Class: RDF::Smart

Inherits:
Object
  • Object
show all
Defined in:
lib/rdf/smart.rb,
ext/rsm.c

Overview

Creates a RDF::Smart Object.

Constant Summary collapse

VERSION =

Equals the current version number

rb_str_new2(RSM_VERSION)

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Object

Creates a new RDF::Smart object.

Parameter args can be zero to n strings of filenames.

Parameter args will be saved as data_sources.



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# File 'ext/rsm.c', line 345

VALUE rsm_initialize(int argc, VALUE *argv, VALUE self) {
  int i;
  rsm_obj *prsm_obj;
  Data_Get_Struct(self, rsm_obj, prsm_obj);
  prsm_obj->data_sources = rb_ary_new();
  for (i=0; i<argc; i++) {
    if (TYPE(argv[i]) == T_STRING)  
      rb_ary_push(prsm_obj->data_sources,argv[i]);
  }

  return self;
}

Instance Method Details

#data_sources ⇒ Object

Returns an array, containing all data_sources



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# File 'ext/rsm.c', line 327

VALUE rsm_data_sources(VALUE self) {
  rsm_obj *prsm_obj;
  Data_Get_Struct(self, rsm_obj, prsm_obj);
  return(prsm_obj->data_sources);
}

#execute(query) ⇒ Object

Executes a query. query is a string.

An Error is raised if a data_source does not exist

A JSON Object will be returned.



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# File 'lib/rdf/smart.rb', line 18

def execute(query) #{{{
  data_sources.each do |s|
    raise 'BlaBlaBla' unless File.exists?(s)
  end
  ## 
  # +res+ is the returned value.
  if query.lstrip.downcase['prefix'] == nil 
    namespaces.each do |k,v|
      query =  "prefix #{k}: <#{v}> " +query
    end
  end
  (res = JSON::parse(__execute(query)))['results']['bindings'].each do |solution|
    solution.each do |k,v|
      catch :done do
      ##
      # Convert Strings into the right datatype.
      ##
      # Add +pvalue+ into returned Value. +pvalue+ contains the real value without namespaces. 
        case v['datatype']
          when 'http://www.w3.org/2001/XMLSchema#integer', 'http://www.w3.org/2001/XMLSchema#long', 'http://www.w3.org/2001/XMLSchema#int', 'http://www.w3.org/2001/XMLSchema#short', 'http://www.w3.org/2001/XMLSchema#long', 'http://www.w3.org/2001/XMLSchema#nonPositiveInteger', 'http://www.w3.org/2001/XMLSchema#negativeInteger', 'http://www.w3.org/2001/XMLSchema#nonNegativeInteger', 'http://www.w3.org/2001/XMLSchema#positiveInteger', 'http://www.w3.org/2001/XMLSchema#unsignedLong', 'http://www.w3.org/2001/XMLSchema#unsignedInt', 'http://www.w3.org/2001/XMLSchema#unsignedShort'
            v['ns'] = v['datatype']
            v['pvalue'] = v['value'].to_i
            throw :done
          when 'http://www.w3.org/2001/XMLSchema#float', 'http://www.w3.org/2001/XMLSchema#decimal', 'http://www.w3.org/2001/XMLSchema#double'
            v['ns'] = v['datatype']
            v['pvalue'] = v['value'].to_f
            throw :done
          when 'http://www.w3.org/2001/XMLSchema#boolean'
            v['ns'] = v['datatype']
            v['pvalue'] = v['value'] == 'true' ? true : false
            throw :done
          when 'http://www.w3.org/2001/XMLSchema#notation', 'http://www.w3.org/2001/XMLSchema#qname'
            v['ns'] = v['datatype']
            v['pvalue'] = v['value']
            throw :done
          when nil
          else
            v['ns'] = v['datatype']
            v['pvalue'] = v['value']
            throw :done
        end
        if v.length == 2 && v['value'] && v['type'] == 'literal'
          v['datatype'] = 'http://www.w3.org/2001/XMLSchema#string'
          v['ns'] = v['datatype']
          v['pvalue'] = v['value']
          throw :done
        end
        if v['value'] == 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type'
          v['ns'] = v['value']
          v['pvalue'] = 'a'
          throw :done
        end
        namespaces.each do |kk, vv|
          if v['value'].start_with?(vv)
            v['ns'] = vv
            v['pvalue'] = v['value'].sub(vv,'')
            throw :done
          end
        end
      end  
    end
  end
  res #}}}
end

#namespaces ⇒ Object

This method returns a hash containing all key value pairs of namespaces found in data_sources



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# File 'ext/rsm.c', line 185

VALUE rsm_namespaces(VALUE self) {
  rsm_obj *prsm_obj;
  int i;
  Data_Get_Struct(self, rsm_obj, prsm_obj);
  VALUE namespaces = rb_hash_new();

  for (i = 0; i < RARRAY_LEN(prsm_obj->data_sources); i++) {
    const char* data_source = RSTRING_PTR(RARRAY_PTR(prsm_obj->data_sources)[i]);
    rsm_get_namespaces(namespaces,(unsigned char *)data_source);
  } 

  return namespaces;
}

#version ⇒ Object

Returns the currently used version of rdf-smart.



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# File 'lib/rdf/smart.rb', line 85

def version
  VERSION
end