204 lines
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204 lines
24 KiB
HTML
Vendored
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<a href="pypat-module.html">Package pypat</a> ::
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<a href="pypat.behavioral-module.html">Package behavioral</a> ::
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Module command
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<h1 class="epydoc">Source Code for <a href="pypat.behavioral.command-module.html">Module pypat.behavioral.command</a></h1>
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<pre class="py-src">
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<a name="L1"></a><tt class="py-lineno"> 1</tt> <tt class="py-line"><tt class="py-keyword">from</tt> <tt class="py-name">abc</tt> <tt class="py-keyword">import</tt> <tt class="py-name">ABCMeta</tt><tt class="py-op">,</tt> <tt class="py-name">abstractmethod</tt> </tt>
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<a name="Receiver"></a><div id="Receiver-def"><a name="L2"></a><tt class="py-lineno"> 2</tt> <tt class="py-line"> </tt>
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<a name="L3"></a><tt class="py-lineno"> 3</tt> <tt class="py-line"> </tt>
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<a name="L4"></a><tt class="py-lineno"> 4</tt> <a class="py-toggle" href="#" id="Receiver-toggle" onclick="return toggle('Receiver');">-</a><tt class="py-line"><tt class="py-keyword">class</tt> <a class="py-def-name" href="pypat.behavioral.command.Receiver-class.html">Receiver</a><tt class="py-op">(</tt><tt class="py-base-class">object</tt><tt class="py-op">,</tt> <tt class="py-base-class">metaclass</tt><tt class="py-op">=</tt><tt class="py-base-class">ABCMeta</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Receiver-collapsed" style="display:none;" pad="++" indent="++++"></div><div id="Receiver-expanded"><a name="L5"></a><tt class="py-lineno"> 5</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L6"></a><tt class="py-lineno"> 6</tt> <tt class="py-line"><tt class="py-docstring"> Abstract receiver class as part of the Command pattern.</tt> </tt>
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<a name="L7"></a><tt class="py-lineno"> 7</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
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<a name="L8"></a><tt class="py-lineno"> 8</tt> <tt class="py-line"><tt class="py-docstring"> - External Usage documentation: U{https://github.com/tylerlaberge/PyPatterns/wiki/Behavioral-Pattern-Usage}</tt> </tt>
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<a name="L9"></a><tt class="py-lineno"> 9</tt> <tt class="py-line"><tt class="py-docstring"> - External Command Pattern documentation: U{https://en.wikipedia.org/wiki/Command_pattern}</tt> </tt>
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<a name="L10"></a><tt class="py-lineno">10</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="Receiver.action"></a><div id="Receiver.action-def"><a name="L11"></a><tt class="py-lineno">11</tt> <a class="py-toggle" href="#" id="Receiver.action-toggle" onclick="return toggle('Receiver.action');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="pypat.behavioral.command.Receiver-class.html#action">action</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 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>
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</div><div id="Receiver.action-collapsed" style="display:none;" pad="++" indent="++++++++"></div><div id="Receiver.action-expanded"><a name="L12"></a><tt class="py-lineno">12</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L13"></a><tt class="py-lineno">13</tt> <tt class="py-line"><tt class="py-docstring"> Delegates which method to be called for a desired action.</tt> </tt>
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<a name="L14"></a><tt class="py-lineno">14</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
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<a name="L15"></a><tt class="py-lineno">15</tt> <tt class="py-line"><tt class="py-docstring"> @param name: The name of the action to execute.</tt> </tt>
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<a name="L16"></a><tt class="py-lineno">16</tt> <tt class="py-line"><tt class="py-docstring"> @type name: str</tt> </tt>
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<a name="L17"></a><tt class="py-lineno">17</tt> <tt class="py-line"><tt class="py-docstring"> @param args: Any arguments for the action.</tt> </tt>
