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| <pre><span class="sourceLineNo">001</span><a id="line.1">/*</a> |
| <span class="sourceLineNo">002</span><a id="line.2"> * Licensed to the Apache Software Foundation (ASF) under one</a> |
| <span class="sourceLineNo">003</span><a id="line.3"> * or more contributor license agreements. See the NOTICE file</a> |
| <span class="sourceLineNo">004</span><a id="line.4"> * distributed with this work for additional information</a> |
| <span class="sourceLineNo">005</span><a id="line.5"> * regarding copyright ownership. The ASF licenses this file</a> |
| <span class="sourceLineNo">006</span><a id="line.6"> * to you under the Apache License, Version 2.0 (the</a> |
| <span class="sourceLineNo">007</span><a id="line.7"> * "License"); you may not use this file except in compliance</a> |
| <span class="sourceLineNo">008</span><a id="line.8"> * with the License. You may obtain a copy of the License at</a> |
| <span class="sourceLineNo">009</span><a id="line.9"> *</a> |
| <span class="sourceLineNo">010</span><a id="line.10"> * http://www.apache.org/licenses/LICENSE-2.0</a> |
| <span class="sourceLineNo">011</span><a id="line.11"> *</a> |
| <span class="sourceLineNo">012</span><a id="line.12"> * Unless required by applicable law or agreed to in writing,</a> |
| <span class="sourceLineNo">013</span><a id="line.13"> * software distributed under the License is distributed on an</a> |
| <span class="sourceLineNo">014</span><a id="line.14"> * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</a> |
| <span class="sourceLineNo">015</span><a id="line.15"> * KIND, either express or implied. See the License for the</a> |
| <span class="sourceLineNo">016</span><a id="line.16"> * specific language governing permissions and limitations</a> |
| <span class="sourceLineNo">017</span><a id="line.17"> * under the License.</a> |
| <span class="sourceLineNo">018</span><a id="line.18"> */</a> |
| <span class="sourceLineNo">019</span><a id="line.19">package org.apache.shiro.event.support;</a> |
| <span class="sourceLineNo">020</span><a id="line.20"></a> |
| <span class="sourceLineNo">021</span><a id="line.21">import java.util.Comparator;</a> |
| <span class="sourceLineNo">022</span><a id="line.22"></a> |
| <span class="sourceLineNo">023</span><a id="line.23">/**</a> |
| <span class="sourceLineNo">024</span><a id="line.24"> * Compares two event listeners to determine the order in which they should be invoked when an event is dispatched.</a> |
| <span class="sourceLineNo">025</span><a id="line.25"> * The lower the order, the sooner it will be invoked (the higher its precedence). The higher the order, the later</a> |
| <span class="sourceLineNo">026</span><a id="line.26"> * it will be invoked (the lower its precedence).</a> |
| <span class="sourceLineNo">027</span><a id="line.27"> * <p/></a> |
| <span class="sourceLineNo">028</span><a id="line.28"> * TypedEventListeners have a higher precedence (i.e. a lower order) than standard EventListener instances. Standard</a> |
| <span class="sourceLineNo">029</span><a id="line.29"> * EventListener instances have the same order priority.</a> |
| <span class="sourceLineNo">030</span><a id="line.30"> * <p/></a> |
| <span class="sourceLineNo">031</span><a id="line.31"> * When both objects being compared are TypedEventListeners, they are ordered according to the rules of the</a> |
| <span class="sourceLineNo">032</span><a id="line.32"> * {@link EventClassComparator}, using the TypedEventListeners'</a> |
| <span class="sourceLineNo">033</span><a id="line.33"> * {@link TypedEventListener#getEventType() eventType}.</a> |
| <span class="sourceLineNo">034</span><a id="line.34"> *</a> |
| <span class="sourceLineNo">035</span><a id="line.35"> * @since 1.3</a> |
| <span class="sourceLineNo">036</span><a id="line.36"> */</a> |
| <span class="sourceLineNo">037</span><a id="line.37">public class EventListenerComparator implements Comparator<EventListener> {</a> |
| <span class="sourceLineNo">038</span><a id="line.38"></a> |
| <span class="sourceLineNo">039</span><a id="line.39"> //event class comparator is stateless, so we can retain an instance:</a> |
| <span class="sourceLineNo">040</span><a id="line.40"> private static final EventClassComparator EVENT_CLASS_COMPARATOR = new EventClassComparator();</a> |
| <span class="sourceLineNo">041</span><a id="line.41"></a> |
| <span class="sourceLineNo">042</span><a id="line.42"> public int compare(EventListener a, EventListener b) {</a> |
| <span class="sourceLineNo">043</span><a id="line.43"> if (a == null) {</a> |
| <span class="sourceLineNo">044</span><a id="line.44"> if (b == null) {</a> |
| <span class="sourceLineNo">045</span><a id="line.45"> return 0;</a> |
| <span class="sourceLineNo">046</span><a id="line.46"> } else {</a> |
| <span class="sourceLineNo">047</span><a id="line.47"> return -1;</a> |
| <span class="sourceLineNo">048</span><a id="line.48"> }</a> |
| <span class="sourceLineNo">049</span><a id="line.49"> } else if (b == null) {</a> |
| <span class="sourceLineNo">050</span><a id="line.50"> return 1;</a> |
| <span class="sourceLineNo">051</span><a id="line.51"> } else if (a == b || a.equals(b)) {</a> |
| <span class="sourceLineNo">052</span><a id="line.52"> return 0;</a> |
| <span class="sourceLineNo">053</span><a id="line.53"> } else {</a> |
| <span class="sourceLineNo">054</span><a id="line.54"> if (a instanceof TypedEventListener) {</a> |
| <span class="sourceLineNo">055</span><a id="line.55"> TypedEventListener ta = (TypedEventListener)a;</a> |
| <span class="sourceLineNo">056</span><a id="line.56"> if (b instanceof TypedEventListener) {</a> |
| <span class="sourceLineNo">057</span><a id="line.57"> TypedEventListener tb = (TypedEventListener)b;</a> |
| <span class="sourceLineNo">058</span><a id="line.58"> return EVENT_CLASS_COMPARATOR.compare(ta.getEventType(), tb.getEventType());</a> |
| <span class="sourceLineNo">059</span><a id="line.59"> } else {</a> |
| <span class="sourceLineNo">060</span><a id="line.60"> return -1; //TypedEventListeners are 'less than' (higher priority) than non typed</a> |
| <span class="sourceLineNo">061</span><a id="line.61"> }</a> |
| <span class="sourceLineNo">062</span><a id="line.62"> } else {</a> |
| <span class="sourceLineNo">063</span><a id="line.63"> if (b instanceof TypedEventListener) {</a> |
| <span class="sourceLineNo">064</span><a id="line.64"> return 1;</a> |
| <span class="sourceLineNo">065</span><a id="line.65"> } else {</a> |
| <span class="sourceLineNo">066</span><a id="line.66"> return 0;</a> |
| <span class="sourceLineNo">067</span><a id="line.67"> }</a> |
| <span class="sourceLineNo">068</span><a id="line.68"> }</a> |
| <span class="sourceLineNo">069</span><a id="line.69"> }</a> |
| <span class="sourceLineNo">070</span><a id="line.70"> }</a> |
| <span class="sourceLineNo">071</span><a id="line.71">}</a> |
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| </pre> |
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