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Module gmNull
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<h1 class="epydoc">Source Code for <a href="Gnumed.pycommon.gmNull-module.html">Module Gnumed.pycommon.gmNull</a></h1>
<pre class="py-src">
<a name="L1"></a><tt class="py-lineno"> 1</tt> <tt class="py-line"><tt class="py-docstring">"""null.py</tt> </tt>
<a name="L2"></a><tt class="py-lineno"> 2</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L3"></a><tt class="py-lineno"> 3</tt> <tt class="py-line"><tt class="py-docstring">This is a sample implementation of the 'Null Object' design pattern.</tt> </tt>
<a name="L4"></a><tt class="py-lineno"> 4</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L5"></a><tt class="py-lineno"> 5</tt> <tt class="py-line"><tt class="py-docstring">Roughly, the goal with Null objects is to provide an 'intelligent'</tt> </tt>
<a name="L6"></a><tt class="py-lineno"> 6</tt> <tt class="py-line"><tt class="py-docstring">replacement for the often used primitive data type None in Python or</tt> </tt>
<a name="L7"></a><tt class="py-lineno"> 7</tt> <tt class="py-line"><tt class="py-docstring">Null (or Null pointers) in other languages. These are used for many</tt> </tt>
<a name="L8"></a><tt class="py-lineno"> 8</tt> <tt class="py-line"><tt class="py-docstring">purposes including the important case where one member of some group </tt> </tt>
<a name="L9"></a><tt class="py-lineno"> 9</tt> <tt class="py-line"><tt class="py-docstring">of otherwise similar elements is special for whatever reason. Most </tt> </tt>
<a name="L10"></a><tt class="py-lineno"> 10</tt> <tt class="py-line"><tt class="py-docstring">often this results in conditional statements to distinguish between</tt> </tt>
<a name="L11"></a><tt class="py-lineno"> 11</tt> <tt class="py-line"><tt class="py-docstring">ordinary elements and the primitive Null value.</tt> </tt>
<a name="L12"></a><tt class="py-lineno"> 12</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L13"></a><tt class="py-lineno"> 13</tt> <tt class="py-line"><tt class="py-docstring">Among the advantages of using Null objects are the following:</tt> </tt>
<a name="L14"></a><tt class="py-lineno"> 14</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L15"></a><tt class="py-lineno"> 15</tt> <tt class="py-line"><tt class="py-docstring"> - Superfluous conditional statements can be avoided </tt> </tt>
<a name="L16"></a><tt class="py-lineno"> 16</tt> <tt class="py-line"><tt class="py-docstring"> by providing a first class object alternative for </tt> </tt>
<a name="L17"></a><tt class="py-lineno"> 17</tt> <tt class="py-line"><tt class="py-docstring"> the primitive value None.</tt> </tt>
<a name="L18"></a><tt class="py-lineno"> 18</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L19"></a><tt class="py-lineno"> 19</tt> <tt class="py-line"><tt class="py-docstring"> - Code readability is improved.</tt> </tt>
<a name="L20"></a><tt class="py-lineno"> 20</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L21"></a><tt class="py-lineno"> 21</tt> <tt class="py-line"><tt class="py-docstring"> - Null objects can act as a placeholder for objects </tt> </tt>
<a name="L22"></a><tt class="py-lineno"> 22</tt> <tt class="py-line"><tt class="py-docstring"> with behaviour that is not yet implemented.</tt> </tt>
<a name="L23"></a><tt class="py-lineno"> 23</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L24"></a><tt class="py-lineno"> 24</tt> <tt class="py-line"><tt class="py-docstring"> - Null objects can be replaced for any other class.</tt> </tt>
<a name="L25"></a><tt class="py-lineno"> 25</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L26"></a><tt class="py-lineno"> 26</tt> <tt class="py-line"><tt class="py-docstring"> - Null objects are very predictable at what they do.</tt> </tt>
<a name="L27"></a><tt class="py-lineno"> 27</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L28"></a><tt class="py-lineno"> 28</tt> <tt class="py-line"><tt class="py-docstring">To cope with the disadvantage of creating large numbers of passive </tt> </tt>
<a name="L29"></a><tt class="py-lineno"> 29</tt> <tt class="py-line"><tt class="py-docstring">objects that do nothing but occupy memory space Null objects are </tt> </tt>
<a name="L30"></a><tt class="py-lineno"> 30</tt> <tt class="py-line"><tt class="py-docstring">often combined with the Singleton pattern.</tt> </tt>
<a name="L31"></a><tt class="py-lineno"> 31</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L32"></a><tt class="py-lineno"> 32</tt> <tt class="py-line"><tt class="py-docstring">For more information use any internet search engine and look for </tt> </tt>
