Raw content of Bio::Ontology::Relationship
<![CDATA[# $Id: Relationship.pm,v 1.4.2.3 2003/03/27 10:07:56 lapp Exp $
#
# BioPerl module for Relationship
#
# Cared for by Christian M. Zmasek <czmasek@gnf.org> or <cmzmasek@yahoo.com>
#
# (c) Christian M. Zmasek, czmasek@gnf.org, 2002.
# (c) GNF, Genomics Institute of the Novartis Research Foundation, 2002.
#
# You may distribute this module under the same terms as perl itself.
# Refer to the Perl Artistic License (see the license accompanying this
# software package, or see http://www.perl.com/language/misc/Artistic.html)
# for the terms under which you may use, modify, and redistribute this module.
#
# THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# You may distribute this module under the same terms as perl itself
# POD documentation - main docs before the code
=head1 NAME
Relationship - a relationship for an ontology
=head1 SYNOPSIS
$rel = Bio::Ontology::Relationship->new( -identifier => "16847",
-subject_term => $subj,
-object_term => $obj,
-predicate_term => $pred );
=head1 DESCRIPTION
This is a basic implementation of Bio::Ontology::RelationshipI.
The terminology we use here is the one commonly used for ontologies,
namely the triple of (subject, predicate, object), which in addition
is scoped in a namespace (ontology). It is called triple because it is
a tuple of three ontology terms.
There are other terminologies in use for expressing relationships. For
those who it helps to better understand the concept, the triple of
(child, relationship type, parent) would be equivalent to the
terminology chosen here, disregarding the question whether the notion
of parent and child is sensible in the context of the relationship
type or not. Especially in the case of ontologies with a wide variety
of predicates the parent/child terminology and similar ones can
quickly become ambiguous (e.g., A synthesises B), meaningless (e.g., A
binds B), or even conflicting (e.g., A is-parent-of B), and are
therefore strongly discouraged.
=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 lists Your participation is much appreciated.
bioperl-l@bioperl.org - General discussion
http://bio.perl.org/MailList.html - About the mailing lists
=head2 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://bugzilla.bioperl.org/
=head1 AUTHOR
Christian M. Zmasek
Email: czmasek@gnf.org or cmzmasek@yahoo.com
WWW: http://www.genetics.wustl.edu/eddy/people/zmasek/
Address:
Genomics Institute of the Novartis Research Foundation
10675 John Jay Hopkins Drive
San Diego, CA 92121
=head1 CONTRIBUTORS
Hilmar Lapp, email: hlapp at gmx.net
=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::Ontology::Relationship;
use vars qw( @ISA );
use strict;
use Bio::Root::Root;
use Bio::Ontology::TermI;
use Bio::Ontology::RelationshipI;
@ISA = qw( Bio::Root::Root
Bio::Ontology::RelationshipI );
=head2 new
Title : new
Usage : $rel = Bio::Ontology::Relationship->new(-identifier => "16847",
-subject_term => $subject,
-object_term => $object,
-predicate_term => $type );
Function: Creates a new Bio::Ontology::Relationship.
Returns : A new Bio::Ontology::Relationship object.
Args : -identifier => the identifier of this relationship [scalar]
-subject_term => the subject term [Bio::Ontology::TermI]
-object_term => the object term [Bio::Ontology::TermI]
-predicate_term => the predicate term [Bio::Ontology::TermI]
=cut
sub new {
my( $class, @args ) = @_;
my $self = $class->SUPER::new( @args );
my ( $identifier,
$subject_term,
$child, # for backwards compatibility
$object_term,
$parent, # for backwards compatibility
$predicate_term,
$reltype, # for backwards compatibility
$ont)
= $self->_rearrange( [qw( IDENTIFIER
SUBJECT_TERM
CHILD_TERM
OBJECT_TERM
PARENT_TERM
PREDICATE_TERM
RELATIONSHIP_TYPE
ONTOLOGY)
], @args );
$self->init();
$self->identifier( $identifier );
$subject_term = $child unless $subject_term;
$object_term = $parent unless $object_term;
$predicate_term = $reltype unless $predicate_term;
$self->subject_term( $subject_term) if $subject_term;
$self->object_term( $object_term) if $object_term;
$self->predicate_term( $predicate_term ) if $predicate_term;
$self->ontology($ont) if $ont;
return $self;
} # new
=head2 init
Title : init()
Usage : $rel->init();
Function: Initializes this Relationship to all undef.
Returns :
Args :
=cut
sub init {
my( $self ) = @_;
$self->{ "_identifier" } = undef;
$self->{ "_subject_term" } = undef;
$self->{ "_object_term" } = undef;
$self->{ "_predicate_term" } = undef;
$self->ontology(undef);
} # init
=head2 identifier
Title : identifier
Usage : $rel->identifier( "100050" );
or
print $rel->identifier();
Function: Set/get for the identifier of this Relationship.
