Raw content of Bio::EnsEMBL::External::ExternalFeatureAdaptor =head1 LICENSE Copyright (c) 1999-2009 The European Bioinformatics Institute and Genome Research Limited. All rights reserved. This software is distributed under a modified Apache license. For license details, please see /info/about/code_licence.html =head1 CONTACT Please email comments or questions to the public Ensembl developers list at <ensembl-dev@ebi.ac.uk>. Questions may also be sent to the Ensembl help desk at <helpdesk@ensembl.org>. =cut =head1 NAME Bio::EnsEMBL::External::ExternalFeatureAdaptor =head 1 SUMMARY Allows features created externally from Ensembl in a single coordinate system to be retrieved in several other (Ensembl-style) coordinate systems. This is intended to be a replacement for the old Bio::EnsEMBL::DB::ExternalFeatureFactoryI interface. =head1 SYNOPSIS $database_adaptor = new Bio::EnsEMBL::DBSQL::DBAdaptor( -host => 'kaka.sanger.ac.uk', -dbname => 'homo_sapiens_core_9_30', -pass => 'anonymous' ); $xf_adaptor = new ExternalFeatureAdaptorSubClass; # Connect the Ensembl core database: $xf_adaptor->db($database_adaptor); # get some features in vontig coords @feats = @{ $xf_adaptor->fetch_all_by_contig_name('AC000087.2.1.42071') }; # get some features in assembly coords @feats = @{ $xf_adaptor->fetch_all_by_chr_start_end( 'X', 100000, 200000 ) }; # get some features in clone coords @feats = @{ $xf_adaptor->fetch_all_by_clone_accession('AC000087') }; # Add the adaptor to the ensembl core dbadaptor (implicitly sets db # attribute) $database_adaptor->add_ExternalFeatureAdaptor($xf_adaptor); # get some features in Slice coords $slice_adaptor = $database_adaptor->get_SliceAdaptor; $slice = $slice_adaptor->fetch_all_by_chr_start_end( 1, 100000, 200000 ); @feats = @{ $xf_adaptor->fetch_all_by_Slice($slice) }; # now features can be retrieved directly from Slice @feats = @{ $slice->get_all_ExternalFeatures }; =head1 DESCRIPTION This class is intended to be used as a method of getting external features into EnsEMBL. To work, this class must be extended and must implement the the coordinate_systems method. As well, the subclass is required to implement a single fetch method so that the external features may be retrieved. By implementing a single fetch_method in a single coordinate system all of the other ExternalFeatureAdaptor fetch methods become available for retrieving the data in several different coordinate systems. The coordinate_systems method should return a list of strings indicating which coordinate system(s) have been implemented. If a given string is returned from the coordinate_systems method then the corresponding fetch method must be implemented. The reverse is also true: if a fetch method is implemented then coordinate_systems must return the appropriate string in its list of return values. The following are the valid coordinate system values and the corresponding fetch methods that must be implemented: COORD SYSTEM STRING FETCH_METHOD ------------------- ------------ 'ASSEMBLY' fetch_all_by_chr_start_end 'CLONE' fetch_all_by_clone_accession 'CONTIG' fetch_all_by_contig_name 'SUPERCONTIG' fetch_all_by_supercontig_name 'SLICE' fetch_all_by_Slice The objects returned by the fetch methods should be EnsEMBL or BioPerl style Feature objects. These objects MUST have start, end and strand methods. Before the non-overridden ExternalFeatureAdaptor fetch methods may be called an EnsEMBL core database adaptor must be attached to the ExternalFeatureAdaptor . This database adaptor is required to perform the remappings between various coordinate system. This may be done implicitly by adding the ExternalFeatureAdaptor to the database adaptor through a call to the DBAdaptor add_ExternalFeatureAdaptor method or explicitly by calling the ExternalFeatureAdaptor ensembl_db method. =head1 METHODS =cut package Bio::EnsEMBL::External::ExternalFeatureAdaptor; use strict; use