Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/rdflib/resource.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 # -*- coding: utf-8 -*-
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2 from __future__ import absolute_import
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3 from __future__ import division
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4 from __future__ import print_function
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5
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6 from six import text_type, PY3
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7
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8
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9 __doc__ = """
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10 The :class:`~rdflib.resource.Resource` class wraps a
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11 :class:`~rdflib.graph.Graph`
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12 and a resource reference (i.e. a :class:`rdflib.term.URIRef` or
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13 :class:`rdflib.term.BNode`) to support a resource-oriented way of
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14 working with a graph.
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15
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16 It contains methods directly corresponding to those methods of the Graph
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17 interface that relate to reading and writing data. The difference is that a
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18 Resource also binds a resource identifier, making it possible to work without
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19 tracking both the graph and a current subject. This makes for a "resource
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20 oriented" style, as compared to the triple orientation of the Graph API.
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21
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22 Resulting generators are also wrapped so that any resource reference values
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23 (:class:`rdflib.term.URIRef`s and :class:`rdflib.term.BNode`s) are in turn
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24 wrapped as Resources. (Note that this behaviour differs from the corresponding
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25 methods in :class:`~rdflib.graph.Graph`, where no such conversion takes place.)
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26
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27
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28 Basic Usage Scenario
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29 --------------------
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30
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31 Start by importing things we need and define some namespaces::
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32
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33 >>> from rdflib import *
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34 >>> FOAF = Namespace("http://xmlns.com/foaf/0.1/")
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35 >>> CV = Namespace("http://purl.org/captsolo/resume-rdf/0.2/cv#")
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36
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37 Load some RDF data::
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38
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39 >>> graph = Graph().parse(format='n3', data='''
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40 ... @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
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41 ... @prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
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42 ... @prefix foaf: <http://xmlns.com/foaf/0.1/> .
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43 ... @prefix cv: <http://purl.org/captsolo/resume-rdf/0.2/cv#> .
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44 ...
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45 ... @base <http://example.org/> .
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46 ...
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47 ... </person/some1#self> a foaf:Person;
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48 ... rdfs:comment "Just a Python & RDF hacker."@en;
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49 ... foaf:depiction </images/person/some1.jpg>;
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50 ... foaf:homepage <http://example.net/>;
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51 ... foaf:name "Some Body" .
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52 ...
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53 ... </images/person/some1.jpg> a foaf:Image;
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54 ... rdfs:label "some 1"@en;
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55 ... rdfs:comment "Just an image"@en;
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56 ... foaf:thumbnail </images/person/some1-thumb.jpg> .
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57 ...
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58 ... </images/person/some1-thumb.jpg> a foaf:Image .
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59 ...
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60 ... [] a cv:CV;
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61 ... cv:aboutPerson </person/some1#self>;
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62 ... cv:hasWorkHistory [ cv:employedIn </#company>;
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63 ... cv:startDate "2009-09-04"^^xsd:date ] .
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64 ... ''')
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65
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66 Create a Resource::
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67
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68 >>> person = Resource(
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69 ... graph, URIRef("http://example.org/person/some1#self"))
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70
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71 Retrieve some basic facts::
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72
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73 >>> person.identifier
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74 rdflib.term.URIRef(u'http://example.org/person/some1#self')
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75
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76 >>> person.value(FOAF.name)
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77 rdflib.term.Literal(u'Some Body')
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78
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79 >>> person.value(RDFS.comment)
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80 rdflib.term.Literal(u'Just a Python & RDF hacker.', lang=u'en')
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81
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82 Resources can be sliced (like graphs, but the subject is fixed)::
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83
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84 >>> for name in person[FOAF.name]:
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85 ... print(name)
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86 Some Body
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87 >>> person[FOAF.name : Literal("Some Body")]
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88 True
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89
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90 Resources as unicode are represented by their identifiers as unicode::
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91
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92 >>> %(unicode)s(person) #doctest: +SKIP
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93 u'Resource(http://example.org/person/some1#self'
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94
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95 Resource references are also Resources, so you can easily get e.g. a qname
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96 for the type of a resource, like::
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97
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98 >>> person.value(RDF.type).qname()
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99 u'foaf:Person'
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100
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101 Or for the predicates of a resource::
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102
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103 >>> sorted(
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104 ... p.qname() for p in person.predicates()
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105 ... ) #doctest: +NORMALIZE_WHITESPACE +SKIP
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106 [u'foaf:depiction', u'foaf:homepage',
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107 u'foaf:name', u'rdf:type', u'rdfs:comment']
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108
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109 Follow relations and get more data from their Resources as well::
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110
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111 >>> for pic in person.objects(FOAF.depiction):
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112 ... print(pic.identifier)
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113 ... print(pic.value(RDF.type).qname())
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114 ... print(pic.label())
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115 ... print(pic.comment())
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116 ... print(pic.value(FOAF.thumbnail).identifier)
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117 http://example.org/images/person/some1.jpg
