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apache / logging-log4j-site / 9755b12b39efbc0142688f9b1a11ec68db89f97b / . / 2.13.2 / log4j-core / apidocs / src-html / org / apache / logging / log4j / core / config / plugins / visitors / PluginElementVisitor.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 or more<a name="line.2"></a>
<span class="sourceLineNo">003</span> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a>
<span class="sourceLineNo">004</span> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<span class="sourceLineNo">005</span> * The ASF licenses this file to You under the Apache license, Version 2.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<span class="sourceLineNo">007</span> * the License. You may obtain a copy of the License at<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<span class="sourceLineNo">014</span> * See the license for the specific language governing permissions and<a name="line.14"></a>
<span class="sourceLineNo">015</span> * limitations under the license.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>package org.apache.logging.log4j.core.config.plugins.visitors;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.lang.reflect.Array;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.ArrayList;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.Arrays;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Collection;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.List;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.logging.log4j.core.LogEvent;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.logging.log4j.core.config.Configuration;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.logging.log4j.core.config.Node;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.logging.log4j.core.config.plugins.PluginElement;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.logging.log4j.core.config.plugins.util.PluginType;<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> * PluginVisitor implementation for {@link PluginElement}. Supports arrays as well as singular values.<a name="line.33"></a>
<span class="sourceLineNo">034</span> */<a name="line.34"></a>
<span class="sourceLineNo">035</span>public class PluginElementVisitor extends AbstractPluginVisitor&lt;PluginElement&gt; {<a name="line.35"></a>
<span class="sourceLineNo">036</span> public PluginElementVisitor() {<a name="line.36"></a>
<span class="sourceLineNo">037</span> super(PluginElement.class);<a name="line.37"></a>
<span class="sourceLineNo">038</span> }<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span> @Override<a name="line.40"></a>
<span class="sourceLineNo">041</span> public Object visit(final Configuration configuration, final Node node, final LogEvent event,<a name="line.41"></a>
<span class="sourceLineNo">042</span> final StringBuilder log) {<a name="line.42"></a>
<span class="sourceLineNo">043</span> final String name = this.annotation.value();<a name="line.43"></a>
<span class="sourceLineNo">044</span> if (this.conversionType.isArray()) {<a name="line.44"></a>
<span class="sourceLineNo">045</span> setConversionType(this.conversionType.getComponentType());<a name="line.45"></a>
<span class="sourceLineNo">046</span> final List&lt;Object&gt; values = new ArrayList&lt;&gt;();<a name="line.46"></a>
<span class="sourceLineNo">047</span> final Collection&lt;Node&gt; used = new ArrayList&lt;&gt;();<a name="line.47"></a>
<span class="sourceLineNo">048</span> log.append("={");<a name="line.48"></a>
<span class="sourceLineNo">049</span> boolean first = true;<a name="line.49"></a>
<span class="sourceLineNo">050</span> for (final Node child : node.getChildren()) {<a name="line.50"></a>
<span class="sourceLineNo">051</span> final PluginType&lt;?&gt; childType = child.getType();<a name="line.51"></a>
<span class="sourceLineNo">052</span> if (name.equalsIgnoreCase(childType.getElementName()) ||<a name="line.52"></a>
<span class="sourceLineNo">053</span> this.conversionType.isAssignableFrom(childType.getPluginClass())) {<a name="line.53"></a>
<span class="sourceLineNo">054</span> if (!first) {<a name="line.54"></a>
<span class="sourceLineNo">055</span> log.append(", ");<a name="line.55"></a>
<span class="sourceLineNo">056</span> }<a name="line.56"></a>
<span class="sourceLineNo">057</span> first = false;<a name="line.57"></a>
<span class="sourceLineNo">058</span> used.add(child);<a name="line.58"></a>
<span class="sourceLineNo">059</span> final Object childObject = child.getObject();<a name="line.59"></a>
<span class="sourceLineNo">060</span> if (childObject == null) {<a name="line.60"></a>