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<a name="L18"></a><tt class="py-lineno">18</tt> <tt class="py-line"><tt class="py-docstring"> @param kwargs: Any keyword arguments for the action.</tt> </tt>
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<a name="L19"></a><tt class="py-lineno">19</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="L20"></a><tt class="py-lineno">20</tt> <tt class="py-line"> <tt class="py-keyword">try</tt><tt class="py-op">:</tt> </tt>
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<a name="L21"></a><tt class="py-lineno">21</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt class="py-name">getattr</tt><tt class="py-op">(</tt><tt class="py-name">self</tt><tt class="py-op">,</tt> <tt class="py-name">name</tt><tt class="py-op">)</tt><tt class="py-op">(</tt><tt class="py-op">*</tt><tt class="py-name">args</tt><tt class="py-op">,</tt> <tt class="py-op">**</tt><tt class="py-name">kwargs</tt><tt class="py-op">)</tt> </tt>
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<a name="L22"></a><tt class="py-lineno">22</tt> <tt class="py-line"> <tt class="py-keyword">except</tt> <tt class="py-name">AttributeError</tt><tt class="py-op">:</tt> </tt>
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<a name="L23"></a><tt class="py-lineno">23</tt> <tt class="py-line"> <tt class="py-keyword">raise</tt> <tt class="py-name">AttributeError</tt><tt class="py-op">(</tt><tt class="py-string">'Invalid Action.'</tt><tt class="py-op">)</tt> </tt>
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</div></div><a name="L24"></a><tt class="py-lineno">24</tt> <tt class="py-line"> </tt>
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<a name="Command"></a><div id="Command-def"><a name="L25"></a><tt class="py-lineno">25</tt> <tt class="py-line"> </tt>
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<a name="L26"></a><tt class="py-lineno">26</tt> <a class="py-toggle" href="#" id="Command-toggle" onclick="return toggle('Command');">-</a><tt class="py-line"><tt class="py-keyword">class</tt> <a class="py-def-name" href="pypat.behavioral.command.Command-class.html">Command</a><tt class="py-op">(</tt><tt class="py-base-class">object</tt><tt class="py-op">,</tt> <tt class="py-base-class">metaclass</tt><tt class="py-op">=</tt><tt class="py-base-class">ABCMeta</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Command-collapsed" style="display:none;" pad="++" indent="++++"></div><div id="Command-expanded"><a name="L27"></a><tt class="py-lineno">27</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L28"></a><tt class="py-lineno">28</tt> <tt class="py-line"><tt class="py-docstring"> Abstract Command class as part of the Command pattern.</tt> </tt>
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<a name="L29"></a><tt class="py-lineno">29</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
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<a name="L30"></a><tt class="py-lineno">30</tt> <tt class="py-line"><tt class="py-docstring"> - External Usage documentation: U{https://github.com/tylerlaberge/PyPatterns/wiki/Behavioral-Pattern-Usage}</tt> </tt>
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<a name="L31"></a><tt class="py-lineno">31</tt> <tt class="py-line"><tt class="py-docstring"> - External Command Pattern documentation: U{https://en.wikipedia.org/wiki/Command_pattern}</tt> </tt>
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<a name="L32"></a><tt class="py-lineno">32</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="Command.__init__"></a><div id="Command.__init__-def"><a name="L33"></a><tt class="py-lineno">33</tt> <a class="py-toggle" href="#" id="Command.__init__-toggle" onclick="return toggle('Command.__init__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="pypat.behavioral.command.Command-class.html#__init__">__init__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">,</tt> <tt class="py-param">receiver</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Command.__init__-collapsed" style="display:none;" pad="++" indent="++++++++"></div><div id="Command.__init__-expanded"><a name="L34"></a><tt class="py-lineno">34</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L35"></a><tt class="py-lineno">35</tt> <tt class="py-line"><tt class="py-docstring"> Initialize a new command instance.</tt> </tt>
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<a name="L36"></a><tt class="py-lineno">36</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
