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<div class="section" id="module-sqlobject.classregistry">
<span id="sqlobject-classregistry-module"></span><h1>sqlobject.classregistry module<a class="headerlink" href="#module-sqlobject.classregistry" title="Permalink to this headline">¶</a></h1>
<dl class="docutils">
<dt>classresolver.py</dt>
<dd>2 February 2004, Ian Bicking <<a class="reference external" href="mailto:ianb%40colorstudy.com">ianb<span>@</span>colorstudy<span>.</span>com</a>></dd>
</dl>
<p>Resolves strings to classes, and runs callbacks when referenced
classes are created.</p>
<p>Classes are referred to only by name, not by module. So that
identically-named classes can coexist, classes are put into individual
registries, which are keyed on strings (names). These registries are
created on demand.</p>
<p>Use like:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">classregistry</span>
<span class="gp">>>> </span><span class="n">registry</span> <span class="o">=</span> <span class="n">classregistry</span><span class="o">.</span><span class="n">registry</span><span class="p">(</span><span class="s1">'MyModules'</span><span class="p">)</span>
<span class="gp">>>> </span><span class="k">def</span> <span class="nf">afterMyClassExists</span><span class="p">(</span><span class="bp">cls</span><span class="p">):</span>
<span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="s1">'Class finally exists: </span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="bp">cls</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">registry</span><span class="o">.</span><span class="n">addClassCallback</span><span class="p">(</span><span class="s1">'MyClass'</span><span class="p">,</span> <span class="n">afterMyClassExists</span><span class="p">)</span>
<span class="gp">>>> </span><span class="k">class</span> <span class="nc">MyClass</span><span class="p">:</span>
<span class="gp">... </span> <span class="k">pass</span>
<span class="gp">>>> </span><span class="n">registry</span><span class="o">.</span><span class="n">addClass</span><span class="p">(</span><span class="n">MyClass</span><span class="p">)</span>
<span class="go">Class finally exists: MyClass</span>
</pre></div>
</div>
<dl class="class">
<dt id="sqlobject.classregistry.ClassRegistry">
<em class="property">class </em><code class="descclassname">sqlobject.classregistry.</code><code class="descname">ClassRegistry</code><span class="sig-paren">(</span><em>name</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/sqlobject/classregistry.html#ClassRegistry"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#sqlobject.classregistry.ClassRegistry" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <code class="xref py py-class docutils literal notranslate"><span class="pre">object</span></code></p>
<p>We’ll be dealing with classes that reference each other, so
class C1 may reference C2 (in a join), while C2 references
C1 right back. Since classes are created in an order, there
will be a point when C1 exists but C2 doesn’t. So we deal
with classes by name, and after each class is created we
try to fix up any references by replacing the names with
actual classes.</p>
<p>Here we keep a dictionaries of class names to classes – note
that the classes might be spread among different modules, so
since we pile them together names need to be globally unique,
to just module unique.
Like needSet below, the container dictionary is keyed by the
class registry.</p>
<dl class="method">
<dt id="sqlobject.classregistry.ClassRegistry.addCallback">
<code class="descname">addCallback</code><span class="sig-paren">(</span><em>callback</em>, <em>*args</em>, <em>**kw</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/sqlobject/classregistry.html#ClassRegistry.addCallback"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#sqlobject.classregistry.ClassRegistry.addCallback" title="Permalink to this definition">¶</a></dt>
<dd><p>This callback is called for all classes, not just specific
ones (like addClassCallback).</p>
</dd></dl>
<dl class="method">
<dt id="sqlobject.classregistry.ClassRegistry.addClass">
<code class="descname">addClass</code><span class="sig-paren">(</span><em>cls</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/sqlobject/classregistry.html#ClassRegistry.addClass"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#sqlobject.classregistry.ClassRegistry.addClass" title="Permalink to this definition">¶</a></dt>
<dd><p>Everytime a class is created, we add it to the registry, so
that other classes can find it by name. We also call any
callbacks that are waiting for the class.</p>
</dd></dl>
<dl class="method">
<dt id="sqlobject.classregistry.ClassRegistry.addClassCallback">
<code class="descname">addClassCallback</code><span class="sig-paren">(</span><em>className</em>, <em>callback</em>, <em>*args</em>, <em>**kw</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/sqlobject/classregistry.html#ClassRegistry.addClassCallback"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#sqlobject.classregistry.ClassRegistry.addClassCallback" title="Permalink to this definition">¶</a></dt>
<dd><p>Whenever a name is substituted for the class, you can register
a callback that will be called when the needed class is
created. If it’s already been created, the callback will be
called immediately.</p>
</dd></dl>
<dl class="method">
<dt id="sqlobject.classregistry.ClassRegistry.allClasses">
<code class="descname">allClasses</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="reference internal" href="../_modules/sqlobject/classregistry.html#ClassRegistry.allClasses"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#sqlobject.classregistry.ClassRegistry.allClasses" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<dl class="method">
<dt id="sqlobject.classregistry.ClassRegistry.getClass">
<code class="descname">getClass</code><span class="sig-paren">(</span><em>className</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/sqlobject/classregistry.html#ClassRegistry.getClass"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#sqlobject.classregistry.ClassRegistry.getClass" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
</dd></dl>
<dl class="function">
<dt id="sqlobject.classregistry.findClass">
<code class="descclassname">sqlobject.classregistry.</code><code class="descname">findClass</code><span class="sig-paren">(</span><em>name</em>, <em>class_registry=None</em><span class="sig-paren">)</span><a class="reference internal" href="../_modules/sqlobject/classregistry.html#findClass"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#sqlobject.classregistry.findClass" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
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