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<HTML>
<HEAD>
<TITLE>quickstartexpand.cc.html</TITLE>
</HEAD>
<BODY BGcolor=#ffffff TEXT=#000000>
<PRE>
<FONT color=#0000ff>/* quickstartexpand.cc: Simplest possible query expansion
*
* Copyright 2003,2004 Olly Betts
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
* USA
*/</FONT>
<FONT color=#a020f0>#include </FONT><FONT color=#ff00ff><xapian.h></FONT>
<FONT color=#a020f0>#include </FONT><FONT color=#ff00ff><iostream></FONT>
<B><FONT color=#a52a2a>using namespace </FONT></B>std;
<B><FONT color=#2e8b57>int</FONT></B> main(<B><FONT color=#2e8b57>int</FONT></B> argc, <B><FONT color=#2e8b57>char</FONT></B> **argv)
{
<FONT color=#0000ff>// Simplest possible options parsing: we just require two or more
// parameters.</FONT>
<B><FONT color=#a52a2a>if</FONT></B> (argc < <FONT color=#ff00ff>3</FONT>) {
cout << <FONT color=#ff00ff>"usage: "</FONT> << argv[<FONT color=#ff00ff>0</FONT>] <<
<FONT color=#ff00ff>" <path to database> <search terms> -- <relevant docids>"</FONT> <<
endl;
exit(<FONT color=#ff00ff>1</FONT>);
}
<FONT color=#0000ff>// Catch any Xapian::Error exceptions thrown</FONT>
<B><FONT color=#a52a2a>try</FONT></B> {
<FONT color=#0000ff>// Open the database</FONT>
Xapian::Database database(argv[<FONT color=#ff00ff>1</FONT>]);
<FONT color=#0000ff>// Start an enquire session</FONT>
Xapian::Enquire enquire(database);
<FONT color=#0000ff>// Prepare the query terms</FONT>
vector<string> queryterms;
<B><FONT color=#2e8b57>int</FONT></B> optpos;
<B><FONT color=#a52a2a>for</FONT></B> (optpos = <FONT color=#ff00ff>2</FONT>; optpos < argc; optpos++) {
<B><FONT color=#a52a2a>if</FONT></B>(string(argv[optpos]) == <FONT color=#ff00ff>"--"</FONT>) {
optpos++;
<B><FONT color=#a52a2a>break</FONT></B>;
}
queryterms.push_back(argv[optpos]);
}
<FONT color=#0000ff>// Prepare the relevant document list</FONT>
Xapian::RSet reldocs;
<B><FONT color=#a52a2a>for</FONT></B> (; optpos < argc; optpos++) {
Xapian::docid rdid = atoi(argv[optpos]);
<B><FONT color=#a52a2a>if</FONT></B> (rdid != <FONT color=#ff00ff>0</FONT>) {
reldocs.add_document(rdid);
}
}
<FONT color=#0000ff>// Build the query object</FONT>
Xapian::Query query(Xapian::Query::OP_OR, queryterms.begin(), queryterms.end());
Xapian::MSet matches;
<B><FONT color=#a52a2a>if</FONT></B> (query.is_defined()) {
cout << <FONT color=#ff00ff>"Performing query `"</FONT> << query.get_description() <<
<FONT color=#ff00ff>"'"</FONT> << endl;
<FONT color=#0000ff>// Give the query object to the enquire session</FONT>
enquire.set_query(query);
<FONT color=#0000ff>// Get the top 10 results of the query</FONT>
matches = enquire.get_mset(<FONT color=#ff00ff>0</FONT>, <FONT color=#ff00ff>10</FONT>);
<FONT color=#0000ff>// Display the results</FONT>
cout << matches.items.size() << <FONT color=#ff00ff>" results found"</FONT> << endl;
<B><FONT color=#a52a2a>for</FONT></B> (Xapian::MSetIterator i = matches.begin();
i != matches.end();
++i) {
Xapian::Document doc = i.get_document();
cout << <FONT color=#ff00ff>"Document ID "</FONT> << *i << <FONT color=#ff00ff>"</FONT><FONT color=#6a5acd>\t</FONT><FONT color=#ff00ff>"</FONT> <<
i.get_percent() << <FONT color=#ff00ff>"% ["</FONT> <<
doc.get_data() << <FONT color=#ff00ff>"]"</FONT> << endl;
}
}
<FONT color=#0000ff>// Put the top 5 into the rset if rset is empty</FONT>
<B><FONT color=#a52a2a>if</FONT></B> (reldocs.empty()) {
Xapian::MSetIterator i;
<B><FONT color=#2e8b57>int</FONT></B> j;
<B><FONT color=#a52a2a>for</FONT></B> (i = matches.begin(),
j = <FONT color=#ff00ff>0</FONT>;
(i != matches.end()) && (j < <FONT color=#ff00ff>5</FONT>);
++i, ++j) {
reldocs.add_document(*i);
}
}
<FONT color=#0000ff>// Get the suggested expand terms</FONT>
Xapian::ESet eterms = enquire.get_eset(<FONT color=#ff00ff>10</FONT>, reldocs);
<FONT color=#0000ff>// Display the expand terms</FONT>
cout << eterms.size() << <FONT color=#ff00ff>" suggested additional terms"</FONT> << endl;
<B><FONT color=#a52a2a>for</FONT></B> (Xapian::ESetIterator k = eterms.begin();
k != eterms.end();
++k) {
cout << <FONT color=#ff00ff>"Term `"</FONT> << *k << <FONT color=#ff00ff>"'</FONT><FONT color=#6a5acd>\t</FONT><FONT color=#ff00ff> "</FONT> <<
<FONT color=#ff00ff>"(weight "</FONT> << k.get_weight() << <FONT color=#ff00ff>")"</FONT> << endl;
}
} <B><FONT color=#a52a2a>catch</FONT></B>(const Xapian::Error &error) {
cout << <FONT color=#ff00ff>"Exception: "</FONT> << error.get_msg() << endl;
}
}
</PRE>
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