JRedirectString.hh

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#ifndef __JLANG__JREDIRECTSTRING__
#define __JLANG__JREDIRECTSTRING__

#include <istream>
#include <ostream>
#include <string>
#include <sstream>

#include "JLang/JAbstractObjectStatus.hh"


/**
 * \author mdejong
 */

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

namespace JLANG {


  /**
   * This class can be used to temporarily redirect an input stream to an input string.
   * The destructor restores the internal buffer of the input stream.
   */
  class JRedirectString  :
    public JAbstractObjectStatus
  {
  public:
    /**
     * Constructor.
     * The input stream is redirected to the given input string.
     *
     * \param  is              input stream
     * \param  buffer          input string
     */
    JRedirectString(std::istream& is, const std::string& buffer) :
      ios(is)
    {
      p = ios.rdbuf(new std::stringbuf(buffer));
    }
    
    
    /**
     * Destructor.
     * Restore internal buffer and delete temporary buffer.
     */
    ~JRedirectString()
    {
      delete ios.rdbuf(p);
    }

    
    /**
     * Get status of object.
     *
     * \return                 true
     */
    virtual bool getStatus() const override 
    {
      return true;
    }

  private:
    std::ios&       ios;
    std::streambuf* p;
  };
}

#endif