JAccessible.hh

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#ifndef __JLANG__JACCESSIBLE__
#define __JLANG__JACCESSIBLE__
 
#include "JLang/JThrow.hh"
 
 
/**
 * \author mdejong
 */
 
namespace JLANG {}
namespace JPP { using namespace JLANG; }
 
namespace JLANG {
 
 
  /**
   * Interface for named access of a device.
   */
  class JAccessible :
    public JThrow<JAccessible>
  {
  protected:
    /**
     * Default constructor.
     */
    JAccessible()
    {}
 
 
  public:
    /**
     * Virtual destructor.
     */
    virtual ~JAccessible()
    {}
 
 
    /**
     * Check is device is open.
     *
     * \return                 true if open; else false
     */
    virtual bool is_open() const = 0;
 
 
    /**
     * Open device.
     *
     * \param  file_name       file name
     */
    virtual void open(const char* file_name) = 0;
 
 
    /**
     * Close device.
     */
    virtual void close() = 0;
  };
 
 
  /**
   * Interface for null access.
   */
  class JNullAccess :
    public virtual JAccessible
  {
  public:
    /**
     * Check is device is open.
     *
     * \return                 true
     */
    virtual bool is_open() const 
    {
      return true;
    }
 
 
    /**
     * Open device.
     *
     * \param  file_name       file name
     */
    virtual void open(const char* file_name) 
    {}
 
 
    /**
     * Close device.
     */
    virtual void close() 
    {}
  };
}
 
#endif