JRootPrinter.hh

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#ifndef __JROOT__JROOTPRINTER__
#define __JROOT__JROOTPRINTER__

#include <string>
#include <ostream>

#include "JLang/JEquationParameters.hh"
#include "JLang/JException.hh"
#include "JROOT/JRootClass.hh"
#include "JROOT/JRootStreamer.hh"
#include "JROOT/JRootDictionary.hh"

/**
 * \file
 *
 * Print objects in ASCII format using ROOT dictionary.
 * \author mdejong
 */
namespace JROOT {}
namespace JPP { using namespace JROOT; }

namespace JROOT {

  using JLANG::JEquationParameters;
  using JLANG::JParseError;

  /**
   * Auxiliary class for printing objects in ASCII format using JRootWriter.
   */
  struct JRootPrinter {
    /**
     * Get equation parameters.
     *
     * \return                         equation parameters
     */
    static inline JEquationParameters& getEquationParameters()
    {
      static JEquationParameters equation("=", "\n", ".", "");

      return equation;
    }


    /**
     * Set equation parameters.
     *
     * \param  equation                equation parameters
     */
    static inline void setEquationParameters(const JEquationParameters& equation)
    {
      getEquationParameters() = equation;
    }


    /**
     * Write class contents to output.
     *
     * \param  writer          ROOT writer
     * \param  cls             ROOT class
     */
    static inline void print(JRootWriter& writer, const JRootWritableClass& cls)
    {
      if (cls.is_valid()) {
        if (writer.getDictionary().find(cls.getTypename()) != writer.getDictionary().end())
          writer.putObject(cls);
        else
          writer.put(cls);
      }
    }


    /**
     * Write part of object to output using ROOT dictionary.
     *
     * \param  out             output stream
     * \param  object          object
     * \param  key             data member name, optionally separated by division character
     * \param  parameters      equation parameters
     * \param  dictionary      dictionary
     */
    template<class T>
    static inline void print(std::ostream&              out,
                             const T&                   object,
                             const std::string&         key,
                             const JEquationParameters& parameters,
                             const JRootDictionary_t&   dictionary = JRootDictionary::getInstance())
    {
      using namespace std;
      using namespace JPP;

      JRootWritableClass cls(object);

      for (string::size_type il = 0, ir = 0; ir != string::npos && cls.is_valid(); il = ir + 1) {
        ir  = key.substr(il).find(parameters.getDefaultDivision());
        cls = cls.find(key.substr(il, ir - il).c_str());
      }

      if (cls.is_valid()) {

        JRootWriter writer(out, parameters, dictionary);

        print(writer, cls);

      } else {

        THROW(JParseError, "Invalid key " << key);
      }
    }


    /**
     * Write object to output using ROOT dictionary.
     *
     * \param  out             output stream
     * \param  object          object
     * \param  parameters      equation parameters
     * \param  dictionary      dictionary
     */
    template<class T>
    static inline void print(std::ostream&              out,
                             const T&                   object,
                             const JEquationParameters& parameters,
                             const JRootDictionary_t&   dictionary = JRootDictionary::getInstance())
    {
      JRootWriter        writer(out, parameters, dictionary);
      JRootWritableClass cls(object);

      print(writer, cls);
    }


    /**
     * Write part of object to output using ROOT dictionary.
     *
     * \param  out             output stream
     * \param  object          object
     * \param  key             data member name, optionally separated by division character '.'
     * \param  dictionary      dictionary
     */
    template<class T>
    static inline void print(std::ostream&            out,
                             const T&                 object,
                             const std::string&       key,
                             const JRootDictionary_t& dictionary = JRootDictionary::getInstance())
    {
      print(out, object, key, JRootPrinter::getEquationParameters(), dictionary);
    }


    /**
     * Write object to output using ROOT dictionary.
     *
     * \param  out             output stream
     * \param  object          object
     * \param  dictionary      dictionary
     */
    template<class T>
    static inline void print(std::ostream&            out,
                             const T&                 object,
                             const JRootDictionary_t& dictionary = JRootDictionary::getInstance())
    {
      print(out, object, JRootPrinter::getEquationParameters(), dictionary);
    }
  };
}

#endif