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package WebPAC::Input; |
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use warnings; |
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use strict; |
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use blib; |
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use WebPAC::Common; |
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use base qw/WebPAC::Common/; |
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use Data::Dumper; |
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use Encode qw/from_to/; |
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=head1 NAME |
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WebPAC::Input - read different file formats into WebPAC |
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=head1 VERSION |
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Version 0.11 |
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=cut |
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our $VERSION = '0.11'; |
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=head1 SYNOPSIS |
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This module implements input as database which have fixed and known |
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I<size> while indexing and single unique numeric identifier for database |
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position ranging from 1 to I<size>. |
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Simply, something that is indexed by unmber from 1 .. I<size>. |
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Examples of such databases are CDS/ISIS files, MARC files, lines in |
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text file, and so on. |
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Specific file formats are implemented using low-level interface modules, |
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located in C<WebPAC::Input::*> namespace which export C<open_db>, |
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C<fetch_rec> and optional C<init> functions. |
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Perhaps a little code snippet. |
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use WebPAC::Input; |
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my $db = WebPAC::Input->new( |
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module => 'WebPAC::Input::ISIS', |
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low_mem => 1, |
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); |
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$db->open( path => '/path/to/database' ); |
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print "database size: ",$db->size,"\n"; |
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while (my $rec = $db->fetch) { |
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# do something with $rec |
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} |
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=head1 FUNCTIONS |
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=head2 new |
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Create new input database object. |
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my $db = new WebPAC::Input( |
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module => 'WebPAC::Input::MARC', |
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encoding => 'ISO-8859-2', |
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low_mem => 1, |
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recode => 'char pairs', |
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no_progress_bar => 1, |
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); |
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|
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C<module> is low-level file format module. See L<WebPAC::Input::ISIS> and |
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L<WebPAC::Input::MARC>. |
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Optional parametar C<encoding> specify application code page (which will be |
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used internally). This should probably be your terminal encoding, and by |
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default, it C<ISO-8859-2>. |
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Default is not to use C<low_mem> options (see L<MEMORY USAGE> below). |
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C<recode> is optional string constisting of character or words pairs that |
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should be replaced in input stream. |
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C<no_progress_bar> disables progress bar output on C<STDOUT> |
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This function will also call low-level C<init> if it exists with same |
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parametars. |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = {@_}; |
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bless($self, $class); |
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my $log = $self->_get_logger; |
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$log->logconfess("code_page argument is not suppored any more. change it to encoding") if ($self->{lookup}); |