Bio::EnsEMBL::Utils::Exception qw(warning throw); =head2 new Arg [1] : none Example : $xfa = new Bio::EnsEMBL::External::ExternalFeatureAdaptor; Description: Creates a new ExternalFeatureAdaptor object. You may wish to extend this constructor and provide your own set of paremeters. Returntype : Bio::EnsEMBL::External::ExternalFeatureAdaptor Exceptions : none Caller : general =cut sub new { my $class = shift; if(ref $class) { return bless {}, ref $class; } return bless {}, $class; } =head2 ensembl_db Arg [1] : (optional) Bio::EnsEMBL::DBSQL::DBAdaptor Example : $external_feature_adaptor->ensembl_db($new_val); Description: none Returntype : Bio::EnsEMBL::DBSQL::DBAdaptor Exceptions : none Caller : internal =cut sub ensembl_db { my ($self, $value) = @_; if($value) { $self->{'ensembl_db'} = $value; } return $self->{'ensembl_db'}; } =head2 coordinate_systems Arg [1] : none Example : @implemented_coord_systems = $ext_adaptor->coordinate_systems; Description: ABSTRACT method. Must be implemented by all ExternalFeatureAdaptor subclasses. This method returns a list of coordinate systems which are implemented by the subclass. A minimum of on valid coordinate system must be implemented. Valid coordinate systems are: 'SLICE', 'ASSEMBLY', 'CONTIG', and 'CLONE'. Returntype : list of strings Exceptions : none Caller : internal =cut sub coordinate_systems { my $self = shift; throw("abstract method coordinate_systems not implemented\n"); return ''; } =head2 track_name Arg [1] : none Example : $track_name = $xf_adaptor->track_name; Description: Currently this is not really used. In the future it may be possible to have ExternalFeatures automatically displayed by the EnsEMBL web code. By default this method returns 'External features' but you are encouraged to override this method and provide your own meaningful name for the features your adaptor provides. This also allows you to distinguish the type of features retrieved from Slices. See the PODs for Bio::EnsEMBL::Slice::get_all_ExternalFeatures and Bio::EnsEMBL::DBSQL::DBAdaptor::add_ExternalFeatureAdaptor methods. Returntype : string Exceptions : none Caller : Bio::EnsEMBL::DBSQL::DBAdaptor::add_ExternalFeatureAdaptor =cut sub track_name { my $self = shift; return 'External features'; } =head2 feature_type Arg [1] : none Example : $feature_type = $xf_adaptor->track_name Description: Currently this is not used. In the future it may be possible to have ExternalFeatures automatically displayed by the EnsEMBL web code. This method would then be used do determine the type of glyphs used to draw the features which are returned from this external adaptor. Returntype : string Exceptions : none Caller : none =cut sub feature_type { my $self = shift; return qw(SIMPLE); } =head2 fetch_all_by_Slice Arg [1] : Bio::EnsEMBL::Slice $slice Example : @features = @{$ext_adaptor->fetch_all_by_Slice($slice)}; Description: Retrieves all features which lie in the region defined by $slice in slice coordinates. If this method is overridden then the coordinate_systems method must return 'SLICE' as one of its values. This method will work as is (i.e. without overriding it) providing at least one of the other fetch methods is overridden. Returntype : reference to a list of Bio::SeqFeature objects in the Slice coordinate system Exceptions : Thrown on incorrect input arguments Caller : general, fetch_all_by_chr_start_end =cut sub fetch_all_by_Slice { my ($self, $slice) = @_; unless($slice && ref $slice && $slice->isa('Bio::EnsEMBL::Slice')) { throw("[$slice] is not a Bio::EnsEMBL::Slice"); } my $out = []; my $csa = $self->ensembl_db->get_CoordSystemAdaptor(); my $slice_start = $slice->start; my $slice_end = $slice->end; my $slice_strand = $slice->strand; my $slice_seq_region = $slice->seq_region_name; my $slice_seq_region_id = $slice->get_seq_region_id; my $coord_system = $slice->coord_system; if($self->_supported('SLICE')) { throw("ExternalFeatureAdaptor