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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.manipulator.spi.helper;<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.manipulator.spi.BindingContext;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.felix.ipojo.manipulator.spi.Predicate;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.objectweb.asm.tree.ClassNode;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.objectweb.asm.tree.FieldNode;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.objectweb.asm.tree.MethodNode;<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.lang.annotation.Annotation;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.lang.annotation.ElementType;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.lang.annotation.Target;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.Arrays;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.Collection;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.util.HashSet;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.util.regex.Pattern;<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>/**<a name="line.36"></a>
<span class="sourceLineNo">037</span> * Ready-to-use {@link Predicate} implementations.<a name="line.37"></a>
<span class="sourceLineNo">038</span> * @author &lt;a href="mailto:dev@felix.apache.org"&gt;Felix Project Team&lt;/a&gt;<a name="line.38"></a>
<span class="sourceLineNo">039</span> */<a name="line.39"></a>
<span class="sourceLineNo">040</span>public class Predicates {<a name="line.40"></a>
<span class="sourceLineNo">041</span> public static Node node() {<a name="line.41"></a>
<span class="sourceLineNo">042</span> return new Node();<a name="line.42"></a>
<span class="sourceLineNo">043</span> }<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span> public static Reference reference(String refId) {<a name="line.45"></a>
<span class="sourceLineNo">046</span> return new Reference(refId);<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> public static Matcher pattern(String regex) {<a name="line.49"></a>
<span class="sourceLineNo">050</span> return new Matcher(regex);<a name="line.50"></a>
<span class="sourceLineNo">051</span> }<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span> /**<a name="line.53"></a>
<span class="sourceLineNo">054</span> * Restrict to the given {@link ElementType}.<a name="line.54"></a>
<span class="sourceLineNo">055</span> * @param type expected {@link ElementType}<a name="line.55"></a>
<span class="sourceLineNo">056</span> */<a name="line.56"></a>
<span class="sourceLineNo">057</span> public static Predicate on(final ElementType type) {<a name="line.57"></a>
<span class="sourceLineNo">058</span> return new Predicate() {<a name="line.58"></a>
<span class="sourceLineNo">059</span> public boolean matches(BindingContext context) {<a name="line.59"></a>
<span class="sourceLineNo">060</span> return context.getElementType().equals(type);<a name="line.60"></a>
<span class="sourceLineNo">061</span> }<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><a name="line.64"></a>
<span class="sourceLineNo">065</span> /**<a name="line.65"></a>
<span class="sourceLineNo">066</span> * Always return {@literal true}.<a name="line.66"></a>
<span class="sourceLineNo">067</span> */<a name="line.67"></a>
<span class="sourceLineNo">068</span> public static Predicate alwaysTrue() {<a name="line.68"></a>
<span class="sourceLineNo">069</span> return new Predicate() {<a name="line.69"></a>
<span class="sourceLineNo">070</span> public boolean matches(BindingContext context) {<a name="line.70"></a>
<span class="sourceLineNo">071</span> return true;<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>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span> /**<a name="line.76"></a>
<span class="sourceLineNo">077</span> * Successful if all given predicates are satisfied.<a name="line.77"></a>
<span class="sourceLineNo">078</span> * @param predicates predicates to be satisfied<a name="line.78"></a>
<span class="sourceLineNo">079</span> */<a name="line.79"></a>
<span class="sourceLineNo">080</span> public static Predicate and(final Predicate... predicates) {<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>
<span class="sourceLineNo">082</span> // Optimization<a name="line.82"></a>
<span class="sourceLineNo">083</span> if (predicates.length == 1) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> return predicates[0];<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> return new Predicate() {<a name="line.87"></a>
<span class="sourceLineNo">088</span> public boolean matches(BindingContext context) {<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span> for (Predicate predicate : predicates) {<a name="line.90"></a>
<span class="sourceLineNo">091</span> // Quit with first failure<a name="line.91"></a>
<span class="sourceLineNo">092</span> if (!predicate.matches(context)) {<a name="line.92"></a>
<span class="sourceLineNo">093</span> return false;<a name="line.93"></a>
