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/*
* Copyright (C) 2005-2017 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
* https://www.orfeo-toolbox.org/
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "otbStringUtils.h"
#include "otb_boost_string_header.h"
#include "itkListSample.h"
#include <fstream>
#include <string>
#include <algorithm>
namespace otb
{
/** Utility function to read the data file letter.scale, a CSV type file
* (whitespace separators) with the letter index in first column, followed by
* 16 descriptors. Each descriptor is a pair 'index:value'
*/
template <typename TInput, typename TTarget>
bool ReadDataFile(
const std::string & infname,
itk::SmartPointer<itk::Statistics::ListSample<TInput> > samples,
itk::SmartPointer<itk::Statistics::ListSample<TTarget> > labels)
{
typedef typename itk::Statistics::ListSample<TInput>::MeasurementType IValueType;
typedef typename itk::Statistics::ListSample<TTarget>::MeasurementType TValueType;
std::ifstream ifs;
ifs.open(infname.c_str());
if(!ifs)
{
std::cout<<"Could not read file "<<infname<<std::endl;
return false;
}
labels->SetMeasurementVectorSize(1);
unsigned int nbfeatures = 0;
while (!ifs.eof())
{
std::string line;
std::getline(ifs, line);
boost::algorithm::trim(line);
if(nbfeatures == 0)
{
nbfeatures = std::count(line.begin(),line.end(),' ');
samples->SetMeasurementVectorSize(nbfeatures);
}
if(line.size()>1)
{
TInput sample;
itk::NumericTraits<TInput>::SetLength(sample, nbfeatures);
std::string::size_type pos = line.find_first_of(" ", 0);
// Parse label
TTarget label;
itk::NumericTraits<TTarget>::SetLength(label,1);
label[0] = boost::lexical_cast<TValueType>(line.substr(0, pos));
bool endOfLine = false;
unsigned int id = 0;
while(!endOfLine)
{
std::string::size_type nextpos = line.find_first_of(" ", pos+1);
if(nextpos == std::string::npos)
{
endOfLine = true;
nextpos = line.size();
}
std::string::size_type semicolonpos = line.find_first_of(":", pos+1, nextpos-pos-1);
if (semicolonpos == std::string::npos)
{
id++;
sample[id - 1] = boost::lexical_cast<IValueType>(line.substr(pos+1,nextpos-pos-1));
}
else
{
id = boost::lexical_cast<unsigned int>(line.substr(pos+1,semicolonpos-pos-1));
sample[id - 1] = boost::lexical_cast<IValueType>(
line.substr(semicolonpos+1,nextpos-semicolonpos-1));
}
pos = nextpos;
}
samples->PushBack(sample);
labels->PushBack(label);
}
}
ifs.close();
return true;
}
} // end of namespace otb
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