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apache / logging-log4j-site / 9755b12b39efbc0142688f9b1a11ec68db89f97b / . / 2.13.1 / log4j-core / apidocs / src-html / org / apache / logging / log4j / core / pattern / StyleConverter.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.pattern;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.util.Arrays;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.util.List;<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.core.LogEvent;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.apache.logging.log4j.core.config.Configuration;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.apache.logging.log4j.core.config.plugins.Plugin;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.apache.logging.log4j.core.layout.PatternLayout;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.apache.logging.log4j.core.util.Patterns;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.logging.log4j.util.PerformanceSensitive;<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>/**<a name="line.29"></a>
<span class="sourceLineNo">030</span> * Style pattern converter. Adds ANSI color styling to the result of the enclosed pattern.<a name="line.30"></a>
<span class="sourceLineNo">031</span> *<a name="line.31"></a>
<span class="sourceLineNo">032</span> * &lt;p&gt;<a name="line.32"></a>
<span class="sourceLineNo">033</span> * To disable ANSI output unconditionally, specify an additional option &lt;code&gt;disableAnsi=true&lt;/code&gt;, or to<a name="line.33"></a>
<span class="sourceLineNo">034</span> * disable ANSI output if no console is detected, specify option &lt;code&gt;noConsoleNoAnsi=true&lt;/code&gt;.<a name="line.34"></a>
<span class="sourceLineNo">035</span> * &lt;/p&gt;<a name="line.35"></a>
<span class="sourceLineNo">036</span> */<a name="line.36"></a>
<span class="sourceLineNo">037</span>@Plugin(name = "style", category = PatternConverter.CATEGORY)<a name="line.37"></a>
<span class="sourceLineNo">038</span>@ConverterKeys({ "style" })<a name="line.38"></a>
<span class="sourceLineNo">039</span>@PerformanceSensitive("allocation")<a name="line.39"></a>
<span class="sourceLineNo">040</span>public final class StyleConverter extends LogEventPatternConverter implements AnsiConverter {<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span> private final List&lt;PatternFormatter&gt; patternFormatters;<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span> private final boolean noAnsi;<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span> private final String style;<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span> private final String defaultStyle;<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span> /**<a name="line.50"></a>
<span class="sourceLineNo">051</span> * Constructs the converter.<a name="line.51"></a>
<span class="sourceLineNo">052</span> *<a name="line.52"></a>
<span class="sourceLineNo">053</span> * @param patternFormatters<a name="line.53"></a>
<span class="sourceLineNo">054</span> * The PatternFormatters to generate the text to manipulate.<a name="line.54"></a>
<span class="sourceLineNo">055</span> * @param style<a name="line.55"></a>
<span class="sourceLineNo">056</span> * The style that should encapsulate the pattern.<a name="line.56"></a>
<span class="sourceLineNo">057</span> * @param noAnsi<a name="line.57"></a>
<span class="sourceLineNo">058</span> * If true, do not output ANSI escape codes.<a name="line.58"></a>
<span class="sourceLineNo">059</span> */<a name="line.59"></a>
<span class="sourceLineNo">060</span> private StyleConverter(final List&lt;PatternFormatter&gt; patternFormatters, final String style, final boolean noAnsi) {<a name="line.60"></a>
<span class="sourceLineNo">061</span> super("style", "style");<a name="line.61"></a>
<span class="sourceLineNo">062</span> this.patternFormatters = patternFormatters;<a name="line.62"></a>
<span class="sourceLineNo">063</span> this.style = style;<a name="line.63"></a>
