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<div id="projectname">Apache log4cxx <span id="projectnumber">Version 0.10.0</span></div>
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<h1>Filter Class Reference</h1> </div>
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<!-- doxytag: class="log4cxx::spi::Filter" --><!-- doxytag: inherits="log4cxx::spi::OptionHandler,log4cxx::helpers::ObjectImpl" -->
<p>Users should extend this class to implement customized logging event filtering.
<a href="#_details">More...</a></p>
<p>Inherits <a class="el" href="classlog4cxx_1_1spi_1_1_option_handler.html">log4cxx::spi::OptionHandler</a>, and <a class="el" href="classlog4cxx_1_1helpers_1_1_object_impl.html">log4cxx::helpers::ObjectImpl</a>.</p>
<p>Inherited by <a class="el" href="classlog4cxx_1_1filter_1_1_and_filter.html">AndFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_deny_all_filter.html">DenyAllFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_expression_filter.html">ExpressionFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_level_match_filter.html">LevelMatchFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_level_range_filter.html">LevelRangeFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_location_info_filter.html">LocationInfoFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_map_filter.html">MapFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_property_filter.html">PropertyFilter</a>, and <a class="el" href="classlog4cxx_1_1filter_1_1_string_match_filter.html">StringMatchFilter</a>.</p>
<p><a href="classlog4cxx_1_1spi_1_1_filter-members.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-types"></a>
Public Types</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcd">FilterDecision</a> { <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcda692e4d49cf7d68c58e78875ae1833fc3">DENY</a> = -1,
<a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcdaf46d14eb9d5d71afc9f6e747689fcb56">NEUTRAL</a> = 0,
<a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcda5707b7b8bf1b098d620552e9576d8061">ACCEPT</a> = 1
}</td></tr>
<tr><td colspan="2"><h2><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#ad724ba04cbde6118ceddbd6635e96eaa">Filter</a> ()</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a0198815940c2715c84b0e04828cf8dfa">addRef</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a55c31efee1904916b999395fa4d46a24">releaseRef</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">log4cxx::spi::FilterPtr</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#ac6ecf1ac8f2f77c59ec5bb44b702de4f">getNext</a> () const </td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#adb980cf7b7dedc3e2678a5461ccc717e">setNext</a> (const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">log4cxx::spi::FilterPtr</a> &newNext)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#aa3df68f8aae152299471992071e202f5">activateOptions</a> (<a class="el" href="classlog4cxx_1_1helpers_1_1_pool.html">log4cxx::helpers::Pool</a> &p)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Usually filters options become active when set. <a href="#aa3df68f8aae152299471992071e202f5"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#ac1d269357907e0809687a2bec962e1c8">setOption</a> (const <a class="el" href="namespacelog4cxx.html#ad7ec98d27bca7666e23f27dd1fb181c8">LogString</a> &option, const <a class="el" href="namespacelog4cxx.html#ad7ec98d27bca7666e23f27dd1fb181c8">LogString</a> &value)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set <code>option</code> to <code>value</code>. <a href="#ac1d269357907e0809687a2bec962e1c8"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">virtual <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcd">FilterDecision</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a88283dec47599dde698374489126f01c">decide</a> (const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">LoggingEventPtr</a> &event) const =0</td></tr>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
<div class="textblock"><p>Users should extend this class to implement customized logging event filtering. </p>
<p>Note that <a class="el" href="classlog4cxx_1_1_logger.html" title="This is the central class in the log4cxx package.">Logger</a> and <a class="el" href="classlog4cxx_1_1_appender_skeleton.html" title="Implementation base class for all appenders.">AppenderSkeleton</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>
<p>This abstract class assumes and also imposes that filters be organized in a linear chain. The <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a88283dec47599dde698374489126f01c">decide(LoggingEvent)</a> method of each filter is called sequentially, in the order of their addition to the chain.</p>
<p>The <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a88283dec47599dde698374489126f01c">decide(LoggingEvent)</a> method must return one of the integer constants <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcda692e4d49cf7d68c58e78875ae1833fc3" title="The log event must be dropped immediately without consulting with the remaining filters, if any, in the chain.">DENY</a>, <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcdaf46d14eb9d5d71afc9f6e747689fcb56" title="This filter is neutral with respect to the log event.">NEUTRAL</a> or <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcda5707b7b8bf1b098d620552e9576d8061" title="The log event must be logged immediately without consulting with the remaining filters, if any, in the chain.">ACCEPT</a>.</p>
