Matlab建造者模式

構建者模式又叫建造者模式(Builder)，是將一個複雜的對象的構建與它的表示分離，使得一樣的構建過程能夠建立不一樣的表示。建立者模式隱藏了複雜對象的建立過程，它把複雜對象的建立過程加以抽象，經過子類繼承或者重載的方式，動態的建立具備複合屬性的對象。本文以建立計算機爲例，使用Matlab語言來實現。
Computer.m （要構造的複雜對象）

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 （抽象的構造者）

classdef Builder < handle
    methods(Abstract)
        setName(~,~);
        setCPU(~,~);
        setMemory(~,~);
        setDisk(~,~);
        build(~);
    end
end

ConcreteBuilder.m （具體的構造者）

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 （指導者，負責調用構造對象的邏輯，控制相應的構造順序）

classdef Director
    methods
        function computer = getComputer(~,builder)
           computer = builder.setName("dell")...
            .setCPU("intel i5")...
            .setMemory("4G")...
            .setDisk("1T")...
            .build();
        end             
    end
end

測試代碼：

builder = ConcreteBuilder();
director = Director();
computer = director.getComputer(builder);
computer.showInfo();