector>
#include <sstream>
#include <sys/stat.h>
#define BUFFER_SIZE 32768
vtkStandardNewMacro(vtkRCalculatorFilter);
class ArrNames
{
public:
ArrNames(const char* Vname, const char* Rname)
{
this->VTKArrName = Vname;
this->RarrName = Rname;
};
std::string VTKArrName;
std::string RarrName;
};
class RVariableNames
{
public:
RVariableNames()
{
this->ResetNameIterator();
}
void SetName(std::string name)
{
this->Names.push_back(name);
this->ResetNameIterator();
}
void SetNames(vtkStringArray* names)
{
this->Names.clear();
for (vtkIdType i = 0; i < names->GetNumberOfTuples(); ++i)
{
this->Names.push_back(names->GetValue(i));
}
this->ResetNameIterator();
}
void ResetNameIterator()
{
this->NameIterator = this->Names.begin();
}
std::string NextName()
{
return *this->NameIterator++;
}
bool HasName()
{
return this->NameIterator != this->Names.end();
}
void Clear()
{
this->Names.clear();
this->ResetNameIterator();
}
int Count()
{
return this->Names.size();
}
std::vector<std::string> Names;
std::vector<std::string>::iterator NameIterator;
};
class vtkRCalculatorFilterInternals
{
public:
std::vector<ArrNames> PutArrNames;
std::vector<ArrNames> GetArrNames;
RVariableNames PutTableNames;
RVariableNames GetTableNames;
RVariableNames PutTreeNames;
RVariableNames GetTreeNames;
};
vtkRCalculatorFilter::vtkRCalculatorFilter()
{
this->ri = 0;
this->Rscript = 0;
this->RfileScript = 0;
this->ScriptFname = 0;
this->TimeOutput = 1;
this->Routput = 1;
this->BlockInfoOutput = 1;
this->ScriptFname = 0;
this->CurrentTime = 0;
this->TimeRange = 0;
this->TimeSteps = 0;
this->BlockId = 0;
this->NumBlocks = 0;
this->Routput = 1;
this->rcfi = new vtkRCalculatorFilterInternals();
this->OutputBuffer = new char[BUFFER_SIZE];
this->GetInputPortInformation(0)->Set(vtkAlgorithm::INPUT_IS_REPEATABLE(), 1);
}
vtkRCalculatorFilter::~vtkRCalculatorFilter()
{
delete this->rcfi;
if(this->ri)
{
this->ri->Delete();
}
delete [] this->Rscript;
delete [] this->RfileScript;
delete [] this->ScriptFname;
if(this->CurrentTime)
{
this->CurrentTime->Delete();
}
if(this->TimeRange)
{
this->TimeRange->Delete();
}
if(this->TimeSteps)
{
this->TimeSteps->Delete();
}
if(this->BlockId)
{
this->BlockId->Delete();
}
if(this->NumBlocks)
{
this->NumBlocks->Delete();
}
delete [] this->OutputBuffer;
}
void vtkRCalculatorFilter::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Rscript: "
<< (this->Rscript ? this->Rscript : "(none)") << endl;
os << indent << "RfileScript: "
<< (this->RfileScript ? this->RfileScript : "(none)") << endl;
os << indent << "ScriptFname: "
<< (this->ScriptFname ? this->ScriptFname : "(none)") << endl;
os << indent << "Routput: "
<< (this->Routput ? "On" : "Off") << endl;
os << indent << "TimeOutput: "
<< (this->TimeOutput ? "On" : "Off") << endl;
os << indent << "BlockInfoOutput: "
<< (this->BlockInfoOutput ? "On" : "Off") << endl;
os << indent << "CurrentTime: " << endl;
if (this->CurrentTime)
{
this->CurrentTime->PrintSelf(os, indent.GetNextIndent());
}
else
{
os << indent << "(none)" << endl;
}