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<a name="L37"></a><tt class="py-lineno">37</tt> <tt class="py-line"><tt class="py-docstring"> @param receiver: The receiver for this command to use.</tt> </tt>
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<a name="L38"></a><tt class="py-lineno">38</tt> <tt class="py-line"><tt class="py-docstring"> @type receiver: Receiver</tt> </tt>
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<a name="L39"></a><tt class="py-lineno">39</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="L40"></a><tt class="py-lineno">40</tt> <tt class="py-line"> <tt class="py-name">self</tt><tt class="py-op">.</tt><tt class="py-name">_receiver</tt> <tt class="py-op">=</tt> <tt class="py-name">receiver</tt> </tt>
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</div><a name="L41"></a><tt class="py-lineno">41</tt> <tt class="py-line"> </tt>
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<a name="L42"></a><tt class="py-lineno">42</tt> <tt class="py-line"> <tt class="py-decorator">@</tt><tt class="py-decorator">abstractmethod</tt> </tt>
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<a name="Command.execute"></a><div id="Command.execute-def"><a name="L43"></a><tt class="py-lineno">43</tt> <a class="py-toggle" href="#" id="Command.execute-toggle" onclick="return toggle('Command.execute');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="pypat.behavioral.command.Command-class.html#execute">execute</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Command.execute-collapsed" style="display:none;" pad="++" indent="++++++++"></div><div id="Command.execute-expanded"><a name="L44"></a><tt class="py-lineno">44</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L45"></a><tt class="py-lineno">45</tt> <tt class="py-line"><tt class="py-docstring"> Abstract method for executing an action.</tt> </tt>
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<a name="L46"></a><tt class="py-lineno">46</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="L47"></a><tt class="py-lineno">47</tt> <tt class="py-line"> <tt class="py-keyword">pass</tt> </tt>
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</div><a name="L48"></a><tt class="py-lineno">48</tt> <tt class="py-line"> </tt>
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<a name="L49"></a><tt class="py-lineno">49</tt> <tt class="py-line"> <tt class="py-decorator">@</tt><tt class="py-decorator">abstractmethod</tt> </tt>
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<a name="Command.unexecute"></a><div id="Command.unexecute-def"><a name="L50"></a><tt class="py-lineno">50</tt> <a class="py-toggle" href="#" id="Command.unexecute-toggle" onclick="return toggle('Command.unexecute');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="pypat.behavioral.command.Command-class.html#unexecute">unexecute</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Command.unexecute-collapsed" style="display:none;" pad="++" indent="++++++++"></div><div id="Command.unexecute-expanded"><a name="L51"></a><tt class="py-lineno">51</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L52"></a><tt class="py-lineno">52</tt> <tt class="py-line"><tt class="py-docstring"> Abstract method for unexecuting an action.</tt> </tt>
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<a name="L53"></a><tt class="py-lineno">53</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="L54"></a><tt class="py-lineno">54</tt> <tt class="py-line"> <tt class="py-keyword">pass</tt> </tt>
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</div></div><a name="L55"></a><tt class="py-lineno">55</tt> <tt class="py-line"> </tt>
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<a name="Invoker"></a><div id="Invoker-def"><a name="L56"></a><tt class="py-lineno">56</tt> <tt class="py-line"> </tt>
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<a name="L57"></a><tt class="py-lineno">57</tt> <a class="py-toggle" href="#" id="Invoker-toggle" onclick="return toggle('Invoker');">-</a><tt class="py-line"><tt class="py-keyword">class</tt> <a class="py-def-name" href="pypat.behavioral.command.Invoker-class.html">Invoker</a><tt class="py-op">(</tt><tt class="py-base-class">object</tt><tt class="py-op">,</tt> <tt class="py-base-class">metaclass</tt><tt class="py-op">=</tt><tt class="py-base-class">ABCMeta</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Invoker-collapsed" style="display:none;" pad="++" indent="++++"></div><div id="Invoker-expanded"><a name="L58"></a><tt class="py-lineno">58</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L59"></a><tt class="py-lineno">59</tt> <tt class="py-line"><tt class="py-docstring"> Abstract Invoker class as part of the Command pattern.</tt> </tt>
