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<h1>Source code for terminatorlib.borg</h1><div class="highlight"><pre>
<span class="c">#!/usr/bin/python</span>
<span class="c"># Terminator by Chris Jones &lt;cmsj@tenshu.net&gt;</span>
<span class="c"># GPL v2 only</span>
<span class="sd">&quot;&quot;&quot;borg.py - We are the borg. Resistance is futile.</span>
<span class="sd">http://code.activestate.com/recipes/66531/</span>
<span class="sd">ActiveState&#39;s policy appears to be that snippets</span>
<span class="sd">exist to encourage re-use, but I can not find any</span>
<span class="sd">specific licencing terms.</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="kn">from</span> <span class="nn">util</span> <span class="kn">import</span> <span class="n">dbg</span>
<span class="c"># pylint: disable-msg=R0903</span>
<span class="c"># pylint: disable-msg=R0921</span>
<div class="viewcode-block" id="Borg"><a class="viewcode-back" href="../../terminatorlib.html#terminatorlib.borg.Borg">[docs]</a><span class="k">class</span> <span class="nc">Borg</span><span class="p">:</span>
<span class="sd">&quot;&quot;&quot;Definition of a class that can never be duplicated. Correct usage is</span>
<span class="sd"> thus:</span>
<span class="sd"> </span>
<span class="sd"> &gt;&gt;&gt; from borg import Borg</span>
<span class="sd"> &gt;&gt;&gt; class foo(Borg):</span>
<span class="sd"> ... # All attributes on a borg class *must* = None</span>
<span class="sd"> ... attribute = None</span>
<span class="sd"> ... def __init__(self):</span>
<span class="sd"> ... Borg.__init__(self, self.__class__.__name__)</span>
<span class="sd"> ... def prepare_attributes(self):</span>
<span class="sd"> ... if not self.attribute:</span>
<span class="sd"> ... self.attribute = []</span>
<span class="sd"> ...</span>
<span class="sd"> &gt;&gt;&gt; bar = foo()</span>
<span class="sd"> &gt;&gt;&gt; bar.prepare_attributes()</span>
<span class="sd"> </span>
<span class="sd"> The important thing to note is that all attributes of borg classes *must* be</span>
<span class="sd"> declared as being None. If you attempt to use static class attributes you</span>
<span class="sd"> will get unpredicted behaviour. Instead, prepare_attributes() must be called</span>
<span class="sd"> which will then see the attributes in the shared state, and initialise them</span>
<span class="sd"> if necessary.&quot;&quot;&quot;</span>
<span class="n">__shared_state</span> <span class="o">=</span> <span class="p">{}</span>
<div class="viewcode-block" id="Borg.__init__"><a class="viewcode-back" href="../../terminatorlib.html#terminatorlib.borg.Borg.__init__">[docs]</a> <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="n">borgtype</span><span class="o">=</span><span class="bp">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;Class initialiser. Overwrite our class dictionary with the shared</span>
<span class="sd"> state. This makes us identical to every other instance of this class</span>
<span class="sd"> type.&quot;&quot;&quot;</span>
<span class="k">if</span> <span class="n">borgtype</span> <span class="ow">is</span> <span class="bp">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s">&#39;Borg::__init__: You must pass a borgtype&#39;</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">__shared_state</span><span class="o">.</span><span class="n">has_key</span><span class="p">(</span><span class="n">borgtype</span><span class="p">):</span>
<span class="n">dbg</span><span class="p">(</span><span class="s">&#39;Borg::__init__: Preparing borg state for </span><span class="si">%s</span><span class="s">&#39;</span> <span class="o">%</span> <span class="n">borgtype</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">__shared_state</span><span class="p">[</span><span class="n">borgtype</span><span class="p">]</span> <span class="o">=</span> <span class="p">{}</span>
<span class="bp">self</span><span class="o">.</span><span class="n">__dict__</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">__shared_state</span><span class="p">[</span><span class="n">borgtype</span><span class="p">]</span>
</div>
<div class="viewcode-block" id="Borg.prepare_attributes"><a class="viewcode-back" href="../../terminatorlib.html#terminatorlib.borg.Borg.prepare_attributes">[docs]</a> <span class="k">def</span> <span class="nf">prepare_attributes</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;This should be used to prepare any attributes of the borg class.&quot;&quot;&quot;</span>
<span class="k">raise</span> <span class="ne">NotImplementedError</span><span class="p">(</span><span class="s">&#39;prepare_attributes&#39;</span><span class="p">)</span>
</pre></div></div></div>
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