os << indent << "TimeRange: " << endl;
if (this->TimeRange)
{
this->TimeRange->PrintSelf(os, indent.GetNextIndent());
}
else
{
os << indent << "(none)" << endl;
}
os << indent << "TimeSteps: " << endl;
if (this->TimeSteps)
{
this->TimeSteps->PrintSelf(os, indent.GetNextIndent());
}
else
{
os << indent << "(none)" << endl;
}
os << indent << "BlockId: " << endl;
if (this->BlockId)
{
this->BlockId->PrintSelf(os, indent.GetNextIndent());
}
else
{
os << indent << "(none)" << endl;
}
os << indent << "NumBlocks: " << endl;
if (this->NumBlocks)
{
this->NumBlocks->PrintSelf(os, indent.GetNextIndent());
}
else
{
os << indent << "(none)" << endl;
}
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessRequest(
vtkInformation* request,
vtkInformationVector** inputVector,
vtkInformationVector* outputVector)
{
// create the output
if(request->Has(vtkDemandDrivenPipeline::REQUEST_DATA_OBJECT()))
{
return this->RequestDataObject(request, inputVector, outputVector);
}
return this->Superclass::ProcessRequest(request, inputVector, outputVector);
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::RequestDataObject(
vtkInformation*,
vtkInformationVector** inputVector ,
vtkInformationVector* outputVector)
{
vtkInformation* inInfo = inputVector[0]->GetInformationObject(0);
if (!inInfo)
{
return 0;
}
vtkDataObject *input = inInfo->Get(vtkDataObject::DATA_OBJECT());
if (input)
{
//one output port, but multiple InformationObjects()
for(int i=0; i < this->GetNumberOfOutputPorts(); ++i)
{
vtkInformation* info = outputVector->GetInformationObject(i);
vtkDataObject *output = info->Get(vtkDataObject::DATA_OBJECT());
if (this->HasMultipleGets())
{
if (!output || !output->IsA("vtkMultiPieceDataSet"))
{
vtkDataObject* newOutput = vtkMultiPieceDataSet::New();
info->Set(vtkDataObject::DATA_OBJECT(), newOutput);
newOutput->Delete();
}
}
else
{
if (!output || !output->IsA(input->GetClassName()))
{
vtkDataObject* newOutput = NULL;
if (this->rcfi->GetTableNames.Count() > 0)
{
newOutput = vtkTable::New();
}
else if (this->rcfi->GetTreeNames.Count() > 0)
{
newOutput = vtkTree::New();
}
else
{
newOutput = input->NewInstance();
}
info->Set(vtkDataObject::DATA_OBJECT(), newOutput);
newOutput->Delete();
}
}
}
return (1);
}
return 0;
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::RequestData(vtkInformation *vtkNotUsed(request),
vtkInformationVector **inputVector,
vtkInformationVector *outputVector)
{
int result;
if(!this->ri)
{
this->ri = vtkRInterface::New();
}
if(this->ScriptFname)
{
this->SetRscriptFromFile(this->ScriptFname);
}
if( (!this->Rscript) && (!this->RfileScript) )
{
return(1);
}
if(this->Routput)
{
this->ri->OutputBuffer(this->OutputBuffer, BUFFER_SIZE);
}
vtkInformation* outinfo = outputVector->GetInformationObject(0);
vtkInformation* inpinfo = inputVector[0]->GetInformationObject(0);
vtkDataObject* input = inpinfo->Get(vtkDataObject::DATA_OBJECT());
vtkDataObject* output = outinfo->Get(vtkDataObject::DATA_OBJECT());
// initialize the output's components if it is a composite data set.
