statemachinefactory.html

MINA+API 关于MINA的API

<a name="119" href="#119">119</a> <em class="jxr_javadoccomment">     * Creates a new {@link StateMachine} from the specified handler objects and</em>
<a name="120" href="#120">120</a> <em class="jxr_javadoccomment">     * using the {@link State} with the specified id as start state.</em>
<a name="121" href="#121">121</a> <em class="jxr_javadoccomment">     * </em>
<a name="122" href="#122">122</a> <em class="jxr_javadoccomment">     * @param start the id of the start {@link State} to use.</em>
<a name="123" href="#123">123</a> <em class="jxr_javadoccomment">     * @param handler the first object containing the annotations describing the </em>
<a name="124" href="#124">124</a> <em class="jxr_javadoccomment">     *        state machine.</em>
<a name="125" href="#125">125</a> <em class="jxr_javadoccomment">     * @param handlers zero or more additional objects containing the </em>
<a name="126" href="#126">126</a> <em class="jxr_javadoccomment">     *        annotations describing the state machine.</em>
<a name="127" href="#127">127</a> <em class="jxr_javadoccomment">     * @return the {@link StateMachine} object.</em>
<a name="128" href="#128">128</a> <em class="jxr_javadoccomment">     */</em>
<a name="129" href="#129">129</a>     <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/mina/statemachine/StateMachine.html">StateMachine</a> create(String start, Object handler, Object... handlers) {
<a name="130" href="#130">130</a>         
<a name="131" href="#131">131</a>         Map&lt;String, State&gt; states = <strong class="jxr_keyword">new</strong> HashMap&lt;String, State&gt;();
<a name="132" href="#132">132</a>         List&lt;Object&gt; handlersList = <strong class="jxr_keyword">new</strong> ArrayList&lt;Object&gt;(1 + handlers.length);
<a name="133" href="#133">133</a>         handlersList.add(handler);
<a name="134" href="#134">134</a>         handlersList.addAll(Arrays.asList(handlers));
<a name="135" href="#135">135</a>         
<a name="136" href="#136">136</a>         LinkedList&lt;Field&gt; fields = <strong class="jxr_keyword">new</strong> LinkedList&lt;Field&gt;();
<a name="137" href="#137">137</a>         <strong class="jxr_keyword">for</strong> (Object h : handlersList) {
<a name="138" href="#138">138</a>             fields.addAll(getFields(h instanceof Class ? (Class&lt;?&gt;) h : h.getClass()));
<a name="139" href="#139">139</a>         }
<a name="140" href="#140">140</a>         <strong class="jxr_keyword">for</strong> (State state : createStates(fields)) {
<a name="141" href="#141">141</a>             states.put(state.getId(), state);
<a name="142" href="#142">142</a>         }
<a name="143" href="#143">143</a> 
<a name="144" href="#144">144</a>         <strong class="jxr_keyword">if</strong> (!states.containsKey(start)) {
<a name="145" href="#145">145</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/statemachine/StateMachineCreationException.html">StateMachineCreationException</a>(<span class="jxr_string">"Start state '"</span> + start + <span class="jxr_string">"' not found."</span>);
<a name="146" href="#146">146</a>         }
<a name="147" href="#147">147</a> 
<a name="148" href="#148">148</a>         setupTransitions(transitionAnnotation, transitionsAnnotation, states, handlersList);
<a name="149" href="#149">149</a> 
<a name="150" href="#150">150</a>         <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/statemachine/StateMachine.html">StateMachine</a>(states.values(), start);
<a name="151" href="#151">151</a>     }
<a name="152" href="#152">152</a> 
<a name="153" href="#153">153</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> setupTransitions(Class&lt;? <strong class="jxr_keyword">extends</strong> Annotation&gt; transitionAnnotation, 
<a name="154" href="#154">154</a>             Class&lt;? <strong class="jxr_keyword">extends</strong> Annotation&gt; transitionsAnnotation, Map&lt;String, State&gt; states, List&lt;Object&gt; handlers) {
<a name="155" href="#155">155</a>         <strong class="jxr_keyword">for</strong> (Object handler : handlers) {
<a name="156" href="#156">156</a>             setupTransitions(transitionAnnotation, transitionsAnnotation, states, handler);
<a name="157" href="#157">157</a>         }
<a name="158" href="#158">158</a>     }
<a name="159" href="#159">159</a>     
<a name="160" href="#160">160</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> setupTransitions(Class&lt;? <strong class="jxr_keyword">extends</strong> Annotation&gt; transitionAnnotation, 
<a name="161" href="#161">161</a>             Class&lt;? <strong class="jxr_keyword">extends</strong> Annotation&gt; transitionsAnnotation, Map&lt;String, State&gt; states, Object handler) {