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<a name="L60"></a><tt class="py-lineno">60</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
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<a name="L61"></a><tt class="py-lineno">61</tt> <tt class="py-line"><tt class="py-docstring"> - External Usage documentation: U{https://github.com/tylerlaberge/PyPatterns/wiki/Behavioral-Pattern-Usage}</tt> </tt>
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<a name="L62"></a><tt class="py-lineno">62</tt> <tt class="py-line"><tt class="py-docstring"> - External Command Pattern documentation: U{https://en.wikipedia.org/wiki/Command_pattern}</tt> </tt>
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<a name="L63"></a><tt class="py-lineno">63</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="Invoker.__init__"></a><div id="Invoker.__init__-def"><a name="L64"></a><tt class="py-lineno">64</tt> <a class="py-toggle" href="#" id="Invoker.__init__-toggle" onclick="return toggle('Invoker.__init__');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="pypat.behavioral.command.Invoker-class.html#__init__">__init__</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">,</tt> <tt class="py-param">valid_commands</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Invoker.__init__-collapsed" style="display:none;" pad="++" indent="++++++++"></div><div id="Invoker.__init__-expanded"><a name="L65"></a><tt class="py-lineno">65</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L66"></a><tt class="py-lineno">66</tt> <tt class="py-line"><tt class="py-docstring"> Initialize a new Invoker instance.</tt> </tt>
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<a name="L67"></a><tt class="py-lineno">67</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
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<a name="L68"></a><tt class="py-lineno">68</tt> <tt class="py-line"><tt class="py-docstring"> @param valid_commands: A list of command classes this invoker can handle.</tt> </tt>
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<a name="L69"></a><tt class="py-lineno">69</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="L70"></a><tt class="py-lineno">70</tt> <tt class="py-line"> <tt class="py-name">self</tt><tt class="py-op">.</tt><tt class="py-name">_history</tt> <tt class="py-op">=</tt> <tt class="py-op">[</tt><tt class="py-op">]</tt> </tt>
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<a name="L71"></a><tt class="py-lineno">71</tt> <tt class="py-line"> <tt class="py-name">self</tt><tt class="py-op">.</tt><tt class="py-name">_valid_commands</tt> <tt class="py-op">=</tt> <tt class="py-name">valid_commands</tt> </tt>
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</div><a name="L72"></a><tt class="py-lineno">72</tt> <tt class="py-line"> </tt>
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<a name="Invoker.execute"></a><div id="Invoker.execute-def"><a name="L73"></a><tt class="py-lineno">73</tt> <a class="py-toggle" href="#" id="Invoker.execute-toggle" onclick="return toggle('Invoker.execute');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="pypat.behavioral.command.Invoker-class.html#execute">execute</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">,</tt> <tt class="py-param">command</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Invoker.execute-collapsed" style="display:none;" pad="++" indent="++++++++"></div><div id="Invoker.execute-expanded"><a name="L74"></a><tt class="py-lineno">74</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L75"></a><tt class="py-lineno">75</tt> <tt class="py-line"><tt class="py-docstring"> Execute a command.</tt> </tt>
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<a name="L76"></a><tt class="py-lineno">76</tt> <tt class="py-line"><tt class="py-docstring"></tt> </tt>
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<a name="L77"></a><tt class="py-lineno">77</tt> <tt class="py-line"><tt class="py-docstring"> @param command: A command for the invoker to execute.</tt> </tt>
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<a name="L78"></a><tt class="py-lineno">78</tt> <tt class="py-line"><tt class="py-docstring"> @type command: Command</tt> </tt>
