File Coverage

blib/lib/Bio/Nexml/Factory.pm

Criterion	Covered	Total	%
statement	36	320	11.2
branch	1	126	0.7
condition	0	59	0.0
subroutine	13	26	50.0
pod	10	11	90.9
total	60	542	11.0

# $Id: Util.pm 15875 2009-07-21 19:20:00Z chmille4 $
#
# BioPerl module for Bio::Nexml::Factory
#
# Please direct questions and support issues to
#
# Cared for by Chase Miller
#
# Copyright Chase Miller
#
# You may distribute this module under the same terms as perl itself

# POD documentation - main docs before the code

=head1 NAME

Bio::Nexml::Factory - A factory module for creating BioPerl and Bio::Phylo objects from/to nexml documents

=head1 SYNOPSIS

  Do not use this module directly. It shoulde be used through
  Bio::NexmlIO, Bio::SeqIO::nexml, Bio::AlignIO::nexml, or
  Bio::TreeIO::nexml


=head1 DESCRIPTION

This is a factory/utility module in the Nexml namespace.  It contains
methods that are needed by multiple modules.

This module handles the creation of BioPerl objects from Bio::Phylo
objects and vice versa, which is used to read and write nexml
documents to and from BioPerl objects.

=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
the Bioperl mailing list.  Your participation is much appreciated.

  [e-mail]                  - General discussion
  http://bioperl.org/wiki/Mailing_lists  - About the mailing lists

=head2 Support

Please direct usage questions or support issues to the mailing list:

I

rather than to the module maintainer directly. Many experienced and
reponsive experts will be able look at the problem and quickly
address it. Please include a thorough description of the problem
with code and data examples if at all possible.

=head2 Reporting Bugs

Report bugs to the Bioperl bug tracking system to help us keep track
of the bugs and their resolution. Bug reports can be submitted via
the web:

  https://github.com/bioperl/bioperl-live/issues

=head1 AUTHOR - Chase Miller

Email [e-mail]

=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

package Bio::Nexml::Factory;

use strict;

BEGIN {
    use Bio::Root::Root;
    unless (eval "require Bio::Phylo; 1") {
    Bio::Root::Root->throw("Bio::Phylo package required; see http://www.nexml.org for download details");
    }
}

use Bio::Phylo::Factory;
use Bio::Phylo::Matrices;
use Bio::Phylo::Matrices::Matrix;
use Bio::Phylo::Matrices::Datum;
use Bio::Phylo::Forest::Tree;
use Bio::Phylo::Matrices;
use Bio::Phylo::IO;

use Bio::SeqFeature::Generic;


use base qw(Bio::Root::Root);

my $fac = Bio::Phylo::Factory->new();


=head2 new

 Title   : new
 Usage   : my $obj = Bio::Nexml::Factory->new();
 Function: Builds a new L object
 Returns : L object
 Args    : none

=cut

sub new {
    my($class,@args) = @_;
    my $self = $class->SUPER::new(@args);
}

#should all these creates be private methods?
# naah./maj

=head2 create_bperl_aln

 Title   : create_bperl_aln
 Usage   : my @alns = $factory->create_bperl_aln($objIO);
 Function: Converts Bio::Phylo::Matrices::Matrix objects into L objects
 Returns : an array of L objects
 Args    : Bio::NexmlIO, Bio::SeqIO, Bio::AlignIO, or Bio::TreeIO

see [http://search.cpan.org/~rvosa/Bio-Phylo/lib/Bio/Phylo/Project.pm Bio::Phylo::Project]

=cut

sub create_bperl_aln {
    my ($self, $caller) = @_;
    my ($start, $end, $seq, $desc);
    my $matrices = $caller->doc->get_matrices();
    my @alns;

    foreach my $matrix (@$matrices)
    {
        #check if mol_type is something that makes sense to be an aln
        my $mol_type = lc($matrix->get_type());
        unless ($mol_type eq 'dna' || $mol_type eq 'rna' || $mol_type eq 'protein')
        {
            next;
            # something for the back-burner: BioPerl has objects
            # to handle arbitrary genotypes; might be cool to
            # be able to create something besides alignments
            # here .../maj
        }

        #continue creating an aln
        my $aln = Bio::SimpleAlign->new();
        my $taxa = $matrix->get_taxa();

