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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>package org.apache.shiro.event.support;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import org.apache.shiro.event.Subscribe;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import org.apache.shiro.util.ClassUtils;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span><a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.lang.annotation.Annotation;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import java.lang.reflect.Method;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import java.util.ArrayList;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import java.util.Collections;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import java.util.List;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span><a name="line.29"></a> |
| <span class="sourceLineNo">030</span>/**<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * Inspects an object for annotated methods of interest and creates an {@link EventListener} instance for each method<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> * discovered. An event bus will call the resulting listeners as relevant events arrive.<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * <p/><a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * The default {@link #setAnnotationClass(Class) annotationClass} is {@link Subscribe}, indicating each<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * {@link Subscribe}-annotated method will be represented as an EventListener.<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> *<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * @see SingleArgumentMethodEventListener<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * @since 1.3<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> */<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>public class AnnotationEventListenerResolver implements EventListenerResolver {<a name="line.40"></a> |
| <span class="sourceLineNo">041</span><a name="line.41"></a> |
| <span class="sourceLineNo">042</span> private Class<? extends Annotation> annotationClass;<a name="line.42"></a> |
| <span class="sourceLineNo">043</span><a name="line.43"></a> |
| <span class="sourceLineNo">044</span> public AnnotationEventListenerResolver() {<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> this.annotationClass = Subscribe.class;<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> }<a name="line.46"></a> |
| <span class="sourceLineNo">047</span><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> /**<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> * Returns a new collection of {@link EventListener} instances, each instance corresponding to an annotated<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> * method discovered on the specified {@code instance} argument.<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> *<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * @param instance the instance to inspect for annotated event handler methods.<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> * @return a new collection of {@link EventListener} instances, each instance corresponding to an annotated<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * method discovered on the specified {@code instance} argument.<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> */<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> public List<EventListener> getEventListeners(Object instance) {<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> if (instance == null) {<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> return Collections.emptyList();<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> List<Method> methods = ClassUtils.getAnnotatedMethods(instance.getClass(), getAnnotationClass());<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> if (methods == null || methods.isEmpty()) {<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> return Collections.emptyList();<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> }<a name="line.64"></a> |
| <span class="sourceLineNo">065</span><a name="line.65"></a> |
| <span class="sourceLineNo">066</span> List<EventListener> listeners = new ArrayList<EventListener>(methods.size());<a name="line.66"></a> |
| <span class="sourceLineNo">067</span><a name="line.67"></a> |
| <span class="sourceLineNo">068</span> for (Method m : methods) {<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> listeners.add(new SingleArgumentMethodEventListener(instance, m));<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> }<a name="line.70"></a> |
| <span class="sourceLineNo">071</span><a name="line.71"></a> |
| <span class="sourceLineNo">072</span> return listeners;<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> }<a name="line.73"></a> |
| <span class="sourceLineNo">074</span><a name="line.74"></a> |
| <span class="sourceLineNo">075</span> /**<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> * Returns the type of annotation that indicates a method that should be represented as an {@link EventListener},<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> * defaults to {@link Subscribe}.<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> *<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> * @return the type of annotation that indicates a method that should be represented as an {@link EventListener},<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> * defaults to {@link Subscribe}.<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> */<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> public Class<? extends Annotation> getAnnotationClass() {<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> return annotationClass;<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> }<a name="line.84"></a> |
| <span class="sourceLineNo">085</span><a name="line.85"></a> |
| <span class="sourceLineNo">086</span> /**<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> * Sets the type of annotation that indicates a method that should be represented as an {@link EventListener}.<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> * The default value is {@link Subscribe}.<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> *<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> * @param annotationClass the type of annotation that indicates a method that should be represented as an<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> * {@link EventListener}. The default value is {@link Subscribe}.<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> */<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> public void setAnnotationClass(Class<? extends Annotation> annotationClass) {<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> this.annotationClass = annotationClass;<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> }<a name="line.95"></a> |
| <span class="sourceLineNo">096</span>}<a name="line.96"></a> |
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