delegate_service.h

Go to the documentation of this file.

 
/******************************************************************************
The MIT License(MIT)
 
Embedded Template Library.
https://github.com/ETLCPP/etl
https://www.etlcpp.com
 
Copyright(c) 2019 John Wellbelove
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files(the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions :
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
******************************************************************************/
 
#ifndef ETL_DELEGATE_SERVICE_INCLUDED
#define ETL_DELEGATE_SERVICE_INCLUDED
 
#include "platform.h"
#include "nullptr.h"
#include "static_assert.h"
#include "delegate.h"
#include "array.h"
 
namespace etl
{
  //***************************************************************************
  //***************************************************************************
#if ETL_USING_CPP11 && !defined(ETL_DELEGATE_FORCE_CPP03_IMPLEMENTATION)
  template <size_t Range, 
            size_t Offset = 0U,
            const etl::delegate<void(size_t)>* Delegates = nullptr>
  class delegate_service
  {
  public:
 
    typedef etl::delegate<void(size_t)> delegate_type;
 
    //*************************************************************************
    //*************************************************************************
    template <size_t Id>
    void call() const
    {
      ETL_STATIC_ASSERT(Id < (Offset + Range), "Callback Id out of range");
      ETL_STATIC_ASSERT(Id >= Offset,          "Callback Id out of range");
 
      Delegates[Id - Offset](Id);
    }
 
    //*************************************************************************
    //*************************************************************************
    void call(size_t id) const
    {
      if ((id >= Offset) && (id < (Offset + Range)))
      {
        // Call the delegate with the specified Id.
        Delegates[id - Offset](id);
      }
      else
      {
        // Call the 'unhandled' delegate.
        Delegates[Range](id);
      }
    }
  };
#endif
 
  //***************************************************************************
  //***************************************************************************
  template <size_t Range, 
            size_t Offset>
#if ETL_USING_CPP11 && !defined(ETL_DELEGATE_FORCE_CPP03_IMPLEMENTATION)
  class delegate_service<Range, Offset, nullptr>
#else
  class delegate_service
#endif
  {
  public:
 
    typedef etl::delegate<void(size_t)> delegate_type;
 
    //*************************************************************************
    //*************************************************************************
    delegate_service()
    {
      delegate_type default_delegate = delegate_type::create<delegate_service<Range, Offset>, &delegate_service<Range, Offset>::unhandled>(*this);
 
      lookup.fill(default_delegate);
    }
 
    //*************************************************************************
    //*************************************************************************
    template <size_t Id>
    void register_delegate(delegate_type callback)
    {
      ETL_STATIC_ASSERT(Id < (Offset + Range), "Callback Id out of range");
      ETL_STATIC_ASSERT(Id >= Offset, "Callback Id out of range");
 
      lookup[Id - Offset] = callback;
    }
 
    //*************************************************************************
    //*************************************************************************
    void register_delegate(size_t id, delegate_type callback)
    {
      if ((id >= Offset) && (id < (Offset + Range)))
      {
        lookup[id - Offset] = callback;
      }
    }
 
    //*************************************************************************
    //*************************************************************************
    void register_unhandled_delegate(delegate_type callback)
    {
      unhandled_delegate = callback;
    }
 
    //*************************************************************************
    //*************************************************************************
    template <size_t Id>
    void call() const
    {
      ETL_STATIC_ASSERT(Id < (Offset + Range), "Callback Id out of range");
      ETL_STATIC_ASSERT(Id >= Offset, "Callback Id out of range");
 
      lookup[Id - Offset](Id);
    }
 
    //*************************************************************************
    //*************************************************************************
    void call(const size_t id) const
    {
      if ((id >= Offset) && (id < (Offset + Range)))
      {
        // Call the delegate with the specified Id.
        lookup[id - Offset](id);
      }
      else
      {
        // Call the 'unhandled' delegate.
        unhandled(id);
      }
    }
 
  private:
 
    //*************************************************************************
    //*************************************************************************
    void unhandled(size_t id) const
    {
      if (unhandled_delegate.is_valid())
      {
        unhandled_delegate(id);
      }
    }

    delegate_type unhandled_delegate;

    etl::array<delegate_type, Range> lookup;
  };
}
 
#endif