Raw content of Bio::DB::BioFetch
<![CDATA[# $Id: BioFetch.pm,v 1.13.2.1 2003/06/25 13:44:18 heikki Exp $
#
# BioPerl module for Bio::DB::BioFetch
#
# Cared for by Lincoln Stein <lstein@cshl.org>
#
# Copyright Lincoln Stein
#
# You may distribute this module under the same terms as perl itself
#
# POD documentation - main docs before the code
#
package Bio::DB::BioFetch;
use strict;
use Bio::DB::WebDBSeqI;
use HTTP::Request::Common 'POST';
=head1 NAME
Bio::DB::BioFetch - Database object interface to BioFetch retrieval
=head1 SYNOPSIS
use Bio::DB::BioFetch;
$bf = new Bio::DB::BioFetch;
$seq = $sp->get_Seq_by_id('BUM'); # EMBL or SWALL ID
# change formats, storage procedures
$bf = new Bio::DB::BioFetch(-format => 'fasta',
-retrievaltype => 'tempfile',
-db => 'EMBL');
$stream = $bf->get_Stream_by_id(['BUM','J00231']);
while (my $s = $stream->next_seq) {
print $s->seq,"\n";
}
# get a RefSeq entry
$bf->db('refseq');
eval {
$seq = $bf->get_Seq_by_version('NM_006732.1'); # RefSeq VERSION
};
print "accession is ", $seq->accession_number, "\n" unless $@;
=head1 DESCRIPTION
Bio::DB::BioFetch is a guaranteed best effort sequence entry fetching
method. It goes to the Web-based dbfetch server located at the EBI
(http://www.ebi.ac.uk/cgi-bin/dbfetch) to retrieve sequences in the
EMBL or GenBank sequence repositories.
This module implements all the Bio::DB::RandomAccessI interface, plus
the get_Stream_by_id() and get_Stream_by_acc() methods that are found
in the Bio::DB::SwissProt interface.
=head1 FEEDBACK
=head2 Mailing Lists
User feedback is an integral part of the evolution of this and other
Bioperl modules. Send your comments and suggestions preferably to one
of the Bioperl mailing lists. Your participation is much appreciated.
bioperl-l@bioperl.org - General discussion
http://bio.perl.org/MailList.html - About the mailing lists
=head2 Reporting Bugs
Report bugs to the Bioperl bug tracking system to help us keep track
the bugs and their resolution. Bug reports can be submitted via email
or the web:
bioperl-bugs@bio.perl.org
http://bugzilla.bioperl.org/
=head1 AUTHOR - Lincoln Stein
Email Lincoln Stein E<lt>lstein@cshl.orgE<lt>
Also thanks to Heikki Lehvaslaiho E<lt>heikki@ebi.ac.ukE<gt> for the
BioFetch server and interface specification.
=head1 APPENDIX
The rest of the documentation details each of the object
methods. Internal methods are usually preceded with a _
=cut
# Let the code begin...
use vars qw(@ISA $VERSION %FORMATMAP );
use Bio::Root::Root;
@ISA = qw(Bio::DB::WebDBSeqI Bio::Root::Root);
$VERSION = '1.0';
# warning: names used here must map into Bio::SeqIO::* space
use constant DEFAULT_LOCATION => 'http://www.ebi.ac.uk/cgi-bin/dbfetch';
BEGIN {
%FORMATMAP = (
'embl' => {
default => 'embl', # default BioFetch format/SeqIOmodule pair
embl => 'embl', # alternative BioFetch format/module pair
fasta => 'fasta', # alternative BioFetch format/module pair
namespace => 'embl',
},
'swissprot' => {
default => 'swiss',
swissprot => 'swiss',
fasta => 'fasta',
namespace => 'swall',
},
'refseq' => {
default => 'genbank',
genbank => 'genbank',
fasta => 'fasta',
namespace => 'RefSeq',
},
'swall' => {
default => 'swiss',
swissprot => 'swiss',
fasta => 'fasta',
namespace => 'swall',
},
'genbank' => {
default => 'genbank',
genbank => 'genbank',
namespace => 'genbank',
},
'genpep' => {
default => 'genbank',
genbank => 'genbank',
namespace => 'genpep',
},
);
}
=head2 new
Title : new
Usage : $bf = Bio::DB::BioFetch->new(@args)
Function: Construct a new Bio::DB::BioFetch object
Returns : a Bio::DB::BioFetch object
Args : see below
Throws :
@args are standard -name=E<gt>value options as listed in the following
table. If you do not provide any options, the module assumes reasonable
defaults.
