Module: RdfContext::TermUtils

Included in:
AbstractSQLStore
Defined in:
lib/rdf_context/term_utils.rb

Constant Summary collapse

TERM_INSTANTIATION_DICT = 
{
    'U' => URIRef,
    'B' => BNode,
    #'V' => Variable,
    'L' => Literal
}
GRAPH_TERM_DICT = 
{
    'F' => [QuotedGraph, URIRef],
    'U' => [Graph, URIRef],
    'B' => [Graph, BNode]
}
SUBJECT = 
0
PREDICATE = 
1
OBJECT = 
2
CONTEXT = 
3
TERM_COMBINATIONS = 
{
    'UUUU' => 0,
    'UUUB' => 1,
    'UUUF' => 2,
    'UUVU' => 3,
    'UUVB' => 4,
    'UUVF' => 5,
    'UUBU' => 6,
    'UUBB' => 7,
    'UUBF' => 8,
    'UULU' => 9,
    'UULB' => 10,
    'UULF' => 11,
    'UUFU' => 12,
    'UUFB' => 13,
    'UUFF' => 14,

    'UVUU' => 15,
    'UVUB' => 16,
    'UVUF' => 17,
    'UVVU' => 18,
    'UVVB' => 19,
    'UVVF' => 20,
    'UVBU' => 21,
    'UVBB' => 22,
    'UVBF' => 23,
    'UVLU' => 24,
    'UVLB' => 25,
    'UVLF' => 26,
    'UVFU' => 27,
    'UVFB' => 28,
    'UVFF' => 29,

    'VUUU' => 30,
    'VUUB' => 31,
    'VUUF' => 33,
    'VUVU' => 34,
    'VUVB' => 35,
    'VUVF' => 36,
    'VUBU' => 37,
    'VUBB' => 38,
    'VUBF' => 39,
    'VULU' => 40,
    'VULB' => 41,
    'VULF' => 42,
    'VUFU' => 43,
    'VUFB' => 44,
    'VUFF' => 45,

    'VVUU' => 46,
    'VVUB' => 47,
    'VVUF' => 48,
    'VVVU' => 49,
    'VVVB' => 50,
    'VVVF' => 51,
    'VVBU' => 52,
    'VVBB' => 53,
    'VVBF' => 54,
    'VVLU' => 55,
    'VVLB' => 56,
    'VVLF' => 57,
    'VVFU' => 58,
    'VVFB' => 59,
    'VVFF' => 60,

    'BUUU' => 61,
    'BUUB' => 62,
    'BUUF' => 63,
    'BUVU' => 64,
    'BUVB' => 65,
    'BUVF' => 66,
    'BUBU' => 67,
    'BUBB' => 68,
    'BUBF' => 69,
    'BULU' => 70,
    'BULB' => 71,
    'BULF' => 72,
    'BUFU' => 73,
    'BUFB' => 74,
    'BUFF' => 75,

    'BVUU' => 76,
    'BVUB' => 77,
    'BVUF' => 78,
    'BVVU' => 79,
    'BVVB' => 80,
    'BVVF' => 81,
    'BVBU' => 82,
    'BVBB' => 83,
    'BVBF' => 84,
    'BVLU' => 85,
    'BVLB' => 86,
    'BVLF' => 87,
    'BVFU' => 88,
    'BVFB' => 89,
    'BVFF' => 90,

    'FUUU' => 91,
    'FUUB' => 92,
    'FUUF' => 93,
    'FUVU' => 94,
    'FUVB' => 95,
    'FUVF' => 96,
    'FUBU' => 97,
    'FUBB' => 98,
    'FUBF' => 99,
    'FULU' => 100,
    'FULB' => 101,
    'FULF' => 102,
    'FUFU' => 103,
    'FUFB' => 104,
    'FUFF' => 105,

    'FVUU' => 106,
    'FVUB' => 107,
    'FVUF' => 108,
    'FVVU' => 109,
    'FVVB' => 110,
    'FVVF' => 111,
    'FVBU' => 112,
    'FVBB' => 113,
    'FVBF' => 114,
    'FVLU' => 115,
    'FVLB' => 116,
    'FVLF' => 117,
    'FVFU' => 118,
    'FVFB' => 119,
    'FVFF' => 120,