<span class="sourceLineNo">094</span> }<a name="line.94"></a>
<span class="sourceLineNo">095</span> }<a name="line.95"></a>
<span class="sourceLineNo">096</span> return true;<a name="line.96"></a>
<span class="sourceLineNo">097</span> }<a name="line.97"></a>
<span class="sourceLineNo">098</span> };<a name="line.98"></a>
<span class="sourceLineNo">099</span> }<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> * Successful if at least one of the given predicates is satisfied.<a name="line.102"></a>
<span class="sourceLineNo">103</span> * @param predicates predicates to be satisfied (at least one)<a name="line.103"></a>
<span class="sourceLineNo">104</span> */<a name="line.104"></a>
<span class="sourceLineNo">105</span> public static Predicate or(final Collection&lt;Predicate&gt; predicates) {<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span> // Optimization<a name="line.107"></a>
<span class="sourceLineNo">108</span> if (predicates.size() == 1) {<a name="line.108"></a>
<span class="sourceLineNo">109</span> return predicates.iterator().next();<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> return new Predicate() {<a name="line.112"></a>
<span class="sourceLineNo">113</span> public boolean matches(BindingContext context) {<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span> for (Predicate predicate : predicates) {<a name="line.115"></a>
<span class="sourceLineNo">116</span> // Quit with first success<a name="line.116"></a>
<span class="sourceLineNo">117</span> if (predicate.matches(context)) {<a name="line.117"></a>
<span class="sourceLineNo">118</span> return true;<a name="line.118"></a>
<span class="sourceLineNo">119</span> }<a name="line.119"></a>
<span class="sourceLineNo">120</span> }<a name="line.120"></a>
<span class="sourceLineNo">121</span> // No predicate were matching<a name="line.121"></a>
<span class="sourceLineNo">122</span> return false;<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> * Successful if at least one of the given predicates is satisfied.<a name="line.128"></a>
<span class="sourceLineNo">129</span> * @param predicates predicates to be satisfied (at least one)<a name="line.129"></a>
<span class="sourceLineNo">130</span> */<a name="line.130"></a>
<span class="sourceLineNo">131</span> public static Predicate or(final Predicate... predicates) {<a name="line.131"></a>
<span class="sourceLineNo">132</span> return or(Arrays.asList(predicates));<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>
<span class="sourceLineNo">135</span> /**<a name="line.135"></a>
<span class="sourceLineNo">136</span> * Restrict to the supported {@link ElementType}(s) of the annotation (use the @Target, if provided).<a name="line.136"></a>
<span class="sourceLineNo">137</span> * @param annotationType annotation to explore<a name="line.137"></a>
<span class="sourceLineNo">138</span> */<a name="line.138"></a>
<span class="sourceLineNo">139</span> public static Predicate onlySupportedElements(final Class&lt;? extends Annotation&gt; annotationType) {<a name="line.139"></a>
<span class="sourceLineNo">140</span> Target target = annotationType.getAnnotation(Target.class);<a name="line.140"></a>
<span class="sourceLineNo">141</span> if (target == null) {<a name="line.141"></a>
<span class="sourceLineNo">142</span> return alwaysTrue();<a name="line.142"></a>
<span class="sourceLineNo">143</span> }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span> Collection&lt;Predicate&gt; supportedTypes = new HashSet&lt;Predicate&gt;();<a name="line.145"></a>
<span class="sourceLineNo">146</span> for (ElementType type : target.value()) {<a name="line.146"></a>
<span class="sourceLineNo">147</span> supportedTypes.add(on(type));<a name="line.147"></a>
<span class="sourceLineNo">148</span> }<a name="line.148"></a>
<span class="sourceLineNo">149</span><a name="line.149"></a>
<span class="sourceLineNo">150</span> return or(supportedTypes);<a name="line.150"></a>
<span class="sourceLineNo">151</span> }<a name="line.151"></a>
<span class="sourceLineNo">152</span><a name="line.152"></a>
<span class="sourceLineNo">153</span> public static class Reference {<a name="line.153"></a>
<span class="sourceLineNo">154</span><a name="line.154"></a>
<span class="sourceLineNo">155</span> private String refId;<a name="line.155"></a>
<span class="sourceLineNo">156</span><a name="line.156"></a>
<span class="sourceLineNo">157</span> public Reference(String refId) {<a name="line.157"></a>
<span class="sourceLineNo">158</span> this.refId = refId;<a name="line.158"></a>
<span class="sourceLineNo">159</span> }<a name="line.159"></a>
<span class="sourceLineNo">160</span><a name="line.160"></a>
<span class="sourceLineNo">161</span> /**<a name="line.161"></a>
<span class="sourceLineNo">162</span> * Restrict execution if the {@link org.apache.felix.ipojo.manipulator.metadata.annotation.ComponentWorkbench}<a name="line.162"></a>
<span class="sourceLineNo">163</span> * contains the given reference's name.<a name="line.163"></a>