if (this->HasMultipleGets())
{
vtkMultiPieceDataSet* outComposite =
vtkMultiPieceDataSet::SafeDownCast(output);
int tableCount = 0;
int treeCount = 0;
int itemCount = 0;
for (int i=0; i < this->rcfi->GetTableNames.Count() - tableCount; i++)
{
vtkTable *table = vtkTable::New();
outComposite->SetPiece(itemCount++, table);
table->Delete();
}
for (int i=0; i < this->rcfi->GetTreeNames.Count() - treeCount; i++)
{
vtkTree *tree = vtkTree::New();
outComposite->SetPiece(itemCount++, tree);
tree->Delete();
}
}
else if (!output->IsA("vtkTable") && !output->IsA("vtkTree"))
{
// some tests assume that input arrays will also be present in the output
// data set.
output->ShallowCopy(input);
}
// For now: use the first input information for timing
if(this->TimeOutput)
{
if ( inpinfo->Has(vtkStreamingDemandDrivenPipeline::TIME_STEPS()) )
{
int length = inpinfo->Length( vtkStreamingDemandDrivenPipeline::TIME_STEPS() );
if(!this->TimeSteps)
{
this->TimeSteps = vtkDoubleArray::New();
this->TimeSteps->SetNumberOfComponents(1);
this->TimeSteps->SetNumberOfTuples(length);
}
else if(this->TimeSteps->GetNumberOfTuples() != length)
{
this->TimeSteps->SetNumberOfTuples(length);
}
for(int i = 0; i<length; i++)
{
this->TimeSteps->InsertValue(i,
inpinfo->Get( vtkStreamingDemandDrivenPipeline::TIME_STEPS() )[i] );
}
this->ri->AssignVTKDataArrayToRVariable(this->TimeSteps, "VTK_TIME_STEPS");
}
if ( inpinfo->Has(vtkStreamingDemandDrivenPipeline::TIME_RANGE()) )
{
if(!this->TimeRange)
{
this->TimeRange = vtkDoubleArray::New();
this->TimeRange->SetNumberOfComponents(1);
this->TimeRange->SetNumberOfTuples(2);
}
this->TimeRange->InsertValue(0,inpinfo->Get( vtkStreamingDemandDrivenPipeline::TIME_RANGE() )[0] );
this->TimeRange->InsertValue(1,inpinfo->Get( vtkStreamingDemandDrivenPipeline::TIME_RANGE() )[1] );
this->ri->AssignVTKDataArrayToRVariable(this->TimeRange, "VTK_TIME_RANGE");
}
if ( input->GetInformation()->Has(vtkDataObject::DATA_TIME_STEP()) )
{
if(!this->CurrentTime)
{
this->CurrentTime = vtkDoubleArray::New();
this->CurrentTime->SetNumberOfComponents(1);
this->CurrentTime->SetNumberOfTuples(1);
}
this->CurrentTime->InsertValue(0,input->GetInformation()->Get( vtkDataObject::DATA_TIME_STEP()) );
this->ri->AssignVTKDataArrayToRVariable(this->CurrentTime, "VTK_CURRENT_TIME");
}
}
// assign vtk variables to R variables
int numberOfInputs = inputVector[0]->GetNumberOfInformationObjects();
rcfi->PutTableNames.ResetNameIterator();
rcfi->PutTreeNames.ResetNameIterator();
for ( int i = 0; i < numberOfInputs; i++)
{
inpinfo = inputVector[0]->GetInformationObject(i);
input = inpinfo->Get(vtkDataObject::DATA_OBJECT());
this->ProcessInputDataObject(input);
}
//run scripts
if(this->Rscript)
{
result = this->ri->EvalRscript(this->Rscript);
if(result)
{
vtkErrorMacro(<<"Failed to evaluate command string in R");
return(1);
}
if(this->Routput)
{
cout << this->OutputBuffer << endl;
}
}
if(this->RfileScript)
{
result = this->ri->EvalRscript(this->RfileScript);
if(result)
{
vtkErrorMacro(<<"Failed to evaluate command string in R");
return(1);
}
if(this->Routput)
{
cout << this->OutputBuffer << endl;
}
}
// generate output
rcfi->GetTableNames.ResetNameIterator();
