objectsettings.h

// © Copyright 2010 - 2014 BlackTopp Studios Inc.
/* This file is part of The Mezzanine Engine.

    The Mezzanine Engine 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.

    The Mezzanine Engine is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with The Mezzanine Engine.  If not, see <http://www.gnu.org/licenses/>.
*/
/* The original authors have included a copy of the license specified above in the
   'Docs' folder. See 'gpl.txt'
*/
/* We welcome the use of the Mezzanine engine to anyone, including companies who wish to
   Build professional software and charge for their product.

   However there are some practical restrictions, so if your project involves
   any of the following you should contact us and we will try to work something
   out:
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    - If You want to change our code and not add a few hundred MB of stuff to
        your distribution

   These and other limitations could cause serious legal problems if you ignore
   them, so it is best to simply contact us or the Free Software Foundation, if
   you have any questions.

   Joseph Toppi - toppij@gmail.com
   John Blackwood - makoenergy02@gmail.com
*/
#ifndef _objectsettings_h
#define _objectsettings_h

#include "datatypes.h"
#include "vector2.h"
#include "vector3.h"
#include "quaternion.h"
#include "colourvalue.h"
#include "countedptr.h"
#ifndef SWIG
    #include "XML/xml.h"
#endif

namespace Mezzanine
{
    class ObjectSettingSet;
    class ObjectSettingFile;
    class ObjectSettingGroup;
    ///////////////////////////////////////////////////////////////////////////////
    /// @class ObjectSettingSetContainer
    /// @headerfile objectsettings.h
    /// @brief A base class for other classes that store ObjectSettingSet's.
    /// @details
    ///////////////////////////////////////
    class MEZZ_LIB ObjectSettingSetContainer
    {
    public:
        /// @brief Basic container type for @ref ObjectSettingSet storage by this class.
        typedef std::vector<ObjectSettingSet*>   SubSetVector;
        /// @brief Iterator type for @ref ObjectSettingSet instances stored by this class.
        typedef SubSetVector::iterator           SubSetIterator;
        /// @brief Const Iterator type for @ref ObjectSettingSet instances stored by this class.
        typedef SubSetVector::const_iterator     ConstSubSetIterator;
    protected:
        /// @internal
        /// @brief The name of this container.
        String ContainerName;
        /// @internal
        /// @brief A container of @ref ObjectSettingSet instances owned by this container.
        SubSetVector SubSets;
    public:
        /// @brief Class constructor.
        /// @param Name The name of this container.
        ObjectSettingSetContainer(const String& Name);
        /// @brief Class destructor.
        virtual ~ObjectSettingSetContainer();

        ///////////////////////////////////////////////////////////////////////////////
        // Utility

        /// @brief Sets the name of this container.
        /// @param Name The name to be given to this container.
        void SetName(const String& Name);
        /// @brief Gets the name of this container.
        /// @return Returns a const reference to the name of this container.
        ConstString& GetName() const;

        ///////////////////////////////////////////////////////////////////////////////
        // Sub-Set Methods

        /// @brief Creates a new SettingSet as a child of this container.
        /// @param Name The name of the new set to be created.
        /// @return Returns a pointer to the created SettingSet.
        virtual ObjectSettingSet* CreateChildObjectSettingSet(const String& Name);
        /// @brief Adds a SettingSet as a child of this container.
        /// @param ToBeAdded Pointer to the SettingSet to be added.
        virtual void AddChildObjectSettingSet(ObjectSettingSet* ToBeAdded);
        /// @brief Gets a Sub-Set of this container by name.
        /// @remarks This class does not enforce unique names for child sets.  Only settings are forced
        /// to have unique names.  So when searching for an object by name there can be multiples.  Which
        /// one you get is determined by the Which parameter.
        /// @param Name The name of the desired Sub-Set.
        /// @param Which Which named SettingSet to get.  0 for the first, 1 for the second, and so on.
        /// @return Returns a pointer to the named Sub-Set, or NULL if it doesn't exist.
        ObjectSettingSet* GetChildObjectSettingSet(const String& Name, UInt16 Which = 0) const;
        /// @brief Gets a Sub-Set of this container by index.
        /// @param Index The index of the Sub-Set to get.
        /// @return Returns a pointer to the Sub-Set at the specified index.
        ObjectSettingSet* GetChildObjectSettingSet(const Whole& Index) const;
        /// @brief Removes a Sub-Set of this container.
        /// @param ToBeRemoved The Sub-Set to be removed.
        virtual void RemoveChildObjectSettingSet(ObjectSettingSet* ToBeRemoved);
        /// @brief Destroys a Sub-Set of this container.
        /// @param Name The name of the Sub-Set to be destroyed.
        void DestroyChildObjectSettingSet(const String& Name);
        /// @brief Destroys all child Sub-Sets of this container.
        void DestroyAllObjectSettingSets();