<p>If the value <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcda692e4d49cf7d68c58e78875ae1833fc3" title="The log event must be dropped immediately without consulting with the remaining filters, if any, in the chain.">DENY</a> is returned, then the log event is dropped immediately without consulting with the remaining filters.</p>
<p>If the value <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcdaf46d14eb9d5d71afc9f6e747689fcb56" title="This filter is neutral with respect to the log event.">NEUTRAL</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>
<p>If the value <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcda5707b7b8bf1b098d620552e9576d8061" title="The log event must be logged immediately without consulting with the remaining filters, if any, in the chain.">ACCEPT</a> is returned, then the log event is logged without consulting the remaining filters.</p>
<p>The philosophy of <a class="el" href="namespacelog4cxx.html">log4cxx</a> filters is largely inspired from the Linux ipchains.</p>
<p>Note that filtering is only supported by the <a class="el" href="classlog4cxx_1_1xml_1_1_d_o_m_configurator.html">DOMConfigurator</a>. </p>
</div><hr/><h2>Member Enumeration Documentation</h2>
<a class="anchor" id="a8c8b0cee5b13b164894f9eedd8d78bcd"></a><!-- doxytag: member="log4cxx::spi::Filter::FilterDecision" ref="a8c8b0cee5b13b164894f9eedd8d78bcd" args="" -->
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<td class="memname">enum <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcd">FilterDecision</a></td>
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<dl><dt><b>Enumerator: </b></dt><dd><table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"><em><a class="anchor" id="a8c8b0cee5b13b164894f9eedd8d78bcda692e4d49cf7d68c58e78875ae1833fc3"></a><!-- doxytag: member="DENY" ref="a8c8b0cee5b13b164894f9eedd8d78bcda692e4d49cf7d68c58e78875ae1833fc3" args="" -->DENY</em> </td><td>
<p>The log event must be dropped immediately without consulting with the remaining filters, if any, in the chain. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="a8c8b0cee5b13b164894f9eedd8d78bcdaf46d14eb9d5d71afc9f6e747689fcb56"></a><!-- doxytag: member="NEUTRAL" ref="a8c8b0cee5b13b164894f9eedd8d78bcdaf46d14eb9d5d71afc9f6e747689fcb56" args="" -->NEUTRAL</em> </td><td>
<p>This filter is neutral with respect to the log event. </p>
<p>The remaining filters, if any, should be consulted for a final decision. </p>
</td></tr>
<tr><td valign="top"><em><a class="anchor" id="a8c8b0cee5b13b164894f9eedd8d78bcda5707b7b8bf1b098d620552e9576d8061"></a><!-- doxytag: member="ACCEPT" ref="a8c8b0cee5b13b164894f9eedd8d78bcda5707b7b8bf1b098d620552e9576d8061" args="" -->ACCEPT</em> </td><td>
<p>The log event must be logged immediately without consulting with the remaining filters, if any, in the chain. </p>
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</dd>
</dl>
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<hr/><h2>Constructor & Destructor Documentation</h2>
<a class="anchor" id="ad724ba04cbde6118ceddbd6635e96eaa"></a><!-- doxytag: member="log4cxx::spi::Filter::Filter" ref="ad724ba04cbde6118ceddbd6635e96eaa" args="()" -->
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<td class="memname"><a class="el" href="classlog4cxx_1_1spi_1_1_filter.html">Filter</a> </td>
<td>(</td>
<td class="paramname"></td><td>)</td>
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<hr/><h2>Member Function Documentation</h2>
<a class="anchor" id="aa3df68f8aae152299471992071e202f5"></a><!-- doxytag: member="log4cxx::spi::Filter::activateOptions" ref="aa3df68f8aae152299471992071e202f5" args="(log4cxx::helpers::Pool &p)" -->
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<td class="memname">void activateOptions </td>
<td>(</td>
<td class="paramtype"><a class="el" href="classlog4cxx_1_1helpers_1_1_pool.html">log4cxx::helpers::Pool</a> & </td>
<td class="paramname"><em>p</em></td><td>)</td>
<td><code> [virtual]</code></td>
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<p>Usually filters options become active when set. </p>
<p>We provide a</p>
<p>default do-nothing implementation for convenience. </p>
<p>Implements <a class="el" href="classlog4cxx_1_1spi_1_1_option_handler.html#af04d4bfbd66b46083b1aa042fdafbb06">OptionHandler</a>.</p>
<p>Reimplemented in <a class="el" href="classlog4cxx_1_1filter_1_1_expression_filter.html#aa3df68f8aae152299471992071e202f5">ExpressionFilter</a>, and <a class="el" href="classlog4cxx_1_1filter_1_1_location_info_filter.html#a580abdcb8fd42d07eaf679166f77bc34">LocationInfoFilter</a>.</p>
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<a class="anchor" id="a0198815940c2715c84b0e04828cf8dfa"></a><!-- doxytag: member="log4cxx::spi::Filter::addRef" ref="a0198815940c2715c84b0e04828cf8dfa" args="() const " -->
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<td class="memname">void addRef </td>
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<td class="paramname"></td><td>)</td>
<td> const<code> [virtual]</code></td>
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<p>Reimplemented from <a class="el" href="classlog4cxx_1_1helpers_1_1_object_impl.html#a0198815940c2715c84b0e04828cf8dfa">ObjectImpl</a>.</p>
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<a class="anchor" id="a88283dec47599dde698374489126f01c"></a><!-- doxytag: member="log4cxx::spi::Filter::decide" ref="a88283dec47599dde698374489126f01c" args="(const LoggingEventPtr &event) const =0" -->
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<td class="memname">virtual <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#a8c8b0cee5b13b164894f9eedd8d78bcd">FilterDecision</a> decide </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">LoggingEventPtr</a> & </td>