<a name="L33"></a><tt class="py-lineno"> 33</tt> <tt class="py-line"><tt class="py-docstring">combinations of these words: Null, object, design and pattern.</tt> </tt>
<a name="L34"></a><tt class="py-lineno"> 34</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L35"></a><tt class="py-lineno"> 35</tt> <tt class="py-line"><tt class="py-docstring">Dinu C. Gherman,</tt> </tt>
<a name="L36"></a><tt class="py-lineno"> 36</tt> <tt class="py-line"><tt class="py-docstring">August 2001</tt> </tt>
<a name="L37"></a><tt class="py-lineno"> 37</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L38"></a><tt class="py-lineno"> 38</tt> <tt class="py-line"><tt class="py-docstring">For modifications see CVS changelog below.</tt> </tt>
<a name="L39"></a><tt class="py-lineno"> 39</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L40"></a><tt class="py-lineno"> 40</tt> <tt class="py-line"><tt class="py-docstring">Karsten Hilbert</tt> </tt>
<a name="L41"></a><tt class="py-lineno"> 41</tt> <tt class="py-line"><tt class="py-docstring">July 2004</tt> </tt>
<a name="L42"></a><tt class="py-lineno"> 42</tt> <tt class="py-line"><tt class="py-docstring">"""</tt> </tt>
<a name="L43"></a><tt class="py-lineno"> 43</tt> <tt class="py-line"><tt class="py-comment">#==============================================================</tt> </tt>
<a name="L44"></a><tt class="py-lineno"> 44</tt> <tt class="py-line"><tt class="py-comment"># $Source: /home/ncq/Projekte/cvs2git/vcs-mirror/gnumed/gnumed/client/pycommon/gmNull.py,v $</tt> </tt>
<a name="L45"></a><tt class="py-lineno"> 45</tt> <tt class="py-line"><tt id="link-0" class="py-name" targets="Variable Gnumed.pycommon.gmGuiBroker.__version__=Gnumed.pycommon.gmGuiBroker-module.html#__version__"><a title="Gnumed.pycommon.gmGuiBroker.__version__" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-0', '__version__', 'link-0');">__version__</a></tt> <tt class="py-op">=</tt> <tt class="py-string">"$Revision: 1.6 $"</tt> </tt>
<a name="L46"></a><tt class="py-lineno"> 46</tt> <tt class="py-line"><tt id="link-1" class="py-name" targets="Variable Gnumed.pycommon.gmGuiBroker.__author__=Gnumed.pycommon.gmGuiBroker-module.html#__author__"><a title="Gnumed.pycommon.gmGuiBroker.__author__" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-1', '__author__', 'link-1');">__author__</a></tt> <tt class="py-op">=</tt> <tt class="py-string">"Dinu C. Gherman"</tt> </tt>
<a name="L47"></a><tt class="py-lineno"> 47</tt> <tt class="py-line"><tt class="py-name">__license__</tt> <tt class="py-op">=</tt> <tt class="py-string">"GPL v2 or later (details at http://www.gnu.org)"</tt> </tt>
<a name="L48"></a><tt class="py-lineno"> 48</tt> <tt class="py-line"> </tt>
<a name="L49"></a><tt class="py-lineno"> 49</tt> <tt class="py-line"><tt class="py-comment">#==============================================================</tt> </tt>
<a name="cNull"></a><div id="cNull-def"><a name="L50"></a><tt class="py-lineno"> 50</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="cNull-toggle" onclick="return toggle('cNull');">-</a><tt class="py-line"><tt class="py-keyword">class</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull.cNull-class.html">cNull</a><tt class="py-op">:</tt> </tt>
</div><div id="cNull-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="cNull-expanded"><a name="L51"></a><tt class="py-lineno"> 51</tt> <tt class="py-line"> <tt class="py-docstring">"""A class for implementing Null objects.</tt> </tt>
<a name="L52"></a><tt class="py-lineno"> 52</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L53"></a><tt class="py-lineno"> 53</tt> <tt class="py-line"><tt class="py-docstring"> This class ignores all parameters passed when constructing or </tt> </tt>
<a name="L54"></a><tt class="py-lineno"> 54</tt> <tt class="py-line"><tt class="py-docstring"> calling instances and traps all attribute and method requests. </tt> </tt>
<a name="L55"></a><tt class="py-lineno"> 55</tt> <tt class="py-line"><tt class="py-docstring"> Instances of it always (and reliably) do 'nothing'.</tt> </tt>
<a name="L56"></a><tt class="py-lineno"> 56</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
<a name="L57"></a><tt class="py-lineno"> 57</tt> <tt class="py-line"><tt class="py-docstring"> The code might benefit from implementing some further special </tt> </tt>
<a name="L58"></a><tt class="py-lineno"> 58</tt> <tt class="py-line"><tt class="py-docstring"> Python methods depending on the context in which its instances </tt> </tt>
<a name="L59"></a><tt class="py-lineno"> 59</tt> <tt class="py-line"><tt class="py-docstring"> are used. Especially when comparing and coercing Null objects</tt> </tt>
