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@Kenta11(Kenta Arai)

MATLAB言語で学ぶ「Java言語で学ぶデザインパターン入門」ノート #8 Abstract Factory

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概要

Abstract Factory パターンは、複数のインスタンスをまとめて生成するインターフェースを抽象化する、デザインパターンの一つである。

ソースコード

+factory/Item.m
classdef (Abstract) Item < handle
    properties (Access = protected)
        caption {mustBeTextScalar} = ''
    end
    methods (Access = public)
        function obj = Item(caption)
            arguments (Input)
                caption {mustBeTextScalar}
            end
            arguments (Output)
                obj(1,1) factory.Item
            end
            obj.caption = caption;
        end
    end
end
+factory/Link.m
classdef (Abstract) Link < factory.Item
    properties (Access = protected)
        url {mustBeTextScalar} = ''
    end
    methods (Access = public)
        function obj = Link(caption, url)
            arguments (Input)
                caption {mustBeTextScalar}
                url {mustBeTextScalar}
            end
            arguments (Output)
                obj(1,1) factory.Link
            end
            obj = obj@factory.Item(caption);
            obj.url = url;
        end
    end
end
+factory/Tray.m
classdef (Abstract) Tray < factory.Item
    properties (Access = protected)
        tray(1,:) cell = {}
    end
    methods (Access = public)
        function obj = Tray(caption)
            arguments (Input)
                caption {mustBeTextScalar}
            end
            arguments (Output)
                obj(1,1) factory.Tray
            end
            obj = obj@factory.Item(caption);
        end
        function add(obj, item)
            arguments (Input)
                obj(1,1) factory.Tray
                item(1,1) factory.Item
            end
            obj.tray{end + 1} = item;
        end
    end
end
+factory/Page.m
classdef (Abstract) Page < handle
    properties (Access = protected)
        title {mustBeTextScalar} = ''
        author {mustBeTextScalar} = ''
        content(1,:) cell = {}
    end
    methods (Access = public)
        function obj = Page(title, author)
            arguments (Input)
                title {mustBeTextScalar}
                author {mustBeTextScalar}
            end
            arguments (Output)
                obj(1,1) factory.Page
            end
            obj.title = title;
            obj.author = author;
        end
        function add(obj, item)
            arguments (Input)
                obj(1,1) factory.Page
                item(1,1) factory.Item
            end
            obj.content{end + 1} = item;
        end
        function output(obj)
            arguments (Input)
                obj(1,1) factory.Page
            end
            try
                filename = [obj.title, '.html'];
                fileID = fopen(filename, 'w');
                fprintf(fileID, obj.makeHTML());
                fclose(fileID);
                disp([filename, ' を作成しました。']);
            catch e
                disp(e);
            end
        end
    end
    methods (Abstract, Access = public)
        out = makeHTML(obj)
    end
end
+factory/Factory.m
classdef (Abstract) Factory
    methods (Static)
        function factory = getFactory(classname)
            arguments (Input)
                classname {mustBeTextScalar}
            end
            arguments (Output)
                factory(1,1) factory.Factory
            end
            try
                factory = feval(classname);
            catch e
                switch e.identifier
                    case 'MATLAB:UndefinedFunction'
                        fprintf(2, ['クラス ', classname, ' が見つかりません。']);
                    otherwise
                        disp(e);
                end
            end
        end
    end
    methods (Abstract)
        out = createLink(obj, caption, url)
        out = createTray(obj, caption)
        out = createPage(obj, title, author)
    end
end
main.m
function main(concreteFactoryName)
if nargin ~= 1
    disp('Usage: main class.name.of.ConcreteFactory');
    disp('Example 1: main listfactory.ListFactory');
    disp('Example 2: main tablefactory.TableFactory');
    return;
end

import factory.Factory;

factory = Factory.getFactory(concreteFactoryName);

asahi = factory.createLink('朝日新聞', 'http://www.asahi.com/');
yomiuri = factory.createLink('読売新聞', 'http://www.yomiuri.co.jp/');

us_yahoo = factory.createLink('Yahoo!', 'http://www.yahoo.com/');
jp_yahoo = factory.createLink('Yahoo!Japan', 'http://www.yahoo.co.jp/');
excite = factory.createLink('Excite', 'http://www.excite.com/');
google = factory.createLink('Google', 'http://www.google.com/');

traynews = factory.createTray('新聞');
traynews.add(asahi);
traynews.add(yomiuri);

trayyahoo = factory.createTray('Yahoo!');
trayyahoo.add(us_yahoo);
trayyahoo.add(jp_yahoo);

traysearch = factory.createTray('サーチエンジン');
traysearch.add(trayyahoo);
traysearch.add(excite);
traysearch.add(google);

