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	<title>Saga do programador &#187; design</title>
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		<title>Analisando o codigo escrito anteriormente.</title>
		<link>http://www.sagadoprogramador.com.br/2009/12/analisando-o-codigo-escrito-anteriormente/</link>
		<comments>http://www.sagadoprogramador.com.br/2009/12/analisando-o-codigo-escrito-anteriormente/#comments</comments>
		<pubDate>Sat, 12 Dec 2009 16:42:57 +0000</pubDate>
		<dc:creator>Sergio Azevedo</dc:creator>
				<category><![CDATA[Java]]></category>
		<category><![CDATA[OO]]></category>
		<category><![CDATA[design]]></category>
		<category><![CDATA[principios]]></category>
		<category><![CDATA[principiosOO]]></category>

		<guid isPermaLink="false">http://www.sagadoprogramador.com.br/?p=381</guid>
		<description><![CDATA[Terminei meu post anterior com a pergunta: &#8220;Este código está bom? Porque?&#8221; Para analizar um código, assim como qualquer outra coisa, nós precisamos de parâmetros. Precisamos nos basear em algo que saibamos que seja bom, para assim podermos determinar se outra coisa é tão boa quanto, melhor, ou até pior. Com código não é diferente. [...]]]></description>
			<content:encoded><![CDATA[<p>Terminei meu post <a href="http://www.sagadoprogramador.com.br/2009/10/esse-codigo-que-acabei-de-escrever-esta-bom/">anterior</a> com a pergunta: &#8220;Este código está bom? Porque?&#8221;</p>
<p>Para analizar um código, assim como qualquer outra coisa, nós precisamos de parâmetros. Precisamos nos basear em algo que saibamos que seja bom, para assim podermos determinar se outra coisa é tão boa quanto, melhor, ou até pior.</p>
<p>Com código não é diferente. Então antes de respondermos a pergunta feita no inicio deste texto, precisamos definir o que é um código bom, ou melhor, que caracteristicas deve ter um codigo para ser considerado bom. Vamos agora recorrer a alguns principios OO para nos municiar de paramêtros para assim julgarmos o codigo em questão</p>
<p><a href="http://www.objectmentor.com/omTeam/martin_r.html">Robert Martin</a>, o uncle Bob, escreveu a muito tempo sobre os principios OO num documento chamado: <a href="http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod">PrinciplesOfOod</a>. Dos principios OO descritos neste artigo, pelo menos 5 ficaram bastante famosos, e são conhecidos pela sigla <strong>SOLID</strong>, são eles:<br />
<span id="more-381"></span><br />
<strong><a href="http://www.codingefficiency.com/2009/07/18/solid-s-single-responsibility-principle/">S</a></strong><a href="http://www.codingefficiency.com/2009/07/18/solid-s-single-responsibility-principle/">ingle Responsibility Principle (SRP)</a> &#8211; <em>A classe deve ter uma única responsabilidade, uma única razão de existir.</em></p>
<p><em><span style="font-style: normal;"><strong><a href="http://www.codingefficiency.com/2009/07/20/solid-o-open-closed-principle/">O</a></strong><a href="http://www.codingefficiency.com/2009/07/20/solid-o-open-closed-principle/">pen Closed Principle (OCP)</a> &#8211; <em>A classe deve ser aberta para extensão (sublcasses e sobrescrita de metodos) e fechada para modifiação *</em></span></em></p>
<p><strong><a href="http://www.codingefficiency.com/2009/07/21/solid-l-liskov-substitution-principle/">L</a></strong><a href="http://www.codingefficiency.com/2009/07/21/solid-l-liskov-substitution-principle/">iskov Substitution Principle (LSP)</a> &#8211; <em>Resumidamente ele serve para nos aletar para heranças sem sentido.</em></p>
<p><strong><a href="http://www.codingefficiency.com/2009/07/23/solid-i-interface-segregation-principle/">I</a></strong><a href="http://www.codingefficiency.com/2009/07/23/solid-i-interface-segregation-principle/">nterface Segregation Principle (ISP)</a> &#8211; <em>Defende que uma classe deve depender apenas dos métodos que usa de uma outra classe. Interfaces são um mecanismo para isso.</em></p>
<p><strong><a href="http://www.codingefficiency.com/2009/07/27/solid-d-dependency-inversion-principle/">D</a></strong><span><a href="http://www.codingefficiency.com/2009/07/27/solid-d-dependency-inversion-principle/">ependency Inversion Principle</a></span><a href="http://www.codingefficiency.com/2009/07/27/solid-d-dependency-inversion-principle/"> (ISP)</a> &#8211; <em>Defende que componentes maiores devem depender não de componentes menores, mas sim de uma abstração deles.</em></p>
<p><em>*Pode ser discutido, principalmente se você estiver trabalhando em um modelo de dominio incremental, ou seja, você vai descobrindo as necessidades de suas classes durante o desenvolvimento de software. Neste cenário o principio OCP pode ser radical demais. Lembre-se é preciso ter bom senso.</em></p>
<p>Dos principios descritos por Robert Martin, ficaremos apenas com o SRP. Sabendo agora que <em>uma classe deve possuir apenas uma úncia responsabilidade.</em> Quantas responsabilidades podemos identificar na classe Principal do post <a href="http://www.sagadoprogramador.com.br/2009/10/esse-codigo-que-acabei-de-escrever-esta-bom/">anterior</a>?</p>
<p>Podemos identificar facilmente 3 responsabilidades. São elas:</p>
<p>1 &#8211; Controla a execução da aplicação.</p>
<p>2 &#8211; Cadastra um novo DVD</p>
<p>3 &#8211; Lista todos os DVD&#8217;s cadastrados</p>
<p>Agora ficou facil ver que a classe Principal está <em>ferindo </em>o SRP. A resposabilidade desta classe deveria ser apenas: <em>Controlar a execução da aplicação. </em>Precisamos retirar da classe Principal as demais responsabilidades. Como faremos isso?</p>
<p>A melhor solução é remover todo o código &#8220;extra&#8221; da classe Principal. Mas o grande problema, é que sem esse codigo nossa aplicação vai parar de funcionar! Este código não pode simplesmente desaparecer. O que nós precisamos fazer e leva-lo para outro lugar. E como estamos programando segundo o paradigma de Orientação a Objetos, vamos precisar de novas classes para cada uma das responsabilidades descritas acima.</p>
<p>Teriamos as seguintes classes com as seguintes responsabilidades:</p>
<p><em><span style="color: #333399;">Classe</span><span style="color: #0000ff;">:</span></em><em> Principal </em></p>
<p><em><span style="color: #333399;">Responsabilidade</span></em><em>: Controlar a execucao da aplicação</em></p>
<p><em><span style="color: #333399;">Classe</span><span style="color: #0000ff;">:</span> CadastrarDvd </em></p>
<p><em><em><span style="color: #333399;">Responsabilidade</span></em><em>:</em> Cuidar da lógica de inclusao de um dvd</em></p>
<p><em><span style="color: #333399;">Classe</span><span style="color: #0000ff;">:</span> ListarTodosDvds</em></p>
<p><em><em><span style="color: #333399;">Responsabilidade</span></em><em>:</em> Cuidar da lógica de exibicao dos dvd&#8217;s</em></p>
<p>Após estas alterações vamos perceber que a classe Principal ficou bem melhor.</p>
<p>Mas será que isso foi suficiente? Apenas esta alteração terá salvado a vida de nossa pequena aplicação?</p>
<p>Tente aplicar você mesmo o SRP em nossas novas classes e comente a respeito. No proximo post continuamos nossa <em>saga</em>.</p>
<p>Abraços.</p>
<p>Sergio Azevedo Junior</p>
<p>Confira abaixo como ficaram nossas classes:</p>
<p>Principal</p>