<a name="L60"></a><tt class="py-lineno"> 60</tt> <tt class="py-line"><tt class="py-docstring"> the respective methods' implementation will depend very much</tt> </tt>
<a name="L61"></a><tt class="py-lineno"> 61</tt> <tt class="py-line"><tt class="py-docstring"> on the environment and, hence, these special methods are not</tt> </tt>
<a name="L62"></a><tt class="py-lineno"> 62</tt> <tt class="py-line"><tt class="py-docstring"> provided here.</tt> </tt>
<a name="L63"></a><tt class="py-lineno"> 63</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
<a name="L64"></a><tt class="py-lineno"> 64</tt> <tt class="py-line"> <tt id="link-2" class="py-name" targets="Variable Gnumed.pycommon.gmNull.cNull._warn=Gnumed.pycommon.gmNull.cNull-class.html#_warn"><a title="Gnumed.pycommon.gmNull.cNull._warn" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-2', '_warn', 'link-2');">_warn</a></tt> <tt class="py-op">=</tt> <tt class="py-number">0</tt> </tt>
<a name="L65"></a><tt class="py-lineno"> 65</tt> <tt class="py-line"> </tt>
<a name="L66"></a><tt class="py-lineno"> 66</tt> <tt class="py-line"> <tt class="py-comment"># object constructing</tt> </tt>
<a name="L67"></a><tt class="py-lineno"> 67</tt> <tt class="py-line"> </tt>
<a name="cNull.__init__"></a><div id="cNull.__init__-def"><a name="L68"></a><tt class="py-lineno"> 68</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="cNull.__init__-toggle" onclick="return toggle('cNull.__init__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull.cNull-class.html#__init__">__init__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">,</tt> <tt class="py-op">*</tt><tt class="py-param">args</tt><tt class="py-op">,</tt> <tt class="py-op">**</tt><tt class="py-param">kwargs</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="cNull.__init__-collapsed" style="display:none;" pad="+++" indent="++++++++++++"></div><div id="cNull.__init__-expanded"><a name="L69"></a><tt class="py-lineno"> 69</tt> <tt class="py-line"> <tt class="py-docstring">"Ignore parameters."</tt> </tt>
<a name="L70"></a><tt class="py-lineno"> 70</tt> <tt class="py-line"> <tt class="py-keyword">try</tt><tt class="py-op">:</tt> </tt>
<a name="L71"></a><tt class="py-lineno"> 71</tt> <tt class="py-line"> <tt id="link-3" class="py-name" targets="Class Gnumed.pycommon.gmNull.cNull=Gnumed.pycommon.gmNull.cNull-class.html"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-3', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">.</tt><tt id="link-4" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull._warn" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-4', '_warn', 'link-2');">_warn</a></tt> <tt class="py-op">=</tt> <tt class="py-name">kwargs</tt><tt class="py-op">[</tt><tt class="py-string">'warn'</tt><tt class="py-op">]</tt> </tt>
<a name="L72"></a><tt class="py-lineno"> 72</tt> <tt class="py-line"> <tt class="py-keyword">except</tt> <tt class="py-name">KeyError</tt><tt class="py-op">:</tt> </tt>
<a name="L73"></a><tt class="py-lineno"> 73</tt> <tt class="py-line"> <tt class="py-keyword">pass</tt> </tt>
<a name="L74"></a><tt class="py-lineno"> 74</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-name">None</tt> </tt>
</div><a name="L75"></a><tt class="py-lineno"> 75</tt> <tt class="py-line"> </tt>
<a name="L76"></a><tt class="py-lineno"> 76</tt> <tt class="py-line"> <tt class="py-comment"># object calling</tt> </tt>
<a name="L77"></a><tt class="py-lineno"> 77</tt> <tt class="py-line"> </tt>
<a name="cNull.__call__"></a><div id="cNull.__call__-def"><a name="L78"></a><tt class="py-lineno"> 78</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="cNull.__call__-toggle" onclick="return toggle('cNull.__call__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull.cNull-class.html#__call__">__call__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">,</tt> <tt class="py-op">*</tt><tt class="py-param">args</tt><tt class="py-op">,</tt> <tt class="py-op">**</tt><tt class="py-param">kwargs</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="cNull.__call__-collapsed" style="display:none;" pad="+++" indent="++++++++++++"></div><div id="cNull.__call__-expanded"><a name="L79"></a><tt class="py-lineno"> 79</tt> <tt class="py-line"> <tt class="py-docstring">"Ignore method calls."</tt> </tt>
<a name="L80"></a><tt class="py-lineno"> 80</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt id="link-5" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-5', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">.</tt><tt id="link-6" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull._warn" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-6', '_warn', 'link-2');">_warn</a></tt><tt class="py-op">:</tt> </tt>
