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<div class="section" id="factories">
<h1>Factories<a class="headerlink" href="#factories" title="Permalink to this headline">¶</a></h1>
<div class="section" id="the-factory-class">
<h2>The Factory Class<a class="headerlink" href="#the-factory-class" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.interface</span> <span class="kn">import</span> <span class="n">Interface</span>
<span class="gp">>>> </span><span class="k">class</span> <span class="nc">IFunction</span><span class="p">(</span><span class="n">Interface</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">>>> </span><span class="k">class</span> <span class="nc">IKlass</span><span class="p">(</span><span class="n">Interface</span><span class="p">):</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.interface</span> <span class="kn">import</span> <span class="n">implements</span>
<span class="gp">>>> </span><span class="k">class</span> <span class="nc">Klass</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="gp">... </span> <span class="n">implements</span><span class="p">(</span><span class="n">IKlass</span><span class="p">)</span>
<span class="gp">...</span>
<span class="gp">... </span> <span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kw</span><span class="p">):</span> <span class="c">#*</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">args</span> <span class="o">=</span> <span class="n">args</span>
<span class="gp">... </span> <span class="bp">self</span><span class="o">.</span><span class="n">kw</span> <span class="o">=</span> <span class="n">kw</span>
<span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.factory</span> <span class="kn">import</span> <span class="n">Factory</span>
<span class="gp">>>> </span><span class="n">factory</span> <span class="o">=</span> <span class="n">Factory</span><span class="p">(</span><span class="n">Klass</span><span class="p">,</span> <span class="s">'Klass'</span><span class="p">,</span> <span class="s">'Klassier'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">factory2</span> <span class="o">=</span> <span class="n">Factory</span><span class="p">(</span><span class="k">lambda</span> <span class="n">x</span><span class="p">:</span> <span class="n">x</span><span class="p">,</span> <span class="s">'Func'</span><span class="p">,</span> <span class="s">'Function'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">factory3</span> <span class="o">=</span> <span class="n">Factory</span><span class="p">(</span><span class="k">lambda</span> <span class="n">x</span><span class="p">:</span> <span class="n">x</span><span class="p">,</span> <span class="s">'Func'</span><span class="p">,</span> <span class="s">'Function'</span><span class="p">,</span> <span class="p">(</span><span class="n">IFunction</span><span class="p">,))</span>
</pre></div>
</div>
<div class="section" id="calling-a-factory">
<h3>Calling a Factory<a class="headerlink" href="#calling-a-factory" title="Permalink to this headline">¶</a></h3>
<p>Here we test whether the factory correctly creates the objects and
including the correct handling of constructor elements.</p>
<p>First we create a factory that creates instanace of the <cite>Klass</cite> class:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">factory</span> <span class="o">=</span> <span class="n">Factory</span><span class="p">(</span><span class="n">Klass</span><span class="p">,</span> <span class="s">'Klass'</span><span class="p">,</span> <span class="s">'Klassier'</span><span class="p">)</span>
</pre></div>
</div>
<p>Now we use the factory to create the instance</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">kl</span> <span class="o">=</span> <span class="n">factory</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="n">foo</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">bar</span><span class="o">=</span><span class="mi">4</span><span class="p">)</span>
</pre></div>
</div>
<p>and make sure that the correct class was used to create the object:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">kl</span><span class="o">.</span><span class="n">__class__</span>
<span class="go"><class 'Klass'></span>
</pre></div>
</div>
<p>Since we passed in a couple positional and keyword arguments</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">kl</span><span class="o">.</span><span class="n">args</span>
<span class="go">(1, 2)</span>
<span class="gp">>>> </span><span class="n">kl</span><span class="o">.</span><span class="n">kw</span>
<span class="go">{'foo': 3, 'bar': 4}</span>
<span class="gp">>>> </span><span class="n">factory2</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="go">3</span>
<span class="gp">>>> </span><span class="n">factory3</span><span class="p">(</span><span class="mi">3</span><span class="p">)</span>
<span class="go">3</span>
</pre></div>
</div>
</div>
<div class="section" id="title-and-description">
<h3>Title and Description<a class="headerlink" href="#title-and-description" title="Permalink to this headline">¶</a></h3>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">factory</span><span class="o">.</span><span class="n">title</span>
<span class="go">'Klass'</span>
<span class="gp">>>> </span><span class="n">factory</span><span class="o">.</span><span class="n">description</span>
<span class="go">'Klassier'</span>
<span class="gp">>>> </span><span class="n">factory2</span><span class="o">.</span><span class="n">title</span>
<span class="go">'Func'</span>
<span class="gp">>>> </span><span class="n">factory2</span><span class="o">.</span><span class="n">description</span>
<span class="go">'Function'</span>
<span class="gp">>>> </span><span class="n">factory3</span><span class="o">.</span><span class="n">title</span>
<span class="go">'Func'</span>
<span class="gp">>>> </span><span class="n">factory3</span><span class="o">.</span><span class="n">description</span>
<span class="go">'Function'</span>
</pre></div>
</div>
</div>
<div class="section" id="provided-interfaces">
<h3>Provided Interfaces<a class="headerlink" href="#provided-interfaces" title="Permalink to this headline">¶</a></h3>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">implemented</span> <span class="o">=</span> <span class="n">factory</span><span class="o">.</span><span class="n">getInterfaces</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">implemented</span><span class="o">.</span><span class="n">isOrExtends</span><span class="p">(</span><span class="n">IKlass</span><span class="p">)</span>