<div class="wp_syntax"><div class="code"><pre class="java" style="font-family:monospace;"><span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000000; font-weight: bold;">class</span> <span style="color: #003399;">Principal</span> <span style="color: #009900;">&#123;</span>
  <span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000000; font-weight: bold;">static</span> <span style="color: #000066; font-weight: bold;">void</span> main<span style="color: #009900;">&#40;</span><span style="color: #003399;">String</span><span style="color: #009900;">&#91;</span><span style="color: #009900;">&#93;</span> args<span style="color: #009900;">&#41;</span> <span style="color: #000000; font-weight: bold;">throws</span> <span style="color: #003399;">IOException</span> <span style="color: #009900;">&#123;</span>
    Scanner scan <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Scanner<span style="color: #009900;">&#40;</span><span style="color: #003399;">System</span>.<span style="color: #006633;">in</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #000066; font-weight: bold;">int</span> opcao <span style="color: #339933;">=</span> <span style="color: #cc66cc;">0</span><span style="color: #339933;">;</span>
    <span style="color: #000000; font-weight: bold;">do</span> <span style="color: #009900;">&#123;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;--------------- Controle de Dvds e Cds ---------------&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;   1 - Cadastrar Novo Dvd &quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;   2 - Listar Dvd's &quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;   3 - Terminar &quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;------------------------------------------------------&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot; Escolha uma opção:--&amp;gt; &quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
      opcao <span style="color: #339933;">=</span> scan.<span style="color: #006633;">nextInt</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #000000; font-weight: bold;">switch</span> <span style="color: #009900;">&#40;</span>opcao<span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
      <span style="color: #000000; font-weight: bold;">case</span> <span style="color: #cc66cc;">1</span><span style="color: #339933;">:</span> <span style="color: #009900;">&#123;</span>
        <span style="color: #000000; font-weight: bold;">new</span> CadastraDvd<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span>.<span style="color: #006633;">executa</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #000000; font-weight: bold;">break</span><span style="color: #339933;">;</span>
      <span style="color: #009900;">&#125;</span>
      <span style="color: #000000; font-weight: bold;">case</span> <span style="color: #cc66cc;">2</span><span style="color: #339933;">:</span> <span style="color: #009900;">&#123;</span>
        <span style="color: #000000; font-weight: bold;">new</span> ListaTodosDvds<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span>.<span style="color: #006633;">executa</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #000000; font-weight: bold;">break</span><span style="color: #339933;">;</span>
      <span style="color: #009900;">&#125;</span>
      <span style="color: #009900;">&#125;</span>
    <span style="color: #009900;">&#125;</span> <span style="color: #000000; font-weight: bold;">while</span> <span style="color: #009900;">&#40;</span>opcao <span style="color: #339933;">&amp;</span>lt<span style="color: #339933;">;</span> <span style="color: #cc66cc;">3</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
  <span style="color: #009900;">&#125;</span>
<span style="color: #009900;">&#125;</span></pre></div></div>

