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Appender (Apache Log4j 1.2.17 API)
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org.apache.log4j</FONT>
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Interface Appender</H2>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../org/apache/log4j/AppenderSkeleton.html" title="class in org.apache.log4j">AppenderSkeleton</A>, <A HREF="../../../org/apache/log4j/AsyncAppender.html" title="class in org.apache.log4j">AsyncAppender</A>, <A HREF="../../../org/apache/log4j/ConsoleAppender.html" title="class in org.apache.log4j">ConsoleAppender</A>, <A HREF="../../../org/apache/log4j/DailyRollingFileAppender.html" title="class in org.apache.log4j">DailyRollingFileAppender</A>, <A HREF="../../../org/apache/log4j/varia/ExternallyRolledFileAppender.html" title="class in org.apache.log4j.varia">ExternallyRolledFileAppender</A>, <A HREF="../../../org/apache/log4j/FileAppender.html" title="class in org.apache.log4j">FileAppender</A>, <A HREF="../../../org/apache/log4j/jdbc/JDBCAppender.html" title="class in org.apache.log4j.jdbc">JDBCAppender</A>, <A HREF="../../../org/apache/log4j/net/JMSAppender.html" title="class in org.apache.log4j.net">JMSAppender</A>, <A HREF="../../../org/apache/log4j/lf5/LF5Appender.html" title="class in org.apache.log4j.lf5">LF5Appender</A>, <A HREF="../../../org/apache/log4j/nt/NTEventLogAppender.html" title="class in org.apache.log4j.nt">NTEventLogAppender</A>, <A HREF="../../../org/apache/log4j/varia/NullAppender.html" title="class in org.apache.log4j.varia">NullAppender</A>, <A HREF="../../../org/apache/log4j/rewrite/RewriteAppender.html" title="class in org.apache.log4j.rewrite">RewriteAppender</A>, <A HREF="../../../org/apache/log4j/RollingFileAppender.html" title="class in org.apache.log4j">RollingFileAppender</A>, <A HREF="../../../org/apache/log4j/net/SMTPAppender.html" title="class in org.apache.log4j.net">SMTPAppender</A>, <A HREF="../../../org/apache/log4j/net/SocketAppender.html" title="class in org.apache.log4j.net">SocketAppender</A>, <A HREF="../../../org/apache/log4j/net/SocketHubAppender.html" title="class in org.apache.log4j.net">SocketHubAppender</A>, <A HREF="../../../org/apache/log4j/net/SyslogAppender.html" title="class in org.apache.log4j.net">SyslogAppender</A>, <A HREF="../../../org/apache/log4j/net/TelnetAppender.html" title="class in org.apache.log4j.net">TelnetAppender</A>, <A HREF="../../../org/apache/log4j/WriterAppender.html" title="class in org.apache.log4j">WriterAppender</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public interface <B>Appender</B></DL>
</PRE>
<P>
Implement this interface for your own strategies for outputting log
statements.
<P>
<P>
<DL>
<DT><B>Author:</B></DT>
<DD>Ceki G&uuml;lc&uuml;</DD>
</DL>
<HR>
<P>
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<B>Method Summary</B></FONT></TH>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#addFilter(org.apache.log4j.spi.Filter)">addFilter</A></B>(<A HREF="../../../org/apache/log4j/spi/Filter.html" title="class in org.apache.log4j.spi">Filter</A>&nbsp;newFilter)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Add a filter to the end of the filter list.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#clearFilters()">clearFilters</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Clear the list of filters by removing all the filters in it.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#close()">close</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Release any resources allocated within the appender such as file
handles, network connections, etc.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#doAppend(org.apache.log4j.spi.LoggingEvent)">doAppend</A></B>(<A HREF="../../../org/apache/log4j/spi/LoggingEvent.html" title="class in org.apache.log4j.spi">LoggingEvent</A>&nbsp;event)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Log in <code>Appender</code> specific way.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../org/apache/log4j/spi/ErrorHandler.html" title="interface in org.apache.log4j.spi">ErrorHandler</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#getErrorHandler()">getErrorHandler</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the <A HREF="../../../org/apache/log4j/spi/ErrorHandler.html" title="interface in org.apache.log4j.spi"><CODE>ErrorHandler</CODE></A> for this appender.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../org/apache/log4j/spi/Filter.html" title="class in org.apache.log4j.spi">Filter</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#getFilter()">getFilter</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the head Filter.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../org/apache/log4j/Layout.html" title="class in org.apache.log4j">Layout</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#getLayout()">getLayout</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns this appenders layout.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#getName()">getName</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the name of this appender.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#requiresLayout()">requiresLayout</A></B>()</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Configurators call this method to determine if the appender
requires a layout.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#setErrorHandler(org.apache.log4j.spi.ErrorHandler)">setErrorHandler</A></B>(<A HREF="../../../org/apache/log4j/spi/ErrorHandler.html" title="interface in org.apache.log4j.spi">ErrorHandler</A>&nbsp;errorHandler)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the <A HREF="../../../org/apache/log4j/spi/ErrorHandler.html" title="interface in org.apache.log4j.spi"><CODE>ErrorHandler</CODE></A> for this appender.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#setLayout(org.apache.log4j.Layout)">setLayout</A></B>(<A HREF="../../../org/apache/log4j/Layout.html" title="class in org.apache.log4j">Layout</A>&nbsp;layout)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the <A HREF="../../../org/apache/log4j/Layout.html" title="class in org.apache.log4j"><CODE>Layout</CODE></A> for this appender.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../org/apache/log4j/Appender.html#setName(java.lang.String)">setName</A></B>(<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;name)</CODE>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set the name of this appender.</TD>
