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<HTML>
<HEAD>
<TITLE>WWW::Search::Crawler - class for searching Crawler</TITLE>
<LINK REL="stylesheet" HREF="../../../../Active.css" TYPE="text/css">
<LINK REV="made" HREF="mailto:">
</HEAD>
<BODY>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> WWW::Search::Crawler - class for searching Crawler</P></STRONG>
</TD></TR>
</TABLE>
<A NAME="__index__"></A>
<!-- INDEX BEGIN -->
<UL>
<LI><A HREF="#name">NAME</A></LI><LI><A HREF="#supportedplatforms">SUPPORTED PLATFORMS</A></LI>
<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
<LI><A HREF="#description">DESCRIPTION</A></LI>
<LI><A HREF="#see also">SEE ALSO</A></LI>
<LI><A HREF="#how does it work">HOW DOES IT WORK?</A></LI>
<LI><A HREF="#author">AUTHOR</A></LI>
<LI><A HREF="#copyright">COPYRIGHT</A></LI>
</UL>
<!-- INDEX END -->
<HR>
<P>
<H1><A NAME="name">NAME</A></H1>
<P>WWW::Search::Crawler - class for searching Crawler</P>
<P>
<HR>
<H1><A NAME="supportedplatforms">SUPPORTED PLATFORMS</A></H1>
<UL>
<LI>Linux</LI>
<LI>Solaris</LI>
<LI>Windows</LI>
</UL>
<HR>
<H1><A NAME="synopsis">SYNOPSIS</A></H1>
<PRE>
require WWW::Search;
$search = new WWW::Search('Crawler');</PRE>
<P>
<HR>
<H1><A NAME="description">DESCRIPTION</A></H1>
<P>This class is an Crawler specialization of WWW::Search.
It handles making and interpreting Fireball searches
<EM><A HREF="http://www.crawler.de">http://www.crawler.de</A></EM>.</P>
<P>This class exports no public interface; all interaction should
be done through WWW::Search objects.</P>
<P>
<HR>
<H1><A NAME="see also">SEE ALSO</A></H1>
<P>To make new back-ends, see <A HREF="../../../../site/lib/WWW/Search.html">the WWW::Search manpage</A>.</P>
<P>
<HR>
<H1><A NAME="how does it work">HOW DOES IT WORK?</A></H1>
<P><CODE>native_setup_search</CODE> is called before we do anything.
It initializes our private variables (which all begin with underscores)
and sets up a URL to the first results page in <CODE>{_next_url}</CODE>.</P>
<P><CODE>native_retrieve_some</CODE> is called (from <CODE>WWW::Search::retrieve_some</CODE>)
whenever more hits are needed. It calls the LWP library
to fetch the page specified by <CODE>{_next_url}</CODE>.
It parses this page, appending any search hits it finds to
<CODE>{cache}</CODE>. If it finds a ``next'' button in the text,
it sets <CODE>{_next_url}</CODE> to point to the page for the next
set of results, otherwise it sets it to undef to indicate we're done.</P>
<P>
<HR>
<H1><A NAME="author">AUTHOR</A></H1>
<P><CODE>WWW::Search::Crawler</CODE> has been shamelessly copied by
Andreas Borchert, <<A HREF="mailto:borchert@mathematik.uni-ulm.de">borchert@mathematik.uni-ulm.de</A>> from
<CODE>WWW::Search::AltaVista</CODE> by John Heidemann, <<A HREF="mailto:johnh@isi.edu">johnh@isi.edu</A>>.</P>
<P>
<HR>
<H1><A NAME="copyright">COPYRIGHT</A></H1>
<P>The original parts from John Heidemann are subject to
following copyright notice:</P>
<P>Copyright (c) 1996-1998 University of Southern California.
All rights reserved.
</P>
<PRE>
Redistribution and use in source and binary forms are permitted
provided that the above copyright notice and this paragraph are
duplicated in all such forms and that any documentation, advertising
materials, and other materials related to such distribution and use
acknowledge that the software was developed by the University of
Southern California, Information Sciences Institute. The name of the
University may not be used to endorse or promote products derived from
this software without specific prior written permission.</PRE>
<P>THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.</P>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> WWW::Search::Crawler - class for searching Crawler</P></STRONG>
</TD></TR>
</TABLE>
</BODY>
</HTML>