Ewan Birney

NAME

Bio::LocationI - Abstract interface of a Location on a Sequence

SYNOPSIS

    # get a LocationI somehow
    printf( "start = %d, end = %d, strand = %s, seq_id = %s\n", 
            $location->start, $location->end, $location->strand,
            $location->seq_id);
    print "location str is ", $location->to_FTstring(), "\n"; 

DESCRIPTION

This Interface defines the methods for a Bio::LocationI, an object which encapsulates a location on a biological sequence. Locations need not be attached to actual sequences as they are stand alone objects. LocationI objects are used by Bio::SeqFeatureI objects to manage and represent locations for a Sequence Feature.

FEEDBACK

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

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://bio.perl.org/bioperl-bugs/

AUTHOR - Jason Stajich

Email jason@bioperl.org

APPENDIX

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

location_type

  Title   : location_type
  Usage   : my $location_type = $location->location_type();
  Function: Get location type encoded as text
  Returns : string ('EXACT', 'WITHIN', 'BETWEEN')
  Args    : none

start

  Title   : start
  Usage   : $start = $location->start();
  Function: Get the start coordinate of this location as defined by the
            currently active coordinate computation policy. In simple cases,
            this will return the same number as min_start() and max_start(),
            in more ambiguous cases like fuzzy locations the number may be
            equal to one or neither of both.

            We override this here from RangeI in order to delegate
            'get' to a L<Bio::Location::CoordinatePolicy> implementing
            object.  Implementing classes may also wish to provide
            'set' functionality, in which case they *must* override
            this method. The implementation provided here will throw
            an exception if called with arguments.

  Returns : A positive integer value.
  Args    : none

end

  Title   : end
  Usage   : $end = $location->end();
  Function: Get the end coordinate of this location as defined by the
            currently active coordinate computation policy. In simple cases,
            this will return the same number as min_end() and max_end(),
            in more ambiguous cases like fuzzy locations the number may be
            equal to one or neither of both.

            We override this here from L<Bio::RangeI> in order to delegate
            'get' to a L<Bio::Location::CoordinatePolicy> implementing
            object. Implementing classes may also wish to provide
            'set' functionality, in which case they *must* override
            this method. The implementation provided here will throw
            an exception if called with arguments.

  Returns : A positive integer value.
  Args    : none

min_start

  Title   : min_start
  Usage   : my $minstart = $location->min_start();
  Function: Get minimum starting point of feature.

            Note that an implementation must not call start() in this method.

  Returns : integer or undef if no minimum starting point.
  Args    : none

max_start

  Title   : max_start
  Usage   : my $maxstart = $location->max_start();
  Function: Get maximum starting point of feature.

            Note that an implementation must not call start() in this method
            unless start() is overridden such as not to delegate to the
            coordinate computation policy object.

  Returns : integer or undef if no maximum starting point.
  Args    : none

start_pos_type

  Title   : start_pos_type
  Usage   : my $start_pos_type = $location->start_pos_type();
  Function: Get start position type encoded as text

            Known valid values are 'BEFORE' (<5..100), 'AFTER' (>5..100), 
            'EXACT' (5..100), 'WITHIN' ((5.10)..100), 'BETWEEN', (5^6), with
            their meaning best explained by their GenBank/EMBL location string
            encoding in brackets.

  Returns : string ('BEFORE', 'AFTER', 'EXACT','WITHIN', 'BETWEEN')
  Args    : none

min_end

  Title   : min_end
  Usage   : my $minend = $location->min_end();
  Function: Get minimum ending point of feature. 

            Note that an implementation must not call end() in this method
            unless end() is overridden such as not to delegate to the
            coordinate computation policy object.

  Returns : integer or undef if no minimum ending point.
  Args    : none

max_end

  Title   : max_end
  Usage   : my $maxend = $location->max_end();
  Function: Get maximum ending point of feature.

            Note that an implementation must not call end() in this method
            unless end() is overridden such as not to delegate to the
            coordinate computation policy object.

  Returns : integer or undef if no maximum ending point.
  Args    : none

end_pos_type

  Title   : end_pos_type
  Usage   : my $end_pos_type = $location->end_pos_type();
  Function: Get end position encoded as text.

            Known valid values are 'BEFORE' (5..<100), 'AFTER' (5..>100), 
            'EXACT' (5..100), 'WITHIN' (5..(90.100)), 'BETWEEN', (5^6), with
            their meaning best explained by their GenBank/EMBL location string
            encoding in brackets.

  Returns : string ('BEFORE', 'AFTER', 'EXACT','WITHIN', 'BETWEEN')
  Args    : none

seq_id

  Title   : seq_id
  Usage   : my $seqid = $location->seq_id();
  Function: Get/Set seq_id that location refers to
  Returns : seq_id (a string)
  Args    : [optional] seq_id value to set

coordinate_policy

  Title   : coordinate_policy
  Usage   : $policy = $location->coordinate_policy();
            $location->coordinate_policy($mypolicy); # set may not be possible
  Function: Get the coordinate computing policy employed by this object.

            See Bio::Location::CoordinatePolicyI for documentation about
            the policy object and its use.

            The interface *does not* require implementing classes to accept
            setting of a different policy. The implementation provided here
            does, however, allow to do so.

            Implementors of this interface are expected to initialize
            every new instance with a
            L<Bio::Location::CoordinatePolicyI> object. The
            implementation provided here will return a default policy
            object if none has been set yet. To change this default
            policy object call this method as a class method with an
            appropriate argument. Note that in this case only
            subsequently created Location objects will be affected.

  Returns : A L<Bio::Location::CoordinatePolicyI> implementing object.
  Args    : On set, a L<Bio::Location::CoordinatePolicyI> implementing object.

to_FTstring

  Title   : to_FTstring
  Usage   : my $locstr = $location->to_FTstring()
  Function: returns the FeatureTable string of this location
  Returns : string
  Args    : none