gtsam/wrap/FileWriter.cpp

/**
 * @file FileWriter.cpp
 *
 * @date Jan 15, 2012
 * @author Alex Cunningham
 */

#include "FileWriter.h"
#include "utilities.h"

#include <fstream>
#include <iostream>

using namespace std;
using namespace wrap;

/* ************************************************************************* */
FileWriter::FileWriter(const string& filename, bool verbose,
    const string& comment_str) :
    verbose_(verbose), filename_(filename), comment_str_(comment_str) {
}

/* ************************************************************************* */
void FileWriter::emit(bool add_header, bool force_overwrite) const {
  if (verbose_)
    cerr << "generating " << filename_ << " ";
  // read in file if it exists
  string existing_contents;
  bool file_exists = true;
  try {
    existing_contents = file_contents(filename_.c_str(), add_header);
  } catch (CantOpenFile) {
    file_exists = false;
  }

  // Only write a file if it is new, an update, or overwrite is forced
  string new_contents = oss.str();
  if (force_overwrite || !file_exists || existing_contents != new_contents) {
    // Binary to use LF line endings instead of CRLF
    ofstream ofs(filename_.c_str(), ios::binary);
    if (!ofs)
      throw CantOpenFile(filename_);

    // dump in stringstream
    ofs << new_contents;
    ofs.close();
  }
  if (verbose_)
    cerr << " ...no update" << endl;
}
/* ************************************************************************* */