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$log->logconfess("lookup argument is not suppored any more. rewrite call to lookup_ref") if ($self->{lookup}); |
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$log->logconfess("specify low-level file format module") unless ($self->{module}); |
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my $module = $self->{module}; |
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$module =~ s#::#/#g; |
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$module .= '.pm'; |
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$log->debug("require low-level module $self->{module} from $module"); |
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require $module; |
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#eval $self->{module} .'->import'; |
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|
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# check if required subclasses are implemented |
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foreach my $subclass (qw/open_db fetch_rec init/) { |
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my $n = $self->{module} . '::' . $subclass; |
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if (! defined &{ $n }) { |
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my $missing = "missing $subclass in $self->{module}"; |
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$self->{$subclass} = sub { $log->logwarn($missing) }; |
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} else { |
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$self->{$subclass} = \&{ $n }; |
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} |
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} |
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if ($self->{init}) { |
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$log->debug("calling init"); |
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$self->{init}->($self, @_); |
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} |
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$self->{'encoding'} ||= 'ISO-8859-2'; |
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# running with low_mem flag? well, use DBM::Deep then. |
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if ($self->{'low_mem'}) { |
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$log->info("running with low_mem which impacts performance (<32 Mb memory usage)"); |
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my $db_file = "data.db"; |
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if (-e $db_file) { |
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unlink $db_file or $log->logdie("can't remove '$db_file' from last run"); |
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$log->debug("removed '$db_file' from last run"); |
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} |
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require DBM::Deep; |
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my $db = new DBM::Deep $db_file; |
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$log->logdie("DBM::Deep error: $!") unless ($db); |
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if ($db->error()) { |
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$log->logdie("can't open '$db_file' under low_mem: ",$db->error()); |
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} else { |
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$log->debug("using file '$db_file' for DBM::Deep"); |
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} |
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$self->{'db'} = $db; |
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} |
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$self ? return $self : return undef; |
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} |
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=head2 open |
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This function will read whole database in memory and produce lookups. |
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$input->open( |
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path => '/path/to/database/file', |
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code_page => 'cp852', |
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limit => 500, |
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offset => 6000, |
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lookup => $lookup_obj, |
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stats => 1, |
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lookup_ref => sub { |
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my ($k,$v) = @_; |
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# store lookup $k => $v |
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}, |
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modify_records => { |
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900 => { '^a' => { ' : ' => '^b' } }, |
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901 => { '*' => { '^b' => ' ; ' } }, |
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}, |
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); |