</TR>
</TABLE>
&nbsp;
<P>
<!-- ============ METHOD DETAIL ========== -->
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<B>Method Detail</B></FONT></TH>
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<A NAME="addFilter(org.apache.log4j.spi.Filter)"><!-- --></A><H3>
addFilter</H3>
<PRE>
void <B>addFilter</B>(<A HREF="../../../org/apache/log4j/spi/Filter.html" title="class in org.apache.log4j.spi">Filter</A>&nbsp;newFilter)</PRE>
<DL>
<DD>Add a filter to the end of the filter list.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>0.9.0</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getFilter()"><!-- --></A><H3>
getFilter</H3>
<PRE>
<A HREF="../../../org/apache/log4j/spi/Filter.html" title="class in org.apache.log4j.spi">Filter</A> <B>getFilter</B>()</PRE>
<DL>
<DD>Returns the head Filter. The Filters are organized in a linked list
and so all Filters on this Appender are available through the result.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the head Filter or null, if no Filters are present<DT><B>Since:</B></DT>
<DD>1.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="clearFilters()"><!-- --></A><H3>
clearFilters</H3>
<PRE>
void <B>clearFilters</B>()</PRE>
<DL>
<DD>Clear the list of filters by removing all the filters in it.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>0.9.0</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
void <B>close</B>()</PRE>
<DL>
<DD>Release any resources allocated within the appender such as file
handles, network connections, etc.
<p>It is a programming error to append to a closed appender.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>0.8.4</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="doAppend(org.apache.log4j.spi.LoggingEvent)"><!-- --></A><H3>
doAppend</H3>
<PRE>
void <B>doAppend</B>(<A HREF="../../../org/apache/log4j/spi/LoggingEvent.html" title="class in org.apache.log4j.spi">LoggingEvent</A>&nbsp;event)</PRE>
<DL>
<DD>Log in <code>Appender</code> specific way. When appropriate,
Loggers will call the <code>doAppend</code> method of appender
implementations in order to log.
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>
<A NAME="getName()"><!-- --></A><H3>
getName</H3>
<PRE>
<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <B>getName</B>()</PRE>
<DL>
<DD>Get the name of this appender.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>name, may be null.</DL>
</DD>
</DL>
<HR>
<A NAME="setErrorHandler(org.apache.log4j.spi.ErrorHandler)"><!-- --></A><H3>
setErrorHandler</H3>
<PRE>
void <B>setErrorHandler</B>(<A HREF="../../../org/apache/log4j/spi/ErrorHandler.html" title="interface in org.apache.log4j.spi">ErrorHandler</A>&nbsp;errorHandler)</PRE>
<DL>
<DD>Set the <A HREF="../../../org/apache/log4j/spi/ErrorHandler.html" title="interface in org.apache.log4j.spi"><CODE>ErrorHandler</CODE></A> for this appender.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>0.9.0</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getErrorHandler()"><!-- --></A><H3>
getErrorHandler</H3>
<PRE>
<A HREF="../../../org/apache/log4j/spi/ErrorHandler.html" title="interface in org.apache.log4j.spi">ErrorHandler</A> <B>getErrorHandler</B>()</PRE>
<DL>
<DD>Returns the <A HREF="../../../org/apache/log4j/spi/ErrorHandler.html" title="interface in org.apache.log4j.spi"><CODE>ErrorHandler</CODE></A> for this appender.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>1.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="setLayout(org.apache.log4j.Layout)"><!-- --></A><H3>
setLayout</H3>
<PRE>
void <B>setLayout</B>(<A HREF="../../../org/apache/log4j/Layout.html" title="class in org.apache.log4j">Layout</A>&nbsp;layout)</PRE>
<DL>
<DD>Set the <A HREF="../../../org/apache/log4j/Layout.html" title="class in org.apache.log4j"><CODE>Layout</CODE></A> for this appender.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>0.8.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="getLayout()"><!-- --></A><H3>
getLayout</H3>
<PRE>
<A HREF="../../../org/apache/log4j/Layout.html" title="class in org.apache.log4j">Layout</A> <B>getLayout</B>()</PRE>
<DL>
<DD>Returns this appenders layout.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>1.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="setName(java.lang.String)"><!-- --></A><H3>
setName</H3>
<PRE>
void <B>setName</B>(<A HREF="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>&nbsp;name)</PRE>
<DL>
<DD>Set the name of this appender. The name is used by other
components to identify this appender.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>0.8.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="requiresLayout()"><!-- --></A><H3>
requiresLayout</H3>
<PRE>
boolean <B>requiresLayout</B>()</PRE>
<DL>
<DD>Configurators call this method to determine if the appender
requires a layout. If this method returns <code>true</code>,
meaning that layout is required, then the configurator will
configure an layout using the configuration information at its
disposal. If this method returns <code>false</code>, meaning that
a layout is not required, then layout configuration will be
skipped even if there is available layout configuration
information at the disposal of the configurator..
<p>In the rather exceptional case, where the appender
implementation admits a layout but can also work without it, then
the appender should return <code>true</code>.
<P>
<DD><DL>
<DT><B>Since:</B></DT>
<DD>0.8.4</DD>
</DL>
</DD>
</DL>
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