Option Value Default
------ ----- -------
-baseaddress location of dbfetch server http://www.ebi.ac.uk/cgi-bin/dbfetch
-retrievaltype "tempfile" or "io_string" io_string
-format "embl", "fasta", "swissprot", embl
or "genbank"
-db "embl", "genbank" or "swissprot" embl
=cut
#'
sub new {
my ($class,@args) = @_;
my $self = $class->SUPER::new(@args);
my ($db) = $self->_rearrange([qw(DB)],@args);
$db ||= $self->default_db;
$self->db($db);
$self->url_base_address(DEFAULT_LOCATION) unless $self->url_base_address;
$self;
}
=head2 new_from_registry
Title : new_from_registry
Usage : $biofetch = $db->new_from_registry(%config)
Function: Creates a BioFetch object from the registry config hash
Returns : itself
Args : A configuration hash (see Registry.pm)
Throws :
=cut
sub new_from_registry {
my ($class,%config)=@_;
my $self = $class->SUPER::new(
-BASEADDRESS=>$config{'location'}
);
$self->db($config{'dbname'}) if $config{dbname};
return $self;
}
# from Bio::DB::RandomAccessI
=head2 get_Seq_by_id
Title : get_Seq_by_id
Usage : $seq = $db->get_Seq_by_id('ROA1_HUMAN')
Function: Gets a Bio::Seq object by its name
Returns : a Bio::Seq object
Args : the id (as a string) of a sequence
Throws : "id does not exist" exception
=cut
=head2 get_Seq_by_acc
Title : get_Seq_by_acc
Usage : $seq = $db->get_Seq_by_acc('X77802');
Function: Gets a Bio::Seq object by accession number
Returns : A Bio::Seq object
Args : accession number (as a string)
Throws : "acc does not exist" exception
=cut
=head2 get_Seq_by_gi
Title : get_Seq_by_gi
Usage : $seq = $db->get_Seq_by_gi('405830');
Function: Gets a Bio::Seq object by gi number
Returns : A Bio::Seq object
Args : gi number (as a string)
Throws : "gi does not exist" exception
=cut
=head2 get_Seq_by_version
Title : get_Seq_by_version
Usage : $seq = $db->get_Seq_by_version('X77802.1');
Function: Gets a Bio::Seq object by sequence version
Returns : A Bio::Seq object
Args : accession.version (as a string)
Throws : "acc.version does not exist" exception
=cut
sub get_Seq_by_version {
my ($self,$seqid) = @_;
return $self->get_Seq_by_acc($seqid);
}
=head2 get_Stream_by_id
Title : get_Stream_by_id
Usage : $stream = $db->get_Stream_by_id( [$uid1, $uid2] );
Function: Gets a series of Seq objects by unique identifiers
Returns : a Bio::SeqIO stream object
Args : $ref : a reference to an array of unique identifiers for
the desired sequence entries
=cut
=head2 get_Stream_by_gi
Title : get_Stream_by_gi
Usage : $seq = $db->get_Seq_by_gi([$gi1, $gi2]);
Function: Gets a series of Seq objects by gi numbers
Returns : a Bio::SeqIO stream object
Args : $ref : a reference to an array of gi numbers for
the desired sequence entries
Note : For GenBank, this just calls the same code for get_Stream_by_id()
=cut
=head2 get_Stream_by_batch
Title : get_Stream_by_batch
Usage : $seq = $db->get_Stream_by_batch($ref);
Function: Get a series of Seq objects by their IDs
Example :
Returns : a Bio::SeqIO stream object
Args : $ref : an array reference containing a list of unique
ids/accession numbers.
In some of the Bio::DB::* moduels, get_Stream_by_id() is called
get_Stream_by_batch(). Since there seems to be no consensus, this
is provided as an alias.
=cut
*get_Stream_by_batch = \&Bio::DB::WebDBSeqI::get_Stream_by_id;
=head1 The remainder of these methods are for internal use
=head2 get_request
Title : get_request
Usage : my $url = $self->get_request
Function: returns a HTTP::Request object
Returns :
Args : %qualifiers = a hash of qualifiers (ids, format, etc)
=cut
sub get_request {
my ($self, @qualifiers) = @_;
my ($uids, $format) = $self->_rearrange([qw(UIDS FORMAT)],
@qualifiers);
my $db = $self->db;
my $namespace = $self->_namespace;
$self->throw("Must specify a value for UIDs to fetch")
unless defined $uids;
my $tmp;
my $format_string = '';
$format ||= $self->default_format;
($format, $tmp) = $self->request_format($format);
my $base = $self->url_base_address;
my $uid = join('+', ref $uids ? @$uids : $uids);
$self->debug("\n$base$format_string&id=$uid\n");
return POST($base,
[ db => $namespace,
id => join('+',ref $uids ? @$uids : $uids),
format => $format,
style => 'raw'
]);
}
=head2 default_format
Title : default_format
Usage : $format = $self->default_format
Function: return the default format
Returns : a string
Args :
=cut
sub default_format {
return 'default';
}
=head2 default_db
Title : default_db
Usage : $db = $self->default_db
Function: return the default database
Returns : a string
Args :
=cut
sub default_db { 'embl' }
=head2 db
Title : db
Usage : $db = $self->db([$db])
Function: get/set the database
Returns : a string
Args : new database
=cut
sub db {
my $self = shift;
if (@_) {
my $db = lc shift;
$FORMATMAP{$db} or $self->throw("invalid db [$db], must be one of [".