<span class="go">True</span>
<span class="gp">>>> </span><span class="nb">list</span><span class="p">(</span><span class="n">implemented</span><span class="p">)</span>
<span class="go">[<InterfaceClass __builtin__.IKlass>]</span>
<span class="gp">>>> </span><span class="n">implemented2</span> <span class="o">=</span> <span class="n">factory2</span><span class="o">.</span><span class="n">getInterfaces</span><span class="p">()</span>
<span class="gp">>>> </span><span class="nb">list</span><span class="p">(</span><span class="n">implemented2</span><span class="p">)</span>
<span class="go">[]</span>
<span class="gp">>>> </span><span class="n">implemented3</span> <span class="o">=</span> <span class="n">factory3</span><span class="o">.</span><span class="n">getInterfaces</span><span class="p">()</span>
<span class="gp">>>> </span><span class="nb">list</span><span class="p">(</span><span class="n">implemented3</span><span class="p">)</span>
<span class="go">[<InterfaceClass __builtin__.IFunction>]</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="the-component-architecture-factory-api">
<h2>The Component Architecture Factory API<a class="headerlink" href="#the-component-architecture-factory-api" title="Permalink to this headline">¶</a></h2>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">zope.component</span>
<span class="gp">>>> </span><span class="n">factory</span> <span class="o">=</span> <span class="n">Factory</span><span class="p">(</span><span class="n">Klass</span><span class="p">,</span> <span class="s">'Klass'</span><span class="p">,</span> <span class="s">'Klassier'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">gsm</span> <span class="o">=</span> <span class="n">zope</span><span class="o">.</span><span class="n">component</span><span class="o">.</span><span class="n">getGlobalSiteManager</span><span class="p">()</span>
<span class="gp">>>> </span><span class="kn">from</span> <span class="nn">zope.component.interfaces</span> <span class="kn">import</span> <span class="n">IFactory</span>
<span class="gp">>>> </span><span class="n">gsm</span><span class="o">.</span><span class="n">registerUtility</span><span class="p">(</span><span class="n">factory</span><span class="p">,</span> <span class="n">IFactory</span><span class="p">,</span> <span class="s">'klass'</span><span class="p">)</span>
</pre></div>
</div>
<div class="section" id="creating-an-object">
<h3>Creating an Object<a class="headerlink" href="#creating-an-object" title="Permalink to this headline">¶</a></h3>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">kl</span> <span class="o">=</span> <span class="n">zope</span><span class="o">.</span><span class="n">component</span><span class="o">.</span><span class="n">createObject</span><span class="p">(</span><span class="s">'klass'</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="n">foo</span><span class="o">=</span><span class="mi">3</span><span class="p">,</span> <span class="n">bar</span><span class="o">=</span><span class="mi">4</span><span class="p">)</span>
<span class="gp">>>> </span><span class="nb">isinstance</span><span class="p">(</span><span class="n">kl</span><span class="p">,</span> <span class="n">Klass</span><span class="p">)</span>
<span class="go">True</span>
<span class="gp">>>> </span><span class="n">kl</span><span class="o">.</span><span class="n">args</span>
<span class="go">(1, 2)</span>
<span class="gp">>>> </span><span class="n">kl</span><span class="o">.</span><span class="n">kw</span>
<span class="go">{'foo': 3, 'bar': 4}</span>
</pre></div>
</div>
</div>
<div class="section" id="accessing-provided-interfaces">
<h3>Accessing Provided Interfaces<a class="headerlink" href="#accessing-provided-interfaces" title="Permalink to this headline">¶</a></h3>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">implemented</span> <span class="o">=</span> <span class="n">zope</span><span class="o">.</span><span class="n">component</span><span class="o">.</span><span class="n">getFactoryInterfaces</span><span class="p">(</span><span class="s">'klass'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">implemented</span><span class="o">.</span><span class="n">isOrExtends</span><span class="p">(</span><span class="n">IKlass</span><span class="p">)</span>
<span class="go">True</span>
<span class="gp">>>> </span><span class="p">[</span><span class="n">iface</span> <span class="k">for</span> <span class="n">iface</span> <span class="ow">in</span> <span class="n">implemented</span><span class="p">]</span>
<span class="go">[<InterfaceClass __builtin__.IKlass>]</span>
</pre></div>
</div>
</div>
<div class="section" id="list-of-all-factories">
<h3>List of All Factories<a class="headerlink" href="#list-of-all-factories" title="Permalink to this headline">¶</a></h3>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="p">[(</span><span class="n">name</span><span class="p">,</span> <span class="n">fac</span><span class="o">.</span><span class="n">__class__</span><span class="p">)</span> <span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">fac</span> <span class="ow">in</span>
<span class="gp">... </span> <span class="n">zope</span><span class="o">.</span><span class="n">component</span><span class="o">.</span><span class="n">getFactoriesFor</span><span class="p">(</span><span class="n">IKlass</span><span class="p">)]</span>
<span class="go">[(u'klass', <class 'zope.component.factory.Factory'>)]</span>
</pre></div>
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<h3><a href="index.html">Table Of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">Factories</a><ul>
<li><a class="reference internal" href="#the-factory-class">The Factory Class</a><ul>
<li><a class="reference internal" href="#calling-a-factory">Calling a Factory</a></li>
<li><a class="reference internal" href="#title-and-description">Title and Description</a></li>
<li><a class="reference internal" href="#provided-interfaces">Provided Interfaces</a></li>
</ul>
</li>
<li><a class="reference internal" href="#the-component-architecture-factory-api">The Component Architecture Factory API</a><ul>
<li><a class="reference internal" href="#creating-an-object">Creating an Object</a></li>
<li><a class="reference internal" href="#accessing-provided-interfaces">Accessing Provided Interfaces</a></li>
<li><a class="reference internal" href="#list-of-all-factories">List of All Factories</a></li>
</ul>
</li>
</ul>
</li>
</ul>
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