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By default, C<code_page> is assumed to be C<cp852>. |
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C<offset> is optional parametar to position at some offset before reading from database. |
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C<limit> is optional parametar to read just C<limit> records from database |
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C<stats> create optional report about usage of fields and subfields |
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C<lookup_coderef> is closure to call when adding C<< key => 'value' >> combinations to |
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lookup. |
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C<modify_records> specify mapping from subfields to delimiters or from |
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delimiters to subfields, as well as oprations on fields (if subfield is |
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defined as C<*>. |
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Returns size of database, regardless of C<offset> and C<limit> |
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parametars, see also C<size>. |
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=cut |
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sub open { |
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my $self = shift; |
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my $arg = {@_}; |
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my $log = $self->_get_logger(); |
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$log->logconfess("lookup argument is not suppored any more. rewrite call to lookup_coderef") if ($arg->{lookup}); |
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$log->logconfess("lookup_coderef must be CODE, not ",ref($arg->{lookup_coderef})) |
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if ($arg->{lookup_coderef} && ref($arg->{lookup_coderef}) ne 'CODE'); |
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$log->logcroak("need path") if (! $arg->{'path'}); |
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my $code_page = $arg->{'code_page'} || 'cp852'; |
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# store data in object |
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$self->{'input_code_page'} = $code_page; |
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foreach my $v (qw/path offset limit/) { |
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$self->{$v} = $arg->{$v} if ($arg->{$v}); |
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} |
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my $filter_ref; |
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my $recode_regex; |
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my $recode_map; |
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if ($self->{recode}) { |
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my @r = split(/\s/, $self->{recode}); |
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if ($#r % 2 != 1) { |
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$log->logwarn("recode needs even number of elements (some number of valid pairs)"); |
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} else { |
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while (@r) { |
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my $from = shift @r; |
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my $to = shift @r; |
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$recode_map->{$from} = $to; |
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} |
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$recode_regex = join '|' => keys %{ $recode_map }; |
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$log->debug("using recode regex: $recode_regex"); |
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} |
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} |
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my $rec_regex = $self->modify_record_regexps(%{ $arg->{modify_records} }); |
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$log->debug("rec_regex: ", Dumper($rec_regex)); |
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my ($db, $size) = $self->{open_db}->( $self, |
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path => $arg->{path}, |
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# filter => sub { |
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# my ($l,$f_nr) = @_; |
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# return unless defined($l); |
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# from_to($l, $code_page, $self->{'encoding'}); |
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# $l =~ s/($recode_regex)/$recode_map->{$1}/g if ($recode_regex && $recode_map); |
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# return $l; |
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# }, |
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%{ $arg }, |
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); |
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unless (defined($db)) { |
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$log->logwarn("can't open database $arg->{path}, skipping..."); |
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return; |