Returns : The identifier [scalar].
Args : The identifier [scalar] (optional).
=cut
sub identifier {
my ( $self, $value ) = @_;
if ( defined $value ) {
$self->{ "_identifier" } = $value;
}
return $self->{ "_identifier" };
} # identifier
=head2 subject_term
Title : subject_term
Usage : $rel->subject_term( $subject );
or
$subject = $rel->subject_term();
Function: Set/get for the subject term of this Relationship.
The common convention for ontologies is to express
relationships between terms as triples (subject, predicate,
object).
Returns : The subject term [Bio::Ontology::TermI].
Args : The subject term [Bio::Ontology::TermI] (optional).
=cut
sub subject_term {
my ( $self, $term ) = @_;
if ( defined $term ) {
$self->_check_class( $term, "Bio::Ontology::TermI" );
$self->{ "_subject_term" } = $term;
}
return $self->{ "_subject_term" };
} # subject_term
=head2 object_term
Title : object_term
Usage : $rel->object_term( $object );
or
$object = $rel->object_term();
Function: Set/get for the object term of this Relationship.
The common convention for ontologies is to express
relationships between terms as triples (subject, predicate,
object).
Returns : The object term [Bio::Ontology::TermI].
Args : The object term [Bio::Ontology::TermI] (optional).
=cut
sub object_term {
my ( $self, $term ) = @_;
if ( defined $term ) {
$self->_check_class( $term, "Bio::Ontology::TermI" );
$self->{ "_object_term" } = $term;
}
return $self->{ "_object_term" };
}
=head2 predicate_term
Title : predicate_term
Usage : $rel->predicate_term( $type );
or
$type = $rel->predicate_term();
Function: Set/get for the predicate (relationship type) of this
relationship.
The common convention for ontologies is to express
relationships between terms as triples (subject, predicate,
object).
Returns : The predicate term [Bio::Ontology::TermI].
Args : The predicate term [Bio::Ontology::TermI] (optional).
=cut
sub predicate_term {
my ( $self, $term ) = @_;
if ( defined $term ) {
$self->_check_class( $term, "Bio::Ontology::TermI" );
$self->{ "_predicate_term" } = $term;
}
return $self->{ "_predicate_term" };
}
=head2 ontology
Title : ontology
Usage : $ont = $obj->ontology()
Function: Get/set the ontology that defined this relationship.
Example :
Returns : an object implementing L<Bio::Ontology::OntologyI>
Args : on set, undef or an object implementing
L<Bio::Ontology::OntologyI> (optional)
=cut
sub ontology{
my $self = shift;
my $ont;
if(@_) {
$ont = shift;
if($ont) {
$ont = Bio::Ontology::Ontology->new(-name => $ont) if ! ref($ont);
if(! $ont->isa("Bio::Ontology::OntologyI")) {
$self->throw(ref($ont)." does not implement ".
"Bio::Ontology::OntologyI. Bummer.");
}
}
return $self->{"_ontology"} = $ont;
}
return $self->{"_ontology"};
}
=head2 to_string
Title : to_string()
Usage : print $rel->to_string();
Function: to_string method for Relationship.
Returns : A string representation of this Relationship.
Args :
=cut
sub to_string {
my( $self ) = @_;
local $^W = 0;
my $s = "";
$s .= "-- Identifier:\n";
$s .= $self->identifier()."\n";
$s .= "-- Subject Term Identifier:\n";
$s .= $self->subject_term()->identifier()."\n";
$s .= "-- Object Term Identifier:\n";
$s .= $self->object_term()->identifier()."\n";
$s .= "-- Relationship Type Identifier:\n";
$s .= $self->predicate_term()->identifier();
return $s;
} # to_string
sub _check_class {
my ( $self, $value, $expected_class ) = @_;
if ( ! defined( $value ) ) {
$self->throw( "Found [undef] where [$expected_class] expected" );
}
elsif ( ! ref( $value ) ) {
$self->throw( "Found [scalar] where [$expected_class] expected" );
}
elsif ( ! $value->isa( $expected_class ) ) {
$self->throw( "Found [" . ref( $value ) . "] where [$expected_class] expected" );
}
} # _check_type
#################################################################
# aliases for backwards compatibility
#################################################################
=head1 Deprecated Methods
These methods are deprecated and defined here solely to preserve
backwards compatibility.
=cut
*child_term = \&subject_term;
*parent_term = \&object_term;
*relationship_type = \&predicate_term;
1;
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