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118 foaf:Image
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119 some 1
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120 Just an image
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121 http://example.org/images/person/some1-thumb.jpg
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122
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123 >>> for cv in person.subjects(CV.aboutPerson):
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124 ... work = list(cv.objects(CV.hasWorkHistory))[0]
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125 ... print(work.value(CV.employedIn).identifier)
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126 ... print(work.value(CV.startDate))
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127 http://example.org/#company
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128 2009-09-04
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129
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130 It's just as easy to work with the predicates of a resource::
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131
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132 >>> for s, p in person.subject_predicates():
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133 ... print(s.value(RDF.type).qname())
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134 ... print(p.qname())
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135 ... for s, o in p.subject_objects():
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136 ... print(s.value(RDF.type).qname())
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137 ... print(o.value(RDF.type).qname())
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138 cv:CV
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139 cv:aboutPerson
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140 cv:CV
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141 foaf:Person
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142
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143 This is useful for e.g. inspection::
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144
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145 >>> thumb_ref = URIRef("http://example.org/images/person/some1-thumb.jpg")
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146 >>> thumb = Resource(graph, thumb_ref)
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147 >>> for p, o in thumb.predicate_objects():
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148 ... print(p.qname())
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149 ... print(o.qname())
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150 rdf:type
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151 foaf:Image
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152
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153 Similarly, adding, setting and removing data is easy::
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154
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155 >>> thumb.add(RDFS.label, Literal("thumb"))
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156 >>> print(thumb.label())
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157 thumb
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158 >>> thumb.set(RDFS.label, Literal("thumbnail"))
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159 >>> print(thumb.label())
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160 thumbnail
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161 >>> thumb.remove(RDFS.label)
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162 >>> list(thumb.objects(RDFS.label))
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163 []
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164
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165
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166 Schema Example
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167 --------------
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168
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169 With this artificial schema data::
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170
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171 >>> graph = Graph().parse(format='n3', data='''
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172 ... @prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
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173 ... @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
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174 ... @prefix owl: <http://www.w3.org/2002/07/owl#> .
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175 ... @prefix v: <http://example.org/def/v#> .
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176 ...
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177 ... v:Artifact a owl:Class .
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178 ...
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179 ... v:Document a owl:Class;
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180 ... rdfs:subClassOf v:Artifact .
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181 ...
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182 ... v:Paper a owl:Class;
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183 ... rdfs:subClassOf v:Document .
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184 ...
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185 ... v:Choice owl:oneOf (v:One v:Other) .
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186 ...
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187 ... v:Stuff a rdf:Seq; rdf:_1 v:One; rdf:_2 v:Other .
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188 ...
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189 ... ''')
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190
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191 From this class::
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192
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193 >>> artifact = Resource(graph, URIRef("http://example.org/def/v#Artifact"))
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194
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195 we can get at subclasses::
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196
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197 >>> subclasses = list(artifact.transitive_subjects(RDFS.subClassOf))
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198 >>> [c.qname() for c in subclasses]
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199 [u'v:Artifact', u'v:Document', u'v:Paper']
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200
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201 and superclasses from the last subclass::
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202
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203 >>> [c.qname() for c in subclasses[-1].transitive_objects(RDFS.subClassOf)]
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204 [u'v:Paper', u'v:Document', u'v:Artifact']
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205
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206 Get items from the Choice::
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207
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208 >>> choice = Resource(graph, URIRef("http://example.org/def/v#Choice"))
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209 >>> [it.qname() for it in choice.value(OWL.oneOf).items()]
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210 [u'v:One', u'v:Other']
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211
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212 And the sequence of Stuff::
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213
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214 >>> stuff = Resource(graph, URIRef("http://example.org/def/v#Stuff"))
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215 >>> [it.qname() for it in stuff.seq()]
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216 [u'v:One', u'v:Other']
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217
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218 On add, other resources are auto-unboxed:
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219 >>> paper = Resource(graph, URIRef("http://example.org/def/v#Paper"))
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220 >>> paper.add(RDFS.subClassOf, artifact)
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221 >>> artifact in paper.objects(RDFS.subClassOf) # checks Resource instance
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222 True
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223 >>> (paper._identifier, RDFS.subClassOf, artifact._identifier) in graph
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224 True
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225
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226
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227 Technical Details
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228 -----------------
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229
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230 Comparison is based on graph and identifier::
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231
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232 >>> g1 = Graph()
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233 >>> t1 = Resource(g1, URIRef("http://example.org/thing"))
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234 >>> t2 = Resource(g1, URIRef("http://example.org/thing"))
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235 >>> t3 = Resource(g1, URIRef("http://example.org/other"))
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236 >>> t4 = Resource(Graph(), URIRef("http://example.org/other"))
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237
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238 >>> t1 is t2
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239 False
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240
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241 >>> t1 == t2
