o i6@sHdZddlmZddlmZddlmZmZmZdgZ GdddZ dS)a" The :class:`~rdflib.resource.Resource` class wraps a :class:`~rdflib.graph.Graph` and a resource reference (i.e. a :class:`rdflib.term.URIRef` or :class:`rdflib.term.BNode`) to support a resource-oriented way of working with a graph. It contains methods directly corresponding to those methods of the Graph interface that relate to reading and writing data. The difference is that a Resource also binds a resource identifier, making it possible to work without tracking both the graph and a current subject. This makes for a "resource oriented" style, as compared to the triple orientation of the Graph API. Resulting generators are also wrapped so that any resource reference values (:class:`rdflib.term.URIRef` and :class:`rdflib.term.BNode`) are in turn wrapped as Resources. (Note that this behaviour differs from the corresponding methods in :class:`~rdflib.graph.Graph`, where no such conversion takes place.) Basic Usage Scenario -------------------- Start by importing things we need and define some namespaces:: >>> from rdflib import * >>> FOAF = Namespace("http://xmlns.com/foaf/0.1/") >>> CV = Namespace("http://purl.org/captsolo/resume-rdf/0.2/cv#") Load some RDF data:: >>> graph = Graph().parse(format='n3', data=''' ... @prefix rdfs: . ... @prefix xsd: . ... @prefix foaf: . ... @prefix cv: . ... ... @base . ... ... a foaf:Person; ... rdfs:comment "Just a Python & RDF hacker."@en; ... foaf:depiction ; ... foaf:homepage ; ... foaf:name "Some Body" . ... ... a foaf:Image; ... rdfs:label "some 1"@en; ... rdfs:comment "Just an image"@en; ... foaf:thumbnail . ... ... a foaf:Image . ... ... [] a cv:CV; ... cv:aboutPerson ; ... cv:hasWorkHistory [ cv:employedIn ; ... cv:startDate "2009-09-04"^^xsd:date ] . ... ''') Create a Resource:: >>> person = Resource( ... graph, URIRef("http://example.org/person/some1#self")) Retrieve some basic facts:: >>> person.identifier rdflib.term.URIRef(u'http://example.org/person/some1#self') >>> person.value(FOAF.name) rdflib.term.Literal(u'Some Body') >>> person.value(RDFS.comment) rdflib.term.Literal(u'Just a Python & RDF hacker.', lang=u'en') Resources can be sliced (like graphs, but the subject is fixed):: >>> for name in person[FOAF.name]: ... print(name) Some Body >>> person[FOAF.name : Literal("Some Body")] True Resources as unicode are represented by their identifiers as unicode:: >>> %(unicode)s(person) #doctest: +SKIP u'Resource(http://example.org/person/some1#self' Resource references are also Resources, so you can easily get e.g. a qname for the type of a resource, like:: >>> person.value(RDF.type).qname() u'foaf:Person' Or for the predicates of a resource:: >>> sorted( ... p.qname() for p in person.predicates() ... ) #doctest: +NORMALIZE_WHITESPACE +SKIP [u'foaf:depiction', u'foaf:homepage', u'foaf:name', u'rdf:type', u'rdfs:comment'] Follow relations and get more data from their Resources as well:: >>> for pic in person.objects(FOAF.depiction): ... print(pic.identifier) ... print(pic.value(RDF.type).qname()) ... print(pic.value(FOAF.thumbnail).identifier) http://example.org/images/person/some1.jpg foaf:Image http://example.org/images/person/some1-thumb.jpg >>> for cv in person.subjects(CV.aboutPerson): ... work = list(cv.objects(CV.hasWorkHistory))[0] ... print(work.value(CV.employedIn).identifier) ... print(work.value(CV.startDate)) http://example.org/#company 