join(' ',keys %FORMATMAP). "]");
$self->{_db} = $db;
}
return $self->{_db} || $self->default_db ;
}
sub _namespace {
my $self = shift;
my $db = $self->db;
return $FORMATMAP{$db}{namespace} or $db;
}
=head2 postprocess_data
Title : postprocess_data
Usage : $self->postprocess_data ( 'type' => 'string',
'location' => \$datastr);
Function: process downloaded data before loading into a Bio::SeqIO
Returns : void
Args : hash with two keys - 'type' can be 'string' or 'file'
- 'location' either file location or string
reference containing data
=cut
sub postprocess_data {
my ($self,%args) = @_;
# check for errors in the stream
if ($args{'type'} eq 'string') {
my $stringref = $args{'location'};
if ($$stringref =~ /^ERROR (\d+) (.+)/m) {
$self->throw("BioFetch Error $1: $2");
}
}
elsif ($args{'type'} eq 'file') {
open (F,$args{'location'}) or $self->throw("Couldn't open $args{location}: $!");
# this is dumb, but the error may be anywhere on the first three lines because the
# CGI headers are sometimes printed out by the server...
my @data = (scalar <F>,scalar <F>,scalar <F>);
if (join('',@data) =~ /^ERROR (\d+) (.+)/m) {
$self->throw("BioFetch Error $1: $2");
}
close F;
}
else {
$self->throw("Don't know how to postprocess data of type $args{'type'}");
}
}
=head2 request_format
Title : request_format
Usage : my ($req_format, $ioformat) = $self->request_format;
$self->request_format("genbank");
$self->request_format("fasta");
Function: Get/Set sequence format retrieval. The get-form will normally not
be used outside of this and derived modules.
Returns : Array of two strings, the first representing the format for
retrieval, and the second specifying the corresponding SeqIO format.
Args : $format = sequence format
=cut
sub request_format {
my ($self, $value) = @_;
if ( defined $value ) {
my $db = $self->db;
my $namespace = $self->_namespace;
my $format = lc $value;
print "format:", $format, " module:", $FORMATMAP{$db}->{$format}, " ($namespace)\n"
if $self->verbose > 0;
$self->throw("Invalid format [$format], must be one of [".
join(' ',keys %{$FORMATMAP{$db}}). "]")
unless $format eq 'default' || $FORMATMAP{$db}->{$format};
$self->{'_format'} = [ $format, $FORMATMAP{$db}->{$format}];
}
return @{$self->{'_format'}};
}
=head2 Bio::DB::WebDBSeqI methods
Overriding WebDBSeqI method to help newbies to retrieve sequences.
EMBL database is all too often passed RefSeq accessions. This
redirects those calls. See L<Bio::DB::RefSeq>.
=head2 get_Stream_by_acc
Title : get_Stream_by_acc
Usage : $seq = $db->get_Seq_by_acc([$acc1, $acc2]);
Function: Gets a series of Seq objects by accession numbers
Returns : a Bio::SeqIO stream object
Args : $ref : a reference to an array of accession numbers for
the desired sequence entries
=cut
sub get_Stream_by_acc {
my ($self, $ids ) = @_;
$self->_check_id($ids);
return $self->get_seq_stream('-uids' => $ids, '-mode' => 'single');
}
=head2 _check_id
Title : _check_id
Usage :
Function: Throw on whole chromosome NCBI sequences not in sequence databases
and redirect RefSeq accession requests sent to EMBL.
Returns :
Args : $id(s), $string
Throws : if accessionn number indicates whole chromosome NCBI sequence
=cut
sub _check_id {
my ($self, $id) = @_;
# NT contigs can not be retrieved
$self->throw("NT_ contigs are whole chromosome files which are not part of regular".
"database distributions. Go to ftp://ftp.ncbi.nih.gov/genomes/.")
if $id =~ /NT_/;
# Asking for a RefSeq from EMBL/GenBank
if ($id =~ /N._/ && $self->db ne 'refseq') {
$self->warn("[$id] is not a normal sequence database but a RefSeq entry.".
" Redirecting the request.\n")
if $self->verbose >= 0;
$self->db('RefSeq');
}
}
1;
]]>