<span class="sourceLineNo">061</span> LOGGER.error("Null object returned for {} in {}.", child.getName(), node.getName());<a name="line.61"></a>
<span class="sourceLineNo">062</span> continue;<a name="line.62"></a>
<span class="sourceLineNo">063</span> }<a name="line.63"></a>
<span class="sourceLineNo">064</span> if (childObject.getClass().isArray()) {<a name="line.64"></a>
<span class="sourceLineNo">065</span> log.append(Arrays.toString((Object[]) childObject)).append('}');<a name="line.65"></a>
<span class="sourceLineNo">066</span> node.getChildren().removeAll(used);<a name="line.66"></a>
<span class="sourceLineNo">067</span> return childObject;<a name="line.67"></a>
<span class="sourceLineNo">068</span> }<a name="line.68"></a>
<span class="sourceLineNo">069</span> log.append(child.toString());<a name="line.69"></a>
<span class="sourceLineNo">070</span> values.add(childObject);<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> log.append('}');<a name="line.73"></a>
<span class="sourceLineNo">074</span> // note that we need to return an empty array instead of null if the types are correct<a name="line.74"></a>
<span class="sourceLineNo">075</span> if (!values.isEmpty() &amp;&amp; !this.conversionType.isAssignableFrom(values.get(0).getClass())) {<a name="line.75"></a>
<span class="sourceLineNo">076</span> LOGGER.error("Attempted to assign attribute {} to list of type {} which is incompatible with {}.",<a name="line.76"></a>
<span class="sourceLineNo">077</span> name, values.get(0).getClass(), this.conversionType);<a name="line.77"></a>
<span class="sourceLineNo">078</span> return null;<a name="line.78"></a>
<span class="sourceLineNo">079</span> }<a name="line.79"></a>
<span class="sourceLineNo">080</span> node.getChildren().removeAll(used);<a name="line.80"></a>
<span class="sourceLineNo">081</span> // we need to use reflection here because values.toArray() will cause type errors at runtime<a name="line.81"></a>
<span class="sourceLineNo">082</span> final Object[] array = (Object[]) Array.newInstance(this.conversionType, values.size());<a name="line.82"></a>
<span class="sourceLineNo">083</span> for (int i = 0; i &lt; array.length; i++) {<a name="line.83"></a>
<span class="sourceLineNo">084</span> array[i] = values.get(i);<a name="line.84"></a>
<span class="sourceLineNo">085</span> }<a name="line.85"></a>
<span class="sourceLineNo">086</span> return array;<a name="line.86"></a>
<span class="sourceLineNo">087</span> }<a name="line.87"></a>
<span class="sourceLineNo">088</span> final Node namedNode = findNamedNode(name, node.getChildren());<a name="line.88"></a>
<span class="sourceLineNo">089</span> if (namedNode == null) {<a name="line.89"></a>
<span class="sourceLineNo">090</span> log.append(name).append("=null");<a name="line.90"></a>
<span class="sourceLineNo">091</span> return null;<a name="line.91"></a>
<span class="sourceLineNo">092</span> }<a name="line.92"></a>
<span class="sourceLineNo">093</span> log.append(namedNode.getName()).append('(').append(namedNode.toString()).append(')');<a name="line.93"></a>
<span class="sourceLineNo">094</span> node.getChildren().remove(namedNode);<a name="line.94"></a>
<span class="sourceLineNo">095</span> return namedNode.getObject();<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> private Node findNamedNode(final String name, final Iterable&lt;Node&gt; children) {<a name="line.98"></a>
<span class="sourceLineNo">099</span> for (final Node child : children) {<a name="line.99"></a>
<span class="sourceLineNo">100</span> final PluginType&lt;?&gt; childType = child.getType();<a name="line.100"></a>
<span class="sourceLineNo">101</span> if (childType == null) {<a name="line.101"></a>
<span class="sourceLineNo">102</span> //System.out.println();<a name="line.102"></a>
<span class="sourceLineNo">103</span> }<a name="line.103"></a>
<span class="sourceLineNo">104</span> if (name.equalsIgnoreCase(childType.getElementName()) ||<a name="line.104"></a>
<span class="sourceLineNo">105</span> this.conversionType.isAssignableFrom(childType.getPluginClass())) {<a name="line.105"></a>
<span class="sourceLineNo">106</span> // FIXME: check child.getObject() for null?<a name="line.106"></a>
<span class="sourceLineNo">107</span> // doing so would be more consistent with the array version<a name="line.107"></a>
<span class="sourceLineNo">108</span> return child;<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> return null;<a name="line.111"></a>
<span class="sourceLineNo">112</span> }<a name="line.112"></a>
<span class="sourceLineNo">113</span>}<a name="line.113"></a>
</pre>
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