<span class="sourceLineNo">164</span> */<a name="line.164"></a>
<span class="sourceLineNo">165</span> public Predicate exists() {<a name="line.165"></a>
<span class="sourceLineNo">166</span> return new Predicate() {<a name="line.166"></a>
<span class="sourceLineNo">167</span> public boolean matches(BindingContext context) {<a name="line.167"></a>
<span class="sourceLineNo">168</span> return context.getWorkbench().getIds().containsKey(refId);<a name="line.168"></a>
<span class="sourceLineNo">169</span> }<a name="line.169"></a>
<span class="sourceLineNo">170</span> };<a name="line.170"></a>
<span class="sourceLineNo">171</span> }<a name="line.171"></a>
<span class="sourceLineNo">172</span> }<a name="line.172"></a>
<span class="sourceLineNo">173</span><a name="line.173"></a>
<span class="sourceLineNo">174</span> public static class Matcher {<a name="line.174"></a>
<span class="sourceLineNo">175</span><a name="line.175"></a>
<span class="sourceLineNo">176</span> private Pattern pattern;<a name="line.176"></a>
<span class="sourceLineNo">177</span><a name="line.177"></a>
<span class="sourceLineNo">178</span> public Matcher(String regex) {<a name="line.178"></a>
<span class="sourceLineNo">179</span> pattern = Pattern.compile(regex);<a name="line.179"></a>
<span class="sourceLineNo">180</span> }<a name="line.180"></a>
<span class="sourceLineNo">181</span><a name="line.181"></a>
<span class="sourceLineNo">182</span> /**<a name="line.182"></a>
<span class="sourceLineNo">183</span> * Restrict execution if the annotation's classname matches the given pattern.<a name="line.183"></a>
<span class="sourceLineNo">184</span> */<a name="line.184"></a>
<span class="sourceLineNo">185</span> public Predicate matches() {<a name="line.185"></a>
<span class="sourceLineNo">186</span> return new Predicate() {<a name="line.186"></a>
<span class="sourceLineNo">187</span> public boolean matches(BindingContext context) {<a name="line.187"></a>
<span class="sourceLineNo">188</span> return pattern.matcher(context.getAnnotationType().getClassName()).matches();<a name="line.188"></a>
<span class="sourceLineNo">189</span> }<a name="line.189"></a>
<span class="sourceLineNo">190</span> };<a name="line.190"></a>
<span class="sourceLineNo">191</span> }<a name="line.191"></a>
<span class="sourceLineNo">192</span> }<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span> public static class Node {<a name="line.194"></a>
<span class="sourceLineNo">195</span> /**<a name="line.195"></a>
<span class="sourceLineNo">196</span> * Restrict execution if the supported {@literal Node} has the given name.<a name="line.196"></a>
<span class="sourceLineNo">197</span> */<a name="line.197"></a>
<span class="sourceLineNo">198</span> public Predicate named(final String expected) {<a name="line.198"></a>
<span class="sourceLineNo">199</span> return new Predicate() {<a name="line.199"></a>
<span class="sourceLineNo">200</span> public boolean matches(BindingContext context) {<a name="line.200"></a>
<span class="sourceLineNo">201</span> if (context.getFieldNode() != null) {<a name="line.201"></a>
<span class="sourceLineNo">202</span> FieldNode field = context.getFieldNode();<a name="line.202"></a>
<span class="sourceLineNo">203</span> return field.name.equals(expected);<a name="line.203"></a>
<span class="sourceLineNo">204</span> }<a name="line.204"></a>
<span class="sourceLineNo">205</span><a name="line.205"></a>
<span class="sourceLineNo">206</span> if (context.getMethodNode() != null) {<a name="line.206"></a>
<span class="sourceLineNo">207</span> MethodNode method = context.getMethodNode();<a name="line.207"></a>
<span class="sourceLineNo">208</span> return method.name.equals(expected);<a name="line.208"></a>
<span class="sourceLineNo">209</span> }<a name="line.209"></a>
<span class="sourceLineNo">210</span><a name="line.210"></a>
<span class="sourceLineNo">211</span> if (context.getClassNode() != null) {<a name="line.211"></a>
<span class="sourceLineNo">212</span> ClassNode clazz = context.getClassNode();<a name="line.212"></a>
<span class="sourceLineNo">213</span> return clazz.name.equals(expected);<a name="line.213"></a>
<span class="sourceLineNo">214</span> }<a name="line.214"></a>
<span class="sourceLineNo">215</span><a name="line.215"></a>
<span class="sourceLineNo">216</span> // Parameters have no name in bytecode<a name="line.216"></a>
<span class="sourceLineNo">217</span><a name="line.217"></a>
<span class="sourceLineNo">218</span> return false;<a name="line.218"></a>
<span class="sourceLineNo">219</span> }<a name="line.219"></a>
<span class="sourceLineNo">220</span> };<a name="line.220"></a>
<span class="sourceLineNo">221</span> }<a name="line.221"></a>
<span class="sourceLineNo">222</span> }<a name="line.222"></a>
<span class="sourceLineNo">223</span><a name="line.223"></a>
<span class="sourceLineNo">224</span>}<a name="line.224"></a>
</pre>
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