<p>CadastraDvds</p>

<div class="wp_syntax"><div class="code"><pre class="java" style="font-family:monospace;"><span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000000; font-weight: bold;">class</span> CadastraDvd <span style="color: #009900;">&#123;</span>
&nbsp;
  <span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000066; font-weight: bold;">void</span> executa<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span> <span style="color: #000000; font-weight: bold;">throws</span> <span style="color: #003399;">IOException</span> <span style="color: #009900;">&#123;</span>
    <span style="color: #003399;">PrintStream</span> ps <span style="color: #339933;">=</span> <span style="color: #000066; font-weight: bold;">null</span><span style="color: #339933;">;</span>
    <span style="color: #003399;">File</span> file <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> <span style="color: #003399;">File</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Dvds.txt&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #003399;">BufferedReader</span> br <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> <span style="color: #003399;">BufferedReader</span><span style="color: #009900;">&#40;</span><span style="color: #000000; font-weight: bold;">new</span> <span style="color: #003399;">InputStreamReader</span><span style="color: #009900;">&#40;</span><span style="color: #003399;">System</span>.<span style="color: #006633;">in</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #000000; font-weight: bold;">try</span> <span style="color: #009900;">&#123;</span>
      ps <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> <span style="color: #003399;">PrintStream</span><span style="color: #009900;">&#40;</span>file<span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
      Dvd dvd <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Dvd<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Titulo.: &quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      dvd.<span style="color: #006633;">setTitulo</span><span style="color: #009900;">&#40;</span>br.<span style="color: #006633;">readLine</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Sinopse: &quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      dvd.<span style="color: #006633;">setSinopse</span><span style="color: #009900;">&#40;</span>br.<span style="color: #006633;">readLine</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Genero.: &quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      dvd.<span style="color: #006633;">setGenero</span><span style="color: #009900;">&#40;</span>br.<span style="color: #006633;">readLine</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Ano....: &quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      dvd.<span style="color: #006633;">setAno</span><span style="color: #009900;">&#40;</span>br.<span style="color: #006633;">readLine</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Duracao: &quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      dvd.<span style="color: #006633;">setDuracao</span><span style="color: #009900;">&#40;</span>br.<span style="color: #006633;">readLine</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
      ps.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span>dvd.<span style="color: #006633;">getTitulo</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      ps.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span>dvd.<span style="color: #006633;">getSinopse</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      ps.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span>dvd.<span style="color: #006633;">getGenero</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      ps.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span>dvd.<span style="color: #006633;">getAno</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      ps.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span>dvd.<span style="color: #006633;">getDuracao</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #009900;">&#125;</span> <span style="color: #000000; font-weight: bold;">finally</span> <span style="color: #009900;">&#123;</span>
      br.<span style="color: #006633;">close</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
      <span style="color: #000000; font-weight: bold;">if</span> <span style="color: #009900;">&#40;</span>ps <span style="color: #339933;">!=</span> <span style="color: #000066; font-weight: bold;">null</span><span style="color: #009900;">&#41;</span>
        ps.<span style="color: #006633;">close</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #009900;">&#125;</span>
  <span style="color: #009900;">&#125;</span>
<span style="color: #009900;">&#125;</span></pre></div></div>

<p>ListaTodosDvds</p>

<div class="wp_syntax"><div class="code"><pre class="java" style="font-family:monospace;"><span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000000; font-weight: bold;">class</span> ListaTodosDvds <span style="color: #009900;">&#123;</span>
  <span style="color: #000000; font-weight: bold;">public</span> <span style="color: #000066; font-weight: bold;">void</span> executa<span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span> <span style="color: #000000; font-weight: bold;">throws</span> <span style="color: #003399;">FileNotFoundException</span> <span style="color: #009900;">&#123;</span>
    <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;------------- Lista de Dvd's -------------&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    Scanner reader <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Scanner<span style="color: #009900;">&#40;</span><span style="color: #000000; font-weight: bold;">new</span> <span style="color: #003399;">File</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Dvds.txt&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #000000; font-weight: bold;">while</span> <span style="color: #009900;">&#40;</span>reader.<span style="color: #006633;">hasNext</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#123;</span>
      <span style="color: #003399;">System</span>.<span style="color: #006633;">out</span>.<span style="color: #006633;">println</span><span style="color: #009900;">&#40;</span>reader.<span style="color: #006633;">nextLine</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
    <span style="color: #009900;">&#125;</span>
    reader.<span style="color: #006633;">close</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
  <span style="color: #009900;">&#125;</span>
<span style="color: #009900;">&#125;</span></pre></div></div>

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