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apache / felix-site-pub / ce5028da261c6ed2e1928e6338c81e1f24559823 / . / ipojo / api / 1.11.2 / src-html / org / apache / felix / ipojo / util / InstanceConfigurationSource.html
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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.felix.ipojo.util;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.apache.felix.ipojo.ContextListener;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.felix.ipojo.ContextSource;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.*;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>/**<a name="line.27"></a>
<span class="sourceLineNo">028</span> * A context source giving access to system properties.<a name="line.28"></a>
<span class="sourceLineNo">029</span> */<a name="line.29"></a>
<span class="sourceLineNo">030</span>public class InstanceConfigurationSource implements ContextSource {<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> * The instance configuration.<a name="line.33"></a>
<span class="sourceLineNo">034</span> */<a name="line.34"></a>
<span class="sourceLineNo">035</span> private Dictionary&lt;String,Object&gt; m_configuration;<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span> /**<a name="line.37"></a>
<span class="sourceLineNo">038</span> * Listener list.<a name="line.38"></a>
<span class="sourceLineNo">039</span> */<a name="line.39"></a>
<span class="sourceLineNo">040</span> private List&lt;ContextListener&gt; m_listeners = new ArrayList&lt;ContextListener&gt;();<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span> public InstanceConfigurationSource(Dictionary&lt;String, Object&gt; configuration) {<a name="line.42"></a>
<span class="sourceLineNo">043</span> m_configuration = configuration;<a name="line.43"></a>
<span class="sourceLineNo">044</span> }<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span> /**<a name="line.46"></a>
<span class="sourceLineNo">047</span> * The instance is reconfigured.<a name="line.47"></a>
<span class="sourceLineNo">048</span> * Changes are computed by comparing the old and new configuration.<a name="line.48"></a>
<span class="sourceLineNo">049</span> * @param newConfiguration the new instance configuration<a name="line.49"></a>
<span class="sourceLineNo">050</span> */<a name="line.50"></a>
<span class="sourceLineNo">051</span> public void reconfigure(Dictionary&lt;String, Object&gt; newConfiguration) {<a name="line.51"></a>
<span class="sourceLineNo">052</span> // Copy the current configuration and update the field.<a name="line.52"></a>
<span class="sourceLineNo">053</span> Hashtable&lt;String, Object&gt; configuration = new Hashtable&lt;String, Object&gt;();<a name="line.53"></a>
<span class="sourceLineNo">054</span> Enumeration&lt;String&gt; enumeration = m_configuration.keys();<a name="line.54"></a>
<span class="sourceLineNo">055</span> while (enumeration.hasMoreElements()) {<a name="line.55"></a>
<span class="sourceLineNo">056</span> final String key = enumeration.nextElement();<a name="line.56"></a>
<span class="sourceLineNo">057</span> configuration.put(key, m_configuration.get(key));<a name="line.57"></a>
<span class="sourceLineNo">058</span> }<a name="line.58"></a>
<span class="sourceLineNo">059</span> // We now have a copy of the current configuration.<a name="line.59"></a>
<span class="sourceLineNo">060</span> // We must set the field to the new configuration, as updates are going to be fired.<a name="line.60"></a>
<span class="sourceLineNo">061</span> // so we must have reflected the updates already.<a name="line.61"></a>
<span class="sourceLineNo">062</span> m_configuration = newConfiguration;<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span> // We use the same loop to find lost and updated properties.<a name="line.64"></a>
<span class="sourceLineNo">065</span> enumeration = configuration.keys();<a name="line.65"></a>
<span class="sourceLineNo">066</span> while (enumeration.hasMoreElements()) {<a name="line.66"></a>
<span class="sourceLineNo">067</span> final String key = enumeration.nextElement();<a name="line.67"></a>
<span class="sourceLineNo">068</span> final Object newValue = newConfiguration.get(key);<a name="line.68"></a>
<span class="sourceLineNo">069</span> final Object oldValue = configuration.get(key);<a name="line.69"></a>
<span class="sourceLineNo">070</span> if (newValue == null) {<a name="line.70"></a>
<span class="sourceLineNo">071</span> // If we don't have the property anymore, notify the departure.<a name="line.71"></a>
<span class="sourceLineNo">072</span> fireUpdate(key, null);<a name="line.72"></a>
<span class="sourceLineNo">073</span> } else {<a name="line.73"></a>
<span class="sourceLineNo">074</span> // The new configuration still has a value, is it the same ?<a name="line.74"></a>
<span class="sourceLineNo">075</span> if (! newValue.equals(oldValue)) {<a name="line.75"></a>
<span class="sourceLineNo">076</span> fireUpdate(key, newValue);<a name="line.76"></a>
<span class="sourceLineNo">077</span> }<a name="line.77"></a>
<span class="sourceLineNo">078</span> }<a name="line.78"></a>
<span class="sourceLineNo">079</span> }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span> // Do we have new properties ?<a name="line.81"></a>
<span class="sourceLineNo">082</span> enumeration = newConfiguration.keys();<a name="line.82"></a>
<span class="sourceLineNo">083</span> while (enumeration.hasMoreElements()) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> final String key = enumeration.nextElement();<a name="line.84"></a>
<span class="sourceLineNo">085</span> if (configuration.get(key) == null) {<a name="line.85"></a>
<span class="sourceLineNo">086</span> Object newValue = newConfiguration.get(key);<a name="line.86"></a>
<span class="sourceLineNo">087</span> fireUpdate(key, newValue);<a name="line.87"></a>
<span class="sourceLineNo">088</span> }<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> private void fireUpdate(String key, Object newValue) {<a name="line.92"></a>
<span class="sourceLineNo">093</span> for (ContextListener listener : m_listeners) {<a name="line.93"></a>
<span class="sourceLineNo">094</span> listener.update(this, key, newValue);<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>
<span class="sourceLineNo">097</span><a name="line.97"></a>
<span class="sourceLineNo">098</span> public Object getProperty(String property) {<a name="line.98"></a>
<span class="sourceLineNo">099</span> return m_configuration.get(property);<a name="line.99"></a>
<span class="sourceLineNo">100</span> }<a name="line.100"></a>
<span class="sourceLineNo">101</span><a name="line.101"></a>
<span class="sourceLineNo">102</span> public Dictionary getContext() {<a name="line.102"></a>
<span class="sourceLineNo">103</span> return m_configuration;<a name="line.103"></a>
<span class="sourceLineNo">104</span> }<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span> public void registerContextListener(ContextListener listener, String[] properties) {<a name="line.106"></a>
<span class="sourceLineNo">107</span> if (! m_listeners.contains(listener)) {<a name="line.107"></a>
<span class="sourceLineNo">108</span> m_listeners.add(listener);<a name="line.108"></a>
<span class="sourceLineNo">109</span> }<a name="line.109"></a>
<span class="sourceLineNo">110</span> }<a name="line.110"></a>
<span class="sourceLineNo">111</span><a name="line.111"></a>
<span class="sourceLineNo">112</span> public void unregisterContextListener(ContextListener listener) {<a name="line.112"></a>
<span class="sourceLineNo">113</span> m_listeners.remove(listener);<a name="line.113"></a>
<span class="sourceLineNo">114</span> }<a name="line.114"></a>
<span class="sourceLineNo">115</span>}<a name="line.115"></a>
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