<td class="paramname"><em>event</em></td><td>)</td>
<td> const<code> [pure virtual]</code></td>
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<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.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table class="params">
<tr><td class="paramname">event</td><td>The <a class="el" href="classlog4cxx_1_1spi_1_1_logging_event.html" title="The internal representation of logging events.">LoggingEvent</a> to decide upon. </td></tr>
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<dl class="return"><dt><b>Returns:</b></dt><dd>The decision of the filter. </dd></dl>
<p>Implemented in <a class="el" href="classlog4cxx_1_1filter_1_1_and_filter.html#af0945cde84b8648b7497a6140e91ac5c">AndFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_deny_all_filter.html#acfc21839a1c2ec66d23e530636c17fca">DenyAllFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_expression_filter.html#af0945cde84b8648b7497a6140e91ac5c">ExpressionFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_level_match_filter.html#af0945cde84b8648b7497a6140e91ac5c">LevelMatchFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_level_range_filter.html#af0945cde84b8648b7497a6140e91ac5c">LevelRangeFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_location_info_filter.html#af0945cde84b8648b7497a6140e91ac5c">LocationInfoFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_map_filter.html#af0945cde84b8648b7497a6140e91ac5c">MapFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_property_filter.html#af0945cde84b8648b7497a6140e91ac5c">PropertyFilter</a>, and <a class="el" href="classlog4cxx_1_1filter_1_1_string_match_filter.html#af0945cde84b8648b7497a6140e91ac5c">StringMatchFilter</a>.</p>
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<a class="anchor" id="ac6ecf1ac8f2f77c59ec5bb44b702de4f"></a><!-- doxytag: member="log4cxx::spi::Filter::getNext" ref="ac6ecf1ac8f2f77c59ec5bb44b702de4f" args="() const " -->
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<td class="memname"><a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">log4cxx::spi::FilterPtr</a> getNext </td>
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<td> const</td>
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<a class="anchor" id="a55c31efee1904916b999395fa4d46a24"></a><!-- doxytag: member="log4cxx::spi::Filter::releaseRef" ref="a55c31efee1904916b999395fa4d46a24" args="() const " -->
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<td class="memname">void releaseRef </td>
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<td class="paramname"></td><td>)</td>
<td> const<code> [virtual]</code></td>
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<p>Reimplemented from <a class="el" href="classlog4cxx_1_1helpers_1_1_object_impl.html#a55c31efee1904916b999395fa4d46a24">ObjectImpl</a>.</p>
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<a class="anchor" id="adb980cf7b7dedc3e2678a5461ccc717e"></a><!-- doxytag: member="log4cxx::spi::Filter::setNext" ref="adb980cf7b7dedc3e2678a5461ccc717e" args="(const log4cxx::spi::FilterPtr &newNext)" -->
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<td class="memname">void setNext </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="classlog4cxx_1_1helpers_1_1_object_ptr_t.html">log4cxx::spi::FilterPtr</a> & </td>
<td class="paramname"><em>newNext</em></td><td>)</td>
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<a class="anchor" id="ac1d269357907e0809687a2bec962e1c8"></a><!-- doxytag: member="log4cxx::spi::Filter::setOption" ref="ac1d269357907e0809687a2bec962e1c8" args="(const LogString &option, const LogString &value)" -->
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<td class="memname">void setOption </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="namespacelog4cxx.html#ad7ec98d27bca7666e23f27dd1fb181c8">LogString</a> & </td>
<td class="paramname"><em>option</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="namespacelog4cxx.html#ad7ec98d27bca7666e23f27dd1fb181c8">LogString</a> & </td>
<td class="paramname"><em>value</em> </td>
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<tr>
<td></td>
<td>)</td>
<td></td><td><code> [virtual]</code></td>
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<div class="memdoc">
<p>Set <code>option</code> to <code>value</code>. </p>
<p>The handling of each option depends on the <a class="el" href="classlog4cxx_1_1spi_1_1_option_handler.html" title="A string based interface to configure package components.">OptionHandler</a> instance. Some options may become active immediately whereas other may be activated only when <a class="el" href="classlog4cxx_1_1spi_1_1_filter.html#aa3df68f8aae152299471992071e202f5" title="Usually filters options become active when set.">activateOptions</a> is called. </p>
<p>Implements <a class="el" href="classlog4cxx_1_1spi_1_1_option_handler.html#a8f2ae2ded63f80c627269c99b20c19ee">OptionHandler</a>.</p>
<p>Reimplemented in <a class="el" href="classlog4cxx_1_1filter_1_1_level_match_filter.html#aee5023c29cca9dc68164b22a01cb7c6e">LevelMatchFilter</a>, <a class="el" href="classlog4cxx_1_1filter_1_1_level_range_filter.html#aee5023c29cca9dc68164b22a01cb7c6e">LevelRangeFilter</a>, and <a class="el" href="classlog4cxx_1_1filter_1_1_string_match_filter.html#aee5023c29cca9dc68164b22a01cb7c6e">StringMatchFilter</a>.</p>
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</div>
<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="filter_8h.html">filter.h</a></li>
</ul>
</div>
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