/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkProgrammableSource.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.

=========================================================================*/
#include "vtkProgrammableSource.h"
#include "vtkPolyData.h"
#include "vtkStructuredGrid.h"
#include "vtkStructuredPoints.h"
#include "vtkUnstructuredGrid.h"
#include "vtkRectilinearGrid.h"
#include "vtkExecutive.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkCommand.h"

vtkStandardNewMacro(vtkProgrammableSource);

// Construct programmable filter with empty execute method.
vtkProgrammableSource::vtkProgrammableSource()
{
  this->ExecuteMethod = NULL;
  this->ExecuteMethodArg = NULL;
  this->ExecuteMethodArgDelete = NULL;
  this->RequestInformationMethod = NULL;

  this->SetNumberOfInputPorts(0);
  this->SetNumberOfOutputPorts(5);

  vtkDataSet *output;
  output = vtkPolyData::New();
  this->GetExecutive()->SetOutputData(0,output);
  output->Delete();

  output = vtkStructuredPoints::New();
  this->GetExecutive()->SetOutputData(1,output);
  output->Delete();

  output = vtkStructuredGrid::New();
  this->GetExecutive()->SetOutputData(2,output);
  output->Delete();

  output = vtkUnstructuredGrid::New();
  this->GetExecutive()->SetOutputData(3,output);
  output->Delete();

  output = vtkRectilinearGrid::New();
  this->GetExecutive()->SetOutputData(4,output);
  output->Delete();

  this->RequestedDataType = VTK_POLY_DATA;
}

vtkProgrammableSource::~vtkProgrammableSource()
{
  // delete the current arg if there is one and a delete meth
  if ((this->ExecuteMethodArg)&&(this->ExecuteMethodArgDelete))
    {
    (*this->ExecuteMethodArgDelete)(this->ExecuteMethodArg);
    }
}

// Specify the function to use to generate the source data. Note
// that the function takes a single (void *) argument.
void vtkProgrammableSource::SetExecuteMethod(void (*f)(void *),
  void *arg)
{
  if ( f != this->ExecuteMethod || arg != this->ExecuteMethodArg )
    {
    // delete the current arg if there is one and a delete meth
    if ((this->ExecuteMethodArg)&&(this->ExecuteMethodArgDelete))
      {
      (*this->ExecuteMethodArgDelete)(this->ExecuteMethodArg);
      }
    this->ExecuteMethod = f;
    this->ExecuteMethodArg = arg;
    this->Modified();
    }
}

// Set the arg delete method. This is used to free user memory.
void vtkProgrammableSource::SetExecuteMethodArgDelete(
  void (*f)(void *))
{
  if ( f != this->ExecuteMethodArgDelete)
    {
    this->ExecuteMethodArgDelete = f;
    this->Modified();
    }
}

void vtkProgrammableSource::SetRequestInformationMethod(
  void (*f)(void *))
{
  if ( f != this->RequestInformationMethod )
    {
    this->RequestInformationMethod = f;
    this->Modified();
    }
}


// Get the output as a concrete type. This method is typically used by the
// writer of the source function to get the output as a particular type (i.e.,
// it essentially does type casting). It is the users responsibility to know
// the correct type of the output data.
vtkPolyData *vtkProgrammableSource::GetPolyDataOutput()
{
  if (this->GetNumberOfOutputPorts() < 5)
    {
    return NULL;
    }

  this->RequestedDataType = VTK_POLY_DATA;
  return vtkPolyData::SafeDownCast(
    this->GetExecutive()->GetOutputData(0));
}

// Get the output as a concrete type.
vtkStructuredPoints *vtkProgrammableSource::GetStructuredPointsOutput()
{
  if (this->GetNumberOfOutputPorts() < 5)
    {
    return NULL;
    }

  this->RequestedDataType = VTK_STRUCTURED_POINTS;
  return vtkStructuredPoints::SafeDownCast(
    this->GetExecutive()->GetOutputData(1));
}

// Get the output as a concrete type.
vtkStructuredGrid *vtkProgrammableSource::GetStructuredGridOutput()
{
  if (this->GetNumberOfOutputPorts() < 5)
    {
    return NULL;
    }
  
  this->RequestedDataType = VTK_STRUCTURED_GRID;
  return vtkStructuredGrid::SafeDownCast(
    this->GetExecutive()->GetOutputData(2));
}

