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apache / logging-site / a4f88a44f9ece0268ea2d36ba57a00f2b881cabc / . / content / log4j / 2.13.0 / log4j-jpa / apidocs / src-html / org / apache / logging / log4j / core / appender / db / jpa / converter / ContextStackAttributeConverter.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>package org.apache.logging.log4j.core.appender.db.jpa.converter;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import javax.persistence.AttributeConverter;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import javax.persistence.Converter;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.apache.logging.log4j.ThreadContext;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>/**<a name="line.24"></a>
<span class="sourceLineNo">025</span> * A JPA 2.1 attribute converter for<a name="line.25"></a>
<span class="sourceLineNo">026</span> * {@link org.apache.logging.log4j.ThreadContext.ContextStack ThreadContext.ContextStack}s in<a name="line.26"></a>
<span class="sourceLineNo">027</span> * {@link org.apache.logging.log4j.core.LogEvent}s. This converter is only capable of converting to {@link String}s. The<a name="line.27"></a>
<span class="sourceLineNo">028</span> * {@link #convertToEntityAttribute(String)} method throws an {@link UnsupportedOperationException}. If you need to<a name="line.28"></a>
<span class="sourceLineNo">029</span> * support converting to an entity attribute, you should use the {@link ContextStackJsonAttributeConverter} for<a name="line.29"></a>
<span class="sourceLineNo">030</span> * conversion both ways.<a name="line.30"></a>
<span class="sourceLineNo">031</span> */<a name="line.31"></a>
<span class="sourceLineNo">032</span>@Converter(autoApply = false)<a name="line.32"></a>
<span class="sourceLineNo">033</span>public class ContextStackAttributeConverter implements AttributeConverter&lt;ThreadContext.ContextStack, String&gt; {<a name="line.33"></a>
<span class="sourceLineNo">034</span> @Override<a name="line.34"></a>
<span class="sourceLineNo">035</span> public String convertToDatabaseColumn(final ThreadContext.ContextStack contextStack) {<a name="line.35"></a>
<span class="sourceLineNo">036</span> if (contextStack == null) {<a name="line.36"></a>
<span class="sourceLineNo">037</span> return null;<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> final StringBuilder builder = new StringBuilder();<a name="line.40"></a>
<span class="sourceLineNo">041</span> for (final String value : contextStack.asList()) {<a name="line.41"></a>
<span class="sourceLineNo">042</span> if (builder.length() &gt; 0) {<a name="line.42"></a>
<span class="sourceLineNo">043</span> builder.append('\n');<a name="line.43"></a>
<span class="sourceLineNo">044</span> }<a name="line.44"></a>
<span class="sourceLineNo">045</span> builder.append(value);<a name="line.45"></a>
<span class="sourceLineNo">046</span> }<a name="line.46"></a>
<span class="sourceLineNo">047</span> return builder.toString();<a name="line.47"></a>
<span class="sourceLineNo">048</span> }<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span> @Override<a name="line.50"></a>
<span class="sourceLineNo">051</span> public ThreadContext.ContextStack convertToEntityAttribute(final String s) {<a name="line.51"></a>
<span class="sourceLineNo">052</span> throw new UnsupportedOperationException("Log events can only be persisted, not extracted.");<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>
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