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242 True
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243 >>> t1 != t2
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244 False
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245
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246 >>> t1 == t3
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247 False
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248 >>> t1 != t3
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249 True
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250
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251 >>> t3 != t4
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252 True
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253
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254 >>> t3 < t1 and t1 > t3
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255 True
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256 >>> t1 >= t1 and t1 >= t3
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257 True
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258 >>> t1 <= t1 and t3 <= t1
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259 True
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260
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261 >>> t1 < t1 or t1 < t3 or t3 > t1 or t3 > t3
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262 False
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263
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264 Hash is computed from graph and identifier::
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265
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266 >>> g1 = Graph()
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267 >>> t1 = Resource(g1, URIRef("http://example.org/thing"))
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268
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269 >>> hash(t1) == hash(Resource(g1, URIRef("http://example.org/thing")))
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270 True
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271
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272 >>> hash(t1) == hash(Resource(Graph(), t1.identifier))
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273 False
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274 >>> hash(t1) == hash(Resource(Graph(), URIRef("http://example.org/thing")))
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275 False
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276
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277 The Resource class is suitable as a base class for mapper toolkits. For
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278 example, consider this utility for accessing RDF properties via qname-like
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279 attributes::
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280
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281 >>> class Item(Resource):
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282 ...
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283 ... def __getattr__(self, p):
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284 ... return list(self.objects(self._to_ref(*p.split('_', 1))))
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285 ...
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286 ... def _to_ref(self, pfx, name):
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287 ... return URIRef(self._graph.store.namespace(pfx) + name)
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288
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289 It works as follows::
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290
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291 >>> graph = Graph().parse(format='n3', data='''
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292 ... @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
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293 ... @prefix foaf: <http://xmlns.com/foaf/0.1/> .
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294 ...
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295 ... @base <http://example.org/> .
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296 ... </person/some1#self>
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297 ... foaf:name "Some Body";
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298 ... foaf:depiction </images/person/some1.jpg> .
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299 ... </images/person/some1.jpg> rdfs:comment "Just an image"@en .
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300 ... ''')
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301
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302 >>> person = Item(graph, URIRef("http://example.org/person/some1#self"))
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303
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304 >>> print(person.foaf_name[0])
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305 Some Body
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306
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307 The mechanism for wrapping references as resources cooperates with subclasses.
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308 Therefore, accessing referenced resources automatically creates new ``Item``
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309 objects::
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310
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311 >>> isinstance(person.foaf_depiction[0], Item)
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312 True
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313
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314 >>> print(person.foaf_depiction[0].rdfs_comment[0])
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315 Just an image
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316
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317 """
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318
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319 from rdflib.term import Node, BNode, URIRef
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320 from rdflib.namespace import RDF
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321 from rdflib.paths import Path
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322
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323 __all__ = ['Resource']
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324
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325
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326 class Resource(object):
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327
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328 def __init__(self, graph, subject):
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329 self._graph = graph
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330 self._identifier = subject
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331
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332 graph = property(lambda self: self._graph)
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333
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334 identifier = property(lambda self: self._identifier)
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335
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336 def __hash__(self):
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337 return hash(Resource) ^ hash(self._graph) ^ hash(self._identifier)
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338
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339 def __eq__(self, other):
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340 return (isinstance(other, Resource) and
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341 self._graph == other._graph and
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342 self._identifier == other._identifier)
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343
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344 def __ne__(self, other): return not self == other
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345
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346 def __lt__(self, other):
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347 if isinstance(other, Resource):
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348 return self._identifier < other._identifier
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349 else:
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350 return False
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351
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352 def __gt__(self, other): return not (self < other or self == other)
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353
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354 def __le__(self, other): return self < other or self == other
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355
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356 def __ge__(self, other): return not self < other
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357
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358 def __unicode__(self):
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359 return text_type(self._identifier)
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360
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361 if PY3:
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362 __str__ = __unicode__
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363
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364 def add(self, p, o):
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365 if isinstance(o, Resource):
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366 o = o._identifier
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367
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368 self._graph.add((self._identifier, p, o))
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369
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370 def remove(self, p, o=None):
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371 if isinstance(o, Resource):
