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Summary

Bio::Coordinate::Collection - Noncontinuous match between two coordinate sets

Package variables

Included modules

Inherit

Bio::Coordinate::MapperI Bio::Root::Root

Synopsis

  # create Bio::Coordinate::Pairs or other Bio::Coordinate::MapperIs somehow
  $pair1; $pair2;

  # add them into a Collection
  $collection = Bio::Coordinate::Collection->new;
  $collection->add_mapper($pair1);
  $collection->add_mapper($pair2);

  # create a position and map it
  $pos = Bio::Location::Simple->new (-start => 5, -end => 9 );
  $res = $collection->map($pos);
  $res->match->start == 1;
  $res->match->end == 5;

  # if mapping is many to one (*>1) or many-to-many (*>*)
  # you have to give seq_id not get unrelevant entries
  $pos = Bio::Location::Simple->new
      (-start => 5, -end => 9 -seq_id=>'clone1');

Description

Generic, context neutral mapper to provide coordinate transforms
between two disjoint coordinate systems. It brings into Bioperl the
functionality from Ewan Birney's Bio::EnsEMBL::Mapper ported into
current bioperl.
This class is aimed for representing mapping between whole chromosomes
and contigs, or between contigs and clones, or between sequencing
reads and assembly. The submaps are automatically sorted, so they can
be added in any order.
To map coordinates to the other direction, you have to swap() the
collection. Keeping track of the direction and ID restrictions
are left to the calling code.

Methods

Methods description

 Title   : add_mapper
 Usage   : $obj->add_mapper($mapper)
 Function: Pushes one Bio::Coordinate::MapperI into the list of mappers.
           Sets _is_sorted() to false.
 Example : 
 Returns : 1 when succeeds, 0 for failure.
 Args    : mapper object

 Title   : mappers
 Usage   : $obj->mappers();
 Function: Returns or sets a list of mappers.
 Example : 
 Returns : array of mappers
 Args    : array of mappers

 Title   : each_mapper
 Usage   : $obj->each_mapper();
 Function: Returns a list of mappers.
 Example : 
 Returns : list of mappers
 Args    : none

 Title   : mapper_count
 Usage   : my $count = $collection->mapper_count;
 Function: Get the count of the number of mappers stored 
           in this collection
 Example :
 Returns : integer
 Args    : none

 Title   : swap
 Usage   : $obj->swap;
 Function: Swap the direction of mapping;input <-> output
 Example :
 Returns : 1
 Args    :

 Title   : test
 Usage   : $obj->test;
 Function: test that both components of all pairs are of the same length.
           Ran automatically.
 Example :
 Returns : boolean
 Args    :

 Title   : map
 Usage   : $newpos = $obj->map($pos);
 Function: Map the location from the input coordinate system
           to a new value in the output coordinate system.
 Example :
 Returns : new value in the output coordinate system
 Args    : integer

 Title   : _map
 Usage   : $newpos = $obj->_map($simpleloc);
 Function: Internal method that does the actual mapping. Called multiple times
           by map() if the location  to be mapped is a split location

 Example :
 Returns : new location in the output coordinate system or undef
 Args    : Bio::Location::Simple

 Title   : sort
 Usage   : $obj->sort;
 Function: Sort function so that all mappings are sorted by
           input coordinate start
 Example :
 Returns : 1
 Args    :

 Title   : _is_sorted
 Usage   : $newpos = $obj->_is_sorted;
 Function: toggle for whether the (internal) coodinate mapper data are sorted
 Example :
 Returns : boolean
 Args    : boolean

Methods code

sub new {

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

    $self->{'_mappers'} = [];

    my($in, $out, $strict, $mappers, $return_match) =
	$self->_rearrange([qw(IN
                              OUT
                              STRICT
                              MAPPERS
                              RETURN_MATCH
			     )],
			 @args);

    $in  && $self->in($in);
    $out  && $self->out($out);
    $mappers && $self->mappers($mappers);
    $return_match && $self->return_match('return_match');
    return $self; # success - we hope!