rcfi->GetTreeNames.ResetNameIterator();
if (this->ProcessOutputDataObject(output) != 0)
{
vtkErrorMacro(<<"Filter does not handle output data type");
return 1;
}
return 1;
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessInputDataSet(vtkDataSet* dsIn)
{
int ncells;
int npoints;
vtkDataSetAttributes* CellinFD = 0;
vtkDataSetAttributes* PointinFD = 0;
std::vector<ArrNames>::iterator VectorIterator;
vtkDataArray* currentArray = 0;
CellinFD = dsIn->GetCellData();
PointinFD = dsIn->GetPointData();
ncells = dsIn->GetNumberOfCells();
npoints = dsIn->GetNumberOfPoints();
if( (ncells < 1) && (npoints < 1) )
{
vtkErrorMacro(<<"Empty Data Set");
return(1);
}
for(VectorIterator = this->rcfi->PutArrNames.begin();
VectorIterator != this->rcfi->PutArrNames.end();
VectorIterator++)
{
currentArray = PointinFD->GetArray(VectorIterator->VTKArrName.c_str());
if(!currentArray)
{
currentArray = CellinFD->GetArray(VectorIterator->VTKArrName.c_str());
}
if(currentArray)
{
this->ri->AssignVTKDataArrayToRVariable(currentArray,
VectorIterator->RarrName.c_str());
}
else
{
vtkErrorMacro(<<"Array Name not in Data Set " << VectorIterator->VTKArrName.c_str());
return(1);
}
}
return (1);
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessOutputDataSet(vtkDataSet* dsOut)
{
vtkDataArray* currentArray = 0;
vtkDataSetAttributes* CelloutFD = dsOut->GetCellData();
vtkDataSetAttributes* PointoutFD = dsOut->GetPointData();
int ncells = dsOut->GetNumberOfCells();
int npoints = dsOut->GetNumberOfPoints();
std::vector<ArrNames>::iterator VectorIterator;
for(VectorIterator = this->rcfi->GetArrNames.begin();
VectorIterator != this->rcfi->GetArrNames.end();
VectorIterator++)
{
currentArray = this->ri->AssignRVariableToVTKDataArray(VectorIterator->RarrName.c_str());
if(!currentArray)
{
vtkErrorMacro(<<"Failed to get array from R");
return(1);
}
int ntuples = currentArray->GetNumberOfTuples();
vtkDataSetAttributes* dsa;
if(ntuples == ncells)
{
dsa = CelloutFD;
}
else if(ntuples == npoints)
{
dsa = PointoutFD;
}
else
{
vtkErrorMacro(<<"Array returned from R has wrong size");
currentArray->Delete();
return(1);
}
currentArray->SetName(VectorIterator->VTKArrName.c_str());
if(dsa->HasArray(VectorIterator->VTKArrName.c_str()))
{
dsa->RemoveArray(VectorIterator->VTKArrName.c_str());
}
dsa->AddArray(currentArray);
}
return(1);
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessInputGraph(vtkGraph* gIn)
{
vtkDataSetAttributes* CellinFD = gIn->GetEdgeData();
vtkDataSetAttributes* PointinFD = gIn->GetVertexData();
int ncells = gIn->GetNumberOfEdges();
int npoints = gIn->GetNumberOfVertices();
if( (npoints < 1) && (ncells < 1) )
{
vtkErrorMacro(<<"Empty Data Set");
return(1);
}
std::vector<ArrNames>::iterator VectorIterator;
vtkDataArray* currentArray = 0;
for(VectorIterator = this->rcfi->PutArrNames.begin();
VectorIterator != this->rcfi->PutArrNames.end();
VectorIterator++)
{
currentArray = PointinFD->GetArray(VectorIterator->VTKArrName.c_str());
if(!currentArray)
{
currentArray = CellinFD->GetArray(VectorIterator->VTKArrName.c_str());
}
if(currentArray)
{
this->ri->AssignVTKDataArrayToRVariable(currentArray,
VectorIterator->RarrName.c_str());