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} |
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unless ($size) { |
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$log->logwarn("no records in database $arg->{path}, skipping..."); |
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return; |
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} |
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my $from_rec = 1; |
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my $to_rec = $size; |
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if (my $s = $self->{offset}) { |
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$log->debug("skipping to MFN $s"); |
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$from_rec = $s; |
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} else { |
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$self->{offset} = $from_rec; |
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} |
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if ($self->{limit}) { |
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$log->debug("limiting to ",$self->{limit}," records"); |
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$to_rec = $from_rec + $self->{limit} - 1; |
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$to_rec = $size if ($to_rec > $size); |
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} |
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# store size for later |
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$self->{size} = ($to_rec - $from_rec) ? ($to_rec - $from_rec + 1) : 0; |
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$log->info("processing $self->{size}/$size records [$from_rec-$to_rec] convert $code_page -> $self->{encoding}", $self->{stats} ? ' [stats]' : ''); |
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# read database |
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for (my $pos = $from_rec; $pos <= $to_rec; $pos++) { |
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$log->debug("position: $pos\n"); |
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my $rec = $self->{fetch_rec}->($self, $db, $pos, sub { |
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my ($l,$f_nr) = @_; |
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# return unless defined($l); |
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# return $l unless ($rec_regex && $f_nr); |
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$log->debug("-=> $f_nr ## $l"); |
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# codepage conversion and recode_regex |
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# from_to($l, $code_page, $self->{'encoding'}); |
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from_to($l, $code_page, 'utf-8'); |
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$l =~ s/($recode_regex)/$recode_map->{$1}/g if ($recode_regex && $recode_map); |
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# apply regexps |
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if ($rec_regex && defined($rec_regex->{$f_nr})) { |
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$log->logconfess("regexps->{$f_nr} must be ARRAY") if (ref($rec_regex->{$f_nr}) ne 'ARRAY'); |
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my $c = 0; |
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foreach my $r (@{ $rec_regex->{$f_nr} }) { |
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#$log->debug("\$l = $l\neval \$l =~ $r"); |
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eval '$l =~ ' . $r; |
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$log->error("error applying regex: $r") if ($@); |
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} |
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} |
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$log->debug("<=- $f_nr ## $l"); |
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return $l; |
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}); |
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$log->debug(sub { Dumper($rec) }); |
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if (! $rec) { |
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$log->warn("record $pos empty? skipping..."); |
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next; |
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} |
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# store |
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if ($self->{low_mem}) { |
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$self->{db}->put($pos, $rec); |
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} else { |
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$self->{data}->{$pos} = $rec; |
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} |
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# create lookup |
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$arg->{'lookup_coderef'}->( $rec ) if ($rec && $arg->{'lookup_coderef'}); |
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# update counters for statistics |
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if ($self->{stats}) { |
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# fetch clean record with regexpes applied for statistics |
