Class: Ontopia::Topicmaps::Topicmap

Inherits:
Object
  • Object
show all
Defined in:
lib/ontopia/topicmaps/topicmap.rb

Defined Under Namespace

Classes: RowMapper

Constant Summary collapse

TOPICMAP_READER = 
{
  '.ctm'  => :CTMTopicMapReader,
  '.jtm'  => :JTMTopicMapReader,
  '.ltm'  => :LTMTopicMapReader,
  '.rdf'  => :RDFTopicMapReader,
  '.xfml' => :XFMLTopicMapReader,
  '.xtm'  => :XTMTopicMapReader
}
QUERY = 
{
  all_topics: "select $TOPIC from\n  topic($TOPIC),\n  item-identifier($TOPIC, $_)?\n  EOT\n  count_all_topics: <<-EOT\nselect count($TOPIC) from\n  topic($TOPIC),\n  item-identifier($TOPIC, $_)?\n  EOT\n}\n",
QUERY_PROJECTION_RE = 
%r{\bselect\s+(.+)\s+from\b}i

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ Topicmap

Returns a new instance of Topicmap.



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# File 'lib/ontopia/topicmaps/topicmap.rb', line 65

def initialize(file)
  Topicmaps.setup_classpath

  @file = file.include?(File::SEPARATOR) ? file :
    File.join(Topicmaps.base, 'topicmaps', file)

  @tm = read(@file)
end

Instance Attribute Details

#file ⇒ Object (readonly)

Returns the value of attribute file.



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# File 'lib/ontopia/topicmaps/topicmap.rb', line 74

def file
  @file
end

#tm ⇒ Object (readonly)

Returns the value of attribute tm.



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# File 'lib/ontopia/topicmaps/topicmap.rb', line 74

def tm
  @tm
end

Class Method Details

.extract_query_projection(query) ⇒ Object 



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# File 'lib/ontopia/topicmaps/topicmap.rb', line 58

def extract_query_projection(query)
  projection = query[QUERY_PROJECTION_RE, 1]
  projection.delete('$,').split if projection
end

Instance Method Details

#count(query = nil, declarations = nil) ⇒ Object 



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# File 'lib/ontopia/topicmaps/topicmap.rb', line 76

def count(query = nil, declarations = nil)
  query ||= :count_all_topics
  query_for_list(query, declarations) { |i,| i }.first || 0
end

#extract_query_projection(query) ⇒ Object 



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# File 'lib/ontopia/topicmaps/topicmap.rb', line 102

def extract_query_projection(query)
  self.class.extract_query_projection(query)
end

#extract_query_variables(query) ⇒ Object 



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# File 'lib/ontopia/topicmaps/topicmap.rb', line 106

def extract_query_variables(query)
  query_wrapper.get_query_processor.parse(query).get_selected_variables.to_a
end

#query(query = nil, declarations = nil, str = nil) ⇒ Object 



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# File 'lib/ontopia/topicmaps/topicmap.rb', line 81

def query(query = nil, declarations = nil, str = nil)
  str = Topicmaps.stringifier(str || :default)

  query_for_list(query, declarations, &block_given? ?
    lambda { |i, *| yield(i, str) } : lambda { |i, *| str[i] }).to_a
end

#query_maps(query = nil, declarations = nil) ⇒ Object 



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# File 'lib/ontopia/topicmaps/topicmap.rb', line 88

def query_maps(query = nil, declarations = nil)
  query_wrapper(declarations).query_for_maps(query_string(query)).to_a
end

#topics(value_str = nil, key_str = nil) ⇒ Object 



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# File 'lib/ontopia/topicmaps/topicmap.rb', line 92

def topics(value_str = nil, key_str = nil)
  hash, key_str = {}, Topicmaps.stringifier(key_str || :id)

  query(:all_topics, nil, value_str) { |i, str|
    hash[key_str[i]] = str[i]
  }

  hash
end