<a name="L81"></a><tt class="py-lineno"> 81</tt> <tt class="py-line"> <tt class="py-keyword">print</tt> <tt class="py-string">"cNull.__call__()"</tt> </tt>
<a name="L82"></a><tt class="py-lineno"> 82</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-name">self</tt> </tt>
</div><a name="L83"></a><tt class="py-lineno"> 83</tt> <tt class="py-line"> </tt>
<a name="L84"></a><tt class="py-lineno"> 84</tt> <tt class="py-line"> <tt class="py-comment"># attribute handling</tt> </tt>
<a name="L85"></a><tt class="py-lineno"> 85</tt> <tt class="py-line"> </tt>
<a name="cNull.__getattr__"></a><div id="cNull.__getattr__-def"><a name="L86"></a><tt class="py-lineno"> 86</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="cNull.__getattr__-toggle" onclick="return toggle('cNull.__getattr__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull.cNull-class.html#__getattr__">__getattr__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">,</tt> <tt class="py-param">mname</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="cNull.__getattr__-collapsed" style="display:none;" pad="+++" indent="++++++++++++"></div><div id="cNull.__getattr__-expanded"><a name="L87"></a><tt class="py-lineno"> 87</tt> <tt class="py-line"> <tt class="py-docstring">"Ignore attribute requests."</tt> </tt>
<a name="L88"></a><tt class="py-lineno"> 88</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt id="link-7" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-7', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">.</tt><tt id="link-8" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull._warn" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-8', '_warn', 'link-2');">_warn</a></tt><tt class="py-op">:</tt> </tt>
<a name="L89"></a><tt class="py-lineno"> 89</tt> <tt class="py-line"> <tt class="py-keyword">print</tt> <tt class="py-string">"cNull.__getattr__()"</tt> </tt>
<a name="L90"></a><tt class="py-lineno"> 90</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-name">self</tt> </tt>
</div><a name="L91"></a><tt class="py-lineno"> 91</tt> <tt class="py-line"> </tt>
<a name="cNull.__setattr__"></a><div id="cNull.__setattr__-def"><a name="L92"></a><tt class="py-lineno"> 92</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="cNull.__setattr__-toggle" onclick="return toggle('cNull.__setattr__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull.cNull-class.html#__setattr__">__setattr__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">,</tt> <tt class="py-param">name</tt><tt class="py-op">,</tt> <tt class="py-param">value</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="cNull.__setattr__-collapsed" style="display:none;" pad="+++" indent="++++++++++++"></div><div id="cNull.__setattr__-expanded"><a name="L93"></a><tt class="py-lineno"> 93</tt> <tt class="py-line"> <tt class="py-docstring">"Ignore attribute setting."</tt> </tt>
<a name="L94"></a><tt class="py-lineno"> 94</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt id="link-9" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-9', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">.</tt><tt id="link-10" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull._warn" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-10', '_warn', 'link-2');">_warn</a></tt><tt class="py-op">:</tt> </tt>
<a name="L95"></a><tt class="py-lineno"> 95</tt> <tt class="py-line"> <tt class="py-keyword">print</tt> <tt class="py-string">"cNull.__setattr__()"</tt> </tt>
<a name="L96"></a><tt class="py-lineno"> 96</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-name">self</tt> </tt>
</div><a name="L97"></a><tt class="py-lineno"> 97</tt> <tt class="py-line"> </tt>
<a name="cNull.__delattr__"></a><div id="cNull.__delattr__-def"><a name="L98"></a><tt class="py-lineno"> 98</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="cNull.__delattr__-toggle" onclick="return toggle('cNull.__delattr__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull.cNull-class.html#__delattr__">__delattr__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">,</tt> <tt class="py-param">name</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="cNull.__delattr__-collapsed" style="display:none;" pad="+++" indent="++++++++++++"></div><div id="cNull.__delattr__-expanded"><a name="L99"></a><tt class="py-lineno"> 99</tt> <tt class="py-line"> <tt class="py-docstring">"Ignore deleting attributes."</tt> </tt>
