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Diffstat (limited to 'creactistore/_templates/lib/rdflib/resource.py')
| -rw-r--r-- | creactistore/_templates/lib/rdflib/resource.py | 406 |
1 files changed, 0 insertions, 406 deletions
diff --git a/creactistore/_templates/lib/rdflib/resource.py b/creactistore/_templates/lib/rdflib/resource.py deleted file mode 100644 index 23acf8e..0000000 --- a/creactistore/_templates/lib/rdflib/resource.py +++ /dev/null @@ -1,406 +0,0 @@ -# -*- coding: utf-8 -*- -from rdflib import py3compat -__doc__ = py3compat.format_doctest_out(""" -The ``Resource`` class wraps a ``Graph`` and a resource reference (i.e. an -``URIRef`` or ``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 -(``URIRef``s and ``BNode``s) are in turn wrapped as Resources. (Note that this -behaviour differs from the corresponding methods in Graph, were 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: <http://www.w3.org/2000/01/rdf-schema#> . - ... @prefix xsd: <http://www.w3.org/2001/XMLSchema#>. - ... @prefix foaf: <http://xmlns.com/foaf/0.1/> . - ... @prefix cv: <http://purl.org/captsolo/resume-rdf/0.2/cv#> . - ... - ... @base <http://example.org/> . - ... - ... </person/some1#self> a foaf:Person; - ... rdfs:comment "Just a Python & RDF hacker."@en; - ... foaf:depiction </images/person/some1.jpg>; - ... foaf:homepage <http://example.net/>; - ... foaf:name "Some Body" . - ... - ... </images/person/some1.jpg> a foaf:Image; - ... rdfs:label "some 1"@en; - ... rdfs:comment "Just an image"@en; - ... foaf:thumbnail </images/person/some1-thumb.jpg> . - ... - ... </images/person/some1-thumb.jpg> a foaf:Image . - ... - ... [] a cv:CV; - ... cv:aboutPerson </person/some1#self>; - ... cv:hasWorkHistory [ cv:employedIn </#company>; - ... 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('http://example.org/person/some1#self') - - >>> person.value(FOAF.name) - rdflib.term.Literal(%(u)s'Some Body') - - >>> person.value(RDFS.comment) - rdflib.term.Literal(%(u)s'Just a Python & RDF hacker.', lang=%(u)s'en') - -Resources as unicode are represented by their identifiers as unicode:: - - >>> unicode(person) - %(u)s'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)s'foaf:Person' - -Or for the predicates of a resource:: - - >>> sorted(p.qname() for p in person.predicates()) - [%(u)s'foaf:depiction', %(u)s'foaf:homepage', %(u)s'foaf:name', %(u)s'rdf:type', %(u)s'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.label()) - ... print(pic.comment()) - ... print(pic.value(FOAF.thumbnail).identifier) - http://example.org/images/person/some1.jpg - foaf:Image - some 1 - Just an 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 - -Similarly, adding, setting and removing data is easy:: - - >>> thumb.add(RDFS.label, Literal("thumb")) - >>> print(thumb.label()) - thumb - >>> thumb.set(RDFS.label, Literal("thumbnail")) - >>> print(thumb.label()) - thumbnail - >>> thumb.remove(RDFS.label) - >>> list(thumb.objects(RDFS.label)) - [] - - -Schema Example --------------- - -With this artificial schema data:: - - >>> graph = Graph().parse(format='n3', data=''' - ... @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . - ... @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . - ... @prefix owl: <http://www.w3.org/2002/07/owl#> . - ... @prefix v: <http://example.org/def/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)s'v:Artifact', %(u)s'v:Document', %(u)s'v:Paper'] - -and superclasses from the last subclass:: - - >>> [c.qname() for c in subclasses[-1].transitive_objects(RDFS.subClassOf)] - [%(u)s'v:Paper', %(u)s'v:Document', %(u)s'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)s'v:One', %(u)s'v:Other'] - -And the sequence of Stuff:: - - >>> stuff = Resource(graph, URIRef("http://example.org/def/v#Stuff")) - >>> [it.qname() for it in stuff.seq()] - [%(u)s'v:One', %(u)s'v:Other'] - - -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: <http://www.w3.org/2000/01/rdf-schema#> . - ... @prefix foaf: <http://xmlns.com/foaf/0.1/> . - ... - ... @base <http://example.org/> . - ... </person/some1#self> - ... foaf:name "Some Body"; - ... foaf:depiction </images/person/some1.jpg> . - ... </images/person/some1.jpg> 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 - -""") - -from rdflib.term import BNode, URIRef -from rdflib.namespace import RDF - -__all__ = ['Resource'] - -class Resource(object): - - def __init__(self, graph, subject): - self._graph = graph - self._identifier = subject - - graph = property(lambda self: self._graph) - - identifier = property(lambda self: self._identifier) - - def __hash__(self): - return hash(Resource) ^ hash(self._graph) ^ hash(self._identifier) - - def __eq__(self, other): - return (isinstance(other, Resource) and - self._graph == other._graph and - self._identifier == other._identifier) - - __ne__ = lambda self, other: not self == other - - def __lt__(self, other): - if isinstance(other, Resource): - return self._identifier < other._identifier - else: - return False - - __gt__ = lambda self, other: not (self < other or self == other) - __le__ = lambda self, other: self < other or self == other - __ge__ = lambda self, other: not self < other - - def __unicode__(self): - return unicode(self._identifier) - - if py3compat.PY3: - __str__ = __unicode__ - - def add(self, p, o): - self._graph.add((self._identifier, p, o)) - - def remove(self, p, o=None): - self._graph.remove((self._identifier, p, o)) - - def set(self, predicate, object): - self._graph.set((self._identifier, predicate, object)) - - def subjects(self, predicate=None): # rev - return self._resources(self._graph.subjects(predicate, self._identifier)) - - def predicates(self, object=None): - return self._resources(self._graph.predicates(self._identifier, object)) - - def objects(self, predicate=None): - return self._resources(self._graph.objects(self._identifier, predicate)) - - def subject_predicates(self): - return self._resource_pairs( - self._graph.subject_predicates(self._identifier)) - - def subject_objects(self): - return self._resource_pairs( - self._graph.subject_objects(self._identifier)) - - def predicate_objects(self): - return self._resource_pairs( - self._graph.predicate_objects(self._identifier)) - - def value(self, predicate=RDF.value, object=None, default=None, any=True): - return self._cast( - self._graph.value(self._identifier, predicate, object, default, any)) - - def label(self): - return self._graph.label(self._identifier) - - def comment(self): - return self._graph.comment(self._identifier) - - def items(self): - return self._resources(self._graph.items(self._identifier)) - - def transitive_objects(self, predicate, remember=None): - return self._resources(self._graph.transitive_objects( - self._identifier, predicate, remember)) - - def transitive_subjects(self, predicate, remember=None): - return self._resources(self._graph.transitive_subjects( - predicate, self._identifier, remember)) - - def seq(self): - return self._resources(self._graph.seq(self._identifier)) - - def qname(self): - return self._graph.qname(self._identifier) - - def _resource_pairs(self, pairs): - for s1, s2 in pairs: - yield self._cast(s1), self._cast(s2) - - def _resources(self, nodes): - for node in nodes: - yield self._cast(node) - - def _cast(self, node): - if isinstance(node, (BNode, URIRef)): - return self._new(node) - else: - return node - - def _new(self, subject): - return type(self)(self._graph, subject) - - |