JGZFileReader.hh

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#ifndef __JLANG__JGZFILEREADER__
#define __JLANG__JGZFILEREADER__

#include <istream>

#include "JLang/gzstream.h"
#include "JLang/JAccessible.hh"
#include "JLang/JStreamObjectIterator.hh"
#include "JLang/JException.hh"


/**
 * \author mdejong
 */

namespace JLANG {}
namespace JPP { using namespace JLANG; }

namespace JLANG {


  /**
   * Object reading from gzipped file.
   *
   * This class implements the JAccessibleObjectIterator interface.
   */
  template<class T>
  class JGZFileReader :
    public igzstream,
    public JStreamObjectIterator    <T>,
    public JAccessibleObjectIterator<T>
  {
  public:
    /**
     * Default constructor.
     */
    JGZFileReader() :
      igzstream(),
      JStreamObjectIterator<T>(static_cast<std::istream&>(*this))
    {}


    /**
     * Constructor.
     *
     * \param  file_name      file name
     */
    JGZFileReader(const char* file_name) :
      JAccessible(),
      igzstream(file_name),
      JStreamObjectIterator<T>(static_cast<std::istream&>(*this))
    {}


    /**
     * Check is file is open.
     *
     * \return                 true if open; else false
     */
    virtual bool is_open() const override 
    {
      return igzstream::is_open();
    }

    
    /**
     * Open file.
     *
     * \param  file_name      file name
     */
    virtual void open(const char* file_name) override 
    {
      igzstream::open(file_name);

      if (!this->is_open()) {
        this->Throw(JFileOpenException(std::string("Error opening file ") + file_name));
      }
    }


    /**
     * Close file.
     */
    virtual void close() override 
    {
      igzstream::close();
    }
  };
}

#endif