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<title>Filter (Log4j Version 1.2.17)</title>
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<div class="subTitle">org.apache.log4j.spi</div>
<h2 title="Class Filter" class="title">Class Filter</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<ul class="inheritance">
<li>org.apache.log4j.spi.Filter</li>
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<dt>All Implemented Interfaces:</dt>
<dd><a href="../../../../org/apache/log4j/spi/OptionHandler.html" title="interface in org.apache.log4j.spi">OptionHandler</a></dd>
</dl>
<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../org/apache/log4j/varia/DenyAllFilter.html" title="class in org.apache.log4j.varia">DenyAllFilter</a>, <a href="../../../../org/apache/log4j/varia/LevelMatchFilter.html" title="class in org.apache.log4j.varia">LevelMatchFilter</a>, <a href="../../../../org/apache/log4j/varia/LevelRangeFilter.html" title="class in org.apache.log4j.varia">LevelRangeFilter</a>, <a href="../../../../org/apache/log4j/varia/StringMatchFilter.html" title="class in org.apache.log4j.varia">StringMatchFilter</a></dd>
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<pre>public abstract class <span class="typeNameLabel">Filter</span>
extends java.lang.Object
implements <a href="../../../../org/apache/log4j/spi/OptionHandler.html" title="interface in org.apache.log4j.spi">OptionHandler</a></pre>
<div class="block">Users should extend this class to implement customized logging
event filtering. Note that <a href="../../../../org/apache/log4j/Category.html" title="class in org.apache.log4j"><code>Category</code></a> and <a href="../../../../org/apache/log4j/AppenderSkeleton.html" title="class in org.apache.log4j"><code>AppenderSkeleton</code></a>, the parent class of all standard
appenders, have built-in filtering rules. It is suggested that you
first use and understand the built-in rules before rushing to write
your own custom filters.
<p>This abstract class assumes and also imposes that filters be
organized in a linear chain. The <a href="../../../../org/apache/log4j/spi/Filter.html#decide-org.apache.log4j.spi.LoggingEvent-"><code>decide(LoggingEvent)</code></a> method of each filter is called sequentially,
in the order of their addition to the chain.
<p>The <a href="../../../../org/apache/log4j/spi/Filter.html#decide-org.apache.log4j.spi.LoggingEvent-"><code>decide(LoggingEvent)</code></a> method must return one
of the integer constants <a href="../../../../org/apache/log4j/spi/Filter.html#DENY"><code>DENY</code></a>, <a href="../../../../org/apache/log4j/spi/Filter.html#NEUTRAL"><code>NEUTRAL</code></a> or <a href="../../../../org/apache/log4j/spi/Filter.html#ACCEPT"><code>ACCEPT</code></a>.
<p>If the value <a href="../../../../org/apache/log4j/spi/Filter.html#DENY"><code>DENY</code></a> is returned, then the log event is
dropped immediately without consulting with the remaining
filters.
<p>If the value <a href="../../../../org/apache/log4j/spi/Filter.html#NEUTRAL"><code>NEUTRAL</code></a> is returned, then the next filter
in the chain is consulted. If there are no more filters in the
chain, then the log event is logged. Thus, in the presence of no
filters, the default behaviour is to log all logging events.
<p>If the value <a href="../../../../org/apache/log4j/spi/Filter.html#ACCEPT"><code>ACCEPT</code></a> is returned, then the log
event is logged without consulting the remaining filters.
<p>The philosophy of log4j filters is largely inspired from the
Linux ipchains.
