rootfile_helper.h

Go to the documentation of this file.

// Copyright (C) 2011 Lutz Foucar

/**
 * @file rootfile_helper.h contains singleton definition for creating root files
 *
 * @author Lutz Foucar
 */

#ifndef _ROOTFILE_HELPER_H_
#define _ROOTFILE_HELPER_H_

#include <string>
#include <map>

#include <QtCore/QMutex>

class TFile;

namespace cass
{
/** root file creation
 *
 * create an instance of a rootfile and return it. In case ROOT file aready
 * exists return the instance of that root file.
 *
 * @author Lutz Foucar
 */
class ROOTFileHelper
{
private:
  /** make default constructor private */
  ROOTFileHelper() {}

  /** easier code */
  typedef std::map<std::string,TFile *> rootfiles_t;

public:
  /** create and return an instance of the rootfile
   *
   * create an instance of the root file with the given parameters. If the
   * rootfile already exists don't create a new one but return the one already
   * existing
   *
   * @return an instance of the TFile
   * @param rootfilename filename of the rootfile
   * @param options string containing the option with which the root file
   *                should be opened.
   *
   */
  static TFile* create(const std::string& rootfilename,
                       const std::string& options = "RECREATE");

  /** close root file
   *
   * @param rootfile pointer to the root file instance. pointer should be the
   *                 same as the one returned in create()
   */
  static void close(TFile* rootfile);

private:
  /** container for all the root files */
  static rootfiles_t _rootfiles;

  /** Singleton Mutex to lock write operations*/
  static QMutex _mutex;
};
}

#endif