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my $rec = $self->{fetch_rec}->($self, $db, $pos); |
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foreach my $fld (keys %{ $rec }) { |
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$self->{_stats}->{fld}->{ $fld }++; |
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$log->logdie("invalid record fild $fld, not ARRAY") |
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unless (ref($rec->{ $fld }) eq 'ARRAY'); |
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foreach my $row (@{ $rec->{$fld} }) { |
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if (ref($row) eq 'HASH') { |
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foreach my $sf (keys %{ $row }) { |
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next if ($sf eq 'subfields'); |
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$self->{_stats}->{sf}->{ $fld }->{ $sf }->{count}++; |
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$self->{_stats}->{sf}->{ $fld }->{ $sf }->{repeatable}++ |
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if (ref($row->{$sf}) eq 'ARRAY'); |
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} |
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} else { |
357 |
|
|
$self->{_stats}->{repeatable}->{ $fld }++; |
358 |
|
|
} |
359 |
dpavlin |
506 |
} |
360 |
dpavlin |
593 |
} |
361 |
dpavlin |
506 |
} |
362 |
|
|
|
363 |
dpavlin |
483 |
$self->progress_bar($pos,$to_rec) unless ($self->{no_progress_bar}); |
364 |
dpavlin |
285 |
|
365 |
|
|
} |
366 |
|
|
|
367 |
dpavlin |
286 |
$self->{pos} = -1; |
368 |
|
|
$self->{last_pcnt} = 0; |
369 |
dpavlin |
285 |
|
370 |
|
|
# store max mfn and return it. |
371 |
dpavlin |
339 |
$self->{max_pos} = $to_rec; |
372 |
|
|
$log->debug("max_pos: $to_rec"); |
373 |
dpavlin |
285 |
|
374 |
|
|
return $size; |
375 |
|
|
} |
376 |
|
|
|
377 |
|
|
=head2 fetch |
378 |
|
|
|
379 |
|
|
Fetch next record from database. It will also displays progress bar. |
380 |
|
|
|
381 |
|
|
my $rec = $isis->fetch; |
382 |
|
|
|
383 |
|
|
Record from this function should probably go to C<data_structure> for |
384 |
|
|
normalisation. |
385 |
|
|
|
386 |
|
|
=cut |
387 |
|
|
|
388 |
|
|
sub fetch { |
389 |
|
|
my $self = shift; |
390 |
|
|
|
391 |
|
|
my $log = $self->_get_logger(); |
392 |
|
|
|
393 |
dpavlin |
286 |
$log->logconfess("it seems that you didn't load database!") unless ($self->{pos}); |
394 |
dpavlin |
285 |
|
395 |
dpavlin |
286 |
if ($self->{pos} == -1) { |
396 |
|
|
$self->{pos} = $self->{offset}; |
397 |
dpavlin |
285 |
} else { |
398 |
dpavlin |
286 |
$self->{pos}++; |
399 |
dpavlin |
285 |
} |
400 |
|
|
|
401 |
dpavlin |
286 |
my $mfn = $self->{pos}; |
402 |
dpavlin |
285 |
|
403 |
dpavlin |
286 |
if ($mfn > $self->{max_pos}) { |
404 |
|
|
$self->{pos} = $self->{max_pos}; |
405 |
dpavlin |
285 |
$log->debug("at EOF"); |
406 |
|
|
return; |
407 |
|
|
} |
408 |
|
|
|
409 |
dpavlin |
483 |
$self->progress_bar($mfn,$self->{max_pos}) unless ($self->{no_progress_bar}); |
410 |
dpavlin |
285 |
|
411 |
|
|
my $rec; |
412 |
|
|
|
413 |
dpavlin |
286 |
if ($self->{low_mem}) { |
414 |
|
|
$rec = $self->{db}->get($mfn); |
415 |
dpavlin |
285 |
} else { |
416 |
dpavlin |
286 |
$rec = $self->{data}->{$mfn}; |
417 |
dpavlin |
285 |
} |
418 |
|
|
|
419 |
|
|
$rec ||= 0E0; |
420 |
|
|
} |
421 |
|
|
|
422 |
|
|
=head2 pos |
423 |
|
|
|
424 |
|
|
Returns current record number (MFN). |
425 |
|
|
|
426 |
|
|
print $isis->pos; |
427 |
|
|
|
428 |
|
|
First record in database has position 1. |
429 |
|
|
|
430 |
|
|
=cut |
431 |
|
|
|
432 |
|
|
sub pos { |
433 |
|
|
my $self = shift; |
434 |
dpavlin |
286 |
return $self->{pos}; |
435 |
dpavlin |
285 |
} |
436 |
|
|
|
437 |
|
|
|
438 |
|
|
=head2 size |
439 |
|
|
|
440 |
|
|
Returns number of records in database |
441 |
|
|
|
442 |
|
|
print $isis->size; |
443 |
|
|
|
444 |
|
|
Result from this function can be used to loop through all records |
445 |
|
|
|
446 |
|
|
foreach my $mfn ( 1 ... $isis->size ) { ... } |
447 |
|
|
|
448 |
dpavlin |
286 |
because it takes into account C<offset> and C<limit>. |
449 |
dpavlin |
285 |
|
450 |
|
|
=cut |
451 |
|
|
|
452 |
|
|
sub size { |
453 |
|
|
my $self = shift; |
454 |
dpavlin |
286 |
return $self->{size}; |
455 |
dpavlin |
285 |
} |
456 |
|
|
|
457 |
|
|
=head2 seek |
458 |
|
|
|
459 |
|
|
Seek to specified MFN in file. |
460 |
|
|
|
461 |
|
|
$isis->seek(42); |
462 |
|
|
|
463 |
|
|
First record in database has position 1. |
464 |
|
|
|
465 |
|
|
=cut |
466 |
|
|
|
467 |
|
|
sub seek { |
468 |
|
|
my $self = shift; |
469 |
|
|
my $pos = shift || return; |
470 |
|
|
|
471 |
|
|
my $log = $self->_get_logger(); |
472 |
|
|
|
473 |
|
|
if ($pos < 1) { |
474 |
|
|
$log->warn("seek before first record"); |
475 |
|
|
$pos = 1; |
476 |
dpavlin |
286 |
} elsif ($pos > $self->{max_pos}) { |
477 |
dpavlin |
285 |
$log->warn("seek beyond last record"); |
478 |
dpavlin |
286 |
$pos = $self->{max_pos}; |
479 |
dpavlin |
285 |
} |
480 |
|
|
|
481 |
dpavlin |
286 |
return $self->{pos} = (($pos - 1) || -1); |
482 |
dpavlin |
285 |
} |
483 |
|
|
|
484 |
dpavlin |
506 |
=head2 stats |
485 |
dpavlin |
285 |
|
486 |
dpavlin |
506 |
Dump statistics about field and subfield usage |
487 |
|
|
|
488 |
dpavlin |
507 |
print $input->stats; |
489 |
dpavlin |
506 |
|
490 |
|
|
=cut |
491 |
|
|
|
492 |
|
|
sub stats { |
493 |
|
|