<p>Note that filtering is only supported by the <a href="../../../../org/apache/log4j/xml/DOMConfigurator.html" title="class in org.apache.log4j.xml"><code>DOMConfigurator</code></a>. The <a href="../../../../org/apache/log4j/PropertyConfigurator.html" title="class in org.apache.log4j"><code>PropertyConfigurator</code></a> does not
support filters.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>0.9.0</dd>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Ceki Gülcü</dd>
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<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/spi/Filter.html#ACCEPT">ACCEPT</a></span></code>
<div class="block">The log event must be logged immediately without consulting with
the remaining filters, if any, in the chain.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/spi/Filter.html#DENY">DENY</a></span></code>
<div class="block">The log event must be dropped immediately without consulting
with the remaining filters, if any, in the chain.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/spi/Filter.html#NEUTRAL">NEUTRAL</a></span></code>
<div class="block">This filter is neutral with respect to the log event.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/log4j/spi/Filter.html" title="class in org.apache.log4j.spi">Filter</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/spi/Filter.html#next">next</a></span></code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>
<div class="block"><span class="deprecationComment">As of 1.2.12, use <a href="../../../../org/apache/log4j/spi/Filter.html#getNext--"><code>getNext()</code></a> and <a href="../../../../org/apache/log4j/spi/Filter.html#setNext-org.apache.log4j.spi.Filter-"><code>setNext(org.apache.log4j.spi.Filter)</code></a> instead</span></div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/spi/Filter.html#Filter--">Filter</a></span>()</code> </td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/spi/Filter.html#activateOptions--">activateOptions</a></span>()</code>
<div class="block">Usually filters options become active when set.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>abstract int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/spi/Filter.html#decide-org.apache.log4j.spi.LoggingEvent-">decide</a></span>(<a href="../../../../org/apache/log4j/spi/LoggingEvent.html" title="class in org.apache.log4j.spi">LoggingEvent</a> event)</code>
<div class="block">If the decision is <code>DENY</code>, then the event will be
dropped.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/log4j/spi/Filter.html" title="class in org.apache.log4j.spi">Filter</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/spi/Filter.html#getNext--">getNext</a></span>()</code>
<div class="block">Return the pointer to the next filter;</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/log4j/spi/Filter.html#setNext-org.apache.log4j.spi.Filter-">setNext</a></span>(<a href="../../../../org/apache/log4j/spi/Filter.html" title="class in org.apache.log4j.spi">Filter</a> next)</code>
<div class="block">Set the next filter pointer.</div>
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<h3>Methods inherited from class java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<pre>public <a href="../../../../org/apache/log4j/spi/Filter.html" title="class in org.apache.log4j.spi">Filter</a> next</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span> <span class="deprecationComment">As of 1.2.12, use <a href="../../../../org/apache/log4j/spi/Filter.html#getNext--"><code>getNext()</code></a> and <a href="../../../../org/apache/log4j/spi/Filter.html#setNext-org.apache.log4j.spi.Filter-"><code>setNext(org.apache.log4j.spi.Filter)</code></a> instead</span></div>
<div class="block">Points to the next filter in the filter chain.</div>
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<a name="DENY">
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<h4>DENY</h4>
<pre>public static final int DENY</pre>
<div class="block">The log event must be dropped immediately without consulting
with the remaining filters, if any, in the chain.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.apache.log4j.spi.Filter.DENY">Constant Field Values</a></dd>
</dl>
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<a name="NEUTRAL">
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<h4>NEUTRAL</h4>
<pre>public static final int NEUTRAL</pre>
<div class="block">This filter is neutral with respect to the log event. The
remaining filters, if any, should be consulted for a final decision.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.apache.log4j.spi.Filter.NEUTRAL">Constant Field Values</a></dd>
</dl>
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<h4>ACCEPT</h4>
<pre>public static final int ACCEPT</pre>
<div class="block">The log event must be logged immediately without consulting with
the remaining filters, if any, in the chain.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../constant-values.html#org.apache.log4j.spi.Filter.ACCEPT">Constant Field Values</a></dd>
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<h4>Filter</h4>
<pre>public Filter()</pre>
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<h4>activateOptions</h4>
<pre>public void activateOptions()</pre>
<div class="block">Usually filters options become active when set. We provide a
default do-nothing implementation for convenience.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../org/apache/log4j/spi/OptionHandler.html#activateOptions--">activateOptions</a></code> in interface <code><a href="../../../../org/apache/log4j/spi/OptionHandler.html" title="interface in org.apache.log4j.spi">OptionHandler</a></code></dd>
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<h4>decide</h4>
<pre>public abstract int decide(<a href="../../../../org/apache/log4j/spi/LoggingEvent.html" title="class in org.apache.log4j.spi">LoggingEvent</a> event)</pre>
<div class="block"><p>If the decision is <code>DENY</code>, then the event will be
dropped. If the decision is <code>NEUTRAL</code>, then the next
filter, if any, will be invoked. If the decision is ACCEPT then
the event will be logged without consulting with other filters in
the chain.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>event</code> - The LoggingEvent to decide upon.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>decision The decision of the filter.</dd>
</dl>
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<h4>setNext</h4>
<pre>public void setNext(<a href="../../../../org/apache/log4j/spi/Filter.html" title="class in org.apache.log4j.spi">Filter</a> next)</pre>
<div class="block">Set the next filter pointer.</div>
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<h4>getNext</h4>
<pre>public <a href="../../../../org/apache/log4j/spi/Filter.html" title="class in org.apache.log4j.spi">Filter</a> getNext()</pre>
<div class="block">Return the pointer to the next filter;</div>
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<div class="aboutLanguage"><b>Log4j 1.2.17</b><!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the 'License'); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an 'AS IS' BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --></div>
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