CommandServlet.java<TITLE> <LINK rel="stylesheet" href="../..//java.css" type="text/css" media="all" /> </HEAD> <BODY id="java">  <SCRIPT type="text/javascript" src="../..//java.js" /> <TABLE class="tabs"><TR> <TD id="tab_colour" class="active"><A HREF='javascript:set_style("colour")'>Coloured</A></TD> <TD id="tab_raw" class="inactive"><A HREF='javascript:set_style("raw")'>Raw</A></TD> </TR></TABLE> <DIV id="colour" class="display"> <PRE class="colour" id="code"> <SPAN id='line_0' class='line_number'> </SPAN> <SPAN id='line_1' class='line_number'> 1</SPAN><span class='comment'>// Copyright 2007, Tim Vernum</span> <SPAN id='line_2' class='line_number'> 2</SPAN><span class='comment'>// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation </span> <SPAN id='line_3' class='line_number'> 3</SPAN><span class='comment'>// files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,</span> <SPAN id='line_4' class='line_number'> 4</SPAN><span class='comment'>// modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the</span> <SPAN id='line_5' class='line_number'> 5</SPAN><span class='comment'>// Software is furnished to do so, subject to the following conditions:</span> <SPAN id='line_6' class='line_number'> 6</SPAN><span class='comment'>// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.</span> <SPAN id='line_7' class='line_number'> 7</SPAN><span class='comment'>// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE </span> <SPAN id='line_8' class='line_number'> 8</SPAN><span class='comment'>// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR </span> <SPAN id='line_9' class='line_number'> 9</SPAN><span class='comment'>// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,</span> <SPAN id='line_10' class='line_number'>10</SPAN><span class='comment'>// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.</span> <SPAN id='line_11' class='line_number'>11</SPAN> <SPAN id='line_12' class='line_number'>12</SPAN><span class='package'>package</span> security<span class='operator'>.</span>servlet<span class='operator'>;</span> <SPAN id='line_13' class='line_number'>13</SPAN> <SPAN id='line_14' class='line_number'>14</SPAN><span class='package'>import</span> java<span class='operator'>.</span>io<span class='operator'>.</span><span class='type'>IOException</span><span class='operator'>;</span> <SPAN id='line_15' class='line_number'>15</SPAN> <SPAN id='line_16' class='line_number'>16</SPAN><span class='package'>import</span> javax<span class='operator'>.</span>servlet<span class='operator'>.</span><span class='type'>ServletException</span><span class='operator'>;</span> <SPAN id='line_17' class='line_number'>17</SPAN><span class='package'>import</span> javax<span class='operator'>.</span>servlet<span class='operator'>.</span>http<span class='operator'>.</span>HttpServlet<span class='operator'>;</span> <SPAN id='line_18' class='line_number'>18</SPAN><span class='package'>import</span> javax<span class='operator'>.</span>servlet<span class='operator'>.</span>http<span class='operator'>.</span>HttpServletRequest<span class='operator'>;</span> <SPAN id='line_19' class='line_number'>19</SPAN><span class='package'>import</span> javax<span class='operator'>.</span>servlet<span class='operator'>.</span>http<span class='operator'>.</span>HttpServletResponse<span class='operator'>;</span> <SPAN id='line_20' class='line_number'>20</SPAN> <SPAN id='line_21' class='line_number'>21</SPAN><span class='package'>import</span> security<span class='operator'>.</span>command<span class='operator'>.</span>Command<span class='operator'>;</span> <SPAN id='line_22' class='line_number'>22</SPAN><span class='package'>import</span> security<span class='operator'>.</span>command<span class='operator'>.</span>CommandSet<span class='operator'>;</span> <SPAN id='line_23' class='line_number'>23</SPAN><span class='package'>import</span> security<span class='operator'>.</span>user<span class='operator'>.</span>ServletUser<span class='operator'>;</span> <SPAN id='line_24' class='line_number'>24</SPAN><span class='package'>import</span> security<span class='operator'>.</span>user<span class='operator'>.</span>UserContext<span class='operator'>;</span> <SPAN id='line_25' class='line_number'>25</SPAN> <SPAN id='line_26' class='line_number'>26</SPAN><span class='access'>public</span> <span class='typedef'>class</span> CommandServlet <span class='inherit'>extends</span> HttpServlet <SPAN id='line_27' class='line_number'>27</SPAN>{ <SPAN id='line_28' class='line_number'>28</SPAN> <span class='access'>private</span> CommandSet <span class='member'>_commands</span><span class='operator'>;</span> <SPAN id='line_29' class='line_number'>29</SPAN> <SPAN id='line_30' class='line_number'>30</SPAN> <span class='access'>public</span> <span class='type'>void</span> init() <span class='throw'>throws</span> <span class='type'>ServletException</span> <SPAN id='line_31' class='line_number'>31</SPAN> { <SPAN id='line_32' class='line_number'>32</SPAN> <span class='type'>String</span> commandSetClassName <span class='operator'>=</span> getInitParameter(<span