<a name="L100"></a><tt class="py-lineno">100</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt id="link-11" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-11', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">.</tt><tt id="link-12" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull._warn" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-12', '_warn', 'link-2');">_warn</a></tt><tt class="py-op">:</tt> </tt>
<a name="L101"></a><tt class="py-lineno">101</tt> <tt class="py-line"> <tt class="py-keyword">print</tt> <tt class="py-string">"cNull.__delattr__()"</tt> </tt>
<a name="L102"></a><tt class="py-lineno">102</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-name">self</tt> </tt>
</div><a name="L103"></a><tt class="py-lineno">103</tt> <tt class="py-line"> </tt>
<a name="L104"></a><tt class="py-lineno">104</tt> <tt class="py-line"> <tt class="py-comment"># misc.</tt> </tt>
<a name="L105"></a><tt class="py-lineno">105</tt> <tt class="py-line"> </tt>
<a name="cNull.__repr__"></a><div id="cNull.__repr__-def"><a name="L106"></a><tt class="py-lineno">106</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="cNull.__repr__-toggle" onclick="return toggle('cNull.__repr__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull.cNull-class.html#__repr__">__repr__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="cNull.__repr__-collapsed" style="display:none;" pad="+++" indent="++++++++++++"></div><div id="cNull.__repr__-expanded"><a name="L107"></a><tt class="py-lineno">107</tt> <tt class="py-line"> <tt class="py-docstring">"Return a string representation."</tt> </tt>
<a name="L108"></a><tt class="py-lineno">108</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt id="link-13" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-13', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">.</tt><tt id="link-14" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull._warn" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-14', '_warn', 'link-2');">_warn</a></tt><tt class="py-op">:</tt> </tt>
<a name="L109"></a><tt class="py-lineno">109</tt> <tt class="py-line"> <tt class="py-keyword">print</tt> <tt class="py-string">"cNull.__repr__()"</tt> </tt>
<a name="L110"></a><tt class="py-lineno">110</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-string">"<cNull instance @ %s>"</tt> <tt class="py-op">%</tt> <tt class="py-name">id</tt><tt class="py-op">(</tt><tt class="py-name">self</tt><tt class="py-op">)</tt> </tt>
</div><a name="L111"></a><tt class="py-lineno">111</tt> <tt class="py-line"> </tt>
<a name="cNull.__str__"></a><div id="cNull.__str__-def"><a name="L112"></a><tt class="py-lineno">112</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="cNull.__str__-toggle" onclick="return toggle('cNull.__str__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull.cNull-class.html#__str__">__str__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="cNull.__str__-collapsed" style="display:none;" pad="+++" indent="++++++++++++"></div><div id="cNull.__str__-expanded"><a name="L113"></a><tt class="py-lineno">113</tt> <tt class="py-line"> <tt class="py-docstring">"Convert to a string and return it."</tt> </tt>
<a name="L114"></a><tt class="py-lineno">114</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt id="link-15" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-15', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">.</tt><tt id="link-16" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull._warn" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-16', '_warn', 'link-2');">_warn</a></tt><tt class="py-op">:</tt> </tt>
<a name="L115"></a><tt class="py-lineno">115</tt> <tt class="py-line"> <tt class="py-keyword">print</tt> <tt class="py-string">"cNull.__str__()"</tt> </tt>
<a name="L116"></a><tt class="py-lineno">116</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-string">"cNull instance"</tt> </tt>
</div><a name="L117"></a><tt class="py-lineno">117</tt> <tt class="py-line"> </tt>
<a name="cNull.__nonzero__"></a><div id="cNull.__nonzero__-def"><a name="L118"></a><tt class="py-lineno">118</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="cNull.__nonzero__-toggle" onclick="return toggle('cNull.__nonzero__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull.cNull-class.html#__nonzero__">__nonzero__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="cNull.__nonzero__-collapsed" style="display:none;" pad="+++" indent="++++++++++++"></div><div id="cNull.__nonzero__-expanded"><a name="L119"></a><tt class="py-lineno">119</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt id="link-17" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-17', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">.</tt><tt id="link-18" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull._warn" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-18', '_warn', 'link-2');">_warn</a></tt><tt class="py-op">:</tt> </tt>
