/****************************************************************************/
/// @file    OptionsLoader.h
/// @author  Daniel Krajzewicz
/// @author  Michael Behrisch
/// @date    Mon, 17 Dec 2001
/// @version $Id: OptionsLoader.h 18095 2015-03-17 09:39:00Z behrisch $
///
// A SAX-Handler for loading options
/****************************************************************************/
// SUMO, Simulation of Urban MObility; see http://sumo.dlr.de/
// Copyright (C) 2001-2015 DLR (http://www.dlr.de/) and contributors
/****************************************************************************/
//
//   This file is part of SUMO.
//   SUMO is free software: you can redistribute it and/or modify
//   it under the terms of the GNU General Public License as published by
//   the Free Software Foundation, either version 3 of the License, or
//   (at your option) any later version.
//
/****************************************************************************/
#ifndef OptionsLoader_h
#define OptionsLoader_h


// ===========================================================================
// included modules
// ===========================================================================
#ifdef _MSC_VER
#include <windows_config.h>
#else
#include <config.h>
#endif

#include <xercesc/sax/HandlerBase.hpp>
#include <xercesc/sax/AttributeList.hpp>
#include <xercesc/sax/SAXParseException.hpp>
#include <xercesc/sax/SAXException.hpp>
#include <string>


// ===========================================================================
// class declarations
// ===========================================================================
class OptionsCont;


// ===========================================================================
// class definitions
// ===========================================================================
/**
 * @class OptionsLoader
 * @brief A SAX-Handler for loading options
 */
class OptionsLoader : public XERCES_CPP_NAMESPACE::HandlerBase {
public:
    /** @brief Constructor
     */
    OptionsLoader();


    /** destructor */
    ~OptionsLoader();




    /// @name Handlers for the SAX DocumentHandler interface
    /// @{

    /** @brief Called on the occurence of the beginning of a tag
     *
     * Sets the name of the last item
     */
    virtual void startElement(const XMLCh* const name,
                              XERCES_CPP_NAMESPACE::AttributeList& attributes);


    /** @brief Called on the occurence of character data
     *
     * If this occurs inside a single tag it sets the option named
     *  by the tag to the value given by the character data.
     *  This is considered deprecated in favor of attributes.
     * @todo Describe better
     */
    void characters(const XMLCh* const chars, const XERCES3_SIZE_t length);


    /** @brief Called on the end of an element
     *
     * Resets the element name
     */
    void endElement(const XMLCh* const name);
    /// @}




    /// @name Handlers for the SAX ErrorHandler interface
    /// @{

    /** @brief Called on an XML-warning
     *
     * The warning is reported to the the warning-instance of MsgHandler
     */
    void warning(const XERCES_CPP_NAMESPACE::SAXParseException& exception);


    /** @brief Called on an XML-error
     *
     * The warning is reported to the the error-instance of MsgHandler
     */
    void error(const XERCES_CPP_NAMESPACE::SAXParseException& exception);


    /** @brief Called on an XML-fatal error
     *
     * The warning is reported to the the error-instance of MsgHandler
     */
    void fatalError(const XERCES_CPP_NAMESPACE::SAXParseException& exception);
    /// @}



    /** @brief Returns the information whether an error occured */
    bool errorOccured() const;


private:
    /** @brief Tries to set the named option to the given value
     *
     * Also evaluates whether it is a boolean or a filename option and
     *  does the relevant checks / modifications.
     *
     * @param[in] key The name of the option to set
     * @param[in] value The new value for the option
     */
    void setValue(const std::string& key, std::string& value);


    /** @brief Tries to set the named option to the given value
     *
     * Checks the item whether it was default before setting it.
     * Returns the information whether the item was set before (was not a default value)
     *
     * @param[in] name The name of the option to set
     * @param[in] value The new value for the option
     * @return Whether the option could be set
     */
    bool setSecure(const std::string& name, const std::string& value) const;


private:
    /** invalid copy constructor */
    OptionsLoader(const OptionsLoader& s);


    /** invalid assignment operator */
    OptionsLoader& operator=(const OptionsLoader& s);


private:
    /// @brief The information whether an error occured
    bool myError;

    /// @brief The options to fill
    OptionsCont& myOptions;

    /// @brief The name of the currently parsed option
    std::string myItem;

    /// @brief The currently read characters string
    std::string myValue;

};


#endif

/****************************************************************************/