class='string'>"commands"</span>)<span class='operator'>;</span> <SPAN id='line_33' class='line_number'>33</SPAN> <span class='throw'>try</span> <SPAN id='line_34' class='line_number'>34</SPAN> { <SPAN id='line_35' class='line_number'>35</SPAN> <span class='member'>_commands</span> <span class='operator'>=</span> (CommandSet) buildCommandSet(commandSetClassName)<span class='operator'>;</span> <SPAN id='line_36' class='line_number'>36</SPAN> } <SPAN id='line_37' class='line_number'>37</SPAN> <span class='throw'>catch</span> (<span class='type'>ClassNotFoundException</span> e) <SPAN id='line_38' class='line_number'>38</SPAN> { <SPAN id='line_39' class='line_number'>39</SPAN> <span class='throw'>throw</span> <span class='operator'>new</span> <span class='type'>ServletException</span>(CommandSet<span class='operator'>.</span><span class='typedef'>class</span> <span class='operator'>+</span> <span class='string'>" "</span> <span class='operator'>+</span> commandSetClassName <span class='operator'>+</span> <span class='string'>" not found"</span><span class='operator'>,</span> e)<span class='operator'>;</span> <SPAN id='line_40' class='line_number'>40</SPAN> } <SPAN id='line_41' class='line_number'>41</SPAN> <span class='throw'>catch</span> (<span class='type'>InstantiationException</span> e) <SPAN id='line_42' class='line_number'>42</SPAN> { <SPAN id='line_43' class='line_number'>43</SPAN> <span class='throw'>throw</span> <span class='operator'>new</span> <span class='type'>ServletException</span>(CommandSet<span class='operator'>.</span><span class='typedef'>class</span> <span class='operator'>+</span> <span class='string'>" "</span> <span class='operator'>+</span> commandSetClassName <span class='operator'>+</span> <span class='string'>" cannot be instantiated"</span><span class='operator'>,</span> e)<span class='operator'>;</span> <SPAN id='line_44' class='line_number'>44</SPAN> } <SPAN id='line_45' class='line_number'>45</SPAN> <span class='throw'>catch</span> (<span class='type'>IllegalAccessException</span> e) <SPAN id='line_46' class='line_number'>46</SPAN> { <SPAN id='line_47' class='line_number'>47</SPAN> <span class='throw'>throw</span> <span class='operator'>new</span> <span class='type'>ServletException</span>(CommandSet<span class='operator'>.</span><span class='typedef'>class</span> <span class='operator'>+</span> <span class='string'>" "</span> <span class='operator'>+</span> commandSetClassName <span class='operator'>+</span> <span class='string'>" cannot be accessed"</span><span class='operator'>,</span> e)<span class='operator'>;</span> <SPAN id='line_48' class='line_number'>48</SPAN> } <SPAN id='line_49' class='line_number'>49</SPAN> } <SPAN id='line_50' class='line_number'>50</SPAN> <SPAN id='line_51' class='line_number'>51</SPAN> <span class='access'>private</span> CommandSet buildCommandSet(<span class='type'>String</span> commandSetClassName) <span class='throw'>throws</span> <span class='type'>ClassNotFoundException</span><span class='operator'>,</span> <span class='type'>ServletException</span><span class='operator'>,</span> <SPAN id='line_52' class='line_number'>52</SPAN> <span class='type'>InstantiationException</span><span class='operator'>,</span> <span class='type'>IllegalAccessException</span> <SPAN id='line_53' class='line_number'>53</SPAN> { <SPAN id='line_54' class='line_number'>54</SPAN> <span class='type'>Class</span>< <span class='operator'>?</span> > commandSetClass <span class='operator'>=</span> <span class='type'>Class</span><span class='operator'>.</span>forName(commandSetClassName)<span class='operator'>;</span> <SPAN id='line_55' class='line_number'>55</SPAN> <span class='loop'>if</span> (!CommandSet<span class='operator'>.</span><span class='typedef'>class</span><span class='operator'>.</span>isInstance(commandSetClass)) <SPAN id='line_56' class='line_number'>56</SPAN> { <SPAN id='line_57' class='line_number'>57</SPAN> <span class='throw'>throw</span> <span class='operator'>new</span> <span class='type'>ServletException</span>(<span class='string'>"Class "</span> <span class='operator'>+</span> commandSetClassName <span class='operator'>+</span> <span class='string'>" is not a "</span> <span class='operator'>+</span> CommandSet<span class='operator'>.</span><span class='typedef'>class</span>)<span class='operator'>;</span> <SPAN id='line_58' class='line_number'>58</SPAN> } <SPAN id='line_59' class='line_number'>59</SPAN> <span class='type'>Object</span> instance <span class='operator'>=</span> commandSetClass<span class='operator'>.</span>newInstance()<span class='operator'>;</span> <SPAN id='line_60' class='line_number'>60</SPAN> <span class='flow'>return</span> (CommandSet) instance<span class='operator'>;</span> <SPAN id='line_61' class='line_number'>61</SPAN> } <SPAN id='line_62' class='line_number'>62</SPAN> <SPAN id='line_63' class='line_number'>63</SPAN> <span class='access'>protected</span> <span class='type'>void</span> service(HttpServletRequest request<span class='operator'>,</span> HttpServletResponse response) <span class='throw'>throws</span> <span class='type'>ServletException</span><span class='operator'>,</span> <span class='type'>IOException</span> <SPAN id='line_64' class='line_number'>64</SPAN> { <SPAN id='line_65' class='line_number'>65</SPAN> UserContext<span class='operator'>.