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vtkBoostSplitTableField.cxx
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vtkBoostSplitTableField.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkBoostSplitTableField.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 "vtkBoostSplitTableField.h"
#include "vtkAbstractArray.h"
#include "vtkCommand.h"
#include "vtkDataSetAttributes.h"
#include "vtkObjectFactory.h"
#include "vtkStringArray.h"
#include "vtkTable.h"
#include "vtkVariantArray.h"
#include <boost/algorithm/string/trim.hpp>
#include <boost/tokenizer.hpp>
vtkStandardNewMacro(vtkBoostSplitTableField);
/// Ecapsulates private implementation details of vtkBoostSplitTableField
class vtkBoostSplitTableField::implementation
{
public:
typedef boost::char_separator<char> delimiter_t;
typedef boost::tokenizer<delimiter_t> tokenizer_t;
typedef std::vector<tokenizer_t*> tokenizers_t;
static void GenerateRows(const tokenizers_t& tokenizers, const unsigned int column_index, vtkVariantArray* input_row, vtkVariantArray* output_row, vtkTable* output_table)
{
if(column_index == tokenizers.size())
{
output_table->InsertNextRow(output_row);
return;
}
tokenizer_t* const tokenizer = tokenizers[column_index];
vtkVariant input_value = input_row->GetValue(column_index);
if(tokenizer && input_value.IsString())
{
const std::string value = input_value.ToString();
tokenizer->assign(value);
for(tokenizer_t::iterator token = tokenizer->begin(); token != tokenizer->end(); ++token)
{
output_row->SetValue(column_index, boost::trim_copy(*token).c_str());
GenerateRows(tokenizers, column_index + 1, input_row, output_row, output_table);
}
}
else
{
output_row->SetValue(column_index, input_value);
GenerateRows(tokenizers, column_index + 1, input_row, output_row, output_table);
}
}
};
vtkBoostSplitTableField::vtkBoostSplitTableField() :
Fields(vtkStringArray::New()),
Delimiters(vtkStringArray::New())
{
}
vtkBoostSplitTableField::~vtkBoostSplitTableField()
{
this->Delimiters->Delete();
this->Fields->Delete();
}
void vtkBoostSplitTableField::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
void vtkBoostSplitTableField::ClearFields()
{
this->Fields->Initialize();
this->Delimiters->Initialize();
this->Modified();
}
void vtkBoostSplitTableField::AddField(const char* field, const char* delimiters)
{
assert(field);
assert(delimiters);
this->Fields->InsertNextValue(field);
this->Delimiters->InsertNextValue(delimiters);
this->Modified();
}
int vtkBoostSplitTableField::RequestData(
vtkInformation*,
vtkInformationVector** inputVector,
vtkInformationVector* outputVector)
{
vtkTable* const input = vtkTable::GetData(inputVector[0]);
vtkTable* const output = vtkTable::GetData(outputVector);
// If the number of fields and delimiters don't match, we're done ...
if(this->Fields->GetNumberOfValues() != this->Delimiters->GetNumberOfValues())
{
vtkErrorMacro("The number of fields and the number of delimiters must match");
return 0;
}
// If no fields were specified, we don't do any splitting - just shallow copy ...
if(0 == this->Fields->GetNumberOfValues())
{
output->ShallowCopy(input);
return 1;
}
// Setup the columns for our output table ...
for(vtkIdType i = 0; i < input->GetNumberOfColumns(); ++i)
{
vtkAbstractArray* const column = input->GetColumn(i);
vtkAbstractArray* const new_column = vtkAbstractArray::CreateArray(column->GetDataType());
new_column->SetName(column->GetName());
new_column->SetNumberOfComponents(column->GetNumberOfComponents());
output->AddColumn(new_column);
if(input->GetRowData()->GetPedigreeIds() == column)
{
output->GetRowData()->SetPedigreeIds(new_column);
}
new_column->Delete();
}
// Setup a tokenizer for each column that will be split ...
implementation::tokenizers_t tokenizers;
for(vtkIdType column = 0; column < input->GetNumberOfColumns(); ++column)
{
tokenizers.push_back(static_cast<implementation::tokenizer_t*>(0));
for(vtkIdType field = 0; field < this->Fields->GetNumberOfValues(); ++field)
{
if(this->Fields->GetValue(field) == input->GetColumn(column)->GetName())
{
tokenizers[column] = new implementation::tokenizer_t(std::string(), implementation::delimiter_t(this->Delimiters->GetValue(field)));
break;
}
}
}
// Iterate over each row in the input table, generating one-to-many rows in the output table ...
vtkVariantArray* const output_row = vtkVariantArray::New();
output_row->SetNumberOfValues(input->GetNumberOfColumns());
for(vtkIdType i = 0; i < input->GetNumberOfRows(); ++i)
{
vtkVariantArray* const input_row = input->GetRow(i);
implementation::GenerateRows(tokenizers, 0, input_row, output_row, output);
double progress = static_cast<double>(i) / static_cast<double>(input->GetNumberOfRows());
this->InvokeEvent(vtkCommand::ProgressEvent, &progress);
}
output_row->Delete();
// Cleanup tokenizers ...
for(implementation::tokenizers_t::iterator tokenizer = tokenizers.begin(); tokenizer != tokenizers.end(); ++tokenizer)
delete *tokenizer;
return 1;
}