        # TODO: should $caller->{_ID} always be defined?
        # ATM, this is a Bio::AlignIO::nexml stream...
        $aln->{_Nexml_ID} = $caller->{_ID}? $caller->{_ID} . $taxa->get_xml_id : $taxa->get_xml_id;

        my $aln_feats = Bio::SeqFeature::Generic->new();
        $aln_feats->add_tag_value('NexmlIO_ID', $caller->{_ID});
        #check if there is a taxa associated with this alignment
        if ($taxa) {
            $aln_feats->add_tag_value('taxa_id', $taxa->get_xml_id());
            $aln_feats->add_tag_value('taxa_label', $taxa->get_name()) if $taxa->get_name();

            my $taxon = $taxa->first;
            while ($taxon) {
                $aln_feats->add_tag_value('taxon', $taxon->get_name);
                $taxon = $taxa->next;
            }
        }
        $aln->add_SeqFeature($aln_feats);

        my $basename = $matrix->get_name();
        $aln->id($basename);
        my $seqNum = 0;
        my$row = $matrix->first;
        while ($row)
        {
            my $newSeq = $row->get_char();
            my $rowlabel;
            $seqNum++;

            #constuct seqID based on matrix label and row id
            my $seqID = "$basename.row_$seqNum";

            #Check if theres a row label and if not default to seqID
            if( !defined($rowlabel = $row->get_name())) {$rowlabel = $seqID;}

            $seq = Bio::LocatableSeq->new(
                          -seq         => $newSeq,
                          -display_id  => "$rowlabel",
                          #-description => $desc,
                          -alphabet    => $mol_type,
                          );
            my $seq_feats;
            #check if there is a taxa associated w/ this alignment
            if($taxa)
            {
                if (my $taxon = $taxa->get_by_name($row->get_taxon->get_name())) {
                    #attach taxon to each sequence by using the sequenceID because
                    #LocatableSeq does not support features
                    my $taxon_name = $taxon->get_name();
                    $seq_feats = Bio::SeqFeature::Generic->new();
                    $seq_feats->add_tag_value('taxon', "$taxon_name");
                    $seq_feats->add_tag_value('id', "$rowlabel");
                }
            }
            $aln->add_seq($seq);
            $aln->add_SeqFeature($seq_feats);
            $self->debug("Reading r$rowlabel\n");

            $row = $matrix->next();
        }
        push (@alns, $aln);
    }
    return \@alns;
}


=head2 create_bperl_tree

 Title   : create_bperl_tree
 Usage   : my @trees = $factory->create_bperl_seq($objIO);
 Function: Converts Bio::Phylo::Forest::Tree objects into L objects
 Returns : an array of L objects
 Args    : Bio::NexmlIO, Bio::SeqIO, Bio::AlignIO, or Bio::TreeIO

see [http://search.cpan.org/~rvosa/Bio-Phylo/lib/Bio/Phylo/Project.pm Bio::Phylo::Project]

=cut

sub create_bperl_tree {
    my($self, $caller) = @_;
    my @trees;

    my $forests = $caller->doc->get_forests();

    foreach my $forest (@$forests)
    {
        my $basename = $forest->get_name() || '';
        my $taxa = $forest->get_taxa();
        my $taxa_label = $taxa->get_name();
        my $taxa_id = $taxa->get_xml_id();

        my $t = $forest->first();

        while ($t)
        {
            my %created_nodes;
            my $tree_id = $t->get_name();
            my $tree = Bio::Tree::Tree->new(-id => "$basename.$tree_id");

            #set the taxa info of the tree
            $tree->add_tag_value('taxa_label', $taxa_label) if defined($taxa_label);
            $tree->add_tag_value('taxa_id', $taxa_id) if defined($taxa_id);

            # TODO: should $caller->{_ID} always be defined?
            # ATM, this is a Bio::TreeIO::nexml stream...
            $tree->add_tag_value('_NexmlIO_ID', $caller->{_ID}) if $caller->{_ID};

            my $taxon = $taxa->first;
            while($taxon) {
                $tree->add_tag_value('taxon', $taxon->get_name()) if defined($taxon->get_name);
                $taxon = $taxa->next;
            }

            #process terminals only, removing terminals as they get processed
            #which inturn creates new terminals to process until the entire tree has been processed
            my $terminals = $t->get_terminals();
#           for(my $i=0; $i<@$terminals; $i++)
            while (my $terminal = shift @$terminals)
            {
#               my $terminal = $$terminals[$i];
                my $new_node_id = $terminal->get_name();
                my $newNode;

                if(exists $created_nodes{$new_node_id})
                {
                    $newNode = $created_nodes{$new_node_id};
                }
                else
                {
                    $newNode = Bio::Tree::Node->new();
                    $new_node_id ||= 'internal_'.$newNode->_creation_id;
                    $newNode->id($new_node_id);