<a name="L120"></a><tt class="py-lineno">120</tt> <tt class="py-line"> <tt class="py-keyword">print</tt> <tt class="py-string">"cNull.__nonzero__()"</tt> </tt>
<a name="L121"></a><tt class="py-lineno">121</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-number">0</tt> </tt>
</div><a name="L122"></a><tt class="py-lineno">122</tt> <tt class="py-line"> </tt>
<a name="cNull.__len__"></a><div id="cNull.__len__-def"><a name="L123"></a><tt class="py-lineno">123</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="cNull.__len__-toggle" onclick="return toggle('cNull.__len__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull.cNull-class.html#__len__">__len__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="cNull.__len__-collapsed" style="display:none;" pad="+++" indent="++++++++++++"></div><div id="cNull.__len__-expanded"><a name="L124"></a><tt class="py-lineno">124</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt id="link-19" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-19', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">.</tt><tt id="link-20" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull._warn" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-20', '_warn', 'link-2');">_warn</a></tt><tt class="py-op">:</tt> </tt>
<a name="L125"></a><tt class="py-lineno">125</tt> <tt class="py-line"> <tt class="py-keyword">print</tt> <tt class="py-string">"cNull.__len__()"</tt> </tt>
<a name="L126"></a><tt class="py-lineno">126</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-number">0</tt> </tt>
</div></div><a name="L127"></a><tt class="py-lineno">127</tt> <tt class="py-line"> </tt>
<a name="L128"></a><tt class="py-lineno">128</tt> <tt class="py-line"><tt class="py-comment">#==============================================================</tt> </tt>
<a name="test"></a><div id="test-def"><a name="L129"></a><tt class="py-lineno">129</tt> <a class="py-toggle" href="Gnumed.pycommon.gmNull-pysrc.html#" id="test-toggle" onclick="return toggle('test');">-</a><tt class="py-line"><tt class="py-keyword">def</tt> <a class="py-def-name" href="Gnumed.pycommon.gmNull-module.html#test">test</a><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
</div><div id="test-collapsed" style="display:none;" pad="+++" indent="++++"></div><div id="test-expanded"><a name="L130"></a><tt class="py-lineno">130</tt> <tt class="py-line"> <tt class="py-docstring">"Perform some decent tests, or rather: demos."</tt> </tt>
<a name="L131"></a><tt class="py-lineno">131</tt> <tt class="py-line"> </tt>
<a name="L132"></a><tt class="py-lineno">132</tt> <tt class="py-line"> <tt class="py-comment"># constructing and calling</tt> </tt>
<a name="L133"></a><tt class="py-lineno">133</tt> <tt class="py-line"> </tt>
<a name="L134"></a><tt class="py-lineno">134</tt> <tt class="py-line"> <tt class="py-name">n</tt> <tt class="py-op">=</tt> <tt id="link-21" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-21', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L135"></a><tt class="py-lineno">135</tt> <tt class="py-line"> <tt class="py-name">n</tt> <tt class="py-op">=</tt> <tt id="link-22" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-22', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">(</tt><tt class="py-string">'value'</tt><tt class="py-op">)</tt> </tt>
<a name="L136"></a><tt class="py-lineno">136</tt> <tt class="py-line"> <tt class="py-name">n</tt> <tt class="py-op">=</tt> <tt id="link-23" class="py-name"><a title="Gnumed.pycommon.gmNull.cNull" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-23', 'cNull', 'link-3');">cNull</a></tt><tt class="py-op">(</tt><tt class="py-string">'value'</tt><tt class="py-op">,</tt> <tt class="py-name">param</tt><tt class="py-op">=</tt><tt class="py-string">'value'</tt><tt class="py-op">,</tt> <tt class="py-name">warn</tt><tt class="py-op">=</tt><tt class="py-number">1</tt><tt class="py-op">)</tt> </tt>
<a name="L137"></a><tt class="py-lineno">137</tt> <tt class="py-line"> </tt>
<a name="L138"></a><tt class="py-lineno">138</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L139"></a><tt class="py-lineno">139</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">(</tt><tt class="py-string">'value'</tt><tt class="py-op">)</tt> </tt>
<a name="L140"></a><tt class="py-lineno">140</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">(</tt><tt class="py-string">'value'</tt><tt class="py-op">,</tt> <tt class="py-name">param</tt><tt class="py-op">=</tt><tt class="py-string">'value'</tt><tt class="py-op">)</tt> </tt>