        ///////////////////////////////////////////////////////////////////////////////
        // Iterator Access

        /// @brief Gets an iterator to the first subset of settings in this set.
        SubSetIterator SubSetBegin();
        /// @brief Gets a const iterator to the first subset of settings in this set.
        ConstSubSetIterator SubSetBegin() const;
        /// @brief Gets an iterator to one passed the last subset of settings in this set.
        SubSetIterator SubSetEnd();
        /// @brief Gets a const iterator to one passed the last subset of settings in this set.
        ConstSubSetIterator SubSetEnd() const;

        ///////////////////////////////////////////////////////////////////////////////
        // Internal Methods

        /// @internal
        /// @brief Marks this container and relevant parent containers as updated.
        virtual void _MarkUpdated() = 0;
    };//ObjectSettingSetContainer

    ///////////////////////////////////////////////////////////////////////////////
    /// @class ObjectSettingSet
    /// @headerfile objectsettings.h
    /// @brief A class that store's a named set of settings for an object.
    /// @details
    ///////////////////////////////////////
    class MEZZ_LIB ObjectSettingSet : public ObjectSettingSetContainer
    {
    public:
        /// @brief Basic container type for settings stored as name-value pairs in this class.
        typedef std::map<String,String> SettingsMap;
        /// @brief Iterator type for settings stored by this class.
        typedef SettingsMap::iterator SettingsIterator;
        /// @brief Const Iterator type for settings stored by this class.
        typedef SettingsMap::const_iterator ConstSettingsIterator;
    protected:
        friend class ObjectSettingSetContainer;
        /// @internal
        /// @brief A map container storing the settings owned by this set and their values.
        SettingsMap Settings;
        /// @internal
        /// @brief A pointer to the parent container of this ObjectSettingSet.
        ObjectSettingSetContainer* ParentSetOrGroup;
    public:
        /// @brief Class constructor.
        /// @param Name The name of this set.
        ObjectSettingSet(const String& Name);
        /// @brief Class destructor.
        virtual ~ObjectSettingSet();

        ///////////////////////////////////////////////////////////////////////////////
        // Utility

        /// @brief Gets the Parent SettingsSet to this set.
        /// @return Returns a pointer to this object's parent, or NULL if it doesn't have one.
        ObjectSettingSetContainer* GetParentSetOrGroup() const;

        ///////////////////////////////////////////////////////////////////////////////
        // Setting Methods

        /// @brief Sets a setting in this set...of settings.
        /// @param SettingName The name of the new setting.
        /// @param StringValue A String containing the value to be given to this setting.
        void SetSettingValue(const String& SettingName, const String& StringValue);
        /// @brief Gets a String representing the Value currently assigned to the existing setting.
        /// @param SettingName The name of the setting desired.
        /// @return Returns an String containing the requested setting.  If the setting does not exist then the String will be empty.
        String GetSettingValue(const String& SettingName) const;

        ///////////////////////////////////////////////////////////////////////////////
        // Iterator Access