                    $created_nodes{$new_node_id} = $newNode;
                }

                #check if taxa data exists for the current node ($terminal)
                if($taxa) {
                    my $taxon = $terminal->get_taxon();
                    $newNode->add_tag_value("taxon", $taxon->get_name()) if $taxon && $taxon->get_name;
                }

                #check if you've reached the root of the tree and if so, stop.
                if($terminal->is_root()) {
                    $tree->set_root_node($newNode);
                    last;
                }

                #transfer attributes that apply to non-root only nodes
                $newNode->branch_length($terminal->get_branch_length());

                my $parent = $terminal->get_parent();
                my $parentID = $parent->get_name();
                if(exists $created_nodes{$parentID})
                {

                    $created_nodes{$parentID}->add_Descendent($newNode);
                }
                else
                {
                    my $parent_node = Bio::Tree::Node->new();
                    $parentID ||= 'internal_'.$parent_node->_creation_id;
                    $parent_node->id($parentID);
                    $parent_node->add_Descendent($newNode);
                    $created_nodes{$parentID} = $parent_node;
                }
                #remove processed node from tree
                $parent->prune_child($terminal);

                #check if the parent of the removed node is now a terminal node and should be added for processing
                if($parent->is_terminal())
                {
                    push(@$terminals, $terminal->get_parent()) if $terminal->get_parent;
                }
            }
            push @trees, $tree;
            $t = $forest->next();
        }
    }
    return \@trees;
}

=head2 create_bperl_seq

 Title   : create_bperl_seq
 Usage   : my @seqs = $factory->create_bperl_seq($objIO);
 Function: Converts Bio::Phylo::Matrices::Datum objects into L objects
 Returns : an array of L objects
 Args    : Bio::NexmlIO, Bio::SeqIO, Bio::AlignIO, or Bio::TreeIO

see [http://search.cpan.org/~rvosa/Bio-Phylo/lib/Bio/Phylo/Project.pm Bio::Phylo::Project]

=cut

sub create_bperl_seq {
    my($self, $caller) = @_;
    my $matrices = $caller->doc->get_matrices();
    my @seqs;

    foreach my $matrix (@$matrices)
    {
        #check if mol_type is something that makes sense to be a seq
        my $mol_type = lc($matrix->get_type());
        unless ($mol_type eq 'dna' || $mol_type eq 'rna' || $mol_type eq 'protein')
        {
            next;
        }

        my $taxa = $matrix->get_taxa();
        my $seqnum = 0;
        my $taxa_id = $taxa->get_xml_id();
        my $taxa_label = $taxa->get_name();
        my $basename = $matrix->get_name();
        my $row = $matrix->first;
        while ($row)
        {
            my $newSeq = $row->get_char();
            my $feat = Bio::SeqFeature::Generic->new();
            $feat->add_tag_value('matrix_label', $matrix->get_name()) if defined($matrix->get_name);
            $feat->add_tag_value('matrix_id', $matrix->get_xml_id());
            $feat->add_tag_value('NexmlIO_ID', $caller->{_ID});
            $feat->add_tag_value('taxa_id', $taxa_id) if defined($taxa_id);
            $feat->add_tag_value('taxa_label', $taxa_label) if defined($taxa_label);

            $seqnum++;
            #construct full sequence id by using bio::phylo "matrix label" and "row id"
            my $seqID = "$basename.seq_$seqnum";
            my $rowlabel;
            #check if there is a label for the row, if not default to seqID
            if (!defined ($rowlabel = $row->get_name())) {$rowlabel = $seqID;}
            else {$seqID = $rowlabel;}

            #build the seq object using the factory create method
            my $seqbuilder = Bio::Seq::SeqFactory->new('-type' => 'Bio::Seq');
            my $seq = $seqbuilder->create(
                       -seq         => $newSeq,
                       -id          => $rowlabel,
                       -primary_id  => $seqID,
                       #-desc        => $fulldesc,
                       -alphabet    => $mol_type,
                       -direct      => 1,
                       );
            # TODO: should $caller->{_ID} always be defined?
            # ATM, this is a Bio::SeqIO::nexml stream...
            $seq->{_Nexml_ID} = $caller->{_ID} ? $caller->{_ID} . $taxa_id : $taxa_id;
            $seq->{_Nexml_matrix_ID} = $caller->{_ID} ? $caller->{_ID} . $matrix->get_xml_id() : $matrix->get_xml_id();