2009-09-04 It's just as easy to work with the predicates of a resource:: >>> for s, p in person.subject_predicates(): ... print(s.value(RDF.type).qname()) ... print(p.qname()) ... for s, o in p.subject_objects(): ... print(s.value(RDF.type).qname()) ... print(o.value(RDF.type).qname()) cv:CV cv:aboutPerson cv:CV foaf:Person This is useful for e.g. inspection:: >>> thumb_ref = URIRef("http://example.org/images/person/some1-thumb.jpg") >>> thumb = Resource(graph, thumb_ref) >>> for p, o in thumb.predicate_objects(): ... print(p.qname()) ... print(o.qname()) rdf:type foaf:Image Schema Example -------------- With this artificial schema data:: >>> graph = Graph().parse(format='n3', data=''' ... @prefix rdf: . ... @prefix rdfs: . ... @prefix owl: . ... @prefix v: . ... ... v:Artifact a owl:Class . ... ... v:Document a owl:Class; ... rdfs:subClassOf v:Artifact . ... ... v:Paper a owl:Class; ... rdfs:subClassOf v:Document . ... ... v:Choice owl:oneOf (v:One v:Other) . ... ... v:Stuff a rdf:Seq; rdf:_1 v:One; rdf:_2 v:Other . ... ... ''') From this class:: >>> artifact = Resource(graph, URIRef("http://example.org/def/v#Artifact")) we can get at subclasses:: >>> subclasses = list(artifact.transitive_subjects(RDFS.subClassOf)) >>> [c.qname() for c in subclasses] [u'v:Artifact', u'v:Document', u'v:Paper'] and superclasses from the last subclass:: >>> [c.qname() for c in subclasses[-1].transitive_objects(RDFS.subClassOf)] [u'v:Paper', u'v:Document', u'v:Artifact'] Get items from the Choice:: >>> choice = Resource(graph, URIRef("http://example.org/def/v#Choice")) >>> [it.qname() for it in choice.value(OWL.oneOf).items()] [u'v:One', u'v:Other'] On add, other resources are auto-unboxed: >>> paper = Resource(graph, URIRef("http://example.org/def/v#Paper")) >>> paper.add(RDFS.subClassOf, artifact) >>> artifact in paper.objects(RDFS.subClassOf) # checks Resource instance True >>> (paper._identifier, RDFS.subClassOf, artifact._identifier) in graph True Technical Details ----------------- Comparison is based on graph and identifier:: >>> g1 = Graph() >>> t1 = Resource(g1, URIRef("http://example.org/thing")) >>> t2 = Resource(g1, URIRef("http://example.org/thing")) >>> t3 = Resource(g1, URIRef("http://example.org/other")) >>> t4 = Resource(Graph(), URIRef("http://example.org/other")) >>> t1 is t2 False >>> t1 == t2 True >>> t1 != t2 False >>> t1 == t3 False >>> t1 != t3 True >>> t3 != t4 True >>> t3 < t1 and t1 > t3 True >>> t1 >= t1 and t1 >= t3 True >>> t1 <= t1 and t3 <= t1 True >>> t1 < t1 or t1 < t3 or t3 > t1 or t3 > t3 False Hash is computed from graph and identifier:: >>> g1 = Graph() >>> t1 = Resource(g1, URIRef("http://example.org/thing")) >>> hash(t1) == hash(Resource(g1, URIRef("http://example.org/thing"))) True >>> hash(t1) == hash(Resource(Graph(), t1.identifier)) False >>> hash(t1) == hash(Resource(Graph(), URIRef("http://example.org/thing"))) False The Resource class is suitable as a base class for mapper toolkits. For example, consider this utility for accessing RDF properties via qname-like attributes:: >>> class Item(Resource): ... ... def __getattr__(self, p): ... return list(self.objects(self._to_ref(*p.split('_', 1)))) ... ... def _to_ref(self, pfx, name): ... return URIRef(self._graph.store.namespace(pfx) + name) It works as follows:: >>> graph = Graph().parse(format='n3', data=''' ... @prefix