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Appender (Apache Log4j 1.x Compatibility API 2.2 API)
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org.apache.log4j</FONT>
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Interface Appender</H2>
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<DL>
<DT><PRE>public interface <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.27"><B>Appender</B></A></DL>
</PRE>
<P>
Implement this interface for your own strategies for outputting log
statements.
<P>
<P>
<HR>
<P>
<!-- ========== METHOD SUMMARY =========== -->
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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://docs.oracle.com/javase/6/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://docs.oracle.com/javase/6/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>
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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 <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.35"><B>addFilter</B></A>(<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>Parameters:</B><DD><CODE>newFilter</CODE> - The filter to add.<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> <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.44"><B>getFilter</B></A>()</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 <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.51"><B>clearFilters</B></A>()</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 <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.62"><B>close</B></A>()</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>
<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 <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.70"><B>doAppend</B></A>(<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>
<DT><B>Parameters:</B><DD><CODE>event</CODE> - The LoggingEvent.</DL>
</DD>
</DL>
<HR>
<A NAME="getName()"><!-- --></A><H3>
getName</H3>
<PRE>
<A HREF="http://docs.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A> <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.78"><B>getName</B></A>()</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 <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.87"><B>setErrorHandler</B></A>(<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>Parameters:</B><DD><CODE>errorHandler</CODE> - The error handler.<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> <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.95"><B>getErrorHandler</B></A>()</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>Returns:</B><DD>The error handler.<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 <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.103"><B>setLayout</B></A>(<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>Parameters:</B><DD><CODE>layout</CODE> - The Layout.<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> <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.111"><B>getLayout</B></A>()</PRE>
<DL>
<DD>Returns this appenders layout.
<P>
<DD><DL>
<DT><B>Returns:</B><DD>the Layout.<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 <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.121"><B>setName</B></A>(<A HREF="http://docs.oracle.com/javase/6/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>Parameters:</B><DD><CODE>name</CODE> - The appender name.<DT><B>Since:</B></DT>
<DD>0.8.1</DD>
</DL>
</DD>
</DL>
<HR>
<A NAME="requiresLayout()"><!-- --></A><H3>
requiresLayout</H3>
<PRE>
boolean <A HREF="../../../src-html/org/apache/log4j/Appender.html#line.141"><B>requiresLayout</B></A>()</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>
<P>
<DD><DL>
<DT><B>Returns:</B><DD>true if a Layout is required.<DT><B>Since:</B></DT>
<DD>0.8.4</DD>
</DL>
</DD>
</DL>
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