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<a name="L79"></a><tt class="py-lineno">79</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<a name="L80"></a><tt class="py-lineno">80</tt> <tt class="py-line"> <tt class="py-keyword">if</tt> <tt id="link-0" class="py-name" targets="Module pypat.behavioral.command=pypat.behavioral.command-module.html"><a title="pypat.behavioral.command" class="py-name" href="#" onclick="return doclink('link-0', 'command', 'link-0');">command</a></tt><tt class="py-op">.</tt><tt class="py-name">__class__</tt> <tt class="py-keyword">not</tt> <tt class="py-keyword">in</tt> <tt class="py-name">self</tt><tt class="py-op">.</tt><tt class="py-name">_valid_commands</tt><tt class="py-op">:</tt> </tt>
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<a name="L81"></a><tt class="py-lineno">81</tt> <tt class="py-line"> <tt class="py-keyword">raise</tt> <tt class="py-name">AttributeError</tt><tt class="py-op">(</tt><tt class="py-string">'Invalid Command'</tt><tt class="py-op">)</tt> </tt>
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<a name="L82"></a><tt class="py-lineno">82</tt> <tt class="py-line"> <tt class="py-keyword">else</tt><tt class="py-op">:</tt> </tt>
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<a name="L83"></a><tt class="py-lineno">83</tt> <tt class="py-line"> <tt class="py-name">self</tt><tt class="py-op">.</tt><tt class="py-name">_history</tt><tt class="py-op">.</tt><tt class="py-name">append</tt><tt class="py-op">(</tt><tt id="link-1" class="py-name"><a title="pypat.behavioral.command" class="py-name" href="#" onclick="return doclink('link-1', 'command', 'link-0');">command</a></tt><tt class="py-op">)</tt> </tt>
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<a name="L84"></a><tt class="py-lineno">84</tt> <tt class="py-line"> <tt class="py-keyword">return</tt> <tt id="link-2" class="py-name"><a title="pypat.behavioral.command" class="py-name" href="#" onclick="return doclink('link-2', 'command', 'link-0');">command</a></tt><tt class="py-op">.</tt><tt id="link-3" class="py-name" targets="Method pypat.behavioral.command.Command.execute()=pypat.behavioral.command.Command-class.html#execute,Method pypat.behavioral.command.Invoker.execute()=pypat.behavioral.command.Invoker-class.html#execute"><a title="pypat.behavioral.command.Command.execute
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pypat.behavioral.command.Invoker.execute" class="py-name" href="#" onclick="return doclink('link-3', 'execute', 'link-3');">execute</a></tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
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</div><a name="L85"></a><tt class="py-lineno">85</tt> <tt class="py-line"> </tt>
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<a name="Invoker.undo"></a><div id="Invoker.undo-def"><a name="L86"></a><tt class="py-lineno">86</tt> <a class="py-toggle" href="#" id="Invoker.undo-toggle" onclick="return toggle('Invoker.undo');">-</a><tt class="py-line"> <tt class="py-keyword">def</tt> <a class="py-def-name" href="pypat.behavioral.command.Invoker-class.html#undo">undo</a><tt class="py-op">(</tt><tt class="py-param">self</tt><tt class="py-op">)</tt><tt class="py-op">:</tt> </tt>
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</div><div id="Invoker.undo-collapsed" style="display:none;" pad="++" indent="++++++++"></div><div id="Invoker.undo-expanded"><a name="L87"></a><tt class="py-lineno">87</tt> <tt class="py-line"> <tt class="py-docstring">"""</tt> </tt>
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<a name="L88"></a><tt class="py-lineno">88</tt> <tt class="py-line"><tt class="py-docstring"> Undo the last command.</tt> </tt>
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<a name="L89"></a><tt class="py-lineno">89</tt> <tt class="py-line"><tt class="py-docstring"> """</tt> </tt>
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<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 class="py-op">.</tt><tt class="py-name">_history</tt><tt class="py-op">.</tt><tt class="py-name">pop</tt><tt class="py-op">(</tt><tt class="py-op">)</tt><tt class="py-op">.</tt><tt id="link-4" class="py-name" targets="Method pypat.behavioral.command.Command.unexecute()=pypat.behavioral.command.Command-class.html#unexecute"><a title="pypat.behavioral.command.Command.unexecute" class="py-name" href="#" onclick="return doclink('link-4', 'unexecute', 'link-4');">unexecute</a></tt><tt class="py-op">(</tt><tt class="py-op">)</tt> </tt>
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</div></div><a name="L91"></a><tt class="py-lineno">91</tt> <tt class="py-line"> </tt><script type="text/javascript">
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