/usr/share/perl5/Plucene/Index/SegmentMerger.pm is in libplucene-perl 1.25-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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=head1 NAME
Plucene::Index::SegmentMerger - the Segment merger
=head1 SYNOPSIS
my $merger = Plucene::Index::SegmentMerger->new();
$merger->add(Plucene::Index::SegmentReader $reader);
$merger->merge;
=head1 DESCRIPTION
This is the segment merger class.
=head1 METHODS
=cut
use strict;
use warnings;
no warnings 'uninitialized';
use File::Slurp;
use Plucene::Index::FieldInfos;
use Plucene::Index::FieldsWriter;
use Plucene::Index::SegmentMergeInfo;
use Plucene::Index::TermInfosWriter;
use Plucene::Index::TermInfo;
use Plucene::Store::OutputStream;
use base 'Class::Accessor::Fast';
__PACKAGE__->mk_accessors(
qw( dir name readers field_infos
freq_output prox_output term_infos_writer queue )
);
=head2 new
my $merger = Plucene::Index::SegmentMerger->new();
This will create a new Plucene::Index::SegmentMerger object.
=cut
sub new { shift->SUPER::new(@_, readers => []) }
=head2 add
$merger->add(Plucene::Index::SegmentReader $reader);
=cut
sub add { push @{ $_[0]->{readers} }, $_[1] }
=head2 segment_reader
=cut
sub segment_reader { $_[0]->{readers}->[ $_[1] ] }
=head2 merge
$merger->merge;
Perform the merging. After the merge, there will be no readers left
stored in the merger object.
=cut
sub merge {
my $self = shift;
$self->_merge_fields();
$self->_merge_terms();
$self->_merge_norms();
$self->{readers} = [];
}
sub _merge_fields {
my $self = shift;
$self->{field_infos} = Plucene::Index::FieldInfos->new();
$self->{field_infos}->add($_->field_infos) for @{ $self->{readers} };
$self->{field_infos}->write("$self->{dir}/$self->{segment}.fnm");
my $fw =
Plucene::Index::FieldsWriter->new($self->{dir}, $self->{segment},
$self->{field_infos});
for my $reader (@{ $self->{readers} }) {
$fw->add_document($_)
foreach map $reader->document($_), grep !$reader->is_deleted($_),
0 .. $reader->max_doc - 1;
}
}
sub _merge_terms {
my $self = shift;
my $segment = $self->{segment};
$self->{term_infos_writer} =
Plucene::Index::TermInfosWriter->new($self->{dir}, $segment,
$self->{field_infos});
my $base = 0;
my @queue;
for my $reader (@{ $self->{readers} }) {
my $smi =
Plucene::Index::SegmentMergeInfo->new($base, $reader->terms, $reader);
$base += $reader->num_docs;
push @queue, $smi if $smi->next;
}
# store every term in every reader/tmp segment in %pool
my %pool;
{
my $index = 0;
foreach my $smi (@queue) {
while (my $term = $smi->term) {
push @{ $pool{ $term->{field} }->{ $term->{text} } },
[ $term, $index, $smi->term_enum->term_info->clone ];
$smi->next;
}
++$index;
}
}
# Now, by sorting our hash, we deal with each term in order:
my (@freqs, @proxs);
foreach my $field (sort keys %pool) {
foreach my $term (sort keys %{ $pool{$field} }) {
my @min = @{ $pool{$field}->{$term} };
my ($fp, $pp) = (scalar(@freqs), scalar(@proxs));
# inlined append_postings
my ($df, $last_doc);
foreach my $item (@min) {
my $smi = $queue[ $item->[1] ];
my $postings = $smi->postings;
my $base = $smi->base;
my $docmap = $smi->doc_map;
$postings->seek($item->[2]);
while ($postings->next) {
my $doc = $base + (
$docmap
? ($docmap->[ $postings->doc ] || 0)
: $postings->doc
);
die "Docs out of order ($doc < $last_doc)" if $doc < $last_doc;
my $doc_code = ($doc - $last_doc) << 1;
$last_doc = $doc;
my $freq = $postings->freq;
push @freqs, ($freq == 1) ? ($doc_code | 1) : ($doc_code, $freq);
my $last_pos = 0;
for (0 .. $freq - 1) {
my $pos = $postings->next_position;
push @proxs, $pos - $last_pos;
$last_pos = $pos;
}
++$df;
}
}
# inlined _merge_term_info
$self->{term_infos_writer}->add(
$min[0]->[0],
Plucene::Index::TermInfo->new({
doc_freq => $df,
freq_pointer => $fp,
prox_pointer => $pp
}));
} # end foreach term
} # end foreach field
write_file("$self->{dir}/$segment.frq" => pack('(w)*', @freqs));
write_file("$self->{dir}/$segment.prx" => pack('(w)*', @proxs));
$self->{term_infos_writer}->break_ref;
}
sub _merge_norms {
my $self = shift;
my @fields = $self->{field_infos}->fields;
for (0 .. $#fields) {
my $fi = $fields[$_];
next unless $fi->is_indexed;
my $output =
Plucene::Store::OutputStream->new(my $file =
"$self->{dir}/$self->{segment}.f$_");
for my $reader (@{ $self->{readers} }) {
my $input = $reader->norm_stream($fi->name);
for (0 .. $reader->max_doc - 1) {
$output->print(chr($input ? $input->read_byte : 0))
unless $reader->is_deleted($_);
}
}
}
}
1;
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