Matlab建造者模式

构建者模式又叫建造者模式(builder)，是将一个复杂的对象的构建与它的表示分离，使得同样的构建过程可以创建不同的表示。创建者模式隐藏了复杂对象的创建过程，它把复杂对象的创建过程加以抽象，通过子类继承或者重载的方式，动态的创建具有复合属性的对象。本文以创建计算机为例，使用matlab语言来实现。
computer.m （要构造的复杂对象）

classdef computer < handle
    properties
        name = "";
        cpu = "";
        memory = "";
        disk = "";
    end 
    methods
        function set.name(obj,name)
            obj.name = name;
        end
        function name = get.name(obj)
            name = obj.name;
        end
        function set.cpu(obj,cpu)
            obj.cpu = cpu;
        end
        function cpu = get.cpu(obj)
            cpu = obj.cpu;
        end
        function set.memory(obj,memory)
            obj.memory = memory;
        end
        function memory = get.memory(obj)
            memory = obj.memory;
        end
        function set.disk(obj,disk)
            obj.disk = disk;
        end
        function disk = get.disk(obj)
            disk = obj.disk;
        end
        function showinfo(obj)
            disp("computer:"+obj.name+"{cpu:"+obj.cpu+",memory:"+obj.memory+",disk:"+obj.disk+"}");
        end
    end
end

builder.m （抽象的构造者）

classdef builder < handle
    methods(abstract)
        setname(~,~);
        setcpu(~,~);
        setmemory(~,~);
        setdisk(~,~);
        build(~);
    end
end

concretebuilder.m （具体的构造者）

classdef concretebuilder < builder
    properties
        name = "";
        cpu = "";
        memory = "";
        disk = "";
    end
    methods
        function obj = setname(obj,name)
            obj.name = name;
        end
        function obj = setcpu(obj,cpu)
            obj.cpu = cpu;
        end
        function obj = setmemory(obj,memory)
            obj.memory = memory;
        end
        function obj = setdisk(obj,disk)
            obj.disk = disk;
        end
        function computer = build(obj)
            computer = computer();
            computer.name = obj.name;
            computer.cpu = obj.cpu;
            computer.memory = obj.memory;
            computer.disk = obj.disk;
        end
    end
end

director.m （指导者，负责调用构造对象的逻辑，控制相应的构造顺序）

classdef director
    methods
        function computer = getcomputer(~,builder)
           computer = builder.setname("dell")...
            .setcpu("intel i5")...
            .setmemory("4g")...
            .setdisk("1t")...
            .build();
        end             
    end
end

测试代码：

builder = concretebuilder();
director = director();
computer = director.getcomputer(builder);
computer.showinfo();