        /// @brief Gets an iterator to the first setting in this set.
        SettingsIterator SettingsBegin();
        /// @brief Gets a const iterator to the first setting in this set.
        ConstSettingsIterator SettingsBegin() const;
        /// @brief Gets an iterator to one passed the last setting in this set.
        SettingsIterator SettingsEnd();
        /// @brief Gets a const iterator to one passed the last setting in this set.
        ConstSettingsIterator SettingsEnd() const;

        ///////////////////////////////////////////////////////////////////////////////
        // Internal Methods

        /// @copydoc ObjectSettingSetContainer::_MarkUpdated()
        void _MarkUpdated();
    };//ObjectSettingSet

    ///////////////////////////////////////////////////////////////////////////////
    /// @class ObjectSettingGroup
    /// @headerfile objectsettings.h
    /// @brief A class that store's a collection of SettingSets that can be applied together.
    /// @details
    ///////////////////////////////////////
    class MEZZ_LIB ObjectSettingGroup : public ObjectSettingSetContainer
    {
    protected:
        /// @internal
        /// @brief A pointer to the @ref ObjectSettingFile instance this setting group will be saved to.
        ObjectSettingFile* OptionalFile;
    public:
        /// @brief Class constructor.
        /// @param Name The name to be given to this group.
        ObjectSettingGroup(const String& Name);
        /// @brief Class destructor.
        virtual ~ObjectSettingGroup();

        ///////////////////////////////////////////////////////////////////////////////
        // Optional File config

        /// @brief Gets the Setting file instance this group will be saved to.
        /// @return Returns a pointer to the setting file this group belongs to.
        ObjectSettingFile* GetOptionalFile() const;
        /// @brief Gets the file name this group will be saved to.
        /// @return Returns a const reference to the currently set file name.  String will be empty if this is not set.
        const String& GetOptionalFileName() const;

        ///////////////////////////////////////////////////////////////////////////////
        // Internal Methods

        /// @copydoc ObjectSettingSetContainer::_MarkUpdated()
        void _MarkUpdated();
        /// @brief Sets the file this group will be saved to.
        /// @param File The file this group should be saved to when saving the configuration.
        void _SetOptionalFile(ObjectSettingFile* File);
    };//ObjectSettingGroup

    ///////////////////////////////////////////////////////////////////////////////
    /// @class ObjectSettingFile
    /// @headerfile objectsettings.h
    /// @brief This class represents a file to be saved containing one or more OhjectSettingGroup's.
    /// @details
    ///////////////////////////////////////
    class MEZZ_LIB ObjectSettingFile
    {
    public:
        /// @brief Basic container type for @ref ObjectSettingGroup storage by this class.
        typedef std::vector< ObjectSettingGroup* >     SaveGroupsContainer;
        /// @brief Iterator type for @ref ObjectSettingGroup instances stored by this class.
        typedef SaveGroupsContainer::iterator          SaveGroupsIterator;
        /// @brief Const Iterator type for @ref ObjectSettingGroup instances stored by this class.
        typedef SaveGroupsContainer::const_iterator    ConstSaveGroupsIterator;
    protected:
        /// @internal
        /// @brief A container of @ref ObjectSettingGroup instances that will be saved to the file representing by this.
        SaveGroupsContainer SaveGroups;
        /// @internal
        /// @brief The name of the file the stored @ref ObjectSettingGroup instances will be saved to.
        String File;
        /// @internal
        /// @brief Stores whether or not the settings have been updated and this file needs to be saved/refreshed.
        Boolean NeedsSave;
    public:
        /// @brief Class constructor.
        /// @param FileName The name of the file the groups in this class will be saved to.
        ObjectSettingFile(const String& FileName);
        /// @brief Class destructor.
        ~ObjectSettingFile();

        ///////////////////////////////////////////////////////////////////////////////
        // File and Group Management

