适配器模式是连接两个不兼容接口的桥梁，主要分为三种：类适配器、对象适配器以及接口适配器，本文根据所给的例子使用matlab语言对三种适配器进行实现。
已有的接口和类（ac220v）：
iac220v.m
我要评论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
目标接口：（dc5v，注意两者的方法签名是不同的）
classdef idc5v < handle
methods(abstract)
getdc5v(~);
end
end
类适配器（将ac220v转化成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
对象适配器：
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
接口适配器：
idcoutput.m (定义通用输出接口)
classdef idcoutput < handle
methods(abstract)
getdc5v(~);
getdc12v(~);
end
end
iadapter.m（定义默认适配器接口）
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 (定义具体适配器方法，ac220v输入为例)
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
测试代码
a = classadapter(220,true);
disp(a.getdc5v());
b = objadapter(ac220v(223,true));
disp(b.getdc5v());
c = ac220vadapter(ac220v(221,true));
disp(c.getdc5v())
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