# Comment.pm,v 1.12 2005/02/02 22:13:22 allenday Exp
#
# BioPerl module for Bio::Annotation::Comment
#
# Cared for by Ewan Birney <birney@ebi.ac.uk>
#
# Copyright Ewan Birney
#
# You may distribute this module under the same terms as perl itself

# POD documentation - main docs before the code

=head1 NAME

Bio::Annotation::Comment - A comment object, holding text

=head1 SYNOPSIS


    $comment = Bio::Annotation::Comment->new();
    $comment->text("This is the text of this comment");
    $annotation->add_Annotation('comment', $comment);


=head1 DESCRIPTION

A holder for comments in annotations, just plain text. This is a very simple
object, and justifiably so.

=head1 CONTACT

Describe contact details here

=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::Annotation::Comment;
use vars qw(@ISA);
use strict;
use overload '""' => sub { $_[0]->text || ''};
use overload 'eq' => sub { "$_[0]" eq "$_[1]" };

use Bio::Root::Root;
use Bio::AnnotationI;

@ISA = qw(Bio::Root::Root Bio::AnnotationI);

=head2 new

 Title   : new
 Usage   : $comment = Bio::Annotation::Comment->new( '-text' => 'some text for this comment');
 Function: This returns a new comment object, optionally with
           text filed
 Example :
 Returns : a Bio::Annotation::Comment object
 Args    : a hash with -text optionally set


=cut


sub new {
  my($class,@args) = @_;

  my $self = $class->SUPER::new(@args);
  my ($text,$tag) = $self->_rearrange([qw(TEXT TAGNAME)], @args);

  defined $text && $self->text($text);
  defined $tag && $self->tagname($tag);

  return $self;
}

=head1 AnnotationI implementing functions

=cut

=head2 as_text

 Title   : as_text
 Usage   :
 Function:
 Example :
 Returns : 
 Args    :


=cut

sub as_text{
   my ($self) = @_;

   return "Comment: ".$self->text;
}

=head2 hash_tree

 Title   : hash_tree
 Usage   :
 Function:
 Example :
 Returns : 
 Args    :


=cut

sub hash_tree{
    my $self = shift;
   
    my $h = {};
    $h->{'text'} = $self->text;
    return $h;
}

=head2 tagname

 Title   : tagname
 Usage   : $obj->tagname($newval)
 Function: Get/set the tagname for this annotation value.

           Setting this is optional. If set, it obviates the need to
           provide a tag to Bio::AnnotationCollectionI when adding
           this object. When obtaining an AnnotationI object from the
           collection, the collection will set the value to the tag
           under which it was stored unless the object has a tag
           stored already.

 Example : 
 Returns : value of tagname (a scalar)
 Args    : new value (a scalar, optional)


=cut

sub tagname{
    my ($self,$value) = @_;
    if( defined $value) {
	$self->{'tagname'} = $value;
    }
    return $self->{'tagname'};
}

=head1 Specific accessors for Comments

=cut


=head2 text

 Title   : text
 Usage   : $value = $self->text($newval)
 Function: get/set for the text field. A comment object
           just holds a single string which is accessible through
           this method
 Example : 
 Returns : value of text
 Args    : newvalue (optional)


=cut

sub text{
   my ($self,$value) = @_;
   if( defined $value) {
      $self->{'text'} = $value;
    }
    return $self->{'text'};

}



1;
