Class: Pho::Update::Statement

Inherits:
Object
  • Object
show all
Defined in:
lib/pho/changeset.rb

Overview

Base class capturing data relating to a reified RDF triple described in a Changeset

Direct Known Subclasses

LiteralStatement, ResourceStatement

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#object ⇒ Object (readonly)

Object value. May be uri or literal



20
21
22
 
# File 'lib/pho/changeset.rb', line 20

def object
  @object
end

#predicate ⇒ Object (readonly)

URI of predicate



18
19
20
 
# File 'lib/pho/changeset.rb', line 18

def predicate
  @predicate
end

#subject ⇒ Object (readonly)

URI of subject



16
17
18
 
# File 'lib/pho/changeset.rb', line 16

def subject
  @subject
end

Class Method Details

.create_literal(subject, predicate, object, lang = nil, datatype = nil) ⇒ Object

Create a Statement referring to a literal. Can have one of lang or datatype but not both

subject

URI of subject of triple

predicate

URI of predicate of triple

object

literal value

lang

language for literal

datatype

datatype for literal



29
30
31
 
# File 'lib/pho/changeset.rb', line 29

def Statement.create_literal(subject, predicate, object, lang=nil, datatype=nil)
  return LiteralStatement.new(subject, predicate, object, lang, datatype)
end

.create_resource(subject, predicate, object) ⇒ Object

Create a Statement referring to a resource

subject

URI of subject of triple

predicate

URI of predicate of triple

object

resource uri



38
39
40
 
# File 'lib/pho/changeset.rb', line 38

def Statement.create_resource(subject, predicate, object)
    return ResourceStatement.new(subject, predicate, object)
end

Instance Method Details

#to_rdf ⇒ Object

Create an RDF/XML fragment describing this Statement



43
44
45
46
47
48
49
50
 
# File 'lib/pho/changeset.rb', line 43

def to_rdf()
  rdf = "<rdf:Statement>"
  rdf << write_subject()
  rdf << "  <rdf:predicate rdf:resource=\"#{@predicate}\"/>"
  rdf << write_object()
  rdf << "</rdf:Statement>"
  return rdf          
end