}
else
{
vtkErrorMacro(<<"Array Name not in Data Set " << VectorIterator->VTKArrName.c_str());
return(1);
}
}
return (1);
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessOutputGraph(vtkGraph* gOut)
{
vtkDataSetAttributes * CelloutFD = gOut->GetEdgeData();
vtkDataSetAttributes *PointoutFD = gOut->GetVertexData();
int ncells = gOut->GetNumberOfEdges();
int npoints = gOut->GetNumberOfVertices();
vtkDataArray* currentArray = 0;
std::vector<ArrNames>::iterator VectorIterator;
for(VectorIterator = this->rcfi->GetArrNames.begin();
VectorIterator != this->rcfi->GetArrNames.end();
VectorIterator++)
{
currentArray = this->ri->AssignRVariableToVTKDataArray(VectorIterator->RarrName.c_str());
if(!currentArray)
{
vtkErrorMacro(<<"Failed to get array from R");
return(1);
}
int ntuples = currentArray->GetNumberOfTuples();
vtkDataSetAttributes* dsa;
if(ntuples == ncells)
{
dsa = CelloutFD;
}
else if(ntuples == npoints)
{
dsa = PointoutFD;
}
else
{
vtkErrorMacro(<<"Array returned from R has wrong size");
currentArray->Delete();
return(1);
}
currentArray->SetName(VectorIterator->VTKArrName.c_str());
if(dsa->HasArray(VectorIterator->VTKArrName.c_str()))
{
dsa->RemoveArray(VectorIterator->VTKArrName.c_str());
}
dsa->AddArray(currentArray);
}
return (1);
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessInputArrayData(vtkArrayData * adIn)
{
vtkArray* cArray = 0;
std::vector<ArrNames>::iterator VectorIterator;
for(VectorIterator = this->rcfi->PutArrNames.begin();
VectorIterator != this->rcfi->PutArrNames.end();
VectorIterator++)
{
int index = atoi(VectorIterator->VTKArrName.c_str());
if( (index < 0) || (index >= adIn->GetNumberOfArrays()) )
{
vtkErrorMacro(<<"Array Index out of bounds " << index);
return(1);
}
cArray = adIn->GetArray(index);
this->ri->AssignVTKArrayToRVariable(cArray, VectorIterator->RarrName.c_str());
}
return (1);
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessOutputArrayData(vtkArrayData * adOut)
{
vtkArray * cArray = 0;
std::vector<ArrNames>::iterator VectorIterator;
for(VectorIterator = this->rcfi->GetArrNames.begin();
VectorIterator != this->rcfi->GetArrNames.end();
VectorIterator++)
{
cArray = this->ri->AssignRVariableToVTKArray(VectorIterator->RarrName.c_str());
if(!cArray)
{
vtkErrorMacro(<<"Failed to get array from R");
return(1);
}
cArray->SetName(VectorIterator->VTKArrName.c_str());
adOut->AddArray(cArray);
}
return (1);
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessInputCompositeDataSet(vtkCompositeDataSet* cdsIn)
{
vtkCompositeDataIterator* iter = cdsIn->NewIterator();
if(this->BlockInfoOutput)
{
if(!this->BlockId)
{
this->BlockId = vtkDoubleArray::New();
this->BlockId->SetNumberOfComponents(1);
this->BlockId->SetNumberOfTuples(1);
}
if(!this->NumBlocks)
{
this->NumBlocks = vtkDoubleArray::New();
this->NumBlocks->SetNumberOfComponents(1);
this->NumBlocks->SetNumberOfTuples(1);
}
int nb = 0;
for (iter->InitTraversal(); !iter->IsDoneWithTraversal(); iter->GoToNextItem())
{
nb++;
}
this->NumBlocks->SetValue(0,nb);
this->ri->AssignVTKDataArrayToRVariable(this->NumBlocks, "VTK_NUMBER_OF_BLOCKS");
}
int bid = 1;
for (iter->InitTraversal(); !iter->IsDoneWithTraversal(); iter->GoToNextItem())