rdfs: . ... @prefix foaf: . ... ... @base . ... ... foaf:name "Some Body"; ... foaf:depiction . ... rdfs:comment "Just an image"@en . ... ''') >>> person = Item(graph, URIRef("http://example.org/person/some1#self")) >>> print(person.foaf_name[0]) Some Body The mechanism for wrapping references as resources cooperates with subclasses. Therefore, accessing referenced resources automatically creates new ``Item`` objects:: >>> isinstance(person.foaf_depiction[0], Item) True >>> print(person.foaf_depiction[0].rdfs_comment[0]) Just an image )RDF)Path)BNodeNodeURIRefResourcec@sDeZdZddZeddZeddZddZd d Zd d Z d dZ ddZ ddZ ddZ ddZddZdIddZddZdIddZdId d!ZdId"d#Zd$d%Zd&d'Zd(d)Zejddd*fd+d,Zd-d.ZdId/d0ZdId1d2Zd3d4Zd5d6Zd7d8Zd9d:Z d;d<Z!d=d>Z"d?d@Z#dAdBZ$dCdDZ%dEdFZ&dGdHZ'dS)JrcCs||_||_dSN_graph _identifier)selfgraphsubjectrJ/var/www/edux/Edux_v2/venv/lib/python3.10/site-packages/rdflib/resource.py__init__)s zResource.__init__cC|jSr)r r rrrr -zResource.graphcCrrr rrrr identifier1rzResource.identifiercCsttt|jAt|jASr)hashrr r rrrr__hash__5szResource.__hash__cCs"t|to|j|jko|j|jkSr) isinstancerr r r otherrrr__eq__8s   zResource.__eq__cCs ||k Srrrrrr__ne__? zResource.__ne__cCst|tr |j|jkSdS)NF)rrr rrrr__lt__Bs  zResource.__lt__cCs||kp||k Srrrrrr__gt__HszResource.__gt__cCs||kp||kSrrrrrr__le__KzResource.__le__cCs ||k Srrrrrr__ge__NrzResource.__ge__cCs t|jSr)strr rrrr __unicode__QrzResource.__unicode__cC(t|tr|j}|j|j||fdSr)rrr r addr porrrr'T z Resource.addNcCr&r)rrr r remover(rrrr,Zr+zResource.removecCr&r)rrr r setr(rrrr-`r+z Resource.setcCs||j||jSr) _resourcesr subjectsr r predicaterrrr/fzResource.subjectscCs&t|tr|j}||j|j|Sr)rrr r.r predicates)r r*rrrr3is zResource.predicatescCs||j|j|Sr)r.r objectsr r0rrrr4or2zResource.objectscC||j|jSr)_resource_pairsr subject_predicatesr rrrrr7rzResource.subject_predicatescCr5r)r6r subject_objectsr rrrrr9ur8zResource.subject_objectscCr5r)r6r predicate_objectsr rrrrr:xr8zResource.predicate_objectsTc Cs,t|tr|j}||j|j||||Sr)rrr _castr value)r r)r*defaultanyrrrr<{s zResource.valuecCr5r)r.r itemsr rrrrr?r8zResource.itemscCs||j|j||Sr)r.r transitive_objectsr r r1rememberrrrr@zResource.transitive_objectscCs||j||j|Sr)r.r transitive_subjectsr rArrrrDrCzResource.transitive_subjectscCs|j|jSr)r qnamer rrrrrEszResource.qnameccs*|D]\}}||||fVqdSrr;)r pairss1s2rrrr6s zResource._resource_pairsccs4|D]\}}}||||||fVqdSrrF)r triplessr)r*rrr_resource_tripless zResource._resource_triplesccs|D]}||VqdSrrF)r nodesnoderrrr.szResource._resourcescCst|ttfr ||S|Sr)rrr_new)r rNrrrr;s zResource._castcCs||j|jddfSr)rLr rJrrrrr__iter__szResource.__iter__cCst|trJ|jr td|j|j}}t|tr|j}t|tr#|j}|dur/|dur/|S|dur8| |S|durA| |S|j ||f|j vSt|t tfrV| |Std|t|f)NzSResources fix the subject for slicing, and can only be sliced by predicate/object. z[You can only index a resource by a single rdflib term, a slice of rdflib terms, not %s (%s))rslicestep TypeErrorstartstoprr r:r3r4rr rrtype)r itemr)r*rrr __getitem__s0       zResource.__getitem__cCs|||dSr)r-)r rWr<rrr __setitem__r"zResource.__setitem__cCst||j|Sr)rVr )r rrrrrOr"z Resource._newcCs d|jS)Nz Resource(%s)rrrrr__str__rzResource.__str__cCsd|j|jfS)NzResource(%s,%s)r rrrr__repr__r"zResource.__repr__r)(__name__ __module__ __qualname__rpropertyr rrrrrr r!r#r%r'r,r-r/r3r4r7r9r:rr<r?r@rDrEr6rLr.r;rPrXrYrOrZr[rrrrr(sL         N) __doc__rdflib.namespacer rdflib.pathsr rdflib.termrrr__all__rrrrrs "