        /// @brief Gets the name of the file.
        /// @return Returns a const reference to the name of this file.
        const String& GetFileName() const;
        /// @brief Sets whether or not this file needs saving.
        /// @param Save Whetehr or not this file has been updated and needs to be saved.
        void SetNeedsSave(Boolean Save);
        /// @brief Gets whether or not this file has been updated and needs to be saved.
        /// @return Returns true if this file needs to be saved, false otherwise.
        Boolean GetNeedsSave() const;

        /// @brief Adds a group to be saved to this file.
        /// @param Group The group to be added to this file.
        void AddGroup(ObjectSettingGroup* Group);
        /// @brief Gets a group being saved to this file.
        /// @param Name The name of the group to get.
        /// @return Returns a pointer to the named group in this file, or NULL if it does not exist in this file.
        ObjectSettingGroup* GetGroup(const String& Name) const;
        /// @brief Removes a group from this file.
        /// @param Group The group to be removed.
        void RemoveGroup(ObjectSettingGroup* Group);
        /// @brief Gets the container with the groups to be saved to this file.
        /// @return Returns a reference to the container containing all the groups that are to be saved to this file.
        SaveGroupsContainer& GetGroups();

        /// @brief Gets an iterator to the first group in this file.
        SaveGroupsIterator SaveGroupsBegin();
        /// @brief Gets a const iterator to the first group in this file.
        ConstSaveGroupsIterator SaveGroupsBegin() const;
        /// @brief Gets an iterator to one-passed the last group in this file.
        SaveGroupsIterator SaveGroupsEnd();
        /// @brief Gets a const iterator to one-passed the last group in this file.
        ConstSaveGroupsIterator SaveGroupsEnd() const;
    };//ObjectSettingsFile

    ///////////////////////////////////////////////////////////////////////////////
    /// @class ObjectSettingsHandler
    /// @headerfile objectsettings.h
    /// @brief An abstract class for other classes that manage groups of settings.
    /// @details
    ///////////////////////////////////////
    class MEZZ_LIB ObjectSettingsHandler
    {
    public:
        /// @brief Basic container type for @ref ObjectSettingGroup storage by this class.
        typedef std::map<String,ObjectSettingGroup*>     SettingGroupContainer;
        /// @brief Iterator type for @ref ObjectSettingGroup instances stored by this class.
        typedef SettingGroupContainer::iterator          SettingGroupIterator;
        /// @brief Const Iterator type for @ref ObjectSettingGroup instances stored by this class.
        typedef SettingGroupContainer::const_iterator    ConstSettingGroupIterator;
        /// @brief Basic container type for @ref ObjectSettingFile storage by this class.
        typedef std::map<String,ObjectSettingFile*>      SettingFilesContainer;
        /// @brief Iterator type for @ref ObjectSettingGroup instances stored by this class.
        typedef SettingFilesContainer::iterator          SettingFilesIterator;
        /// @brief Const Iterator type for @ref ObjectSettingGroup instances stored by this class.
        typedef SettingFilesContainer::const_iterator    ConstSettingFilesIterator;
        /// @brief Convenience typedef for Load method returns.
        typedef std::vector<ObjectSettingGroup*>         SettingGroupVector;
    protected:
        /// @internal
        /// @brief A container storing all the SettingGroups owned by this handler.
        SettingGroupContainer SettingGroups;
        /// @internal
        /// @brief A container storing all the file saving configuration used by this handler.
        SettingFilesContainer SettingFiles;
        /// @internal
        /// @brief Stores whether or not this handler will attempt to automatically generate a path to a file if it doesn't exist.
        Boolean AutoGenPath;
        /// @internal
        /// @brief Stores whether or not this handler will attempt to automatically generate a file if it doesn't exist.
        Boolean AutoGenFiles;
        /// @internal
        /// @brief Stores the path to be used for file IO operations done by this handler.
        String SettingsFilePath;
        /// @internal
        /// @brief Stores the name of the file where the "Current" settings group will be saved to.
        String CurrentSettingsSaveFile;