            #check if taxon linked to sequence if so create feature to attach to alignment
            if ($taxa) {
                my $taxon = $taxa->first;
                while ($taxon) {
                    $feat->add_tag_value('taxon', $taxon->get_name) if defined($taxon->get_name);
                    if($taxon eq $row->get_taxon) {
                        my $taxon_name = $taxon->get_name();

                        $feat->add_tag_value('my_taxon', "$taxon_name") if defined($taxon_name);
                        $feat->add_tag_value('id', $rowlabel);
                    }
                    $taxon = $taxa->next;
                }
            }
            $seq->add_SeqFeature($feat);
            push (@seqs, $seq);

            $row = $matrix->next;
        }
    }
    return \@seqs;
}

=head2 create_bphylo_tree

 Title   : create_bphylo_tree
 Usage   : my $bphylo_tree = $factory->create_bphylo_tree($bperl_tree);
 Function: Converts a L object into Bio::Phylo::Forest::Tree object
 Returns : a Bio::Phylo::Forest::Tree object
 Args    : Bio::Tree::Tree object

=cut

sub create_bphylo_tree {
    my ($self, $bptree, $taxa) = @_;
    #most of the code below ripped form Bio::Phylo::Forest::Tree::new_from_bioperl()d

    my $tree = $fac->create_tree;
    my $class = 'Bio::Phylo::Forest::Tree';

    if ( ref $bptree && $bptree->isa('Bio::Tree::TreeI') ) {
        bless $tree, $class;
        ($tree) = _copy_tree( $tree, $bptree->get_root_node, "", $taxa);

        # copy name
        my $name = $bptree->id;
        $tree->set_name( $name ) if defined $name;

        # copy score
        my $score = $bptree->score;
        $tree->set_score( $score ) if defined $score;
    }
    else {
        $self->throw('Not a bioperl tree!');
    }
    return $tree;
}


sub _copy_tree {
    my ( $tree, $bpnode, $parent, $taxa ) = @_;
        my $node = create_bphylo_node($bpnode);
        my $taxon;
        if ($parent) {
            $parent->set_child($node);
        }
        if (my $bptaxon_name = $bpnode->get_tag_values('taxon'))
        {
            $node->set_taxon($taxa->get_by_name($bptaxon_name));
        }
        $tree->insert($node);
        foreach my $bpchild ( $bpnode->each_Descendent ) {
            _copy_tree( $tree, $bpchild, $node, $taxa );
        }
     return $tree;
}

=head2 create_bphylo_node

 Title   : create_bphylo_node
 Usage   : my $bphylo_node = $factory->create_bphylo_node($bperl_node);
 Function: Converts a L object into Bio::Phylo::Forest::Node object
 Returns : a Bio::Phylo::Forest::Node object
 Args    : L object

=cut

sub create_bphylo_node {
    my ($bpnode) = @_;
        my $node = Bio::Phylo::Forest::Node->new();

        #mostly ripped from Bio::Phylo::Forest::Node->new_from_bioperl()
        # copy name
        my $name = $bpnode->id;
        $node->set_name( $name ) if defined $name;

        # copy branch length
        my $branch_length = $bpnode->branch_length;
        $node->set_branch_length( $branch_length ) if defined $branch_length;

        # copy description
        my $desc = $bpnode->description;
        $node->set_desc( $desc ) if defined $desc;

        # copy bootstrap
        my $bootstrap = $bpnode->bootstrap;
        $node->set_score( $bootstrap ) if defined $bootstrap and looks_like_number $bootstrap;

        # copy other tags
        for my $tag ( $bpnode->get_all_tags ) {
            my @values = $bpnode->get_tag_values( $tag );
            $node->set_generic( $tag => \@values );
        }
        return $node;
    }


=head2 create_bphylo_aln

 Title   : create_bphylo_aln
 Usage   : my $bphylo_aln = $factory->create_bphylo_aln($bperl_aln);
 Function: Converts a L object into Bio::Phylo::Matrices::Matrix object
 Returns : a Bio::Phylo::Matrices::Matrix object
 Args    : Bio::SimpleAlign object

