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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a>
<span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a>
<span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a>
<span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a>
<span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<span class="sourceLineNo">011</span> *<a name="line.11"></a>
<span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * software distributed under the License is distributed on an<a name="line.13"></a>
<span class="sourceLineNo">014</span> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY<a name="line.14"></a>
<span class="sourceLineNo">015</span> * KIND, either express or implied. See the License for the<a name="line.15"></a>
<span class="sourceLineNo">016</span> * specific language governing permissions and limitations<a name="line.16"></a>
<span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a>
<span class="sourceLineNo">018</span> *<a name="line.18"></a>
<span class="sourceLineNo">019</span> */<a name="line.19"></a>
<span class="sourceLineNo">020</span>package org.apache.mina.statemachine.transition;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.lang.reflect.InvocationTargetException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.lang.reflect.Method;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.Arrays;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.mina.statemachine.State;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.mina.statemachine.StateMachine;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.mina.statemachine.context.StateContext;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.slf4j.Logger;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.slf4j.LoggerFactory;<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>/**<a name="line.32"></a>
<span class="sourceLineNo">033</span> * {@link SelfTransition} which invokes a {@link Method}. The {@link Method} can<a name="line.33"></a>
<span class="sourceLineNo">034</span> * have zero or any number of StateContext and State regarding order<a name="line.34"></a>
<span class="sourceLineNo">035</span> * &lt;p&gt;<a name="line.35"></a>
<span class="sourceLineNo">036</span> * Normally you wouldn't create instances of this class directly but rather use<a name="line.36"></a>
<span class="sourceLineNo">037</span> * the {@link SelfTransition} annotation to define the methods which should be<a name="line.37"></a>
<span class="sourceLineNo">038</span> * used as transitions in your state machine and then let<a name="line.38"></a>
<span class="sourceLineNo">039</span> * {@link org.apache.mina.statemachine#StateMachineFactory} create a<a name="line.39"></a>
<span class="sourceLineNo">040</span> * {@link StateMachine} for you.<a name="line.40"></a>
<span class="sourceLineNo">041</span> * &lt;/p&gt;<a name="line.41"></a>
<span class="sourceLineNo">042</span> * <a name="line.42"></a>
<span class="sourceLineNo">043</span> * @author &lt;a href="http://mina.apache.org"&gt;Apache MINA Project&lt;/a&gt;<a name="line.43"></a>
<span class="sourceLineNo">044</span> */<a name="line.44"></a>
<span class="sourceLineNo">045</span>public class MethodSelfTransition extends AbstractSelfTransition {<a name="line.45"></a>
<span class="sourceLineNo">046</span> private static final Logger LOGGER = LoggerFactory.getLogger(MethodTransition.class);<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span> private Method method;<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span> private final Object target;<a name="line.50"></a>
<span class="sourceLineNo">051</span><a name="line.51"></a>
<span class="sourceLineNo">052</span> private static final Object[] EMPTY_ARGUMENTS = new Object[0];<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span> public MethodSelfTransition(Method method, Object target) {<a name="line.54"></a>
<span class="sourceLineNo">055</span> super();<a name="line.55"></a>
<span class="sourceLineNo">056</span> this.method = method;<a name="line.56"></a>
<span class="sourceLineNo">057</span> this.target = target;<a name="line.57"></a>
<span class="sourceLineNo">058</span> }<a name="line.58"></a>
<span class="sourceLineNo">059</span><a name="line.59"></a>
<span class="sourceLineNo">060</span> /**<a name="line.60"></a>
<span class="sourceLineNo">061</span> * Creates a new instance<a name="line.61"></a>
<span class="sourceLineNo">062</span> * <a name="line.62"></a>
<span class="sourceLineNo">063</span> * @param methodName<a name="line.63"></a>
<span class="sourceLineNo">064</span> * the target method.<a name="line.64"></a>
<span class="sourceLineNo">065</span> * @param target<a name="line.65"></a>
<span class="sourceLineNo">066</span> * the target object.<a name="line.66"></a>
<span class="sourceLineNo">067</span> */<a name="line.67"></a>
<span class="sourceLineNo">068</span> public MethodSelfTransition(String methodName, Object target) {<a name="line.68"></a>
<span class="sourceLineNo">069</span><a name="line.69"></a>
<span class="sourceLineNo">070</span> this.target = target;<a name="line.70"></a>
<span class="sourceLineNo">071</span><a name="line.71"></a>
<span class="sourceLineNo">072</span> Method[] candidates = target.getClass().getMethods();<a name="line.72"></a>