        /// @internal
        /// @brief Loads all @ref ObjectSettingGroup instances serialized to a XML file into usable @ref ObjectSettingGroup instances.
        /// @param FileName The name of the file to be loaded.
        /// @param Path The path to the file to be loaded.
        /// @return Returns a CountedPtr to a container of the loaded @ref ObjectSettingGroup instances.
        CountedPtr<SettingGroupVector> LoadSettingsFromFile(const String& FileName, const String& Path);
        /// @internal
        /// @brief Saves a collection of ObjectSettingGroups stored by this handler to a file as XML.
        /// @param GroupNames A container storing all the names of of the @ref ObjectSettingGroup instances to be saved.
        /// @param FileName The name of the file to be saved at.
        /// @param Path The path to the file being saved.
        void SaveSettingsToFile(StringVector& GroupNames, const String& FileName, const String& Path);
        /// @internal
        /// @brief Populates an ObjectSettingSet with settings stored in XML.
        /// @param XMLNode The XML node storing the serialized ObjectSettingSet.
        /// @param Set The ObjectSettingSet to be populated with usable settings.
        void LoadSettingSetFromXML(XML::Node& XMLNode, ObjectSettingSet* Set);
        /// @internal
        /// @brief Saves an ObjectSettingSet to an XML node.
        /// @param XMLNode The XML node to be written with the settings of the provided set.
        /// @param Set The ObjectSettingSet to be written to XML.
        void SaveSettingSetToXML(XML::Node& XMLNode, ObjectSettingSet* Set);
        /// @internal
        /// @brief Gets the name to be given to a Node with this handlers serialized data.
        /// @return Returns a String containing the name to be given to the XML::Node storing this handlers data.
        virtual String GetObjectRootNodeName() const = 0;
        /// @internal
        /// @brief Takes all the current settings of this handler and serializes them to an XML::Node.
        /// @param CurrentNode The XML::Node to be populated with this handlers current settings.
        virtual void AppendCurrentSettings(XML::Node& CurrentNode) = 0;
        /// @internal
        /// @brief Applies all the settings stored by a @ref ObjectSettingGroup.
        /// @param Group The @ref ObjectSettingGroup to have all of it's settings applied.
        virtual void ApplySettingGroupImpl(ObjectSettingGroup* Group) = 0;
    public:
        /// @brief Class constructor.
        ObjectSettingsHandler();
        /// @brief Class destructor.
        virtual ~ObjectSettingsHandler();

        ///////////////////////////////////////////////////////////////////////////////
        // Setting Group Handling

        /// @brief Applies all the settings (and their values) defined in a setting group.
        /// @param GroupName The name of the setting group to apply.
        void ApplySettingGroup(const String& GroupName);
        /// @brief Creates a new blank setting group that can have it's settings populated.
        /// @param Name The name to be given to the new settings group.
        /// @return Returns a pointer to the newly created setting group.
        ObjectSettingGroup* CreateSettingGroup(const String& Name);
        /// @brief Gets a setting group by name.
        /// @param Name The name of the setting group to get.
        /// @return Returns a pointer to the named setting group.
        ObjectSettingGroup* GetSettingGroup(const String& Name) const;
        /// @brief Destroys a setting group by name.
        /// @param Name The name of the setting group to destroy.
        void DestroySettingGroup(const String& Name);
        /// @brief Destroys a setting group.
        /// @param ToBeDestroyed A pointer to the group that will be destroyed.
        void DestroySettingGroup(ObjectSettingGroup* ToBeDestroyed);
        /// @brief Destroys all setting groups stored in this handler.
        void DestroyAllSettingGroups();

        ///////////////////////////////////////////////////////////////////////////////
        // Setting File Handling

