=head1 LICENSE

Copyright [1999-2015] Wellcome Trust Sanger Institute and the EMBL-European Bioinformatics Institute
Copyright [2016-2017] EMBL-European Bioinformatics Institute

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

=cut


=head1 CONTACT

  Please email comments or questions to the public Ensembl
  developers list at <http://lists.ensembl.org/mailman/listinfo/dev>.

  Questions may also be sent to the Ensembl help desk at
  <http://www.ensembl.org/Help/Contact>.

=cut

=head1 NAME

Bio::EnsEMBL::IdMapping::TinyGene - lightweight gene object

=head1 SYNOPSIS

 # fetch a gene from the db and create a lightweight gene object from it
  my $gene = $gene_adaptor->fetch_by_stable_id('ENSG000345437');
  my $lightweight_gene = Bio::EnsEMBL::IdMapping::TinyGene->new_fast( [
      $gene->dbID,                   $gene->stable_id,
      $gene->version,                $gene->created_date,
      $gene->modified_date,          $gene->start,
      $gene->end,                    $gene->strand,
      $gene->slice->seq_region_name, $gene->biotype,
      $gene->analysis->logic_name,
  ] );

=head1 DESCRIPTION

This is a lightweight gene object for the stable Id mapping. See the
documentation in TinyFeature for general considerations about its
design.

=head1 METHODS

  start
  end
  strand
  seq_region_name
  biotype
  logic_name
  add_Transcript
  get_all_Transcripts
  length

=cut

package Bio::EnsEMBL::IdMapping::TinyGene;

# internal data structure (array indices):
#
#  0-4 see TinyFeature
#  5  start
#  6  end
#  7  strand
#  8  seq_region_name
#  9  biotype
# 10  logic_name
# 11  [transcripts]


use strict;
use warnings;
no warnings 'uninitialized';

use Bio::EnsEMBL::IdMapping::TinyFeature;
our @ISA = qw(Bio::EnsEMBL::IdMapping::TinyFeature);

use Bio::EnsEMBL::Utils::Exception qw(throw warning);


=head2 start

  Arg[1]      : (optional) Int - the gene's start coordinate
  Description : Getter/setter for the gene's start coordinate.
  Return type : Int
  Exceptions  : none
  Caller      : general
  Status      : At Risk
              : under development

=cut

sub start {
  my $self = shift;
  $self->[5] = shift if (@_);
  return $self->[5];
}


=head2 end

  Arg[1]      : (optional) Int - the gene's end coordinate
  Description : Getter/setter for the gene's end coordinate.
  Return type : Int
  Exceptions  : none
  Caller      : general
  Status      : At Risk
              : under development

=cut

sub end {
  my $self = shift;
  $self->[6] = shift if (@_);
  return $self->[6];
}


=head2 strand

  Arg[1]      : (optional) Int - the gene's strand
  Description : Getter/setter for the gene's strand.
  Return type : Int
  Exceptions  : none
  Caller      : general
  Status      : At Risk
              : under development

=cut

sub strand {
  my $self = shift;
  $self->[7] = shift if (@_);
  return $self->[7];
}


=head2 seq_region_name

  Arg[1]      : (optional) String - seq_region name
  Description : Getter/setter for the seq_region name of the slice the gene is
                on.
  Return type : String
  Exceptions  : none
  Caller      : general
  Status      : At Risk
              : under development

=cut

sub seq_region_name {
  my $self = shift;
  $self->[8] = shift if (@_);
  return $self->[8];
}


=head2 biotype

  Arg[1]      : (optional) String - the gene's biotype
  Description : Getter/setter for the gene's biotype.
  Return type : String
  Exceptions  : none
  Caller      : general
  Status      : At Risk
              : under development

=cut

sub biotype {
  my $self = shift;
  $self->[9] = shift if (@_);
  return $self->[9];
}



=head2 logic_name

  Arg[1]      : (optional) String - the gene's analysis' logic_name
  Description : Getter/setter for the gene's analysis' logic_name.
  Return type : String
  Exceptions  : none
  Caller      : general
  Status      : At Risk
              : under development

=cut

sub logic_name {
  my $self = shift;
  $self->[10] = shift if (@_);
  return $self->[10];
}



=head2 add_Transcript

  Arg[1]      : Bio::EnsEMBL::IdMapping::TinyTranscript $tr - the transcript to
                add
  Example     : $tiny_gene->add_Transcript($tiny_transcript);
  Description : Adds a transcript to a gene.
  Return type : none
  Exceptions  : thrown on wrong or missing argument
  Caller      : general
  Status      : At Risk
              : under development

=cut

sub add_Transcript {
  my $self = shift;
  my $tr = shift;

  unless ($tr && $tr->isa('Bio::EnsEMBL::IdMapping::TinyTranscript')) {
    throw('Need a Bio::EnsEMBL::IdMapping::TinyTranscript.');
  }

  push @{ $self->[11] }, $tr;
}


=head2 get_all_Transcripts

  Example     : foreach my $tr (@{ $tiny_gene->get_all_Transcripts }) {
                  # do something with transcript
                }
  Description : Returns all transcripts attached to that gene.
  Return type : Arrayref of Bio::EnsEMBL::IdMapping::TinyTranscript objects
  Exceptions  : none
  Caller      : general
  Status      : At Risk
              : under development

=cut

sub get_all_Transcripts {
  return $_[0]->[11] || [];
}


=head2 length

  Description : Returns the gene length (distance between start and end).
  Return type : Int
  Exceptions  : none
  Caller      : general
  Status      : At Risk
              : under development

=cut

sub length {
  my $self = shift;
  return ($self->end - $self->start + 1);
}


1;