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372 o = o._identifier
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373
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374 self._graph.remove((self._identifier, p, o))
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375
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376 def set(self, p, o):
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377 if isinstance(o, Resource):
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378 o = o._identifier
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379
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380 self._graph.set((self._identifier, p, o))
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381
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382 def subjects(self, predicate=None): # rev
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383 return self._resources(
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384 self._graph.subjects(predicate, self._identifier))
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385
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386 def predicates(self, o=None):
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387 if isinstance(o, Resource):
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388 o = o._identifier
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389
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390 return self._resources(
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391 self._graph.predicates(self._identifier, o))
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392
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393 def objects(self, predicate=None):
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394 return self._resources(
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395 self._graph.objects(self._identifier, predicate))
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396
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397 def subject_predicates(self):
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398 return self._resource_pairs(
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399 self._graph.subject_predicates(self._identifier))
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400
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401 def subject_objects(self):
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402 return self._resource_pairs(
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403 self._graph.subject_objects(self._identifier))
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404
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405 def predicate_objects(self):
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406 return self._resource_pairs(
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407 self._graph.predicate_objects(self._identifier))
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408
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409 def value(self, p=RDF.value, o=None, default=None, any=True):
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410 if isinstance(o, Resource):
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411 o = o._identifier
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412
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413 return self._cast(
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414 self._graph.value(self._identifier, p, o, default, any))
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415
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416 def label(self):
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417 return self._graph.label(self._identifier)
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418
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419 def comment(self):
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420 return self._graph.comment(self._identifier)
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421
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422 def items(self):
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423 return self._resources(self._graph.items(self._identifier))
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424
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425 def transitive_objects(self, predicate, remember=None):
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426 return self._resources(self._graph.transitive_objects(
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427 self._identifier, predicate, remember))
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428
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429 def transitive_subjects(self, predicate, remember=None):
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430 return self._resources(self._graph.transitive_subjects(
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431 predicate, self._identifier, remember))
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432
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433 def seq(self):
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434 return self._resources(self._graph.seq(self._identifier))
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435
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436 def qname(self):
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437 return self._graph.qname(self._identifier)
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438
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439 def _resource_pairs(self, pairs):
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440 for s1, s2 in pairs:
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441 yield self._cast(s1), self._cast(s2)
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442
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443 def _resource_triples(self, triples):
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444 for s, p, o in triples:
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445 yield self._cast(s), self._cast(p), self._cast(o)
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446
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447 def _resources(self, nodes):
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448 for node in nodes:
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449 yield self._cast(node)
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450
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451 def _cast(self, node):
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452 if isinstance(node, (BNode, URIRef)):
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453 return self._new(node)
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454 else:
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455 return node
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456
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457 def __iter__(self):
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458 return self._resource_triples(self._graph.triples((self.identifier, None, None)))
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459
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460 def __getitem__(self, item):
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461 if isinstance(item, slice):
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462 if item.step:
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463 raise TypeError("Resources fix the subject for slicing, and can only be sliced by predicate/object. ")
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464 p, o = item.start, item.stop
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parents:
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465 if isinstance(p, Resource):
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466 p = p._identifier
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467 if isinstance(o, Resource):
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468 o = o._identifier
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469 if p is None and o is None:
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parents:
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470 return self.predicate_objects()
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parents:
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471 elif p is None:
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472 return self.predicates(o)
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parents:
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473 elif o is None:
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474 return self.objects(p)
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475 else:
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476 return (self.identifier, p, o) in self._graph
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477 elif isinstance(item, (Node, Path)):
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478 return self.objects(item)
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479 else:
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parents:
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480 raise TypeError("You can only index a resource by a single rdflib term, a slice of rdflib terms, not %s (%s)"%(item, type(item)))
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481
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482 def __setitem__(self, item, value):
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483 self.set(item, value)
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484
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485 def _new(self, subject):
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486 return type(self)(self._graph, subject)
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487
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488 def __str__(self):
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489 return 'Resource(%s)' % self._identifier
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490
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491 def __repr__(self):
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492 return 'Resource(%s,%s)' % (self._graph, self._identifier)