<a name="162" href="#162">162</a>         
<a name="163" href="#163">163</a>         Method[] methods = handler.getClass().getDeclaredMethods();
<a name="164" href="#164">164</a>         Arrays.sort(methods, <strong class="jxr_keyword">new</strong> Comparator&lt;Method&gt;() {
<a name="165" href="#165">165</a>             <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">int</strong> compare(Method m1, Method m2) {
<a name="166" href="#166">166</a>                 <strong class="jxr_keyword">return</strong> m1.toString().compareTo(m2.toString());
<a name="167" href="#167">167</a>             }
<a name="168" href="#168">168</a>         });
<a name="169" href="#169">169</a>         
<a name="170" href="#170">170</a>         <strong class="jxr_keyword">for</strong> (Method m : methods) {
<a name="171" href="#171">171</a>             List&lt;TransitionWrapper&gt; transitionAnnotations = <strong class="jxr_keyword">new</strong> ArrayList&lt;TransitionWrapper&gt;();
<a name="172" href="#172">172</a>             <strong class="jxr_keyword">if</strong> (m.isAnnotationPresent(transitionAnnotation)) {
<a name="173" href="#173">173</a>                 transitionAnnotations.add(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/statemachine/StateMachineFactory.html">TransitionWrapper</a>(transitionAnnotation, m.getAnnotation(transitionAnnotation)));
<a name="174" href="#174">174</a>             }
<a name="175" href="#175">175</a>             <strong class="jxr_keyword">if</strong> (m.isAnnotationPresent(transitionsAnnotation)) {
<a name="176" href="#176">176</a>                 transitionAnnotations.addAll(Arrays.asList(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/statemachine/StateMachineFactory.html">TransitionsWrapper</a>(transitionAnnotation, 
<a name="177" href="#177">177</a>                         transitionsAnnotation, m.getAnnotation(transitionsAnnotation)).value()));
<a name="178" href="#178">178</a>             }
<a name="179" href="#179">179</a>             
<a name="180" href="#180">180</a>             <strong class="jxr_keyword">if</strong> (transitionAnnotations.isEmpty()) {
<a name="181" href="#181">181</a>                 <strong class="jxr_keyword">continue</strong>;
<a name="182" href="#182">182</a>             }
<a name="183" href="#183">183</a>             
<a name="184" href="#184">184</a>             <strong class="jxr_keyword">for</strong> (TransitionWrapper annotation : transitionAnnotations) {
<a name="185" href="#185">185</a>                 Object[] eventIds = annotation.on();
<a name="186" href="#186">186</a>                 <strong class="jxr_keyword">if</strong> (eventIds.length == 0) {
<a name="187" href="#187">187</a>                     <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/statemachine/StateMachineCreationException.html">StateMachineCreationException</a>(<span class="jxr_string">"Error encountered "</span> 
<a name="188" href="#188">188</a>                             + <span class="jxr_string">"when processing method "</span> + m
<a name="189" href="#189">189</a>                             + <span class="jxr_string">". No event ids specified."</span>);
<a name="190" href="#190">190</a>                 }
<a name="191" href="#191">191</a>                 <strong class="jxr_keyword">if</strong> (annotation.in().length == 0) {
<a name="192" href="#192">192</a>                     <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/statemachine/StateMachineCreationException.html">StateMachineCreationException</a>(<span class="jxr_string">"Error encountered "</span> 
<a name="193" href="#193">193</a>                             + <span class="jxr_string">"when processing method "</span> + m
<a name="194" href="#194">194</a>                             + <span class="jxr_string">". No states specified."</span>);
<a name="195" href="#195">195</a>                 }
<a name="196" href="#196">196</a>                 
<a name="197" href="#197">197</a>                 <a href="../../../../org/apache/mina/statemachine/annotation/State.html">State</a> next = <strong class="jxr_keyword">null</strong>;
<a name="198" href="#198">198</a>                 <strong class="jxr_keyword">if</strong> (!annotation.next().equals(Transition.SELF)) {
<a name="199" href="#199">199</a>                     next = states.get(annotation.next());
<a name="200" href="#200">200</a>                     <strong class="jxr_keyword">if</strong> (next == <strong class="jxr_keyword">null</strong>) {
<a name="201" href="#201">201</a>                         <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/statemachine/StateMachineCreationException.html">StateMachineCreationException</a>(<span class="jxr_string">"Error encountered "</span> 
