Raw content of Bio::Ontology::Ontology
<![CDATA[# $Id: Ontology.pm,v 1.2.2.4 2003/03/27 10:07:56 lapp Exp $
#
# BioPerl module for Bio::Ontology::Ontology
#
# Cared for by Hilmar Lapp <hlapp at gmx.net>
#
# Copyright Hilmar Lapp
#
# You may distribute this module under the same terms as perl itself
#
# (c) Hilmar Lapp, hlapp at gmx.net, 2003.
# (c) GNF, Genomics Institute of the Novartis Research Foundation, 2003.
#
# 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.
#
# POD documentation - main docs before the code
=head1 NAME
Bio::Ontology::Ontology - standard implementation of an Ontology
=head1 SYNOPSIS
use Bio::Ontology::Ontology;
# create ontology object
my $ont = Bio::Ontology::Ontology->new(-name => "OBF");
# add terms, relationships ...
my $bp = Bio::Ontology::Term->new(-name => "Bioperl");
my $obf = Bio::Ontology::Term->new(-name => "OBF");
my $partof = Bio::Ontology::RelationshipType->get_instance("PART_OF");
$ont->add_term($bp);
$ont->add_term($obf);
$ont->add_relationship($bp, $obf, $partof);
# then query
my @terms = $ont->get_root_terms(); # "OBF"
my @desc = $ont->get_descendant_terms($terms[0], $partof); # "Bioperl"
# ... see methods for other ways to query
# for advanced users, you can re-use the query engine outside of an
# ontology to let one instance manage multiple ontologies
my $ont2 = Bio::Ontology::Ontology->new(-name => "Foundations",
-engine => $ont->engine());
=head1 DESCRIPTION
This is a no-frills implementation of L<Bio::Ontology::OntologyI>.
The query functions are implemented by delegation to an
OntologyEngineI implementation.
=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 list. Your participation is much appreciated.
bioperl-l@bioperl.org - General discussion
http://bioperl.org/MailList.shtml - About the mailing lists
=head2 Reporting Bugs
Report bugs to the Bioperl bug tracking system to help us keep track
of the bugs and their resolution. Bug reports can be submitted via
the web:
http://bugzilla.bioperl.org/
=head1 AUTHOR - Hilmar Lapp
Email hlapp at gmx.net
=head1 CONTRIBUTORS
Additional contributors names and emails 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::Ontology::Ontology;
use vars qw(@ISA);
use strict;
# Object preamble - inherits from Bio::Root::Root
use Bio::Root::Root;
use Bio::Ontology::OntologyI;
use Bio::Ontology::SimpleOntologyEngine;
@ISA = qw(Bio::Root::Root Bio::Ontology::OntologyI);
=head2 new
Title : new
Usage : my $obj = new Bio::Ontology::Ontology();
Function: Builds a new Bio::Ontology::Ontology object
Returns : an instance of Bio::Ontology::Ontology
Args :
=cut
sub new {
my($class,@args) = @_;
my $self = $class->SUPER::new(@args);
my ($name,$auth,$def,$id,$engine) =
$self->_rearrange([qw(NAME
AUTHORITY
DEFINITION
IDENTIFIER
ENGINE)
],
@args);
defined($name) && $self->name($name);
defined($auth) && $self->authority($auth);
defined($def) && $self->definition($def);
defined($id) && $self->identifier($id);
$engine = Bio::Ontology::SimpleOntologyEngine->new() unless $engine;
$self->engine($engine);
return $self;
}
=head1 Methods from L<Bio::Ontology::OntologyI>
=cut
=head2 name
Title : name
Usage : $obj->name($newval)
Function: Get/set the name of the ontology.
Example :
Returns : value of name (a scalar)
Args : on set, new value (a scalar or undef, optional)
=cut
sub name{
my $self = shift;
return $self->{'name'} = shift if @_;
return $self->{'name'};
}
=head2 authority
Title : authority
Usage : $obj->authority($newval)
Function: Get/set the authority for this ontology, for instance the
DNS base for the organization granting the name of the
ontology and identifiers for the terms.
