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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 java.util.Comparator;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span><a name="line.22"></a> |
| <span class="sourceLineNo">023</span>/**<a name="line.23"></a> |
| <span class="sourceLineNo">024</span> * Compares two event classes based on their position in a class hierarchy. Classes higher up in a hierarchy are<a name="line.24"></a> |
| <span class="sourceLineNo">025</span> * 'greater than' (ordered later) than classes lower in a hierarchy (ordered earlier). Classes in unrelated<a name="line.25"></a> |
| <span class="sourceLineNo">026</span> * hierarchies have the same order priority.<a name="line.26"></a> |
| <span class="sourceLineNo">027</span> * <p/><a name="line.27"></a> |
| <span class="sourceLineNo">028</span> * Event bus implementations use this comparator to determine which event listener method to invoke when polymorphic<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * listener methods are defined:<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * <p/><a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * If two event classes exist A and B, where A is the parent class of B (and B is a subclass of A) and an event<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> * subscriber listens to both events:<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * <pre><a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * &#64;Subscribe<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> * public void onEvent(A a) { ... }<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> *<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * &#64;Subscribe<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * public void onEvent(B b) { ... }<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> * </pre><a name="line.39"></a> |
| <span class="sourceLineNo">040</span> *<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * The {@code onEvent(B b)} method will be invoked on the subscriber and the<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * {@code onEvent(A a)} method will <em>not</em> be invoked. This is to prevent multiple dispatching of a single event<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * to the same consumer.<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * <p/><a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * The EventClassComparator is used to order listener method priority based on their event argument class - methods<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> * handling event subclasses have higher precedence than superclasses.<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> *<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> * @since 1.3<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> */<a name="line.49"></a> |
| <span class="sourceLineNo">050</span>public class EventClassComparator implements Comparator<Class> {<a name="line.50"></a> |
| <span class="sourceLineNo">051</span><a name="line.51"></a> |
| <span class="sourceLineNo">052</span> @SuppressWarnings("unchecked")<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> public int compare(Class a, Class b) {<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> if (a == null) {<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> if (b == null) {<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> return 0;<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> } else {<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> return -1;<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> }<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> } else if (b == null) {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> return 1;<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> } else if (a == b || a.equals(b)) {<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> return 0;<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> } else {<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> if (a.isAssignableFrom(b)) {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> return 1;<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> } else if (b.isAssignableFrom(a)) {<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> return -1;<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> } else {<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> return 0;<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> }<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> }<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> |
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