<span class="sourceLineNo">073</span> Method result = null;<a name="line.73"></a>
<span class="sourceLineNo">074</span><a name="line.74"></a>
<span class="sourceLineNo">075</span> for (int i = 0; i &lt; candidates.length; i++) {<a name="line.75"></a>
<span class="sourceLineNo">076</span> if (candidates[i].getName().equals(methodName)) {<a name="line.76"></a>
<span class="sourceLineNo">077</span> if (result != null) {<a name="line.77"></a>
<span class="sourceLineNo">078</span> throw new AmbiguousMethodException(methodName);<a name="line.78"></a>
<span class="sourceLineNo">079</span> }<a name="line.79"></a>
<span class="sourceLineNo">080</span> result = candidates[i];<a name="line.80"></a>
<span class="sourceLineNo">081</span> }<a name="line.81"></a>
<span class="sourceLineNo">082</span> }<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span> if (result == null) {<a name="line.84"></a>
<span class="sourceLineNo">085</span> throw new NoSuchMethodException(methodName);<a name="line.85"></a>
<span class="sourceLineNo">086</span> }<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span> this.method = result;<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span> }<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span> /**<a name="line.92"></a>
<span class="sourceLineNo">093</span> * Returns the target {@link Method}.<a name="line.93"></a>
<span class="sourceLineNo">094</span> * <a name="line.94"></a>
<span class="sourceLineNo">095</span> * @return the method.<a name="line.95"></a>
<span class="sourceLineNo">096</span> */<a name="line.96"></a>
<span class="sourceLineNo">097</span> public Method getMethod() {<a name="line.97"></a>
<span class="sourceLineNo">098</span> return method;<a name="line.98"></a>
<span class="sourceLineNo">099</span> }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span> public boolean doExecute(StateContext stateContext, State state) {<a name="line.101"></a>
<span class="sourceLineNo">102</span> Class&lt;?&gt;[] types = method.getParameterTypes();<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span> if (types.length == 0) {<a name="line.104"></a>
<span class="sourceLineNo">105</span> invokeMethod(EMPTY_ARGUMENTS);<a name="line.105"></a>
<span class="sourceLineNo">106</span> return true;<a name="line.106"></a>
<span class="sourceLineNo">107</span> }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span> if (types.length &gt; 2) {<a name="line.109"></a>
<span class="sourceLineNo">110</span> return false;<a name="line.110"></a>
<span class="sourceLineNo">111</span> }<a name="line.111"></a>
<span class="sourceLineNo">112</span><a name="line.112"></a>
<span class="sourceLineNo">113</span> Object[] args = new Object[types.length];<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span> int i = 0;<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span> if (types[i].isAssignableFrom(StateContext.class)) {<a name="line.117"></a>
<span class="sourceLineNo">118</span> args[i++] = stateContext;<a name="line.118"></a>
<span class="sourceLineNo">119</span> }<a name="line.119"></a>
<span class="sourceLineNo">120</span> if ((i &lt; types.length) &amp;&amp; types[i].isAssignableFrom(State.class)) {<a name="line.120"></a>
<span class="sourceLineNo">121</span> args[i++] = state;<a name="line.121"></a>
<span class="sourceLineNo">122</span> }<a name="line.122"></a>
<span class="sourceLineNo">123</span><a name="line.123"></a>
<span class="sourceLineNo">124</span> invokeMethod(args);<a name="line.124"></a>
<span class="sourceLineNo">125</span><a name="line.125"></a>
<span class="sourceLineNo">126</span> return true;<a name="line.126"></a>
<span class="sourceLineNo">127</span> }<a name="line.127"></a>
<span class="sourceLineNo">128</span><a name="line.128"></a>
<span class="sourceLineNo">129</span> private void invokeMethod(Object[] arguments) {<a name="line.129"></a>
<span class="sourceLineNo">130</span> try {<a name="line.130"></a>
<span class="sourceLineNo">131</span> if (LOGGER.isDebugEnabled()) {<a name="line.131"></a>
<span class="sourceLineNo">132</span> LOGGER.debug("Executing method " + method + " with arguments " + Arrays.asList(arguments));<a name="line.132"></a>
<span class="sourceLineNo">133</span> }<a name="line.133"></a>
<span class="sourceLineNo">134</span> method.invoke(target, arguments);<a name="line.134"></a>
<span class="sourceLineNo">135</span> } catch (InvocationTargetException ite) {<a name="line.135"></a>
<span class="sourceLineNo">136</span> if (ite.getCause() instanceof RuntimeException) {<a name="line.136"></a>
<span class="sourceLineNo">137</span> throw (RuntimeException) ite.getCause();<a name="line.137"></a>
<span class="sourceLineNo">138</span> }<a name="line.138"></a>
<span class="sourceLineNo">139</span> throw new MethodInvocationException(method, ite);<a name="line.139"></a>
<span class="sourceLineNo">140</span> } catch (IllegalAccessException iae) {<a name="line.140"></a>
<span class="sourceLineNo">141</span> throw new MethodInvocationException(method, iae);<a name="line.141"></a>
<span class="sourceLineNo">142</span> }<a name="line.142"></a>
<span class="sourceLineNo">143</span> }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span>}<a name="line.145"></a>
</pre>
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