supports SLICE coordinate system" . " but fetch_all_by_Slice not implemented"); } my %features; my $from_coord_system; my $fetch_method; # # Get all of the features from whatever coord system they are computed in # if($self->_supported('CLONE')) { $fetch_method = sub { my $self = shift; my $name = shift; my ($acc, $ver) = split(/\./, $name); $self->fetch_all_by_clone_accession($acc,$ver,@_); }; $from_coord_system = $csa->fetch_by_name('clone'); } elsif($self->_supported('ASSEMBLY')) { $from_coord_system = $csa->fetch_by_name('chromosome'); $fetch_method = $self->can('fetch_all_by_chr_start_end'); } elsif($self->_supported('CONTIG')) { $from_coord_system = $csa->fetch_by_name('contig'); $fetch_method = $self->can('fetch_all_by_contig_name'); } elsif($self->_supported('SUPERCONTIG')) { $from_coord_system = $csa->fetch_by_name('supercontig'); $fetch_method = $self->can('fetch_all_by_supercontig_name'); } else { $self->_no_valid_coord_systems(); } if($from_coord_system->equals($coord_system)) { $features{$slice_seq_region} = &$fetch_method($self, $slice_seq_region, $slice_start,$slice_end); } else { foreach my $segment (@{$slice->project($from_coord_system->name, $from_coord_system->version)}) { my ($start,$end,$pslice) = @$segment; $features{$pslice->seq_region_name } ||= []; push @{$features{$pslice->seq_region_name }}, @{&$fetch_method($self, $pslice->seq_region_name, $pslice->start(), $pslice->end())}; } } my @out; if(!$coord_system->equals($from_coord_system)) { my $asma = $self->ensembl_db->get_AssemblyMapperAdaptor(); my $mapper = $asma->fetch_by_CoordSystems($from_coord_system, $coord_system); my %slice_cache; my $slice_adaptor = $self->ensembl_db->get_SliceAdaptor(); my $slice_setter; #convert the coordinates of each of the features retrieved foreach my $fseq_region (keys %features) { my $feats = $features{$fseq_region}; next if(!$feats); $slice_setter = _guess_slice_setter($feats) if(!$slice_setter); foreach my $f (@$feats) { my($sr_id, $start, $end, $strand) = $mapper->fastmap($fseq_region,$f->start,$f->end,$f->strand, $from_coord_system); #maps to gap next if(!defined($sr_id)); #maps to unexpected seq region, probably error in the externally if($sr_id ne $slice_seq_region_id) { warning("Externally created Feature mapped to [$sr_id] " . "which is not on requested seq_region_id [$slice_seq_region_id]"); next; } #update the coordinates of the feature &$slice_setter($f,$slice); $f->start($start); $f->end($end); $f->strand($strand); push @out, $f; } } } else { #we already know the seqregion the featues are on, we just have #to put them on the slice @out = @{$features{$slice_seq_region}}; my $slice_setter = _guess_slice_setter(\@out); foreach my $f (@out) { &$slice_setter($f,$slice); } } #shift the feature coordinates again if #the requested slice is not the full seqregion if($slice->start != 1 || $slice->strand != 1) { #convert from assembly coords to slice coords my($f_start, $f_end, $f_strand); foreach my $f (@out) { if($slice_strand == 1) { $f_start = $f->start - $slice_start + 1; $f_end = $f->end - $slice_start + 1; $f_strand = $f->strand; } else { $f_start = $slice_end - $f->end + 1; $f_end = $slice_end - $f->start + 1; $f_strand = $f->strand * -1; } $f->start($f_start); $f->end($f_end); $f->strand($f_strand); } } return \@out; } sub _guess_slice_setter { my $features = shift; #we do not know what type of features these are. They might #be bioperl features or old ensembl features, hopefully they are new #style features. Try to come up with a setter method for the #slice. return undef if(!@$features); my ($f) = @$features; my $slice_setter; foreach my $method (qw(slice contig attach_seq)) { last if($slice_setter = $f->can($method)); } if(!$slice_setter) { if($f->can('seqname')) { $slice_setter = sub { $_[0]->seqname($_[1]->seq_region_name()); }; } else { $slice_setter = sub{} if(!