<a name="L141"></a><tt class="py-lineno">141</tt> <tt class="py-line"> </tt>
<a name="L142"></a><tt class="py-lineno">142</tt> <tt class="py-line"> <tt class="py-comment"># attribute handling</tt> </tt>
<a name="L143"></a><tt class="py-lineno">143</tt> <tt class="py-line"> </tt>
<a name="L144"></a><tt class="py-lineno">144</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">attr1</tt> </tt>
<a name="L145"></a><tt class="py-lineno">145</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">attr1</tt><tt class="py-op">.</tt><tt class="py-name">attr2</tt> </tt>
<a name="L146"></a><tt class="py-lineno">146</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">method1</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L147"></a><tt class="py-lineno">147</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">method1</tt><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">.</tt><tt class="py-name">method2</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L148"></a><tt class="py-lineno">148</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">method</tt><tt class="py-op">(</tt><tt class="py-string">'value'</tt><tt class="py-op">)</tt> </tt>
<a name="L149"></a><tt class="py-lineno">149</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">method</tt><tt class="py-op">(</tt><tt class="py-name">param</tt><tt class="py-op">=</tt><tt class="py-string">'value'</tt><tt class="py-op">)</tt> </tt>
<a name="L150"></a><tt class="py-lineno">150</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">method</tt><tt class="py-op">(</tt><tt class="py-string">'value'</tt><tt class="py-op">,</tt> <tt class="py-name">param</tt><tt class="py-op">=</tt><tt class="py-string">'value'</tt><tt class="py-op">)</tt> </tt>
<a name="L151"></a><tt class="py-lineno">151</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">attr1</tt><tt class="py-op">.</tt><tt class="py-name">method1</tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L152"></a><tt class="py-lineno">152</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">method1</tt><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">.</tt><tt class="py-name">attr1</tt> </tt>
<a name="L153"></a><tt class="py-lineno">153</tt> <tt class="py-line"> </tt>
<a name="L154"></a><tt class="py-lineno">154</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">attr1</tt> <tt class="py-op">=</tt> <tt class="py-string">'value'</tt> </tt>
<a name="L155"></a><tt class="py-lineno">155</tt> <tt class="py-line"> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">attr1</tt><tt class="py-op">.</tt><tt class="py-name">attr2</tt> <tt class="py-op">=</tt> <tt class="py-string">'value'</tt> </tt>
<a name="L156"></a><tt class="py-lineno">156</tt> <tt class="py-line"> </tt>
<a name="L157"></a><tt class="py-lineno">157</tt> <tt class="py-line"> <tt class="py-keyword">del</tt> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">attr1</tt> </tt>
<a name="L158"></a><tt class="py-lineno">158</tt> <tt class="py-line"> <tt class="py-keyword">del</tt> <tt class="py-name">n</tt><tt class="py-op">.</tt><tt class="py-name">attr1</tt><tt class="py-op">.</tt><tt class="py-name">attr2</tt><tt class="py-op">.</tt><tt class="py-name">attr3</tt> </tt>
<a name="L159"></a><tt class="py-lineno">159</tt> <tt class="py-line"> </tt>
<a name="L160"></a><tt class="py-lineno">160</tt> <tt class="py-line"> <tt class="py-comment"># representation and conversion to a string</tt> </tt>
<a name="L161"></a><tt class="py-lineno">161</tt> <tt class="py-line"> <tt class="py-name">tmp</tt> <tt class="py-op">=</tt> <tt class="py-string">'<cNull instance @ %s>'</tt> <tt class="py-op">%</tt> <tt class="py-name">id</tt><tt class="py-op">(</tt><tt class="py-name">n</tt><tt class="py-op">)</tt> </tt>
<a name="L162"></a><tt class="py-lineno">162</tt> <tt class="py-line"> <tt class="py-keyword">assert</tt> <tt class="py-name">repr</tt><tt class="py-op">(</tt><tt class="py-name">n</tt><tt class="py-op">)</tt> <tt class="py-op">==</tt> <tt class="py-name">tmp</tt> </tt>
<a name="L163"></a><tt class="py-lineno">163</tt> <tt class="py-line"> <tt class="py-keyword">assert</tt> <tt class="py-name">str</tt><tt class="py-op">(</tt><tt class="py-name">n</tt><tt class="py-op">)</tt> <tt class="py-op">==</tt> <tt class="py-string">'cNull instance'</tt> </tt>
<a name="L164"></a><tt class="py-lineno">164</tt> <tt class="py-line"> </tt>
<a name="L165"></a><tt class="py-lineno">165</tt> <tt class="py-line"> <tt class="py-comment"># comparing</tt> </tt>
<a name="L166"></a><tt class="py-lineno">166</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt class="py-name">n</tt> <tt class="py-op">==</tt> <tt class="py-number">1</tt><tt class="py-op">:</tt> </tt>
