marvin at rectangular
Feb 26, 2008, 8:19 PM
Post #1 of 1
(687 views)
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Lexicon and PostingList now public
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Greets,
In svn trunk, Lexicon and PostingList are now public classes. So are
the IndexReader factory methods needed to obtain them.
Lexicon is an iterator which supplies a field's unique terms in sorted
order.
my $lexicon = $index_reader->lexicon( field => 'content' );
while ( $lexicon->next ) {
say $lexicon->get_term;
}
PostingList, which is also an iterator, supplies the document numbers
which match a given term.
my $posting_list = $index_reader->posting_list( field =>
'content' );
$posting_list->seek('foo');
while ( my $doc_num = $posting_list->next ) {
say "Matching doc num: $doc_num";
}
The API for the factory methods is slightly different than what was
discussed earlier: they take labeled parameters rather than 1-2
positional arguments.
In both cases, adding a "term" parameter is equivalent to adding a
call to seek().
$lexicon = $index_reader->lexicon(
field => 'content',
term => 'foo',
);
# same as this:
$lexicon = $index_reader->lexicon( field => 'content' );
$lexicon->seek('foo');
$posting_list = $index_reader->posting_list(
field => 'content',
term => 'foo',
);
# same as this:
$posting_list = $index_reader->posting_list( field => 'content' );
$posting_list->seek('foo');
Note that a the "term" argument does not take a
KinoSearch::Index::Term object, but just a string scalar. This may
seem a little confusing, but it will become less confusing soon:
KinoSearch::Index::Term is about to go bye-bye.
Marvin Humphrey
Rectangular Research
http://www.rectangular.com/
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