Matlab適配器模式

適配器模式是鏈接兩個不兼容接口的橋樑，主要分爲三種：類適配器、對象適配器以及接口適配器，本文根據https://blog.csdn.net/u012359453/article/details/79165080所給的例子使用matlab語言對三種適配器進行實現。

已有的接口和類（AC220V）：

IAC220V.m

classdef IAC220V < handle
   methods(Abstract)
       getAC220V(~);
   end
end

AC220V.m

classdef AC220V < IAC220V
    properties
        isAC = true;
        voltage = 220;
    end
    methods
        function obj = AC220V(voltage,isAC)
            obj.isAC = isAC;
            obj.voltage = voltage;
        end        
        function [voltage,isAC] = getAC220V(obj)
            voltage = obj.voltage;
            isAC = obj.isAC;
        end
    end
end

目標接口：（DC5V，注意二者的方法簽名是不一樣的）

classdef IDC5V < handle
    methods(Abstract)
       getDC5V(~);
   end
end

類適配器（將AC220V轉化成DC5V）:

classdef ClassAdapter < AC220V & IDC5V
    methods
        function obj = ClassAdapter(voltage,isAC)
            obj = obj@AC220V(voltage,isAC);
        end       
        function [new_voltage,new_isAC] = getDC5V(obj)
           [voltage,isAC] = obj.getAC220V();
           new_voltage = 0;
           new_isAC = false;
           if(isAC)
               new_voltage = voltage / 44;
               new_isAC = false;
           end
        end
    end
end

對象適配器：

classdef ObjAdapter < IDC5V
    properties
        pAC220
    end  
    methods
        function obj = ObjAdapter(pAC220)
            if(metaclass(pAC220) <= ?IAC220V)
                obj.pAC220 = pAC220;
            end
        end       
        function [new_voltage,new_isAC] = getDC5V(obj)
           new_voltage = 0;
           new_isAC = false;
           if(~isempty(obj.pAC220))
               [voltage,isAC] = obj.pAC220.getAC220V();
               if(isAC)
                   new_voltage = voltage / 44;
                   new_isAC = false;
               end
           end
        end
    end
end

接口適配器：

IDCOutput.m (定義通用輸出接口)

classdef IDCOutput < handle
    methods(Abstract)
        getDC5V(~);
        getDC12V(~);
    end
end

IAdapter.m（定義默認適配器接口）

classdef IAdapter < IDCOutput
    properties
        power
    end
    methods
        function obj = IAdapter(power)
            obj.power = power;
        end        
        function [voltage,isAC] = getDC5V(~)
            voltage = 0;
            isAC = false;
        end
        function [voltage,isAC] = getDC12V(~)
            voltage = 0;
            isAC = false;
        end
    end
end

AC220VAdapter.m (定義具體適配器方法，AC220V輸入爲例)

classdef AC220VAdapter < IAdapter
    methods
        function obj = AC220VAdapter(pAC220V)
            obj = obj@IAdapter(pAC220V);
        end      
        function [new_voltage,new_isAC] = getDC5V(obj)
           new_voltage = 0;
           new_isAC = false;
           if(~isempty(obj.power))
               [voltage,isAC] = obj.power.getAC220V();
               if(isAC)
                   new_voltage = voltage / 44;
                   new_isAC = false;
               end
           end
        end
    end
end

測試代碼

a = ClassAdapter(220,true);
disp(a.getDC5V());
 
b = ObjAdapter(AC220V(223,true));
disp(b.getDC5V());
 
c = AC220VAdapter(AC220V(221,true));
disp(c.getDC5V())