text: // --------------------------------------------------------------------------
  //                   OpenMS -- Open-Source Mass Spectrometry
  // --------------------------------------------------------------------------
  // Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
  // ETH Zurich, and Freie Universitaet Berlin 2002-2021.
  //
  // This software is released under a three-clause BSD license:
  //  * Redistributions of source code must retain the above copyright
  //    notice, this list of conditions and the following disclaimer.
  //  * Redistributions in binary form must reproduce the above copyright
  //    notice, this list of conditions and the following disclaimer in the
  //    documentation and/or other materials provided with the distribution.
  //  * Neither the name of any author or any participating institution
  //    may be used to endorse or promote products derived from this software
  //    without specific prior written permission.
  // For a full list of authors, refer to the file AUTHORS.
  // --------------------------------------------------------------------------
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  // ARE DISCLAIMED. IN NO EVENT SHALL ANY OF THE AUTHORS OR THE CONTRIBUTING
  // INSTITUTIONS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  // --------------------------------------------------------------------------
  // $Maintainer: Timo Sachsenberg$
  // $Authors: Marc Sturm, Stephan Aiche $
  // --------------------------------------------------------------------------
  
  #pragma once
  
  #include <OpenMS/CONCEPT/Types.h>
  
  namespace OpenMS
  {
    class String;
  
    /**
      @brief Base class for all classes that want to report their progress.
  
      Per default the progress log is disabled. Use setLogType to enable it.
  
      Use startProgress, setProgress and endProgress for the actual logging.
  
      @note All methods are const, so it can be used through a const reference or in const methods as well!
    */
    class OPENMS_DLLAPI ProgressLogger
    {
  public:
      /// Constructor
      ProgressLogger();
  
      /// Destructor
      virtual ~ProgressLogger();
  
      /// Copy constructor
      ProgressLogger(const ProgressLogger& other);
  
      /// Assignment Operator
      ProgressLogger& operator=(const ProgressLogger& other);
  
      /// Possible log types
      enum LogType
      {
        CMD, ///< Command line progress
        GUI, ///< Progress dialog
        NONE ///< No progress logging
      };
  
      /**
        @brief This class represents an actual implementation of a logger.
      */
      class OPENMS_DLLAPI ProgressLoggerImpl
      {
  public:
        virtual void startProgress(const SignedSize begin, const SignedSize end, const String& label, const int current_recursion_depth) const = 0;
        virtual void setProgress(const SignedSize value, const int current_recursion_depth) const = 0;
        virtual SignedSize nextProgress() const = 0; //< does not print/show anything; returns current progress
        virtual void endProgress(const int current_recursion_depth) const = 0;
  
        virtual ~ProgressLoggerImpl() {}
  
        /// Factory requirements
        static void registerChildren();
  
      };
  
      /// Sets the progress log that should be used. The default type is NONE!
      void setLogType(LogType type) const;
  
      /// Returns the type of progress log being used.
      LogType getLogType() const;
  
      /**
        @brief Initializes the progress display
  
        Sets the progress range from @p begin to @p end.
        If @p begin equals @p end, setProgress only indicates that
        the program is still running, but without showing any absolute progress value.
  
        Sets the label to @p label.
  
        @note Make sure to call setLogType first!
      */
      void startProgress(SignedSize begin, SignedSize end, const String& label) const;
  
      /// Sets the current progress
      void setProgress(SignedSize value) const;
  
      /// Ends the progress display
      void endProgress() const;
  
      /// increment progress by 1 (according to range begin-end)
      void nextProgress() const;
  
  protected:
      mutable LogType type_;
      mutable time_t last_invoke_;
      static int recursion_depth_;
  
      /// Return the name of the factory product used for this log type
      static String logTypeToFactoryName_(LogType type);
  
      mutable ProgressLoggerImpl* current_logger_;
  
    };
  
  } // namespace OpenMS
  
  