- AUTHOR - Hilmar Lapp
Bio::Ontology::OntologyStore - A repository of ontologies
#---------- #SCENARIO 1 #---------- #make an ontology object manually. via OntologyIO my $io = Bio::OntologyIO->new( #params to fetch Cell Ontology here ); my $cell_ontology = $io->next_ontology; #this is a singleton that caches the fact that you've created #a 'Cell Ontology' instance... my $store = Bio::Ontology::OntologyStore->get_instance(); #...and it can hand you back a copy of it at any time. my $cell_ontology_copy = $store->get_ontology('Cell Ontology'); #---------- #SCENARIO 2 #---------- my $store = Bio::Ontology::OntologyStore->get_instance(); #this use case allows the construction of an ontology on #demand just by supplying the name. my $ontology = $store->get_ontology('Sequence Ontology');
The primary purpose of this module is that of a singleton repository of Bio::Ontology::OntologyI instances from which an Ontology instance can be retrieved by name or identifier. This enables TermI implementations to return their corresponding OntologyI through using this singleton store instead of storing a direct reference to the Ontology object. The latter would almost inevitably lead to memory cycles, and would therefore potentially blow up an application.
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The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _
Title : new Usage : my $obj = Bio::Ontology::OntologyStore->new(); Function: Returns the Bio::Ontology::OntologyStore object. Unlike usual implementations of new, this implementation will try to return a previously instantiated store, if there is any. It is just a synonym for get_instance. In order to avoid ambiguities in your code, you may rather want to call rather get_instance explicitly, which also usually is better associated with this kind of behaviour. Returns : an instance of Bio::Ontology::OntologyStore Args :
Title : get_instance Usage : Function: Get an instance of this class for perusal. Since by design this class is meant to be used as a singleton, the implementation will return a previously instantianted store if there is one, and instantiate a new one otherwise. In order to use this class by means of an instance, call this method for added code clarity, not new(). Example : Returns : an instance of this class Args : named parameters, if any (currently, there are no class-specific parameters other than those accepted by Bio::Root::Root.
Title : get_ontology Usage : Function: Get a previously instantiated and registered instance of this class by name or by identifier. One of the main purposes of this class is to enable TermI implementations to return their respective ontology without keeping a strong reference to the respective ontology object. Only objects previously registered objects can be retrieved. This is a class method, hence you can call it on the class name, without dereferencing an object. Example : Returns : a Bio::Ontology::OntologyI implementing object, or undef if the query could not be satisfied Args : Named parameters specifying the query. The following parameters are recognized: -name query the store for an ontology with the given name -id query for an ontology with the given identifier If both are specified, an implicit AND logical operator is assumed.
Title : register_ontology Usage : Function: Registers the given Ontology object for later retrieval by name and identifier. Example : Returns : TRUE on success and FALSE otherwise Args : the Bio::Ontology::OntologyI object(s) to register
Title : remove_ontology Usage : Function: Remove the specified ontology from the store. Example : Returns : TRUE on success and FALSE otherwise Args : the Bio::Ontology::OntologyI implementing object(s) to be removed from the store
Usage : my $ontology = Bio::Ontology::OntologyStore->guess_ontology('GO:0000001'); Function: tries to guess which ontology a term identifier comes from, loads it as necessary, and returns it as a Bio::Ontology::Ontology object. Example : Returns : a Bio::Ontology::Ontology object, or warns and returns undef Args : an ontology term identifier in XXXX:DDDDDDD format. Guessing is based on the XXXX string before the colon.