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9<div id="overview"><a href="../../../../../apidocs/org/apache/log4j/rewrite/MapRewritePolicy.html">View Javadoc</a></div><pre>
10
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> <strong class="jxr_keyword">package</strong> org.apache.log4j.rewrite;
28<a name="18" href="#18">18</a>
29<a name="19" href="#19">19</a> <strong class="jxr_keyword">import</strong> java.util.HashMap;
30<a name="20" href="#20">20</a> <strong class="jxr_keyword">import</strong> java.util.Iterator;
31<a name="21" href="#21">21</a> <strong class="jxr_keyword">import</strong> java.util.Map;
32<a name="22" href="#22">22</a>
33<a name="23" href="#23">23</a> <strong class="jxr_keyword">import</strong> org.apache.log4j.Logger;
34<a name="24" href="#24">24</a> <strong class="jxr_keyword">import</strong> org.apache.log4j.spi.LoggingEvent;
35<a name="25" href="#25">25</a>
36<a name="26" href="#26">26</a> <em class="jxr_javadoccomment">/**</em>
37<a name="27" href="#27">27</a> <em class="jxr_javadoccomment"> * This policy rewrites events where the message of the</em>
38<a name="28" href="#28">28</a> <em class="jxr_javadoccomment"> * original event implementes java.util.Map.</em>
39<a name="29" href="#29">29</a> <em class="jxr_javadoccomment"> * All other events are passed through unmodified.</em>
40<a name="30" href="#30">30</a> <em class="jxr_javadoccomment"> * If the map contains a "message" entry, the value will be</em>
41<a name="31" href="#31">31</a> <em class="jxr_javadoccomment"> * used as the message for the rewritten event. The rewritten</em>
42<a name="32" href="#32">32</a> <em class="jxr_javadoccomment"> * event will have a property set that is the combination of the</em>
43<a name="33" href="#33">33</a> <em class="jxr_javadoccomment"> * original property set and the other members of the message map.</em>
44<a name="34" href="#34">34</a> <em class="jxr_javadoccomment"> * If both the original property set and the message map</em>
45<a name="35" href="#35">35</a> <em class="jxr_javadoccomment"> * contain the same entry, the value from the message map</em>
46<a name="36" href="#36">36</a> <em class="jxr_javadoccomment"> * will overwrite the original property set.</em>
47<a name="37" href="#37">37</a> <em class="jxr_javadoccomment"> *</em>
48<a name="38" href="#38">38</a> <em class="jxr_javadoccomment"> * The combination of the RewriteAppender and this policy</em>
49<a name="39" href="#39">39</a> <em class="jxr_javadoccomment"> * performs the same actions as the MapFilter from log4j 1.3. </em>
50<a name="40" href="#40">40</a> <em class="jxr_javadoccomment"> */</em>
51<a name="41" href="#41">41</a> <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../org/apache/log4j/rewrite/MapRewritePolicy.html">MapRewritePolicy</a> implements <a href="../../../../org/apache/log4j/rewrite/RewritePolicy.html">RewritePolicy</a> {
52<a name="42" href="#42">42</a> <em class="jxr_javadoccomment">/**</em>
53<a name="43" href="#43">43</a> <em class="jxr_javadoccomment"> * {@inheritDoc}</em>
54<a name="44" href="#44">44</a> <em class="jxr_javadoccomment"> */</em>
55<a name="45" href="#45">45</a> <strong class="jxr_keyword">public</strong> <a href="../../../../org/apache/log4j/spi/LoggingEvent.html">LoggingEvent</a> rewrite(<strong class="jxr_keyword">final</strong> <a href="../../../../org/apache/log4j/spi/LoggingEvent.html">LoggingEvent</a> source) {
56<a name="46" href="#46">46</a> Object msg = source.getMessage();
57<a name="47" href="#47">47</a> <strong class="jxr_keyword">if</strong> (msg instanceof Map) {
58<a name="48" href="#48">48</a> Map props = <strong class="jxr_keyword">new</strong> HashMap(source.getProperties());
59<a name="49" href="#49">49</a> Map eventProps = (Map) msg;
60<a name="50" href="#50">50</a> <em class="jxr_comment">//</em>
61<a name="51" href="#51">51</a> <em class="jxr_comment">// if the map sent in the logging request</em>
62<a name="52" href="#52">52</a> <em class="jxr_comment">// has "message" entry, use that as the message body</em>
63<a name="53" href="#53">53</a> <em class="jxr_comment">// otherwise, use the entire map.</em>
64<a name="54" href="#54">54</a> <em class="jxr_comment">//</em>
65<a name="55" href="#55">55</a> Object newMsg = eventProps.get(<span class="jxr_string">"message"</span>);
66<a name="56" href="#56">56</a> <strong class="jxr_keyword">if</strong> (newMsg == <strong class="jxr_keyword">null</strong>) {
67<a name="57" href="#57">57</a> newMsg = msg;
68<a name="58" href="#58">58</a> }
69<a name="59" href="#59">59</a>
70<a name="60" href="#60">60</a> <strong class="jxr_keyword">for</strong>(Iterator iter = eventProps.entrySet().iterator();
71<a name="61" href="#61">61</a> iter.hasNext();
72<a name="62" href="#62">62</a> ) {
73<a name="63" href="#63">63</a> Map.Entry entry = (Map.Entry) iter.next();
74<a name="64" href="#64">64</a> <strong class="jxr_keyword">if</strong> (!(<span class="jxr_string">"message"</span>.equals(entry.getKey()))) {
75<a name="65" href="#65">65</a> props.put(entry.getKey(), entry.getValue());
76<a name="66" href="#66">66</a> }
77<a name="67" href="#67">67</a> }
78<a name="68" href="#68">68</a>
79<a name="69" href="#69">69</a> <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">new</strong> <a href="../../../../org/apache/log4j/spi/LoggingEvent.html">LoggingEvent</a>(
80<a name="70" href="#70">70</a> source.getFQNOfLoggerClass(),
81<a name="71" href="#71">71</a> source.getLogger() != <strong class="jxr_keyword">null</strong> ? source.getLogger(): Logger.getLogger(source.getLoggerName()),
82<a name="72" href="#72">72</a> source.getTimeStamp(),
83<a name="73" href="#73">73</a> source.getLevel(),
84<a name="74" href="#74">74</a> newMsg,
85<a name="75" href="#75">75</a> source.getThreadName(),
86<a name="76" href="#76">76</a> source.getThrowableInformation(),
87<a name="77" href="#77">77</a> source.getNDC(),
88<a name="78" href="#78">78</a> source.getLocationInformation(),
89<a name="79" href="#79">79</a> props);
90<a name="80" href="#80">80</a> } <strong class="jxr_keyword">else</strong> {
91<a name="81" href="#81">81</a> <strong class="jxr_keyword">return</strong> source;
92<a name="82" href="#82">82</a> }
93<a name="83" href="#83">83</a>
94<a name="84" href="#84">84</a> }
95<a name="85" href="#85">85</a> }
96</pre>
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