    # BNode predicates
    'UBUU' => 121,
    'UBUB' => 122,
    'UBUF' => 123,
    'UBVU' => 124,
    'UBVB' => 125,
    'UBVF' => 126,
    'UBBU' => 127,
    'UBBB' => 128,
    'UBBF' => 129,
    'UBLU' => 130,
    'UBLB' => 131,
    'UBLF' => 132,
    'UBFU' => 133,
    'UBFB' => 134,
    'UBFF' => 135,

    'VBUU' => 136,
    'VBUB' => 137,
    'VBUF' => 138,
    'VBVU' => 139,
    'VBVB' => 140,
    'VBVF' => 141,
    'VBBU' => 142,
    'VBBB' => 143,
    'VBBF' => 144,
    'VBLU' => 145,
    'VBLB' => 146,
    'VBLF' => 147,
    'VBFU' => 148,
    'VBFB' => 149,
    'VBFF' => 150,

    'BBUU' => 151,
    'BBUB' => 152,
    'BBUF' => 153,
    'BBVU' => 154,
    'BBVB' => 155,
    'BBVF' => 156,
    'BBBU' => 157,
    'BBBB' => 158,
    'BBBF' => 159,
    'BBLU' => 160,
    'BBLB' => 161,
    'BBLF' => 162,
    'BBFU' => 163,
    'BBFB' => 164,
    'BBFF' => 165,

    'FBUU' => 166,
    'FBUB' => 167,
    'FBUF' => 168,
    'FBVU' => 169,
    'FBVB' => 170,
    'FBVF' => 171,
    'FBBU' => 172,
    'FBBB' => 173,
    'FBBF' => 174,
    'FBLU' => 175,
    'FBLB' => 176,
    'FBLF' => 177,
    'FBFU' => 178,
    'FBFB' => 179,
    'FBFF' => 180,

}
REVERSE_TERM_COMBINATIONS = 
TERM_COMBINATIONS.invert

Instance Method Summary collapse

Instance Method Details

#constructGraph(term) ⇒ Object 



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# File 'lib/rdf_context/term_utils.rb', line 251

def constructGraph(term)
  GRAPH_TERM_DICT[term]
end

#normalizeGraph(graph) ⇒ Resource, String

Takes an instance of a Graph (Graph, QuotedGraph, ConjunctiveGraph) and returns the Graphs identifier and ‘type’ (‘U’ for Graphs, ‘F’ for QuotedGraphs ).

Parameters:

Returns:



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# File 'lib/rdf_context/term_utils.rb', line 223

def normalizeGraph(graph)
  t = case graph
  when QuotedGraph  then "F"
  when Graph        then term2Letter(graph.identifier)
  else                   term2Letter(graph)
  end
  identifier = graph.respond_to?(:identifier) ? graph.identifier : graph
  [identifier, t]
end

#statement2TermCombination(triple, context) ⇒ Object 



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# File 'lib/rdf_context/term_utils.rb', line 262

def statement2TermCombination(triple,context)
  key = "#{term2Letter(triple.subject)}#{term2Letter(triple.predicate)}#{term2Letter(triple.object)}#{normalizeGraph(context)[1]}"
  TERM_COMBINATIONS.fetch(key)
rescue IndexError
  raise RdfException.new("Unable to persist triple: #{triple.inspect}, context: #{context.inspect}, key: #{key}")
end

#term2Letter(term) ⇒ String

Return the type of a term (Resource)

Parameters:

Returns:

Raises:

  • RdfException



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# File 'lib/rdf_context/term_utils.rb', line 237

def term2Letter(term)
  case term
  when URIRef       then "U"
  when BNode        then "B"
  when Literal      then "L"
  when QuotedGraph  then "F"
  #when Variable     then "V"
  when Graph        then term2Letter(term.identifier)
  when nil          then "L"
  else
    raise RdfException.new("The given term (#{term}) is not an instance of any of the known types (URIRef, BNode, Literal, QuotedGraph, or Graph).  It is a #{term.class}")
  end
end

#type2TermCombination(member, klass, context) ⇒ Object 



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# File 'lib/rdf_context/term_utils.rb', line 255

def type2TermCombination(member,klass,context)
  key = "#{term2Letter(member)}U#{term2Letter(klass)}#{normalizeGraph(context)[1]}"
  TERM_COMBINATIONS.fetch(key)
rescue IndexError
   raise RdfException.new("Unable to persist classification triple: #{member.inspect}, rdf:type, #{klass.inspect}, context: #{context.inspect}, key: #{key}")
end