page = factory.createPage('LinkPage', '結城 浩');
page.add(traynews);
page.add(traysearch);
page.output();
end
+listfactory:ListFactory.m
classdef ListFactory < factory.Factory
    methods (Access = public)
        function out = createLink(~, caption, url)
            arguments (Input)
                ~ % listfactory.ListFactory
                caption {mustBeTextScalar}
                url {mustBeTextScalar}
            end
            arguments (Output)
                out(1,1) listfactory.ListLink
            end
            out = listfactory.ListLink(caption, url);
        end
        function out = createTray(~, caption)
            arguments (Input)
                ~ % listfactory.ListFactory
                caption {mustBeTextScalar}
            end
            arguments (Output)
                out(1,1) listfactory.ListTray
            end
            out = listfactory.ListTray(caption);
        end
        function out = createPage(~, title, author)
            arguments (Input)
                ~ % listfactory.ListFactory
                title {mustBeTextScalar}
                author {mustBeTextScalar}
            end
            arguments (Output)
                out(1,1) listfactory.ListPage
            end
            out = listfactory.ListPage(title, author);
        end
    end
end
ListLink.m
classdef ListLink < factory.Link
    methods (Access = public)
        function obj = ListLink(caption, url)
            arguments (Input)
                caption {mustBeTextScalar}
                url {mustBeTextScalar}
            end
            arguments (Output)
                obj(1,1) listfactory.ListLink
            end
            obj = obj@factory.Link(caption, url);
        end
        function out = makeHTML(obj)
            arguments (Input)
                obj(1,1) listfactory.ListLink
            end
            arguments (Output)
                out {mustBeTextScalar}
            end
            out = ['  <li><a href="', obj.url, '">', obj.caption, '</a></li>', newline];
        end
    end
end
ListTray.m
classdef ListTray < factory.Tray
    methods (Access = public)
        function obj = ListTray(caption)
            arguments (Input)
                caption {mustBeTextScalar}
            end
            arguments (Output)
                obj(1,1) listfactory.ListTray
            end
            obj = obj@factory.Tray(caption);
        end
        function out = makeHTML(obj)
            arguments (Input)
                obj(1,1) listfactory.ListTray
            end
            arguments (Output)
                out {mustBeTextScalar}
            end
            out = ['<li>', newline];
            out = [out, obj.caption, newline];
            out = [out, '<ul>', newline];
            for k = 1:length(obj.tray)
                out = [out, obj.tray{k}.makeHTML()];
            end
            out = [out, '</ul>', newline];
            out = [out, '</li>', newline];
        end
    end
end
ListPage.m
classdef ListPage < factory.Page
    methods (Access = public)
        function obj = ListPage(title, author)
            arguments (Input)
                title {mustBeTextScalar}
                author {mustBeTextScalar}
            end
            arguments (Output)
                obj(1,1) listfactory.ListPage
            end
            obj = obj@factory.Page(title, author);
        end
        function out = makeHTML(obj)
            arguments (Input)
                obj(1,1) listfactory.ListPage
            end
            arguments (Output)
                out {mustBeTextScalar}
            end
            out = ['<html><head><title>', obj.title, '</title></head>', newline];
            out = [out, '<body>', newline];
            out = [out, '<h1>', obj.title, '</h1>', newline];
            out = [out, '<ul>', newline];
            for k = 1:length(obj.content)
                out = [out, obj.content{k}.makeHTML()];
            end
            out = [out, '</ul>', newline];
            out = [out, '<hr><address>', obj.author, '</address>'];
            out = [out, '</body></html>'];
        end
    end
end

実行結果

>> main tablefactory.TableFactory
LinkPage.html を作成しました。
ListPage.html
<html><head><title>LinkPage</title></head>
<body>
<h1>LinkPage</h1>
<table width="80%" border="3">
<tr><td>
<table width="100%" border="1"><tr><td bgcolor="#cccccc" align="center" colspan="2"><b>新聞</b></td></tr>
<tr>
<td><a href="http://www.asahi.com/">朝日新聞</a></td>
<td><a href="http://www.yomiuri.co.jp/">読売新聞</a></td>
</tr></table>
</td>
</tr><tr><td>
<table width="100%" border="1"><tr><td bgcolor="#cccccc" align="center" colspan="3"><b>サーチエンジン</b></td></tr>
<tr>
<td>
<table width="100%" border="1"><tr><td bgcolor="#cccccc" align="center" colspan="2"><b>Yahoo!</b></td></tr>
<tr>
<td><a href="http://www.yahoo.com/">Yahoo!</a></td>
<td><a href="http://www.yahoo.co.jp/">Yahoo!Japan</a></td>
</tr></table>
</td>
<td><a href="http://www.excite.com/">Excite</a></td>
<td><a href="http://www.google.com/">Google</a></td>
</tr></table>
</td>
</tr></table>
<hr><address>結城 浩</address></body></html>