=cut

sub create_bphylo_aln {

    my ($self, $aln, $taxa, @args) = @_;

    #most of the code below ripped from Bio::Phylo::Matrices::Matrix::new_from_bioperl()
    if ( $aln->isa('Bio::Align::AlignI') ) {
            $aln->unmatch;
            $aln->map_chars('\.','-');
            my @seqs = $aln->each_seq;
            my ( $type, $missing, $gap, $matchchar );
            if ( $seqs[0] ) {
                $type = $seqs[0]->alphabet || $seqs[0]->_guess_alphabet || 'dna';
            }
            else {
                $type = 'dna';
            }

            my $matrix = $fac->create_matrix(
                '-type' => $type,
                '-special_symbols' => {
                    '-missing'   => $aln->missing_char || '?',
                    '-matchchar' => $aln->match_char   || '.',
                    '-gap'       => $aln->gap_char     || '-',
                },
                @args
            );
            # XXX create raw getter/setter pairs for annotation, accession, consensus_meta source
            for my $field ( qw(description accession id annotation consensus_meta score source) ) {
                $matrix->$field( $aln->$field );
            }
            my $to = $matrix->get_type_object;
            my @feats = $aln->get_all_SeqFeatures();

            for my $seq ( @seqs ) {
                #create datum linked to taxa
                my $datum = create_bphylo_datum($seq, $taxa, \@feats, '-type_object' => $to);
                $matrix->insert($datum);
            }
            return $matrix;
        }
        else {
            $self->throw('Not a bioperl alignment!');
        }
}



=head2 create_bphylo_seq

 Title   : create_bphylo_seq
 Usage   : my $bphylo_seq = $factory->create_bphylo_seq($bperl_seq);
 Function: Converts a L object into Bio::Phylo::Matrices::Matrix object
 Returns : a Bio::Phylo::Matrices::Matrix object
 Args    : Bio::Seq object

=cut

sub create_bphylo_seq {
    my ($self, $seq, $taxa, @args) = @_;
    my $type    = $seq->alphabet || $seq->_guess_alphabet || 'dna';
    $type = uc($type);

    my $dat = create_bphylo_datum($seq, $taxa, '-type' => $type);

    # copy seq string
    my $seqstring = $seq->seq;
    if ( $seqstring and $seqstring =~ /\S/ ) {
        eval { $dat->set_char( $seqstring ) };
        if ( $@ and UNIVERSAL::isa($@,'Bio::Phylo::Util::Exceptions::InvalidData') ) {
            $self->throw("\n\nThe BioPerl sequence object contains invalid data ($seqstring)\n");
        }
    }

    # copy name
    my $name = $seq->display_id;
    #$dat->set_name( $name ) if defined $name;

    # copy desc
    my $desc = $seq->desc;
    $dat->set_desc( $desc ) if defined $desc;

    #get features from SeqFeatureI
    for my $field ( qw(start end strand) ) {
        $dat->$field( $seq->$field ) if $seq->can($field);
    }
    return $dat;
}

=head2 create_bphylo_taxa

 Title   : create_bphylo_seq
 Usage   : my $taxa = $factory->create_bphylo_taxa($bperl_obj);
 Function: creates a taxa object from the data attached to a bioperl object
 Returns : a Bio::Phylo::Taxa object
 Args    : L object, or L object, or L object

=cut

sub create_bphylo_taxa {
    my $self = shift @_;
    my ($obj) = @_;

    #check if tree or aln object
    if ( UNIVERSAL::isa( $obj, 'Bio::Align::AlignI' ) || UNIVERSAL::isa( $obj, 'Bio::Seq')) {
        return $self->_create_bphylo_matrix_taxa(@_);
    }
    elsif ( UNIVERSAL::isa( $obj, 'Bio::Tree::TreeI' ) ) {
        return $self->_create_bphylo_tree_taxa(@_);
    }
}

sub _create_bphylo_tree_taxa {
    my ($self, $tree) = @_;

    my $taxa = $fac->create_taxa();
    my $taxon;

    #check if taxa exists
    unless ($tree->has_tag('taxa_id')) {
        return 0;
    }

