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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 java.lang.reflect.Field;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.lang.reflect.Modifier;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.util.Collection;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import java.util.LinkedHashMap;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import java.util.Map;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span><a name="line.27"></a> |
| <span class="sourceLineNo">028</span>/**<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>* Fluent API to retrieve fields of a given type.<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>*/<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>public class Fields<T> {<a name="line.31"></a> |
| <span class="sourceLineNo">032</span><a name="line.32"></a> |
| <span class="sourceLineNo">033</span> private Class<? extends T> type;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> private Class<?> clazz;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> private Object object;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> private Map<String, Field> fields;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span><a name="line.37"></a> |
| <span class="sourceLineNo">038</span> public Collection<T> get() {<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> return map().values();<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> }<a name="line.40"></a> |
| <span class="sourceLineNo">041</span><a name="line.41"></a> |
| <span class="sourceLineNo">042</span> public Map<Field, T> map(Object o) {<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> this.object = o;<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> return map();<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> public Map<Field, T> map() {<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> Collection<Field> set = retrieve();<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> Map<Field, T> results = new LinkedHashMap<Field, T>();<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> for (Field field : set) {<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> if (!field.isAccessible()) {<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> field.setAccessible(true);<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> }<a name="line.53"></a> |
| <span class="sourceLineNo">054</span><a name="line.54"></a> |
| <span class="sourceLineNo">055</span> try {<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> results.put(field, (T) field.get(object));<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> } catch (IllegalAccessException e) {<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> // Hopefully should not happen.<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> return results;<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> }<a name="line.62"></a> |
| <span class="sourceLineNo">063</span><a name="line.63"></a> |
| <span class="sourceLineNo">064</span> public Collection<T> get(Object o) {<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> this.object = o;<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> return get();<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> }<a name="line.67"></a> |
| <span class="sourceLineNo">068</span><a name="line.68"></a> |
| <span class="sourceLineNo">069</span> public Fields ofType(Class<? extends T> clazz) {<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> this.type = clazz;<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> return this;<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> public Fields in(Object o) {<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> this.object = o;<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> this.clazz = o.getClass();<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> return this;<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> public Fields in(Class<?> c) {<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> this.clazz = c;<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> return this;<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> }<a name="line.83"></a> |
| <span class="sourceLineNo">084</span><a name="line.84"></a> |
| <span class="sourceLineNo">085</span> private Collection<Field> retrieve() {<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> if (fields != null) {<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> return fields.values();<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> if (clazz == null) {<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> throw new NullPointerException("Cannot retrieve field, class not set");<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> }<a name="line.92"></a> |
| <span class="sourceLineNo">093</span><a name="line.93"></a> |
| <span class="sourceLineNo">094</span><a name="line.94"></a> |
| <span class="sourceLineNo">095</span> fields = new LinkedHashMap<String, Field>();<a name="line.95"></a> |
| <span class="sourceLineNo">096</span><a name="line.96"></a> |
| <span class="sourceLineNo">097</span> // First the class itself<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> Field[] list = clazz.getDeclaredFields();<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> for (Field field : list) {<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> if (type == null || type.isAssignableFrom(field.getType())) {<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> fields.put(field.getName(), field);<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> }<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> }<a name="line.103"></a> |
| <span class="sourceLineNo">104</span><a name="line.104"></a> |
| <span class="sourceLineNo">105</span> // Traverse class hierarchy<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> if (clazz.getSuperclass() != null) {<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> traverse(fields, clazz.getSuperclass());<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> }<a name="line.108"></a> |
| <span class="sourceLineNo">109</span><a name="line.109"></a> |
| <span class="sourceLineNo">110</span> return fields.values();<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> private void traverse(Map<String, Field> fields, Class<?> clazz) {<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> // First the given class<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> Field[] list = clazz.getDeclaredFields();<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> for (Field field : list) {<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> if (type == null || type.isAssignableFrom(field.getType())) {<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> // Already defined by a daughter class<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> if (!fields.containsKey(field.getName())) {<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> // Check visibility if must be either public or protected.<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> if (Modifier.isPublic(field.getModifiers()) || Modifier.isProtected(field.getModifiers())) {<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> fields.put(field.getName(), field);<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> }<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> }<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> }<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> }<a name="line.126"></a> |
| <span class="sourceLineNo">127</span><a name="line.127"></a> |
| <span class="sourceLineNo">128</span> // If we have a parent class, traverse it<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> if (clazz.getSuperclass() != null) {<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> traverse(fields, clazz.getSuperclass());<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> }<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> }<a name="line.132"></a> |
| <span class="sourceLineNo">133</span><a name="line.133"></a> |
| <span class="sourceLineNo">134</span>}<a name="line.134"></a> |
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| </pre> |
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