ソースコード2

TableFactory.m
classdef TableFactory < factory.Factory
    methods (Access = public)
        function out = createLink(~, caption, url)
            arguments (Input)
                ~ % tablefactory.TableFactory
                caption {mustBeTextScalar}
                url {mustBeTextScalar}
            end
            arguments (Output)
                out(1,1) tablefactory.TableLink
            end
            out = tablefactory.TableLink(caption, url);
        end
        function out = createTray(~, caption)
            arguments (Input)
                ~ % tablefactory.TableFactory
                caption {mustBeTextScalar}
            end
            arguments (Output)
                out(1,1) tablefactory.TableTray
            end
            out = tablefactory.TableTray(caption);
        end
        function out = createPage(~, title, author)
            arguments (Input)
                ~ % tablefactory.TableFactory
                title {mustBeTextScalar}
                author {mustBeTextScalar}
            end
            arguments (Output)
                out(1,1) tablefactory.TablePage
            end
            out = tablefactory.TablePage(title, author);
        end
    end
end
TableLink.m
classdef TableLink < factory.Link
    methods (Access = public)
        function obj = TableLink(caption, url)
            arguments (Input)
                caption {mustBeTextScalar}
                url {mustBeTextScalar}
            end
            arguments (Output)
                obj(1,1) tablefactory.TableLink
            end
            obj = obj@factory.Link(caption, url);
        end
        function out = makeHTML(obj)
            arguments (Input)
                obj(1,1) tablefactory.TableLink
            end
            arguments (Output)
                out {mustBeTextScalar}
            end
            out = ['<td><a href="', obj.url, '">', obj.caption, '</a></td>', newline];
        end
    end
end
TableTray.m
classdef TableTray < factory.Tray
    methods (Access = public)
        function obj = TableTray(caption)
            arguments (Input)
                caption {mustBeTextScalar}
            end
            arguments (Output)
                obj(1,1) tablefactory.TableTray
            end
            obj = obj@factory.Tray(caption);
        end
        function out = makeHTML(obj)
            arguments (Input)
                obj(1,1) tablefactory.TableTray
            end
            arguments (Output)
                out {mustBeTextScalar}
            end
            out = ['<td>', newline];
            out = [out, '<table width="100%%" border="1"><tr>'];
            out = [out, '<td bgcolor="#cccccc" align="center" colspan="', num2str(length(obj.tray)), '"><b>', obj.caption, '</b></td>'];
            out = [out, '</tr>', newline];
            out = [out, '<tr>', newline];
            for k = 1:length(obj.tray)
                out = [out, obj.tray{k}.makeHTML()];
            end
            out = [out, '</tr></table>', newline];
            out = [out, '</td>', newline];
        end
    end
end
TablePage.m
classdef TablePage < factory.Page
    methods (Access = public)
        function obj = TablePage(title, author)
            arguments (Input)
                title {mustBeTextScalar}
                author {mustBeTextScalar}
            end
            arguments (Output)
                obj(1,1) tablefactory.TablePage
            end
            obj = obj@factory.Page(title, author);
        end
        function out = makeHTML(obj)
            arguments (Input)
                obj(1,1) tablefactory.TablePage
            end
            arguments (Output)
                out {mustBeTextScalar}
            end
            out = ['<html><head><title>', obj.title, '</title></head>', newline];
            out = [out, '<body>', newline];
            out = [out, '<h1>', obj.title, '</h1>', newline];
            out = [out, '<table width="80%%" border="3">', newline];
            for k = 1:length(obj.content)
                out = [out, '<tr>', obj.content{k}.makeHTML(), '</tr>'];
            end
            out = [out, '</table>', newline];
            out = [out, '<hr><address>', obj.author, '</address>'];
            out = [out, '</body></html>'];
        end
    end
end

実行結果2

>> main listfactory.ListFactory
LinkPage.html を作成しました。
LinkPage.html

<html><head><title>LinkPage</title></head>
<body>
<h1>LinkPage</h1>
<ul>
<li>
新聞
<ul>
  <li><a href="http://www.asahi.com/">朝日新聞</a></li>
  <li><a href="http://www.yomiuri.co.jp/">読売新聞</a></li>
</ul>
</li>
<li>
サーチエンジン
<ul>
<li>
Yahoo!
<ul>
  <li><a href="http://www.yahoo.com/">Yahoo!</a></li>
  <li><a href="http://www.yahoo.co.jp/">Yahoo!Japan</a></li>
</ul>
</li>
  <li><a href="http://www.excite.com/">Excite</a></li>
  <li><a href="http://www.google.com/">Google</a></li>
</ul>
</li>
</ul>
<hr><address>結城 浩</address></body></html>
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