This attribute is optional and should not generally
expected by applications to have been set. It is here to
follow the rules for namespaces, which ontologies serve as
for terms.
Example :
Returns : value of authority (a scalar)
Args : on set, new value (a scalar or undef, optional)
=cut
sub authority{
my $self = shift;
return $self->{'authority'} = shift if @_;
return $self->{'authority'};
}
=head2 definition
Title : definition
Usage : $obj->definition($newval)
Function: Get/set a descriptive definition of the ontology.
Example :
Returns : value of definition (a scalar)
Args : on set, new value (a scalar or undef, optional)
=cut
sub definition{
my $self = shift;
return $self->{'definition'} = shift if @_;
return $self->{'definition'};
}
=head2 identifier
Title : identifier
Usage : $id = $obj->identifier()
Function: Get an identifier for this ontology.
This is primarily intended for look-up purposes. The value
is not modifiable and is determined automatically by the
implementation. Also, the identifier's uniqueness will only
hold within the scope of a particular application's run
time since it is derived from a memory location.
Example :
Returns : value of identifier (a scalar)
Args :
=cut
sub identifier{
my $self = shift;
if(@_) {
$self->throw("cannot modify identifier for ".ref($self))
if exists($self->{'identifier'});
my $id = shift;
$self->{'identifier'} = $id if $id;
}
if(! exists($self->{'identifier'})) {
($self->{'identifier'}) = "$self" =~ /(0x[0-9a-fA-F]+)/;
}
return $self->{'identifier'};
}
=head2 close
Title : close
Usage :
Function: Release any resources this ontology may occupy. In order
to efficiently release unused memory or file handles, you
should call this method once you are finished with an
ontology.
Example :
Returns : TRUE on success and FALSE otherwise
Args : none
=cut
sub close{
my $self = shift;
# if it is in the ontology store, remove it from there
my $store = Bio::Ontology::OntologyStore->get_instance();
$store->remove_ontology($self);
# essentially we need to dis-associate from the engine here
$self->engine(undef);
return 1;
}
=head1 Implementation-specific public methods
=cut
=head2 engine
Title : engine
Usage : $engine = $obj->engine()
Function: Get/set the ontology engine to which all the query methods
delegate.
Example :
Returns : an object implementing L<Bio::Ontology::OntologyEngineI>
Args : on set, new value (an object implementing
L<Bio::Ontology::OntologyEngineI>, or undef)
=cut
sub engine{
my $self = shift;
if(@_) {
my $engine = shift;
if($engine && (! (ref($engine) &&
$engine->isa("Bio::Ontology::OntologyEngineI")))) {
$self->throw("object of class ".ref($engine)." does not implement".
" Bio::Ontology::OntologyEngineI. Bummer!");
}
$self->{'engine'} = $engine;
}
return $self->{'engine'};
}
=head1 Methods defined in L<Bio::Ontology::OntologyEngineI>
=cut
=head2 add_term
Title : add_term
Usage : add_term(TermI term): TermI
Function: Adds TermI object to the ontology engine term store
If the ontology property of the term object was not set,
this implementation will set it to itself upon adding the
term.
Example : $oe->add_term($term)
Returns : its argument.
Args : object of class TermI.
=cut
sub add_term{
my $self = shift;
my $term = shift;
# set ontology if not set already
$term->ontology($self) if $term && (! $term->ontology());
return $self->engine->add_term($term,@_);
}
=head2 add_relationship
Title : add_relationship
Usage : add_relationship(RelationshipI relationship): RelationshipI
add_relatioship(TermI subject, TermI predicate, TermI object)
Function: Adds a relationship object to the ontology engine.
Example :
Returns : Its argument.
Args : A RelationshipI object.