        /// @brief Creates a new Setting file that will track which groups are a part of it.
        /// @param FileName The name of the file this instance cooresponds to.
        /// @return Returns a pointer to the created ObjectSettingFile.
        ObjectSettingFile* CreateSettingFile(const String& FileName);
        /// @brief Gets a Setting file by name.
        /// @param FileName The name of the setting file to get.
        /// @return Returns a pointer to the named setting file.
        ObjectSettingFile* GetSettingFile(const String& FileName);
        /// @brief Destroys a Setting file by name.
        /// @note This does not destroy any saved files on disk, only the helper class(es) that have been allocated in memory.
        /// @param FileName The name of the setting file to be destroyed.
        void DestroySettingFile(const String& FileName);
        /// @brief Destroys a Setting file.
        /// @note This does not destroy any saved files on disk, only the helper class(es) that have been allocated in memory.
        /// @param ToBeDestroyed The setting file to be destroyed.
        void DestroySettingFile(ObjectSettingFile* ToBeDestroyed);
        /// @brief Destroys all Setting files in this handler.
        /// @note This does not destroy any saved files on disk, only the helper class(es) that have been allocated in memory.
        void DestroyAllSettingFiles();
        /// @brief Assigns a SettingGroup to a file name that will be used when settings are saved.
        /// @param Group The setting group getting it's optional file name updated.
        /// @param FileName The name of the file the provided group will be added to.
        void AddGroupToFile(ObjectSettingGroup* Group, const String& FileName);
        /// @brief Removes a previously assigned group from a save file name.
        /// @param Group The setting group getting removed from it's current optional file name.
        /// @param FileName The name of the file the provided group will be removed from.
        void RemoveGroupFromFile(ObjectSettingGroup* Group, const String& FileName);

        ///////////////////////////////////////////////////////////////////////////////
        // Setting Saving/Path Handling

        /// @brief Sets the path to be assumed when saving/loading settings to files.
        /// @param Path The path to be assumed.
        void SetSettingsFilePath(const String& Path);
        /// @brief Gets the currently set settings file path.
        /// @return Returns a string containing the path to use when a save/load path isn't specified.
        const String& GetSettingsFilePath() const;
        /// @brief Sets the name of the file that will have this object's "current" settings saved to.
        /// @details Any group labeled "Current" (case sensative) will be used and immediately applied upon loading. @n
        /// If this is enabled and no group specifiers are used, then the Current settings will automatically be saved any time the groups are saved.
        /// When using functions with group specifiers, you can include a string "Current" to save the current settings. @n
        /// It's also important to note that the "Current" settings group, although it'll be present in saved files, is not a group traversible in code.
        /// It is solely intended to save the existing state at shutdown, and resume with that exact config.
        /// @param FileName Name of the file to save the current settings to.
        void SetCurrentSettingsSaveFile(const String& FileName);
        /// @brief Gets the name of the file the "Current" setting group is saved to.
        /// @return Returns string ref to the name of the file current settings are being saved to, or an empty string if one is not set.
        ConstString& GetCurrentSettingsSaveFile() const;

        ///////////////////////////////////////////////////////////////////////////////
        // Loading Utilities

        /// @brief Loads settings from a settings file.
        /// @param FileName The name of the file to load and parse.
        /// @param Group The asset group where the file can be found.
        /// @return Returns a vector containing all the setting groups that were created while loading settings.
        CountedPtr<SettingGroupVector> LoadSettingsFromGroup(const String& FileName, const String& Group);
        /// @brief Loads settings from a settings file.
        /// @param FileName The name of the file to load and parse.
        /// @param Path The filesystem path where the file can be found.
        /// @return Returns a vector containing all the setting groups that were created while loading settings.
        CountedPtr<SettingGroupVector> LoadSettings(const String& FileName, const String& Path);
        /// @brief Loads settings from a settings file using the specified settings path.
        /// @note Using this function means it will use the preset settings file path stored in this handler.
        /// The path must be set before calling this.
        /// @param FileName The name of the file to load and parse.
        /// @return Returns a vector containing all the setting groups that were created while loading settings.
        CountedPtr<SettingGroupVector> LoadSettings(const String& FileName);
        /// @brief Loads settings from an xml node.
        /// @param RootSettings The node that reprsents the root of the settings group or groups.
        /// @return Returns a vector containing all the setting groups that were created while loading settings.
        CountedPtr<SettingGroupVector> LoadSettingsFromXML(XML::Node& RootSettings);