{
if(this->BlockInfoOutput)
{
this->BlockId->SetValue(0,bid);
this->ri->AssignVTKDataArrayToRVariable(this->BlockId, "VTK_BLOCK_ID");
}
this->ProcessInputDataObject(iter->GetCurrentDataObject());
bid++;
}
iter->Delete();
return (1);
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessOutputCompositeDataSet(vtkCompositeDataSet * cdsOut)
{
vtkCompositeDataIterator* iter = cdsOut->NewIterator();
iter->InitTraversal();
for (iter->InitTraversal(); !iter->IsDoneWithTraversal(); iter->GoToNextItem())
{
this->ProcessOutputDataObject(iter->GetCurrentDataObject());
}
iter->Delete();
return (1);
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessInputTable(vtkTable* tIn)
{
if (this->rcfi->PutTableNames.HasName())
{
std::string name = this->rcfi->PutTableNames.NextName();
return this->ProcessInputTable(name, tIn);
}
else
{
return 0;
}
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessInputTable(std::string& name, vtkTable* tIn)
{
if(name.length() > 0)
{
this->ri->AssignVTKTableToRVariable(tIn, name.c_str());
}
return (1);
}
//----------------------------------------------------------------------------
vtkTable* vtkRCalculatorFilter::GetOutputTable(std::string& name)
{
if(name.length() > 0)
{
return this->ri->AssignRVariableToVTKTable(name.c_str());
}
return NULL;
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessOutputTable(vtkTable* tOut)
{
if (rcfi->GetTableNames.HasName())
{
std::string name = rcfi->GetTableNames.NextName();
tOut->ShallowCopy(this->GetOutputTable(name));
return 1;
}
else
{
return 0;
}
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessInputTree(vtkTree* tIn)
{
if (this->rcfi->PutTreeNames.HasName())
{
std::string name = this->rcfi->PutTreeNames.NextName();
return this->ProcessInputTree(name, tIn);
}
else
{
return 0;
}
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessInputTree(std::string& name, vtkTree* tIn)
{
if(name.size() > 0)
{
this->ri->AssignVTKTreeToRVariable(tIn, name.c_str());
}
return (1);
}
//----------------------------------------------------------------------------
vtkTree* vtkRCalculatorFilter::GetOutputTree(std::string& name)
{
if(name.length() > 0)
{
return this->ri->AssignRVariableToVTKTree(name.c_str());
}
return (NULL);
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::ProcessOutputTree(vtkTree* tOut)
{
if (rcfi->GetTreeNames.HasName())
{
std::string name = rcfi->GetTreeNames.NextName();
tOut->ShallowCopy(this->GetOutputTree(name));
return 1;
}
else
{
return 0;
}
}
//----------------------------------------------------------------------------
int vtkRCalculatorFilter::SetRscriptFromFile(const char* fname)
{
FILE *fp;
long len;
long rlen;
if(fname && (strlen(fname) > 0) )
{
fp = fopen(fname,"rb");
if(!fp)
{
vtkErrorMacro(<<"Can't open input file named " << fname);
return(0);
}
fseek(fp,0,SEEK_END);
len = ftell(fp);
fseek(fp,0,SEEK_SET);
delete [] this->RfileScript;
this->RfileScript = new char[len+1];
rlen = static_cast<long>(fread(this->RfileScript,1,len,fp));
this->RfileScript[len] = '\0';
fclose(fp);
if (rlen != len)
{
delete [] this->RfileScript;
this->RfileScript = 0;
vtkErrorMacro(<<"Error reading R script");
return(0);
}