my $self = shift; |
494 |
dpavlin |
507 |
|
495 |
|
|
my $log = $self->_get_logger(); |
496 |
|
|
|
497 |
|
|
my $s = $self->{_stats}; |
498 |
|
|
if (! $s) { |
499 |
|
|
$log->warn("called stats, but there is no statistics collected"); |
500 |
|
|
return; |
501 |
|
|
} |
502 |
|
|
|
503 |
|
|
my $max_fld = 0; |
504 |
|
|
|
505 |
|
|
my $out = join("\n", |
506 |
|
|
map { |
507 |
|
|
my $f = $_ || die "no field"; |
508 |
|
|
my $v = $s->{fld}->{$f} || die "no s->{fld}->{$f}"; |
509 |
|
|
$max_fld = $v if ($v > $max_fld); |
510 |
|
|
|
511 |
dpavlin |
519 |
my $o = sprintf("%4s %d ~", $f, $v); |
512 |
dpavlin |
507 |
|
513 |
|
|
if (defined($s->{sf}->{$f})) { |
514 |
|
|
map { |
515 |
dpavlin |
593 |
$o .= sprintf(" %s:%d%s", $_, |
516 |
|
|
$s->{sf}->{$f}->{$_}->{count}, |
517 |
|
|
$s->{sf}->{$f}->{$_}->{repeatable} ? '*' : '', |
518 |
|
|
); |
519 |
dpavlin |
507 |
} sort keys %{ $s->{sf}->{$f} }; |
520 |
|
|
} |
521 |
|
|
|
522 |
|
|
if (my $v_r = $s->{repeatable}->{$f}) { |
523 |
|
|
$o .= " ($v_r)" if ($v_r != $v); |
524 |
|
|
} |
525 |
|
|
|
526 |
|
|
$o; |
527 |
dpavlin |
519 |
} sort { $a cmp $b } keys %{ $s->{fld} } |
528 |
dpavlin |
507 |
); |
529 |
|
|
|
530 |
|
|
$log->debug( sub { Dumper($s) } ); |
531 |
|
|
|
532 |
|
|
return $out; |
533 |
dpavlin |
506 |
} |
534 |
|
|
|
535 |
dpavlin |
598 |
=head2 modify_record_regexps |
536 |
dpavlin |
597 |
|
537 |
|
|
Generate hash with regexpes to be applied using L<filter>. |
538 |
|
|
|
539 |
|
|
my $regexpes = $input->modify_record_regexps( |
540 |
|
|
900 => { '^a' => { ' : ' => '^b' } }, |
541 |
|
|
901 => { '*' => { '^b' => ' ; ' } }, |
542 |
|
|
); |
543 |
|
|
|
544 |
|
|
=cut |
545 |
|
|
|
546 |
|
|
sub modify_record_regexps { |
547 |
|
|
my $self = shift; |
548 |
|
|
my $modify_record = {@_}; |
549 |
|
|
|
550 |
|
|
my $regexpes; |
551 |
|
|
|
552 |
|
|
foreach my $f (keys %$modify_record) { |
553 |
|
|
warn "--- f: $f\n"; |
554 |
|
|
foreach my $sf (keys %{ $modify_record->{$f} }) { |
555 |
|
|
warn "---- sf: $sf\n"; |
556 |
|
|
foreach my $from (keys %{ $modify_record->{$f}->{$sf} }) { |
557 |
|
|
my $to = $modify_record->{$f}->{$sf}->{$from}; |
558 |
|
|
#die "no field?" unless defined($to); |
559 |
|
|
warn "----- transform: |$from| -> |$to|\n"; |
560 |
|
|
|
561 |
|
|
if ($sf =~ /^\^/) { |
562 |
|
|
my $regex = |
563 |
|
|
's/\Q'. $sf .'\E([^\^]+)\Q'. $from .'\E([^\^]+)/'. $sf .'$1'. $to .'$2/g'; |
564 |
|
|
push @{ $regexpes->{$f} }, $regex; |
565 |
|
|
warn ">>>>> $regex [sf]\n"; |
566 |
|
|
} else { |
567 |
|
|
my $regex = |
568 |
|
|
's/\Q'. $from .'\E/'. $to .'/g'; |
569 |
|
|
push @{ $regexpes->{$f} }, $regex; |
570 |
|
|
warn ">>>>> $regex [global]\n"; |
571 |
|
|
} |
572 |
|
|
|
573 |
|
|
} |
574 |
|
|
} |
575 |
|
|
} |
576 |
|
|
|
577 |
|
|
return $regexpes; |
578 |
|
|
} |
579 |
|
|
|
580 |
dpavlin |
3 |
=head1 MEMORY USAGE |
581 |
dpavlin |
1 |
|
582 |
dpavlin |
3 |
C<low_mem> options is double-edged sword. If enabled, WebPAC |
583 |
|
|
will run on memory constraint machines (which doesn't have enough |
584 |
|
|
physical RAM to create memory structure for whole source database). |
585 |
dpavlin |
1 |
|
586 |
dpavlin |
3 |
If your machine has 512Mb or more of RAM and database is around 10000 records, |
587 |
|
|
memory shouldn't be an issue. If you don't have enough physical RAM, you |
588 |
|
|
might consider using virtual memory (if your operating system is handling it |
589 |
|
|
well, like on FreeBSD or Linux) instead of dropping to L<DBM::Deep> to handle |
590 |
|
|
parsed structure of ISIS database (this is what C<low_mem> option does). |
591 |
dpavlin |
1 |
|
592 |
dpavlin |
3 |
Hitting swap at end of reading source database is probably o.k. However, |
593 |
|
|
hitting swap before 90% will dramatically decrease performance and you will |
594 |
|
|
be better off with C<low_mem> and using rest of availble memory for |
595 |
|
|
operating system disk cache (Linux is particuallary good about this). |
596 |
|
|
However, every access to database record will require disk access, so |
597 |
|
|
generation phase will be slower 10-100 times. |
598 |
|
|
|
599 |
|
|
Parsed structures are essential - you just have option to trade RAM memory |
600 |
|
|
(which is fast) for disk space (which is slow). Be sure to have planty of |
601 |
|
|
disk space if you are using C<low_mem> and thus L<DBM::Deep>. |
602 |
|
|
|
603 |
|
|
However, when WebPAC is running on desktop machines (or laptops :-), it's |
604 |
|
|
highly undesireable for system to start swapping. Using C<low_mem> option can |
605 |
|
|
reduce WecPAC memory usage to around 64Mb for same database with lookup |
606 |
|
|
fields and sorted indexes which stay in RAM. Performance will suffer, but |
607 |
|
|
memory usage will really be minimal. It might be also more confortable to |
608 |
|
|
run WebPAC reniced on those machines. |
609 |
|
|
|
610 |
|
|
|
611 |
|
|
=head1 AUTHOR |
612 |
|
|
|
613 |
|
|
Dobrica Pavlinusic, C<< <dpavlin@rot13.org> >> |
614 |
|
|
|
615 |
dpavlin |
1 |
=head1 COPYRIGHT & LICENSE |
616 |
|
|
|
617 |
dpavlin |
599 |
Copyright 2005-2006 Dobrica Pavlinusic, All Rights Reserved. |
618 |
dpavlin |
1 |
|
619 |
|
|
This program is free software; you can redistribute it and/or modify it |
620 |
|
|
under the same terms as Perl itself. |
621 |
|
|
|
622 |
|
|
=cut |
623 |
|
|
|
624 |
|
|
1; # End of WebPAC::Input |