        ///////////////////////////////////////////////////////////////////////////////
        // Saving Utilities

        /// @brief Enables or disables the automatic creation of a directory path when saving.
        /// @param Enable True to allow this object to create folders in the intended save path allowing the path to be valid, false otherwise.
        void SetAutoGenPath(Boolean Enable);
        /// @brief Gets whether or not this object is currently allowed to create folders when saving.
        /// @return Returns true if this object will create folders in paths it uses to force the path to be valid.
        Boolean GetAutoGenPath() const;
        /// @brief Enables or disables the automatic creation of settings files on initialization and destruction of this object.
        /// @param Enable True to allow this object to save it's settings sets to a file on initialization and destruction.
        void SetAutoGenFiles(Boolean Enable);
        /// @brief Gets whether or not this object is currently allowed to create/update settings files upon initialization and destruction.
        /// @return Returns true if this object will generate or update settings files when it is initialized and destruction.
        Boolean GetAutoGenFiles() const;

        /// @brief Saves all settings that need saving.
        /// @remarks This function does a few things.  First it will only save the setting groups which have their optional setting
        /// files specified, which is automatically set if they are loaded from a file.  Second, it will only save the files(and
        /// their collection of Setting Groups) that are marked as needing saving to prevent unnessessary IO.
        void SaveAllSettings();
        /// @brief Saves all settings that have their optional filename set to the specified file.
        /// @param Filename The optional filename that will be used to determine which groups will be saved, and to what file.
        /// @param Path The path to place the file being saved.
        void SaveSettingsByFile(const String& FileName, const String& Path);
        /// @brief Saves all settings that have their optional filename set to the specified file.
        /// @note Using this function means it will use the preset settings file path stored in this handler.
        /// The path must be set before calling this.
        /// @param Filename The optional filename that will be used to determine which groups will be saved, and to what file.
        void SaveSettingsByFile(const String& FileName);
        /// @brief Saves all settings to a settings file.
        /// @remarks This function bypasses the file utilities offered by this class and just writes the specified groups to the named
        /// file.  It will not make a coresponding file class and this file will not be auto saved at any point later.  This is just an
        /// explicit utility function for writing groups to the disk should you need it.  In general it is better to create a file class
        /// and populate it with groups yourself.
        /// @param GroupNames A string vector containing the names for all the settings groups to save.
        /// @param Filename The name of the file to save the current settings to.
        /// @param Path The path to place the file being saved.
        void SaveSettingGroups(StringVector& GroupNames, const String& FileName, const String& Path);
        /// @brief Saves all settings to a settings file using the specified settings path.
        /// @note Using this function means it will use the preset settings file path stored in this handler.
        /// The path must be set before calling this otherwise an exception will be thrown.
        /// @remarks This function bypasses the file utilities offered by this class and just writes the specified groups to the named
        /// file.  It will not make a coresponding file class and this file will not be auto saved at any point later.  This is just an
        /// explicit utility function for writing groups to the disk should you need it.  In general it is better to create a file class
        /// and populate it with groups yourself.
        /// @param GroupNames A string vector containing the names for all the settings groups to save.
        /// @param Filename The name of the file to save the current settings to.
        void SaveSettingGroups(StringVector& GroupNames, const String& FileName);
        /// @brief Saves all the current setting groups as children of the provided XML node.
        /// @param SaveCurrent Whether or not to also save the current settings to XML.
        /// @param RootSettings The node to populate with all currently loaded settings groups.
        void SaveSettingsToXML(XML::Node& RootSettings, Boolean SaveCurrent = true);
        /// @brief Saves the named settings groups as children of the provided XML node.
        /// @param GroupNames A string vector containing the names for all the settings groups to save.
        /// @param RootSettings The node to populate with all currently loaded settings groups.
        void SaveSettingsToXML(StringVector& GroupNames, XML::Node& RootSettings);
    };//ObjectSettingsHandler
}//Mezzanine

#endif