JFileScanner.hh

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#ifndef __JSUPPORT__JFILESCANNER__
#define __JSUPPORT__JFILESCANNER__
 
#include <string>
 
#include "JLang/JObjectReader.hh"
#include "JLang/JException.hh"
#include "Jeep/JPrint.hh"
#include "JROOT/JRootFileReader.hh"
#include "JIO/JBinaryFileReader.hh"
#include "JSupport/JDAQFileReader.hh"
#include "JSupport/JMonteCarloFileReader.hh"
#include "JSupport/JFilenameSupportkit.hh"
 
 
/**
 * \author mdejong
 */
 
namespace JSUPPORT {}
namespace JPP { using namespace JSUPPORT; }
 
namespace JSUPPORT {
 
  using JLANG::JAccessibleObjectReader;
  using JLANG::JProtocolException;
  using JLANG::JFileOpenException;
 
 
  /**
   * Object reading from file.
   *
   * This class implements the method open of the JLANG::JAccessible interface.
   * The file format is derived from the file name extension.
   */
  template<class T>
  class JFileScanner :
    public JAccessibleObjectReader<T>
  {
  public:
 
    typedef typename JAccessibleObjectReader<T>::helper_type      helper_type;
 
    /**
     * Default constructor.
     */
    JFileScanner()
    {}
 
 
    /**
     * Constructor.
     *
     * \param  file_name  file name
     */
    JFileScanner(const char* file_name)
    {
      open(file_name);
    }
 
 
    /**
     * Destructor.
     */
    ~JFileScanner()
    {
      if (this->is_open()) {
        this->close();
      }
    }
 
 
    /**
     * Open file.
     *
     * \param  file_name  file name
     */
    virtual void open(const char* file_name) override 
    {
      using namespace std;
      using namespace JPP;
 
      JAccessible::Throw(true);
 
      if      (getProtocol(file_name)          == ROOT_FILE_FORMAT)
        this->reset(new JRootFileReader<T>());
      else if (getFilenameExtension(file_name) == ROOT_FILE_FORMAT)
        this->reset(new JRootFileReader<T>());
      else if (getFilenameExtension(file_name) == DAQ_FILE_FORMAT)
        this->reset(new JDAQFileReader<T>());
      else if (getFilenameExtension(file_name) == JPP_FILE_FORMAT)
        this->reset(new JBinaryFileReader<T>());
      else if (getFilenameExtension(file_name) == MONTE_CARLO_FILE_FORMAT)
        this->reset(new JMonteCarloASCIIFileReader<T>());
      else if (getFilenameExtension(file_name) == GZIP_FILE_FORMAT) 
        this->reset(new JMonteCarloGZFileReader<T>());
      else
        this->Throw(JProtocolException(MAKE_STRING("Protocol not defined: " << file_name)));
 
      if (this->is_valid()) {
 
        this->get()->open(file_name);
 
        if (!this->get()->is_open()) {
          if (getFilenameExtension(file_name) != ROOT_FILE_FORMAT) {
            JAccessible::Throw(JFileOpenException("File not opened."));
          }
        }
      }
    }
 
 
    /**
     * Close device.
     */
    virtual void close() override
    {
      if (this->is_valid()) {
        this->get()->close();
        this->reset();
      }
    }
  };
}
 
#endif