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PortletFilter (Java Portlet Specification V2.0 1.0 API)
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javax.portlet.filter</FONT>
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Interface PortletFilter</H2>
<DL>
<DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../javax/portlet/filter/ActionFilter.html" title="interface in javax.portlet.filter">ActionFilter</A>, <A HREF="../../../javax/portlet/filter/EventFilter.html" title="interface in javax.portlet.filter">EventFilter</A>, <A HREF="../../../javax/portlet/filter/RenderFilter.html" title="interface in javax.portlet.filter">RenderFilter</A>, <A HREF="../../../javax/portlet/filter/ResourceFilter.html" title="interface in javax.portlet.filter">ResourceFilter</A></DD>
</DL>
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<DT><PRE>public interface <B>PortletFilter</B></DL>
</PRE>
<P>
The <code>PortletFilter</code> is the base interface for all portlet filters.
It provides the lifecycle methods <code>init</code> and <code>destroy</code>
for putting a portlet filter into and out of service.
<P>
<P>
<DL>
<DT><B>Since:</B></DT>
<DD>2.0</DD>
</DL>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/portlet/filter/PortletFilter.html#destroy()">destroy</A></B>()</CODE>
<BR>
Called by the portlet container to indicate to a filter that it is
being taken out of service.</TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/portlet/filter/PortletFilter.html#init(javax.portlet.filter.FilterConfig)">init</A></B>(<A HREF="../../../javax/portlet/filter/FilterConfig.html" title="interface in javax.portlet.filter">FilterConfig</A> filterConfig)</CODE>
<BR>
Called by the portlet container to indicate to a filter
that it is being placed into service.</TD>
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<A NAME="init(javax.portlet.filter.FilterConfig)"><!-- --></A><H3>
init</H3>
<PRE>
void <B>init</B>(<A HREF="../../../javax/portlet/filter/FilterConfig.html" title="interface in javax.portlet.filter">FilterConfig</A> filterConfig)
throws <A HREF="../../../javax/portlet/PortletException.html" title="class in javax.portlet">PortletException</A></PRE>
<DL>
<DD>Called by the portlet container to indicate to a filter
that it is being placed into service. The portlet container
calls the init method exactly once after instantiating the filter.
The init method must complete successfully before the filter
is asked to do any filtering work.
<p>
The portlet container cannot place the filter into service if the init method either
<ul>
<li>throws a PortletException</li>
<li>does not return within a time period defined by the portlet container</li>
</ul>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>filterConfig</CODE> - the filter configuration data defined
in the portlet deployment descriptor
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../javax/portlet/PortletException.html" title="class in javax.portlet">PortletException</A></CODE> - if an error occurs in the filter initialization</DL>
</DD>
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<A NAME="destroy()"><!-- --></A><H3>
destroy</H3>
<PRE>
void <B>destroy</B>()</PRE>
<DL>
<DD>Called by the portlet container to indicate to a filter that it is
being taken out of service. This method is only called once all threads
within the filter's <code>doFilter</code> method have exited or
after a timeout period has passed.
<p>
After the portlet container calls this method, it will not call the
<code>doFilter</code> method again on this instance of the filter.
<p>
This method gives the filter an opportunity to clean up any resources
that are being held (for example, memory, file handles, threads) and
make sure that any persistent state is synchronized with the
filter's current state in memory.
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