<span class="sourceLineNo">064</span> this.defaultStyle = AnsiEscape.getDefaultStyle();<a name="line.64"></a>
<span class="sourceLineNo">065</span> this.noAnsi = noAnsi;<a name="line.65"></a>
<span class="sourceLineNo">066</span> }<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> * Gets an instance of the class.<a name="line.69"></a>
<span class="sourceLineNo">070</span> *<a name="line.70"></a>
<span class="sourceLineNo">071</span> * @param config<a name="line.71"></a>
<span class="sourceLineNo">072</span> * The current Configuration.<a name="line.72"></a>
<span class="sourceLineNo">073</span> * @param options<a name="line.73"></a>
<span class="sourceLineNo">074</span> * pattern options, may be null. If first element is "short", only the first line of the throwable will<a name="line.74"></a>
<span class="sourceLineNo">075</span> * be formatted.<a name="line.75"></a>
<span class="sourceLineNo">076</span> * @return instance of class.<a name="line.76"></a>
<span class="sourceLineNo">077</span> */<a name="line.77"></a>
<span class="sourceLineNo">078</span> public static StyleConverter newInstance(final Configuration config, final String[] options) {<a name="line.78"></a>
<span class="sourceLineNo">079</span> if (options == null) {<a name="line.79"></a>
<span class="sourceLineNo">080</span> return null;<a name="line.80"></a>
<span class="sourceLineNo">081</span> }<a name="line.81"></a>
<span class="sourceLineNo">082</span> if (options.length &lt; 2) {<a name="line.82"></a>
<span class="sourceLineNo">083</span> LOGGER.error("Incorrect number of options on style. Expected at least 1, received " + options.length);<a name="line.83"></a>
<span class="sourceLineNo">084</span> return null;<a name="line.84"></a>
<span class="sourceLineNo">085</span> }<a name="line.85"></a>
<span class="sourceLineNo">086</span> if (options[0] == null) {<a name="line.86"></a>
<span class="sourceLineNo">087</span> LOGGER.error("No pattern supplied for style converter");<a name="line.87"></a>
<span class="sourceLineNo">088</span> return null;<a name="line.88"></a>
<span class="sourceLineNo">089</span> }<a name="line.89"></a>
<span class="sourceLineNo">090</span> if (options[1] == null) {<a name="line.90"></a>
<span class="sourceLineNo">091</span> LOGGER.error("No style attributes supplied for style converter");<a name="line.91"></a>
<span class="sourceLineNo">092</span> return null;<a name="line.92"></a>
<span class="sourceLineNo">093</span> }<a name="line.93"></a>
<span class="sourceLineNo">094</span> final PatternParser parser = PatternLayout.createPatternParser(config);<a name="line.94"></a>
<span class="sourceLineNo">095</span> final List&lt;PatternFormatter&gt; formatters = parser.parse(options[0]);<a name="line.95"></a>
<span class="sourceLineNo">096</span> final String style = AnsiEscape.createSequence(options[1].split(Patterns.COMMA_SEPARATOR));<a name="line.96"></a>
<span class="sourceLineNo">097</span> final boolean disableAnsi = Arrays.toString(options).contains(PatternParser.DISABLE_ANSI + "=true");<a name="line.97"></a>
<span class="sourceLineNo">098</span> final boolean noConsoleNoAnsi = Arrays.toString(options).contains(PatternParser.NO_CONSOLE_NO_ANSI + "=true");<a name="line.98"></a>
<span class="sourceLineNo">099</span> final boolean hideAnsi = disableAnsi || (noConsoleNoAnsi &amp;&amp; System.console() == null);<a name="line.99"></a>
<span class="sourceLineNo">100</span> return new StyleConverter(formatters, style, hideAnsi);<a name="line.100"></a>
<span class="sourceLineNo">101</span> }<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> * {@inheritDoc}<a name="line.104"></a>
<span class="sourceLineNo">105</span> */<a name="line.105"></a>
<span class="sourceLineNo">106</span> @Override<a name="line.106"></a>
<span class="sourceLineNo">107</span> public void format(final LogEvent event, final StringBuilder toAppendTo) {<a name="line.107"></a>
<span class="sourceLineNo">108</span> int start = 0;<a name="line.108"></a>
<span class="sourceLineNo">109</span> int end = 0;<a name="line.109"></a>
