SettingGroup.h

Go to the documentation of this file.

// Copyright Onix Solutions Limited [OnixS]. All rights reserved.
//
// This software owned by Onix Solutions Limited [OnixS] and is 
// protected by copyright law and international copyright treaties.
//
// Access to and use of the software is governed by the terms of the applicable 
// OnixS Software Services Agreement (the Agreement) and Customer end user license 
// agreements granting a non-assignable, non-transferable and non-exclusive license 
// to use the software for it's own data processing purposes under the terms defined 
// in the Agreement.
//
// Except as otherwise granted within the terms of the Agreement, copying or 
// reproduction of any part of this source code or associated reference material 
// to any other location for further reproduction or redistribution, and any 
// amendments to this copyright notice, are expressly prohibited.
//
// Any reproduction or redistribution for sale or hiring of the Software not in 
// accordance with the terms of the Agreement is a violation of copyright law.
//
 
#pragma once
 
#include <OnixS/CME/ConflatedUDP/String.h>
 
ONIXS_CONFLATEDUDP_NAMESPACE_BEGIN
 
ONIXS_CONFLATEDUDP_LTWT_CLASS_DECL
(
    SettingGroup
);

ONIXS_CONFLATEDUDP_EXPORTED_STRUCT 
SettingAssignController
{
    virtual 
    void 
    beginAssign(
        const SettingGroup&, 
        const Char*) = 0;

    virtual 
    void 
    endAssign() = 0;
};
 
// Default attributes and functionality. 
ONIXS_CONFLATEDUDP_EXPORTED_STRUCT
TrivialAssignController 
: SettingAssignController
{
    void 
    beginAssign(
        const SettingGroup&, 
        const Char*)
    {
    }
    
    void 
    endAssign()
    {
    }

    static 
    SettingAssignController&
    self()
    {
        static
        TrivialAssignController
        trivial;
    
        return trivial;
    }
};

ONIXS_CONFLATEDUDP_LTWT_CLASS SettingAssignGuard
{
    SettingAssignController& controller_;
 
    SettingAssignGuard(
        const SettingAssignGuard&);
 
    SettingAssignGuard& 
    operator =(
        const SettingAssignGuard&);
 
public:
    SettingAssignGuard(
        SettingAssignController& controller, 
        const SettingGroup& group, 
        const Char* details)
        : controller_(controller)
    {
        controller_.beginAssign(group, details);
    }

    ~SettingAssignGuard()
    {
        controller_.endAssign();
    }
};

ONIXS_CONFLATEDUDP_LTWT_CLASS SettingGroup
{
    // Controller for the given group of settings.
    SettingAssignController& controller_;
 
    SettingGroup(
        const SettingGroup&);
 
    SettingGroup&
    operator =(
        const SettingGroup&);
 
public:
    SettingGroup(
        SettingAssignController* 
        controller = NULL)
        : controller_
          (
            controller 
                ? *controller 
                : TrivialAssignController::
                  self()
          )
    {
    }

    ~SettingGroup()
    {
    }

    template
    <
        class Assignee,
        class Value
    >
    void 
    controlAssignment(
        const Char* description, 
        Assignee& assignee, 
        Value value) const 
    {
        const 
        SettingAssignGuard 
        guard(
            controller_, 
            *this, 
            description);
        {
            assignee = value;
        }
    }

    template
    <
        class Assignee, 
        class Value, 
        class AssignRoutine
    >
    void 
    controlAssignment(
        const Char* description, 
        AssignRoutine routine, 
        Assignee& assignee,
        const Value& value) const 
    {
        const 
        SettingAssignGuard
        guard(
            controller_, 
            *this, 
            description);
        {
            (assignee.*routine)(value);
        }
    }

    ONIXS_CONFLATEDUDP_LTWT_EXPORTED
    static
    const SettingGroup&
    null()
    {
        static 
        const 
        SettingGroup 
        nullInstance;
 
        return nullInstance;
    }
};

inline 
bool
operator ==(
    const SettingGroup& left,
    const SettingGroup& right)
{
    return (&left == &right);
}

inline 
bool
operator !=(
    const SettingGroup& left,
    const SettingGroup& right)
{
    return (&left != &right);
}
 
ONIXS_CONFLATEDUDP_NAMESPACE_END