=cut
sub add_relationship{
my $self = shift;
my $rel = shift;
if($rel && $rel->isa("Bio::Ontology::TermI")) {
# we need to construct the relationship object on the fly
my ($predicate,$object) = @_;
$rel = Bio::Ontology::Relationship->new(-subject_term => $rel,
-object_term => $object,
-predicate_term => $predicate,
-ontology => $self);
}
# set ontology if not set already
$rel->ontology($self) unless $rel->ontology();
return $self->engine->add_relationship($rel);
}
=head2 get_relationships
Title : get_relationships
Usage : get_relationships(TermI term): RelationshipI[]
Function: Retrieves all relationship objects in the ontology, or all
relationships of a given term.
Example :
Returns : Array of Bio::Ontology::RelationshipI objects
Args : Optionally, a Bio::Ontology::TermI compliant object
=cut
sub get_relationships{
my $self = shift;
my $term = shift;
if($term) {
# we don't need to filter in this case
return $self->engine->get_relationships($term);
}
# else we need to filter by ontology
return grep { my $ont = $_->ontology;
# the first condition is a superset of the second, but
# we add it here for efficiency reasons, as many times
# it will short-cut to true and is supposedly faster than
# string comparison
($ont == $self) || ($ont->name eq $self->name);
} $self->engine->get_relationships(@_);
}
=head2 get_predicate_terms
Title : get_predicate_terms
Usage : get_predicate_terms(): TermI[]
Function: Retrieves all relationship types.
Example :
Returns : Array of TermI objects
Args :
=cut
sub get_predicate_terms{
my $self = shift;
return grep { $_->ontology->name eq $self->name;
} $self->engine->get_predicate_terms(@_);
}
=head2 get_child_terms
Title : get_child_terms
Usage : get_child_terms(TermI term, TermI[] predicate_terms): TermI[]
Function: Retrieves all child terms of a given term, that satisfy a
relationship among those that are specified in the second
argument or undef otherwise. get_child_terms is a special
case of get_descendant_terms, limiting the search to the
direct descendants.
Note that a returned term may possibly be in another
ontology than this one, because the underlying engine may
manage multiple ontologies and the relationships of terms
between them. If you only want descendants within this
ontology, you need to filter the returned array.
Example :
Returns : Array of TermI objects.
Args : First argument is the term of interest, second is the list
of relationship type terms.
=cut
sub get_child_terms{
return shift->engine->get_child_terms(@_);
}
=head2 get_descendant_terms
Title : get_descendant_terms
Usage : get_descendant_terms(TermI term, TermI[] rel_types): TermI[]
Function: Retrieves all descendant terms of a given term, that
satisfy a relationship among those that are specified in
the second argument or undef otherwise.
Note that a returned term may possibly be in another
ontology than this one, because the underlying engine may
manage multiple ontologies and the relationships of terms
between them. If you only want descendants within this
ontology, you need to filter the returned array.
Example :
Returns : Array of TermI objects.
Args : First argument is the term of interest, second is the list
of relationship type terms.
=cut
sub get_descendant_terms{
return shift->engine->get_descendant_terms(@_);
}
=head2 get_parent_terms
Title : get_parent_terms
Usage : get_parent_terms(TermI term, TermI[] predicate_terms): TermI[]
Function: Retrieves all parent terms of a given term, that satisfy a
relationship among those that are specified in the second
argument or undef otherwise. get_parent_terms is a special
case of get_ancestor_terms, limiting the search to the
direct ancestors.
Note that a returned term may possibly be in another
ontology than this one, because the underlying engine may
manage multiple ontologies and the relationships of terms
between them. If you only want descendants within this
ontology, you need to filter the returned array.
Example :
Returns : Array of TermI objects.
Args : First argument is the term of interest, second is the list
of relationship type terms.
=cut
sub get_parent_terms{
return shift->engine->get_parent_terms(@_);
}
=head2 get_ancestor_terms
Title : get_ancestor_terms
Usage : get_ancestor_terms(TermI term, TermI[] predicate_terms): TermI[]
Function: Retrieves all ancestor terms of a given term, that satisfy
a relationship among those that are specified in the second
argument or undef otherwise.