}

sub add_mapper {

  my ($self,$value) = @_;

  $self->throw("Is not a Bio::Coordinate::MapperI but a [$self]")
      unless defined $value && $value->isa('Bio::Coordinate::MapperI');
  
  # test pair range lengths
  $self->warn("Coordinates in pair [". $value . ":" .
	      $value->in->seq_id . "/". $value->out->seq_id .
	      "] are not right.")
      unless $value->test;

  $self->_is_sorted(0);
  push(@{$self->{'_mappers'}},$value);

}

sub mappers {

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

   if (@args) {

       $self->throw("Is not a Bio::Coordinate::MapperI but a [$self]")
	   unless defined $args[0] && $args[0]->isa('Bio::Coordinate::MapperI');
       push(@{$self->{'_mappers'}}, @args);
   }

   return @{$self->{'_mappers'}};

}

sub each_mapper {

   my ($self) = @_;
   return @{$self->{'_mappers'}};

}

sub mapper_count {

   my $self = shift;
   return scalar @{$self->{'_mappers'} || []};

}

sub swap {

   my ($self) = @_;
   use Data::Dumper;

   $self->sort unless $self->_is_sorted;
   map {$_->swap;} @{$self->{'_mappers'}};
   ($self->{'_in_ids'}, $self->{'_out_ids'}) =
       ($self->{'_out_ids'}, $self->{'_in_ids'});
   1;

}

sub test {

   my ($self) = @_;

   my $res = 1;

   foreach my $mapper ($self->each_mapper) {
       unless( $mapper->test ) {
	   $self->warn("Coordinates in pair [". $mapper . ":" .
		       $mapper->in->seq_id . "/". $mapper->out->seq_id .
		       "] are not right."); 
	   $res = 0;
       }
   }
   $res;

}

sub map {

   my ($self,$value) = @_;

   $self->throw("Need to pass me a value.")
       unless defined $value;
   $self->throw("I need a Bio::Location, not [$value]")
       unless $value->isa('Bio::LocationI');
   $self->throw("No coordinate mappers!")
       unless $self->each_mapper;

   $self->sort unless $self->_is_sorted;


   if ($value->isa("Bio::Location::SplitLocationI")) {

       my $result = Bio::Coordinate::Result->new();
       foreach my $loc ( $value->sub_Location(1) ) {

           my $res = $self->_map($loc);
           map { $result->add_sub_Location($_) } $res->each_Location;

       }
       return $result;

   } else {
       return $self->_map($value);
   }

}

sub _map {

   my ($self,$value) = @_;

   my $result = Bio::Coordinate::Result->new(-is_remote=>1);

IDMATCH: {

       # bail out now we if are forcing the use of an ID 
       # and it is not in this collection
       last IDMATCH if defined $value->seq_id && 
	   ! $self->{'_in_ids'}->{$value->seq_id};

       foreach my $pair ($self->each_mapper) {

	   # if we are limiting input to a certain ID
	   next if defined $value->seq_id && $value->seq_id ne $pair->in->seq_id;

	   # if we haven't even reached the start, move on
	   next if $pair->in->end < $value->start;
	   # if we have over run, break
	   last if $pair->in->start > $value->end;

	   my $subres = $pair->map($value);
	   $result->add_result($subres);
       }
   }

   $result->seq_id($result->match->seq_id) if $result->match;
   unless ($result->each_Location) {
       #build one gap;
       my $gap = Bio::Location::Simple->new(-start => $value->start,
					    -end => $value->end,
					    -strand => $value->strand,
					    -location_type => $value->location_type
					   );
       $gap->seq_id($value->seq_id) if defined $value->seq_id;
       bless $gap, 'Bio::Coordinate::Result::Gap';
       $result->seq_id($value->seq_id) if defined $value->seq_id;
       $result->add_sub_Location($gap);
   }
   return $result;

}

sub sort {

   my ($self) = @_;

   @{$self->{'_mappers'}} = map { $_->[0] }
                            sort { $a->[1] <=> $b->[1] }
                            map { [ $_, $_->in->start] } 
                            @{$self->{'_mappers'}};

   #create hashes for sequence ids
   $self->{'_in_ids'} = ();
   $self->{'_out_ids'} = ();
   foreach ($self->each_mapper) {
       $self->{'_in_ids'}->{$_->in->seq_id} = 1;
       $self->{'_out_ids'}->{$_->out->seq_id} = 1;
   }

   $self->_is_sorted(1);

}

sub _is_sorted {

   my ($self,$value) = @_;

   $self->{'_is_sorted'} = 1 if defined $value && $value;
   return $self->{'_is_sorted'};
}

1;

}

General documentation

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 lists Your participation is much appreciated.

  bioperl-l@bioperl.org                  - General discussion
  http://bioperl.org/wiki/Mailing_lists  - About the mailing lists

Please direct usage questions or support issues to the mailing list:
bioperl-l@bioperl.org
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.

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

  https://redmine.open-bio.org/projects/bioperl/

Email: heikki-at-bioperl-dot-org

Ewan Birney, birney@ebi.ac.uk

The rest of the documentation details each of the object
methods. Internal methods are usually preceded with a _