$slice_setter); } } return $slice_setter; } =head2 fetch_all_by_contig_name Arg [1] : string $contig_name Arg [2] : int $start (optional) The start of the region on the contig to retrieve features on if not specified the whole of the contig is used. Arg [3] : int $end (optional) The end of the region on the contig to retrieve features on if not specified the whole of the contig is used. Example : @fs = @{$self->fetch_all_by_contig_name('AB00879.1.1.39436')}; Description: Retrieves features on the contig defined by the name $contig_name in contig coordinates. If this method is overridden then the coordinate_systems method must return 'CONTIG' as one of its values. This method will work as is (i.e. without being overridden) providing at least one other fetch method has been overridden. Returntype : reference to a list of Bio::SeqFeature objects in the contig coordinate system. Exceptions : thrown if the input argument is incorrect thrown if the coordinate_systems method returns the value 'CONTIG' and this method has not been overridden. Caller : general, fetch_all_by_Slice =cut sub fetch_all_by_contig_name { my ($self, $contig_name, $start, $end) = @_; unless($contig_name) { throw("contig_name argument not defined"); } if($self->_supported('CONTIG')) { throw("ExternalFeatureAdaptor supports CONTIG coordinate system" . " but fetch_all_by_contig_name is not implemented"); } unless($self->ensembl_db) { throw('DB attribute not set. This value must be set for the ' . 'ExternalFeatureAdaptor to function correctly'); } my $slice_adaptor = $self->ensembl_db->get_SliceAdaptor(); my $slice = $slice_adaptor->fetch_by_region('contig', $contig_name, $start, $end); return $self->fetch_all_by_Slice($slice); } =head2 fetch_all_by_supercontig_name Arg [1] : string $supercontig_name Arg [2] : int $start (optional) The start of the region on the contig to retrieve features on if not specified the whole of the contig is used. Arg [3] : int $end (optional) The end of the region on the contig to retrieve features on if not specified the whole of the contig is used. Example : @fs = @{$self->fetch_all_by_contig_name('NT_004321')}; Description: Retrieves features on the contig defined by the name $supercontigname in supercontig coordinates. If this method is overridden then the coordinate_systems method must return 'SUPERCONTIG' as one of its values. This method will work as is (i.e. without being overridden) providing at least one other fetch method has been overridden. Returntype : reference to a list of Bio::SeqFeature objects in the contig coordinate system. Exceptions : thrown if the input argument is incorrect thrown if the coordinate_systems method returns the value 'SUPERCONTIG' and this method has not been overridden. Caller : general, fetch_all_by_Slice =cut sub fetch_all_by_supercontig_name { my ($self, $supercontig_name, $start, $end) = @_; unless($supercontig_name) { throw("supercontig_name argument not defined"); } if($self->_supported('SUPERCONTIG')) { throw("ExternalFeatureAdaptor supports SUPERCONTIG coordinate system" . " but fetch_all_by_supercontig_name is not implemented"); } unless($self->ensembl_db) { throw('DB attribute not set. This value must be set for the ' . 'ExternalFeatureAdaptor to function correctly'); } my $slice_adaptor = $self->ensembl_db->get_SliceAdaptor(); my $slice = $slice_adaptor->fetch_by_region('supercontig', $supercontig_name, $start, $end); return $self->fetch_all_by_Slice($slice); } =head2 fetch_all_by_clone_accession Arg [1] : string $acc The EMBL accession number of the clone to fetch features from. Arg [2] : (optional) string $ver Arg [3] : (optional) int $start Arg [4] : (optional) int $end Example : @fs = @{$self->fetch_all_by_clone_accession('AC000093')}; Description: Retrieves features on the clone defined by the $acc arg in Clone coordinates. If this method is overridden then the coordinate_systems method must return 'CLONE' as one of its values. The arguments