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11<a name="1" href="#1">1</a> <em class="jxr_comment">/*</em>
12<a name="2" href="#2">2</a> <em class="jxr_comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</em>
13<a name="3" href="#3">3</a> <em class="jxr_comment"> * contributor license agreements. See the NOTICE file distributed with</em>
14<a name="4" href="#4">4</a> <em class="jxr_comment"> * this work for additional information regarding copyright ownership.</em>
15<a name="5" href="#5">5</a> <em class="jxr_comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</em>
16<a name="6" href="#6">6</a> <em class="jxr_comment"> * (the "License"); you may not use this file except in compliance with</em>
17<a name="7" href="#7">7</a> <em class="jxr_comment"> * the License. You may obtain a copy of the License at</em>
18<a name="8" href="#8">8</a> <em class="jxr_comment"> * </em>
19<a name="9" href="#9">9</a> <em class="jxr_comment"> * <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
20<a name="10" href="#10">10</a> <em class="jxr_comment"> * </em>
21<a name="11" href="#11">11</a> <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
22<a name="12" href="#12">12</a> <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
23<a name="13" href="#13">13</a> <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
24<a name="14" href="#14">14</a> <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
25<a name="15" href="#15">15</a> <em class="jxr_comment"> * limitations under the License.</em>
26<a name="16" href="#16">16</a> <em class="jxr_comment"> */</em>
27<a name="17" href="#17">17</a>
28<a name="18" href="#18">18</a> <strong class="jxr_keyword">package</strong> org.apache.log4j;
29<a name="19" href="#19">19</a> <strong class="jxr_keyword">import</strong> org.apache.log4j.helpers.PatternParser;
30<a name="20" href="#20">20</a>
31<a name="21" href="#21">21</a> <em class="jxr_javadoccomment">/**</em>
32<a name="22" href="#22">22</a>
33<a name="23" href="#23">23</a> <em class="jxr_javadoccomment"> Example showing how to extend PatternLayout to recognize additional</em>
34<a name="24" href="#24">24</a> <em class="jxr_javadoccomment"> conversion characters. </em>
35<a name="25" href="#25">25</a> <em class="jxr_javadoccomment"> </em>
36<a name="26" href="#26">26</a> <em class="jxr_javadoccomment"> <p>In this case MyPatternLayout recognizes %# conversion pattern. It</em>
37<a name="27" href="#27">27</a> <em class="jxr_javadoccomment"> outputs the value of an internal counter which is also incremented</em>
38<a name="28" href="#28">28</a> <em class="jxr_javadoccomment"> at each call.</em>
39<a name="29" href="#29">29</a>
40<a name="30" href="#30">30</a> <em class="jxr_javadoccomment"> <p>See <a href=doc-files/MyPatternLayout.java><b>source</b></a> code</em>
41<a name="31" href="#31">31</a> <em class="jxr_javadoccomment"> for more details.</em>
42<a name="32" href="#32">32</a>
43<a name="33" href="#33">33</a> <em class="jxr_javadoccomment"> @see MyPatternParser</em>
44<a name="34" href="#34">34</a> <em class="jxr_javadoccomment"> @see org.apache.log4j.PatternLayout</em>
45<a name="35" href="#35">35</a> <em class="jxr_javadoccomment"> @author Anders Kristensen </em>
46<a name="36" href="#36">36</a> <em class="jxr_javadoccomment">*/</em>
47<a name="37" href="#37">37</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../org/apache/log4j/MyPatternLayout.html">MyPatternLayout</a> <strong class="jxr_keyword">extends</strong> PatternLayout {
48<a name="38" href="#38">38</a> <strong class="jxr_keyword">public</strong>
49<a name="39" href="#39">39</a> <a href="../../../org/apache/log4j/MyPatternLayout.html">MyPatternLayout</a>() {
50<a name="40" href="#40">40</a> <strong class="jxr_keyword">this</strong>(DEFAULT_CONVERSION_PATTERN);
51<a name="41" href="#41">41</a> }
52<a name="42" href="#42">42</a>
53<a name="43" href="#43">43</a> <strong class="jxr_keyword">public</strong>
54<a name="44" href="#44">44</a> <a href="../../../org/apache/log4j/MyPatternLayout.html">MyPatternLayout</a>(String pattern) {
55<a name="45" href="#45">45</a> <strong class="jxr_keyword">super</strong>(pattern);
56<a name="46" href="#46">46</a> }
57<a name="47" href="#47">47</a>
58<a name="48" href="#48">48</a> <strong class="jxr_keyword">public</strong>
59<a name="49" href="#49">49</a> PatternParser createPatternParser(String pattern) {
60<a name="50" href="#50">50</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../org/apache/log4j/MyPatternParser.html">MyPatternParser</a>(
61<a name="51" href="#51">51</a> pattern == <strong class="jxr_keyword">null</strong> ? DEFAULT_CONVERSION_PATTERN : pattern);
62<a name="52" href="#52">52</a> }
63<a name="53" href="#53">53</a>
64<a name="54" href="#54">54</a> <strong class="jxr_keyword">public</strong>
65<a name="55" href="#55">55</a> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> main(String[] args) {
66<a name="56" href="#56">56</a> Layout layout = <strong class="jxr_keyword">new</strong> <a href="../../../org/apache/log4j/MyPatternLayout.html">MyPatternLayout</a>(<span class="jxr_string">"[counter=%.10#] - %m%n"</span>);
67<a name="57" href="#57">57</a> Logger logger = Logger.getLogger(<span class="jxr_string">"some.cat"</span>);
68<a name="58" href="#58">58</a> logger.addAppender(<strong class="jxr_keyword">new</strong> ConsoleAppender(layout, ConsoleAppender.SYSTEM_OUT));
69<a name="59" href="#59">59</a> logger.debug(<span class="jxr_string">"Hello, log"</span>);
70<a name="60" href="#60">60</a> logger.info(<span class="jxr_string">"Hello again..."</span>);
71<a name="61" href="#61">61</a> }
72<a name="62" href="#62">62</a> }
73</pre>
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