<span class="sourceLineNo">110</span> if (!noAnsi) { // use ANSI: set prefix<a name="line.110"></a>
<span class="sourceLineNo">111</span> start = toAppendTo.length();<a name="line.111"></a>
<span class="sourceLineNo">112</span> toAppendTo.append(style);<a name="line.112"></a>
<span class="sourceLineNo">113</span> end = toAppendTo.length();<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>
<span class="sourceLineNo">116</span> //noinspection ForLoopReplaceableByForEach<a name="line.116"></a>
<span class="sourceLineNo">117</span> for (int i = 0, size = patternFormatters.size(); i &lt; size; i++) {<a name="line.117"></a>
<span class="sourceLineNo">118</span> patternFormatters.get(i).format(event, toAppendTo);<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> // if we use ANSI we need to add the postfix or erase the unnecessary prefix<a name="line.121"></a>
<span class="sourceLineNo">122</span> if (!noAnsi) {<a name="line.122"></a>
<span class="sourceLineNo">123</span> if (toAppendTo.length() == end) {<a name="line.123"></a>
<span class="sourceLineNo">124</span> toAppendTo.setLength(start); // erase prefix<a name="line.124"></a>
<span class="sourceLineNo">125</span> } else {<a name="line.125"></a>
<span class="sourceLineNo">126</span> toAppendTo.append(defaultStyle); // add postfix<a name="line.126"></a>
<span class="sourceLineNo">127</span> }<a name="line.127"></a>
<span class="sourceLineNo">128</span> }<a name="line.128"></a>
<span class="sourceLineNo">129</span> }<a name="line.129"></a>
<span class="sourceLineNo">130</span><a name="line.130"></a>
<span class="sourceLineNo">131</span> @Override<a name="line.131"></a>
<span class="sourceLineNo">132</span> public boolean handlesThrowable() {<a name="line.132"></a>
<span class="sourceLineNo">133</span> for (final PatternFormatter formatter : patternFormatters) {<a name="line.133"></a>
<span class="sourceLineNo">134</span> if (formatter.handlesThrowable()) {<a name="line.134"></a>
<span class="sourceLineNo">135</span> return true;<a name="line.135"></a>
<span class="sourceLineNo">136</span> }<a name="line.136"></a>
<span class="sourceLineNo">137</span> }<a name="line.137"></a>
<span class="sourceLineNo">138</span> return false;<a name="line.138"></a>
<span class="sourceLineNo">139</span> }<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span> /**<a name="line.141"></a>
<span class="sourceLineNo">142</span> * Returns a String suitable for debugging.<a name="line.142"></a>
<span class="sourceLineNo">143</span> *<a name="line.143"></a>
<span class="sourceLineNo">144</span> * @return a String suitable for debugging.<a name="line.144"></a>
<span class="sourceLineNo">145</span> */<a name="line.145"></a>
<span class="sourceLineNo">146</span> @Override<a name="line.146"></a>
<span class="sourceLineNo">147</span> public String toString() {<a name="line.147"></a>
<span class="sourceLineNo">148</span> final StringBuilder sb = new StringBuilder();<a name="line.148"></a>
<span class="sourceLineNo">149</span> sb.append(super.toString());<a name="line.149"></a>
<span class="sourceLineNo">150</span> sb.append("[style=");<a name="line.150"></a>
<span class="sourceLineNo">151</span> sb.append(style);<a name="line.151"></a>
<span class="sourceLineNo">152</span> sb.append(", defaultStyle=");<a name="line.152"></a>
<span class="sourceLineNo">153</span> sb.append(defaultStyle);<a name="line.153"></a>
<span class="sourceLineNo">154</span> sb.append(", patternFormatters=");<a name="line.154"></a>
<span class="sourceLineNo">155</span> sb.append(patternFormatters);<a name="line.155"></a>
<span class="sourceLineNo">156</span> sb.append(", noAnsi=");<a name="line.156"></a>
<span class="sourceLineNo">157</span> sb.append(noAnsi);<a name="line.157"></a>
<span class="sourceLineNo">158</span> sb.append(']');<a name="line.158"></a>
<span class="sourceLineNo">159</span> return sb.toString();<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>}<a name="line.162"></a>
</pre>
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