<a name="L167"></a><tt class="py-lineno">167</tt> <tt class="py-line"> <tt class="py-keyword">print</tt> <tt class="py-string">"Null object == 1"</tt> </tt>
<a name="L168"></a><tt class="py-lineno">168</tt> <tt class="py-line"> <tt class="py-keyword">else</tt><tt class="py-op">:</tt> </tt>
<a name="L169"></a><tt class="py-lineno">169</tt> <tt class="py-line"> <tt class="py-keyword">print</tt> <tt class="py-string">"Null object != 1"</tt> </tt>
</div><a name="L170"></a><tt class="py-lineno">170</tt> <tt class="py-line"><tt class="py-comment">#--------------------------------------------------------------</tt> </tt>
<a name="L171"></a><tt class="py-lineno">171</tt> <tt class="py-line"><tt class="py-keyword">if</tt> <tt class="py-name">__name__</tt> <tt class="py-op">==</tt> <tt class="py-string">'__main__'</tt><tt class="py-op">:</tt> </tt>
<a name="L172"></a><tt class="py-lineno">172</tt> <tt class="py-line"> <tt id="link-24" class="py-name" targets="Method Gnumed.pycommon.gmMimeMagic.magicTest.test()=Gnumed.pycommon.gmMimeMagic.magicTest-class.html#test,Function Gnumed.pycommon.gmNull.test()=Gnumed.pycommon.gmNull-module.html#test"><a title="Gnumed.pycommon.gmMimeMagic.magicTest.test
Gnumed.pycommon.gmNull.test" class="py-name" href="Gnumed.pycommon.gmNull-pysrc.html#" onclick="return doclink('link-24', 'test', 'link-24');">test</a></tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
<a name="L173"></a><tt class="py-lineno">173</tt> <tt class="py-line"> </tt>
<a name="L174"></a><tt class="py-lineno">174</tt> <tt class="py-line"><tt class="py-comment">#==============================================================</tt> </tt>
<a name="L175"></a><tt class="py-lineno">175</tt> <tt class="py-line"><tt class="py-comment"># $Log: gmNull.py,v $</tt> </tt>
<a name="L176"></a><tt class="py-lineno">176</tt> <tt class="py-line"><tt class="py-comment"># Revision 1.6 2005-06-28 14:12:55 cfmoro</tt> </tt>
<a name="L177"></a><tt class="py-lineno">177</tt> <tt class="py-line"><tt class="py-comment"># Integration in space fixes</tt> </tt>
<a name="L178"></a><tt class="py-lineno">178</tt> <tt class="py-line"><tt class="py-comment">#</tt> </tt>
<a name="L179"></a><tt class="py-lineno">179</tt> <tt class="py-line"><tt class="py-comment"># Revision 1.5 2004/12/22 08:40:01 ncq</tt> </tt>
<a name="L180"></a><tt class="py-lineno">180</tt> <tt class="py-line"><tt class="py-comment"># - make output more obvious</tt> </tt>
<a name="L181"></a><tt class="py-lineno">181</tt> <tt class="py-line"><tt class="py-comment">#</tt> </tt>
<a name="L182"></a><tt class="py-lineno">182</tt> <tt class="py-line"><tt class="py-comment"># Revision 1.4 2004/11/24 15:49:11 ncq</tt> </tt>
<a name="L183"></a><tt class="py-lineno">183</tt> <tt class="py-line"><tt class="py-comment"># - use 0/1 not False/True so we can run on older pythons</tt> </tt>
<a name="L184"></a><tt class="py-lineno">184</tt> <tt class="py-line"><tt class="py-comment">#</tt> </tt>
<a name="L185"></a><tt class="py-lineno">185</tt> <tt class="py-line"><tt class="py-comment"># Revision 1.3 2004/08/20 08:38:47 ncq</tt> </tt>
<a name="L186"></a><tt class="py-lineno">186</tt> <tt class="py-line"><tt class="py-comment"># - robustify while working on allowing inactive patient after search</tt> </tt>
<a name="L187"></a><tt class="py-lineno">187</tt> <tt class="py-line"><tt class="py-comment">#</tt> </tt>
<a name="L188"></a><tt class="py-lineno">188</tt> <tt class="py-line"><tt class="py-comment"># Revision 1.2 2004/07/21 07:51:47 ncq</tt> </tt>
<a name="L189"></a><tt class="py-lineno">189</tt> <tt class="py-line"><tt class="py-comment"># - tabified</tt> </tt>
<a name="L190"></a><tt class="py-lineno">190</tt> <tt class="py-line"><tt class="py-comment"># - __nonzero__ added</tt> </tt>
<a name="L191"></a><tt class="py-lineno">191</tt> <tt class="py-line"><tt class="py-comment"># - if keyword argument 'warn' is True: warn on use of Null class</tt> </tt>
<a name="L192"></a><tt class="py-lineno">192</tt> <tt class="py-line"><tt class="py-comment">#</tt> </tt>
<a name="L193"></a><tt class="py-lineno">193</tt> <tt class="py-line"><tt class="py-comment"># Revision 1.1 2004/07/06 00:08:31 ncq</tt> </tt>
<a name="L194"></a><tt class="py-lineno">194</tt> <tt class="py-line"><tt class="py-comment"># - null design pattern from python cookbook</tt> </tt>
<a name="L195"></a><tt class="py-lineno">195</tt> <tt class="py-line"><tt class="py-comment">#</tt> </tt>
<a name="L196"></a><tt class="py-lineno">196</tt> <tt class="py-line"> </tt><script type="text/javascript">
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