    #copy taxa details
    $taxa->set_xml_id(($tree->get_tag_values('taxa_id'))[0]);
    $taxa->set_name(($tree->get_tag_values('taxa_label'))[0]);

    foreach my $taxon_name ($tree->get_tag_values('taxon')) {

        $taxon = $fac->create_taxon(-name => $taxon_name);
        $taxa->insert($taxon);
    }
    return $taxa;
}

sub _create_bphylo_matrix_taxa {
    my ($self, $aln) = @_;

    my $taxa = $fac->create_taxa();
    my $taxon;
    my @feats = $aln->get_all_SeqFeatures();

    foreach my $feat (@feats) {
    if (my $taxa_id = ($feat->get_tag_values('taxa_id'))[0]) {
        my $taxa_label = ($feat->get_tag_values('taxa_label'))[0];

        $taxa->set_name($taxa_label) if defined $taxa_label;
        $taxa->set_xml_id($taxa_id) if defined $taxa_label;
        my @taxa_bp = $feat->get_tag_values('taxon');
        foreach my $taxon_name (@taxa_bp) {
            $taxon = $fac->create_taxon(-name => $taxon_name);
            $taxa->insert($taxon);
        }
        last;
        }
    }
    return $taxa
}

=head2 create_bphylo_datum

 Title   : create_bphylo_datum
 Usage   : my $bphylo_datum = $factory->create_bphylo_datum($bperl_datum);
 Function: Converts a L object into Bio::Phylo::Matrices::datum object
 Returns : a Bio::Phylo::Matrices::datum object
 Args    : Bio::Seq object, Bio::Phylo::Taxa object,
           [optional] arrayref to SeqFeatures,
           [optional] key => value pairs to pass to Bio::Phylo constructor

=cut

sub create_bphylo_datum {
    #mostly ripped from Bio::Phylo::Matrices::Datum::new_from_bioperl()
    my ( $seq, $taxa, @args ) = @_;
    my $class = 'Bio::Phylo::Matrices::Datum';
    my $feats;
    # want $seq type-check here? Allowable: is-a Bio::PrimarySeq,
        #  Bio::LocatableSeq /maj
    if (@args % 2) { # odd
        $feats = shift @args;
        unless (ref($feats) eq 'ARRAY') {
        Bio::Root::Root->throw("Third argument must be array of SeqFeatures");
        }
    }
        my $type = $seq->alphabet || $seq->_guess_alphabet || 'dna';
        my $self = $class->new( '-type' => $type, @args );
        # copy seq string
        my $seqstring = $seq->seq;
        if ( $seqstring and $seqstring =~ /\S/ ) {
            eval { $self->set_char( $seqstring ) };
            if ( $@ and UNIVERSAL::isa($@,'Bio::Phylo::Util::Exceptions::InvalidData') ) {
                $self->throw("\n\nThe BioPerl sequence object contains invalid data ($seqstring)\n");
            }
        }

        # copy name
        my $name = $seq->display_id;
        $self->set_name( $name ) if defined $name;
        my $taxon;
    my @feats = (defined $feats ? @$feats : $seq->get_all_SeqFeatures);
        # convert taxa
        foreach my $feat (@feats)
        {
            #get sequence id associated with taxa to compare
            my $taxa_id = ($feat->get_tag_values('id'))[0] if $feat->has_tag('id');
            if ($taxa_id && $name eq $taxa_id)
            {
                my $taxon_name;
                if($feat->has_tag('my_taxon')) {
                    $taxon_name = ($feat->get_tag_values('my_taxon'))[0]
                }
                else {
                    $taxon_name = ($feat->get_tag_values('taxon'))[0];
                }
                $self->set_taxon($taxa->get_by_name($taxon_name));
            }
        }

        # copy desc
        my $desc = $seq->desc;
        $self->set_desc( $desc ) if defined $desc;

    # only Bio::LocatableSeq objs have these fields...
        for my $field ( qw(start end strand) ) {
        $self->$field( $seq->$field ) if $seq->can($field);
        }
        return $self;
}

=head2 CREATOR

=cut

=head1 bioperl_create

 Title   : bioperl_create
 Usage   : $bioperl_obj = $fac->bioperl_create($obj_type, $biophylo_proj);
 Function: Create a specified bioperl object using a Bio::Phylo project
 Args    : scalar string ('aln', 'tree', 'seq') type designator
           Bio::Phylo::Project object
 Returns : Appropriate BioPerl object

=cut

sub bioperl_create {
    my $self = shift;
    my ($type, @args) = @_;
    unless (grep /^type/,qw( seq aln tree )) {
    $self->throw("Unrecognized type for argument 1");
    }
    my $call = 'create_bioperl_'.$type;
    return $self->$call(@args);
}

1;