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.\" ========================================================================
.\"
.IX Title "Lucy::Index::PostingList 3pm"
.TH Lucy::Index::PostingList 3pm "2015-03-06" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Lucy::Index::PostingList \- Term\-Document pairings.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 9
\&    my $posting_list_reader 
\&        = $seg_reader\->obtain("Lucy::Index::PostingListReader");
\&    my $posting_list = $posting_list_reader\->posting_list( 
\&        field => \*(Aqcontent\*(Aq,
\&        term  => \*(Aqfoo\*(Aq,
\&    );
\&    while ( my $doc_id = $posting_list\->next ) {
\&        say "Matching doc id: $doc_id";
\&    }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
PostingList is an iterator which supplies a list of document ids that match
a given term.
.PP
See Lucy::Docs::IRTheory for definitions of \*(L"posting\*(R" and \*(L"posting
list\*(R".
.SH "ABSTRACT METHODS"
.IX Header "ABSTRACT METHODS"
.SS "\fInext()\fP"
.IX Subsection "next()"
Proceed to the next doc id.
.PP
Returns: A positive doc id, or 0 once the iterator is exhausted.
.SS "\fIget_doc_id()\fP"
.IX Subsection "get_doc_id()"
Return the current doc id.  Valid only after a successful call to
\&\fInext()\fR or \fIadvance()\fR and must not be called otherwise.
.SS "\fIget_doc_freq()\fP"
.IX Subsection "get_doc_freq()"
Return the number of documents that the PostingList contains.  (This
number will include any documents which have been marked as deleted but
not yet purged.)
.SS "seek(target)"
.IX Subsection "seek(target)"
Prepare the PostingList object to iterate over matches for documents
that match \f(CW\*(C`target\*(C'\fR.
.IP "\(bu" 4
\&\fBtarget\fR \- The term to match.  If undef, the iterator will be empty.
.SH "METHODS"
.IX Header "METHODS"
.SS "advance(target)"
.IX Subsection "advance(target)"
Advance the iterator to the first doc id greater than or equal to
\&\f(CW\*(C`target\*(C'\fR. The default implementation simply calls \fInext()\fR
over and over, but subclasses have the option of doing something more
efficient.
.IP "\(bu" 4
\&\fBtarget\fR \- A positive doc id, which must be greater than the current
doc id once the iterator has been initialized.
.PP
Returns: A positive doc id, or 0 once the iterator is exhausted.
.SH "INHERITANCE"
.IX Header "INHERITANCE"
Lucy::Index::PostingList isa Lucy::Search::Matcher isa Lucy::Object::Obj.