start, end, version are passed if this method is overridden and can optionally be used to reduce the scope of the query and improve performance. This method will work as is - providing at least one other fetch method has been overridden. Returntype : reference to a list of Bio::SeqFeature objects in the Clone coordinate system Exceptions : thrown if the input argument is incorrect thrown if the coordinate system method returns the value 'CLONE' and this method is not overridden. thrown if the coordinate systems method does not return any valid values. Caller : general, fetch_all_by_clone_accession =cut sub fetch_all_by_clone_accession { my ($self, $acc, $version, $start, $end) = @_; unless($acc) { throw("clone accession argument not defined"); } if($self->_supported('CLONE')) { throw('ExternalFeatureAdaptor supports CLONE coordinate system ' . 'but does not implement fetch_all_by_clone_accession'); } unless($self->ensembl_db) { throw('DB attribute not set. This value must be set for the ' . 'ExternalFeatureAdaptor to function correctly'); } if(defined($version)) { $acc = "$acc.$version"; } elsif(!$acc =~ /\./) { $acc = "$acc.1"; } my $slice_adaptor = $self->ensembl_db->get_SliceAdaptor; my $slice = $slice_adaptor->fetch_by_region('clone', $acc, $start, $end); return $self->fetch_all_by_Slice($slice); } =head2 fetch_all_by_chr_start_end Arg [1] : string $chr_name The name of the chromosome to retrieve features from Arg [2] : int $start The start coordinate of the chromosomal region to retrieve features from. Arg [3] : int $end The end coordinate of the chromosomal region to retrieve features from. Example : @features Description: Retrieves features on the region defined by the $chr_name, $start, and $end args in assembly (chromosomal) coordinates. If this method is overridden then the coordinate_systems method must return 'ASSEMBLY' as one of its values. This method will work as is (i.e. without overriding it) providing at least one of the other fetch methods is overridden. Returntype : reference to a list of Bio::SeqFeatures Exceptions : Thrown if the coordinate_systems method returns ASSEMBLY as a value and this method is not overridden. Thrown if any of the input arguments are incorrect Caller : general, fetch_all_by_Slice =cut sub fetch_all_by_chr_start_end { my ($self, $chr_name, $start, $end) = @_; unless($chr_name && defined $start && defined $end && $start < $end) { throw("Incorrect start [$start] end [$end] or chr [$chr_name] arg"); } unless($self->ensembl_db) { throw('DB attribute not set. This value must be set for the ' . 'ExternalFeatureAdaptor to function correctly'); } my $slice_adaptor = $self->ensembl_db->get_SliceAdaptor(); my $slice = $slice_adaptor->fetch_by_region('toplevel', $chr_name, $start, $end); return $self->fetch_all_by_Slice($slice); } =head2 _no_valid_coord_system Arg [1] : none Example : none Description: PRIVATE method - throws an error with a descriptive message Returntype : none Exceptions : always thrown Caller : internal =cut sub _no_valid_coord_system { my $self = shift; throw("This ExternalFeatureAdaptor does not support a known " . "coordinate system.\n Valid coordinate systems are: " . "[SLICE,ASSEMBLY,SUPERCONTIG,CONTIG,CLONE].\n This External Adaptor " . "supports: [" . join(', ', $self->coordinate_systems) . "]"); } =head2 _supported Arg [1] : string $system Example : print "CONTIG system supported" if($self->_supported('CONTIG')); Description: PRIVATE method. Tests if the coordinate system defined by the $system argument is implemented. Returntype : boolean Exceptions : none Caller : internal =cut sub _supported { my ($self, $system) = @_; #construct the hash of supported features if it has not been already unless(exists $self->{_supported}) { $self->{_supported} = {}; foreach my $coord_system ($self->coordinate_systems) { $self->{_supported}->{$coord_system} = 1; } } return $self->{_supported}->{$system}; } 1;