Note that a returned term may possibly be in another
ontology than this one, because the underlying engine may
manage multiple ontologies and the relationships of terms
between them. If you only want descendants within this
ontology, you need to filter the returned array.
Example :
Returns : Array of TermI objects.
Args : First argument is the term of interest, second is the list
of relationship type terms.
=cut
sub get_ancestor_terms{
return shift->engine->get_ancestor_terms(@_);
}
=head2 get_leaf_terms
Title : get_leaf_terms
Usage : get_leaf_terms(): TermI[]
Function: Retrieves all leaf terms from the ontology. Leaf term is a
term w/o descendants.
Example : @leaf_terms = $obj->get_leaf_terms()
Returns : Array of TermI objects.
Args :
=cut
sub get_leaf_terms{
my $self = shift;
return grep { my $ont = $_->ontology;
# the first condition is a superset of the second, but
# we add it here for efficiency reasons, as many times
# it will short-cut to true and is supposedly faster than
# string comparison
($ont == $self) || ($ont->name eq $self->name);
} $self->engine->get_leaf_terms(@_);
}
=head2 get_root_terms()
Title : get_root_terms
Usage : get_root_terms(): TermI[]
Function: Retrieves all root terms from the ontology. Root term is a
term w/o descendants.
Example : @root_terms = $obj->get_root_terms()
Returns : Array of TermI objects.
Args :
=cut
sub get_root_terms{
my $self = shift;
return grep { my $ont = $_->ontology;
# the first condition is a superset of the second, but
# we add it here for efficiency reasons, as many times
# it will short-cut to true and is supposedly faster than
# string comparison
($ont == $self) || ($ont->name eq $self->name);
} $self->engine->get_root_terms(@_);
}
=head2 get_all_terms
Title : get_all_terms
Usage : get_all_terms: TermI[]
Function: Retrieves all terms from the ontology.
We do not mandate an order here in which the terms are
returned. In fact, the default implementation will return
them in unpredictable order.
Example : @terms = $obj->get_all_terms()
Returns : Array of TermI objects.
Args :
=cut
sub get_all_terms{
my $self = shift;
return grep { my $ont = $_->ontology;
# the first condition is a superset of the second, but
# we add it here for efficiency reasons, as many times
# it will short-cut to true and is supposedly faster than
# string comparison
($ont == $self) || ($ont->name eq $self->name);
} $self->engine->get_all_terms(@_);
}
=head2 find_terms
Title : find_terms
Usage : ($term) = $oe->find_terms(-identifier => "SO:0000263");
Function: Find term instances matching queries for their attributes.
An implementation may not support querying for arbitrary
attributes, but can generally be expected to accept
-identifier and -name as queries. If both are provided,
they are implicitly intersected.
Example :
Returns : an array of zero or more Bio::Ontology::TermI objects
Args : Named parameters. The following parameters should be recognized
by any implementations:
-identifier query by the given identifier
-name query by the given name
=cut
sub find_terms{
my $self = shift;
return grep { $_->ontology->name eq $self->name;
} $self->engine->find_terms(@_);
}
=head1 Factory for relationships and terms
=cut
=head2 relationship_factory
Title : relationship_factory
Usage : $fact = $obj->relationship_factory()
Function: Get (and set, if the engine supports it) the object
factory to be used when relationship objects are created by
the implementation on-the-fly.
Example :
Returns : value of relationship_factory (a Bio::Factory::ObjectFactoryI
compliant object)
Args :
=cut
sub relationship_factory{
return shift->engine->relationship_factory(@_);
}
=head2 term_factory
Title : term_factory
Usage : $fact = $obj->term_factory()
Function: Get (and set, if the engine supports it) the object
factory to be used when term objects are created by
the implementation on-the-fly.
Example :
Returns : value of term_factory (a Bio::Factory::ObjectFactoryI
compliant object)
Args :
=cut
sub term_factory{
return shift->engine->term_factory(@_);
}
#################################################################
# aliases
#################################################################
*get_relationship_types = \&get_predicate_terms;
1;
]]>