// Get the output as a concrete type.
vtkUnstructuredGrid *vtkProgrammableSource::GetUnstructuredGridOutput()
{
  if (this->GetNumberOfOutputPorts() < 5)
    {
    return NULL;
    }

  this->RequestedDataType = VTK_UNSTRUCTURED_GRID;
  return vtkUnstructuredGrid::SafeDownCast(
    this->GetExecutive()->GetOutputData(3));
}

// Get the output as a concrete type.
vtkRectilinearGrid *vtkProgrammableSource::GetRectilinearGridOutput()
{
  if (this->GetNumberOfOutputPorts() < 5)
    {
    return NULL;
    }

  this->RequestedDataType = VTK_RECTILINEAR_GRID;
  return vtkRectilinearGrid::SafeDownCast(
    this->GetExecutive()->GetOutputData(4));
}

int vtkProgrammableSource::RequestData(
  vtkInformation *vtkNotUsed(request),
  vtkInformationVector **vtkNotUsed(inputVector),
  vtkInformationVector *vtkNotUsed(outputVector))
{
  vtkDebugMacro(<<"Executing programmable filter");

  // Now invoke the procedure, if specified.
  if ( this->ExecuteMethod != NULL )
    {
    (*this->ExecuteMethod)(this->ExecuteMethodArg);
    }

  return 1;
}

int vtkProgrammableSource::RequestDataObject(
  vtkInformation *,
  vtkInformationVector **,
  vtkInformationVector *outputVector)
{
  vtkInformation *outInfo;
  vtkDataSet *output = 0;
  switch (this->RequestedDataType)
    {
    case VTK_POLY_DATA:
      outInfo = outputVector->GetInformationObject(0);
      if (!outInfo)
        {
        output = vtkPolyData::New();
        }
      else
        {
        output = vtkPolyData::SafeDownCast(
          outInfo->Get(vtkDataObject::DATA_OBJECT()));
        if (!output)
          {
          output = vtkPolyData::New();
          }
        else
          {
          return 1;
          }
        }
      this->GetExecutive()->SetOutputData(0, output);
      output->Delete();
      break;
    case VTK_STRUCTURED_POINTS:
      outInfo = outputVector->GetInformationObject(1);
      if (!outInfo)
        {
        output = vtkStructuredPoints::New();
        }
      else
        {
        output = vtkStructuredPoints::SafeDownCast(
          outInfo->Get(vtkDataObject::DATA_OBJECT()));
        if (!output)
          {
          output = vtkStructuredPoints::New();
          }
        else
          {
          return 1;
          }
        }
      this->GetExecutive()->SetOutputData(1, output);
      output->Delete();
      break;
    case VTK_STRUCTURED_GRID:
      outInfo = outputVector->GetInformationObject(2);
      if (!outInfo)
        {
        output = vtkStructuredGrid::New();
        }
      else
        {
        output = vtkStructuredGrid::SafeDownCast(
          outInfo->Get(vtkDataObject::DATA_OBJECT()));
        if (!output)
          {
          output = vtkStructuredGrid::New();
          }
        else
          {
          return 1;
          }
        }
      this->GetExecutive()->SetOutputData(2, output);
      output->Delete();
      break;
    case VTK_UNSTRUCTURED_GRID:
      outInfo = outputVector->GetInformationObject(3);
      if (!outInfo)
        {
        output = vtkUnstructuredGrid::New();
        }
      else
        {
        output = vtkUnstructuredGrid::SafeDownCast(
          outInfo->Get(vtkDataObject::DATA_OBJECT()));
        if (!output)
          {
          output = vtkUnstructuredGrid::New();
          }
        else
          {
          return 1;
          }
        }
      this->GetExecutive()->SetOutputData(3, output);
      output->Delete();
      break;
    case VTK_RECTILINEAR_GRID:
      outInfo = outputVector->GetInformationObject(4);
      if (!outInfo)
        {
        output = vtkRectilinearGrid::New();
        }
      else
        {
        output = vtkRectilinearGrid::SafeDownCast(
          outInfo->Get(vtkDataObject::DATA_OBJECT()));
        if (!output)
          {
          output = vtkRectilinearGrid::New();
          }
        else
          {
          return 1;
          }
        }
      this->GetExecutive()->SetOutputData(3, output);
      output->Delete();
      break;
    default:
      return 0;
    }
  return 1;
}

int vtkProgrammableSource::RequestInformation(vtkInformation *,
                                              vtkInformationVector **,
                                              vtkInformationVector *)
{
  vtkDebugMacro(<<"requesting information");

  // Now invoke the procedure, if specified.
  if ( this->RequestInformationMethod != NULL )
    {
    (*this->RequestInformationMethod)(NULL);
    }

  return 1;
}