/usr/lib/ruby/2.2.0/rdf/redland/resource.rb is in librdf-ruby 1.0.17.1+dfsg-1.2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | require 'rdf/redland'
module Redland
#include Redland
class Resource < Node
# The internal librdf_node
attr_reader :node
# The internal model this Resource is connected to
attr_reader :model
# Create a Redland::Resource. Arg can be a String, or a Redland::Uri
#
def initialize(arg=nil,model=nil,new_node=true)
@context = nil
case arg
when nil
@node = Redland.librdf_new_node_from_blank_identifier($world.world,nil)
when String
@node = Redland.librdf_new_node_from_uri_string($world.world,arg)
when Uri
@node = Redland.librdf_new_node_from_uri($world.world,arg.uri)
when Node
@node = Redland.librdf_new_node_from_node(arg.node)
when SWIG::TYPE_p_librdf_node_s
@node = new_node ? Redland.librdf_new_node_from_node(arg): arg
end
raise RedlandError.new("Node construction failed") if not @node
ObjectSpace.define_finalizer(self,Node.create_finalizer(@node))
model ||= Model.new
@model = model
end
# Answer model.find(self,p,nil) in the associated model. If there are several
# such statements, any one of them may be returned
def get_property(p)
@model.object(self,p)
end
# Answer model.find(self,pred,nil) in the associated model
# If no predicate or block given, returns and array of
# statements matching model.find(self,nil,nil)
# If block_given? yields the predicate and the object
# resource.get_properties() do |p,o|
# puts "<td>#{p}</td><td>#{o}</td>"
# end
#
# If pred given, answers model.find(self,pred,nil)
# if no block return an array of the object values
# nicknames = resource.get_properties(FOAF::NICK)
#
# if block_given yields the objects which satisfy the predicate
# puts "Nicknames are"
# resource.get_properties(FOAF_NICK){|o| puts o}
def get_properties(pred=nil)
statements = @model.find(self,pred,nil)
if pred
if block_given?
statements.each{|st| yield st.object}
else
statements.map{|st| st.object}
end
else
return statements if not block_given?
statements.each{ |st| yield st.predicate,st.object}
end
end
# Finds all objects of a given predicate. Takes an optional block,
# yielding each statement if given.
def object_of_predicate(pred = nil)
# statements = @model.find(nil,pred,self)
if pred
if block_given?
@model.subjects(pred,self){|sub| yield sub}
else
return @model.subjects(pred,self)
end
else
statements = @model.find(nil,nil,self)
return statements if not block_given?
statements.each { |st| yield st.subject,st.predicate}
end
end
# Adds a statement to the model with the subject as the
# resource and p as the predicate and o as the object
# same as Model.add(this,p,o)
def add_property(p,o,context=nil)
@model.add(self,p,o,context)
return self
end
# Removes the property from the model with the predicate
# pred and optional context
def delete_property(pred,context=nil)
@model.delete(self,pred,self.get_property(pred),context)
return self
end
# Removes all of the properties from the model with this
# resource as the subject
def delete_properties()
self.get_properties().each{|st| @model.delete_statement(st)}
end
# Determine if this resource is of a given type
def type?(type)
self.model.find(self,TYPE,type).size != 0
end
# Change the value of the given property
def update_property(prop,value,context=nil)
self.delete_property(prop)
self.add_property(prop,value,context)
return self
end
# Sets the RDF type of this Resource where RDF type is
# <http://www.w3.org/1999/02/22-rdf-syntax-ns#TYPE>
def type=(type,context=@context)
self.delete_property(TYPE)
self.add_property(TYPE,type,context)
return self
end
# returns the RDF type of this Resource where RDF type is
# <http://www.w3.org/1999/02/22-rdf-syntax-ns#TYPE>
def type
self.get_property(TYPE)
end
# Set the type of this Resource
def set_type(type,context=@context)
self.delete_property(TYPE)
self.add_property(TYPE,type,context)
return self
end
# Defines a context for this resource
def set_context(context)
@context = context
end
end
end
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