</span>begin(<span class='operator'>new</span> ServletUser(request))<span class='operator'>;</span> <SPAN id='line_66' class='line_number'>66</SPAN> <SPAN id='line_67' class='line_number'>67</SPAN> <span class='type'>String</span> path <span class='operator'>=</span> request<span class='operator'>.</span>getPathInfo()<span class='operator'>;</span> <SPAN id='line_68' class='line_number'>68</SPAN> <span class='loop'>while</span> (path<span class='operator'>.</span>length() > <span class='number'>0</span> && path<span class='operator'>.</span>charAt(<span class='number'>0</span>) <span class='operator'>=</span><span class='operator'>=</span> '/') <SPAN id='line_69' class='line_number'>69</SPAN> { <SPAN id='line_70' class='line_number'>70</SPAN> path <span class='operator'>=</span> path<span class='operator'>.</span>substring(<span class='number'>1</span>)<span class='operator'>;</span> <SPAN id='line_71' class='line_number'>71</SPAN> } <SPAN id='line_72' class='line_number'>72</SPAN> <span class='loop'>if</span> (path<span class='operator'>.</span>length() <span class='operator'>=</span><span class='operator'>=</span> <span class='number'>0</span>) <SPAN id='line_73' class='line_number'>73</SPAN> { <SPAN id='line_74' class='line_number'>74</SPAN> response<span class='operator'>.</span>sendError(HttpServletResponse<span class='operator'>.</span>SC_NOT_FOUND)<span class='operator'>;</span> <SPAN id='line_75' class='line_number'>75</SPAN> } <SPAN id='line_76' class='line_number'>76</SPAN> Command command <span class='operator'>=</span> <span class='member'>_commands</span><span class='operator'>.</span>getCommand(path)<span class='operator'>;</span> <SPAN id='line_77' class='line_number'>77</SPAN> <span class='loop'>if</span> (command <span class='operator'>=</span><span class='operator'>=</span> <span class='operator'>null</span>) <SPAN id='line_78' class='line_number'>78</SPAN> { <SPAN id='line_79' class='line_number'>79</SPAN> response<span class='operator'>.</span>sendError(HttpServletResponse<span class='operator'>.</span>SC_NOT_FOUND)<span class='operator'>;</span> <SPAN id='line_80' class='line_number'>80</SPAN> } <SPAN id='line_81' class='line_number'>81</SPAN> <SPAN id='line_82' class='line_number'>82</SPAN> command<span class='operator'>.</span>execute(request<span class='operator'>,</span> response<span class='operator'>,</span> getServletContext())<span class='operator'>;</span> <SPAN id='line_83' class='line_number'>83</SPAN> } <SPAN id='line_84' class='line_number'>84</SPAN>} <SPAN id='line_last' class='line_number'> </SPAN> </PRE></DIV> <DIV id='raw' class='hidden'><PRE class='raw'>// Copyright 2007, Tim Vernum // Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation // files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, // modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the // Software is furnished to do so, subject to the following conditions: // The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE // WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. package security.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import security.command.Command; import security.command.CommandSet; import security.user.ServletUser; import security.user.UserContext; public class CommandServlet extends HttpServlet { private CommandSet _commands; public void init() throws ServletException { String commandSetClassName = getInitParameter("commands"); try { _commands = (CommandSet) buildCommandSet(commandSetClassName); } catch (ClassNotFoundException e) { throw new ServletException(CommandSet.class + " " + commandSetClassName + " not found", e); } catch (InstantiationException e) { throw new ServletException(CommandSet.class + " " + commandSetClassName + " cannot be instantiated", e); } catch (IllegalAccessException e) { throw new ServletException(CommandSet.class + " " + commandSetClassName + " cannot be accessed", e); } } private CommandSet buildCommandSet(String commandSetClassName) throws ClassNotFoundException, ServletException, InstantiationException, IllegalAccessException { Class< ? > commandSetClass = Class.forName(commandSetClassName); if (!CommandSet.class.isInstance(commandSetClass)) { throw new ServletException("Class " + commandSetClassName + " is not a " + CommandSet.class); } Object instance = commandSetClass.newInstance(); return (CommandSet) instance; } protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { UserContext.begin(new ServletUser(request)); String path = request.getPathInfo(); while (path.length() > 0 && path.charAt(0) == '/') { path = path.substring(1); } if (path.length() == 0) { response.sendError(HttpServletResponse.SC_NOT_FOUND); } Command command = _commands.getCommand(path); if (command == null) { response.sendError(HttpServletResponse.SC_NOT_FOUND); } command.execute(request, response, getServletContext()); } }</PRE></DIV> </BODY></HTML>