<a name="202" href="#202">202</a>                                 + <span class="jxr_string">"when processing method "</span> + m
<a name="203" href="#203">203</a>                                 + <span class="jxr_string">". Unknown next state: "</span> + annotation.next() + <span class="jxr_string">"."</span>);
<a name="204" href="#204">204</a>                     }
<a name="205" href="#205">205</a>                 }
<a name="206" href="#206">206</a>                 
<a name="207" href="#207">207</a>                 <strong class="jxr_keyword">for</strong> (Object event : eventIds) {
<a name="208" href="#208">208</a>                     <strong class="jxr_keyword">if</strong> (event == <strong class="jxr_keyword">null</strong>) {
<a name="209" href="#209">209</a>                         event = Event.WILDCARD_EVENT_ID;
<a name="210" href="#210">210</a>                     }
<a name="211" href="#211">211</a>                     <strong class="jxr_keyword">if</strong> (!(event instanceof String)) {
<a name="212" href="#212">212</a>                         event = event.toString();
<a name="213" href="#213">213</a>                     }
<a name="214" href="#214">214</a>                     <strong class="jxr_keyword">for</strong> (String in : annotation.in()) {
<a name="215" href="#215">215</a>                         <a href="../../../../org/apache/mina/statemachine/annotation/State.html">State</a> state = states.get(in);
<a name="216" href="#216">216</a>                         <strong class="jxr_keyword">if</strong> (state == <strong class="jxr_keyword">null</strong>) {
<a name="217" href="#217">217</a>                             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/statemachine/StateMachineCreationException.html">StateMachineCreationException</a>(<span class="jxr_string">"Error encountered "</span> 
<a name="218" href="#218">218</a>                                     + <span class="jxr_string">"when processing method "</span>
<a name="219" href="#219">219</a>                                     + m + <span class="jxr_string">". Unknown state: "</span> + in + <span class="jxr_string">"."</span>);
<a name="220" href="#220">220</a>                         }
<a name="221" href="#221">221</a> 
<a name="222" href="#222">222</a>                         state.addTransition(<strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/statemachine/transition/MethodTransition.html">MethodTransition</a>(event, next, m, handler), annotation.weight());
<a name="223" href="#223">223</a>                     }
<a name="224" href="#224">224</a>                 }
<a name="225" href="#225">225</a>             }
<a name="226" href="#226">226</a>         }
<a name="227" href="#227">227</a>     }
<a name="228" href="#228">228</a> 
<a name="229" href="#229">229</a>     <strong class="jxr_keyword">static</strong> List&lt;Field&gt; getFields(Class&lt;?&gt; clazz) {
<a name="230" href="#230">230</a>         LinkedList&lt;Field&gt; fields = <strong class="jxr_keyword">new</strong> LinkedList&lt;Field&gt;();
<a name="231" href="#231">231</a> 
<a name="232" href="#232">232</a>         <strong class="jxr_keyword">for</strong> (Field f : clazz.getDeclaredFields()) {
<a name="233" href="#233">233</a>             <strong class="jxr_keyword">if</strong> (!f.isAnnotationPresent(org.apache.mina.statemachine.annotation.State.<strong class="jxr_keyword">class</strong>)) {
<a name="234" href="#234">234</a>                 <strong class="jxr_keyword">continue</strong>;
<a name="235" href="#235">235</a>             }
<a name="236" href="#236">236</a> 
<a name="237" href="#237">237</a>             <strong class="jxr_keyword">if</strong> ((f.getModifiers() &amp; Modifier.STATIC) == 0 
<a name="238" href="#238">238</a>                     || (f.getModifiers() &amp; Modifier.FINAL) == 0
<a name="239" href="#239">239</a>                     || !f.getType().equals(String.<strong class="jxr_keyword">class</strong>)) {
<a name="240" href="#240">240</a>                 <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/mina/statemachine/StateMachineCreationException.html">StateMachineCreationException</a>(<span class="jxr_string">"Error encountered when "</span> 
<a name="241" href="#241">241</a>                         + <span class="jxr_string">"processing field "</span> + f
<a name="242" href="#242">242</a>                         + <span class="jxr_string">". Only static final "</span> 
<a name="243" href="#243">243</a>                         + <span class="jxr_string">"String fields can be used with the @State "</span> 
<a name="244" href="#244">244</a>                         + <span class="jxr_string">"annotation."</span>);
<a name="245" href="#245">245</a>             }
<a name="246" href="#246">246</a>