Class: Tripleizer

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(output = nil) ⇒ Tripleizer

build new instance define you can define output param



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# File 'lib/tripleizer.rb', line 16

def initialize output=nil
  @object_properties = configatron.objectProperties.to_hash
  @object_namespaces = configatron.namespaces.to_hash
  @class_map = configatron.classMap.to_hash
  @output=output
  @version="0.0.2"
  @json_hash = Hash.new
  @output_json = nil;
  @base_uri = "http://example.com/"
end

Instance Attribute Details

#base_uri ⇒ Object

base uri..if not set, std. from config is used



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# File 'lib/tripleizer.rb', line 34

def base_uri
  @base_uri
end

#output ⇒ Object

stores RDF output as string



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# File 'lib/tripleizer.rb', line 28

def output
  @output
end

#output_json ⇒ Object

the RDF data as a json object



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# File 'lib/tripleizer.rb', line 32

def output_json
  @output_json
end

#version ⇒ Object (readonly)

rtriplify-version showed in RDF



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# File 'lib/tripleizer.rb', line 30

def version
  @version
end

Instance Method Details

#add_json_pair(subject, predicate, oa) ⇒ Object

adds a pair to the json hash tree



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# File 'lib/tripleizer.rb', line 542

def add_json_pair subject, predicate,oa
  if @json_hash.key? subject
    if @json_hash[subject].key? predicate
      @json_hash[subject][predicate].merge!(oa)
    else
      @json_hash[subject][predicate]=oa
    end
  else
    @json_hash[subject]=Hash.new
    @json_hash[subject][predicate]=oa
    hello="test"
  end
end

#dbd_types(model, model_attributes) ⇒ Object

returns an hash with columnname as key and datatype as value



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# File 'lib/tripleizer.rb', line 517

def dbd_types (model,model_attributes)
  #hard coded mapping look mapping table
  mapping = Hash[ "binary"=>"base64Binary","boolean"=>"boolean","date"=>"date","datetime"=>"dateTime","decimal"=>"decimal","float"=>"float","integer"=>"integer","string"=>"string","text"=>"string","time"=>"time","timestamp"=>"dateTime",]
  dtypes = Hash.new
  model.columns_hash.each_key do |m|
    #make xsd datatye
    dtypes[m.to_s] ="xsd:#{mapping[model.columns_hash[m].type.to_s] }"
  end
  #replace mapping
  model_attributes.each do |k,v|
    dtypes[k.to_s]=dtypes[v.to_s]
  end
  dtypes
end

#extract_id_line(model_attributes, line, item, dtypes) ⇒ Object

search for the ID field and set it in line var- to the “id”-key



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# File 'lib/tripleizer.rb', line 346

def extract_id_line model_attributes, line,item,dtypes
  #look if id is mapped to another field
  id_keys = model_attributes.to_hash.keys
  #hotfix..bad performance
  id_keys.map!{|k| k.to_s }
  id_key= id_keys.select{|k| k =~/^(ID|id|iD|Id)$/ }
  if id_key.empty?
    line[:id] = item.id
  else
    line[:id] = eval("item.#{model_attributes[id_key[0].to_sym]}")
    #set the correct datatype for it
    dtypes["id"]= dtypes[id_key[0]]
    #remove the id line
    line.delete id_key[0]
  end
end

#find_models(key, rdfa = nil) ⇒ Object

Find all the models to the given key ( the RDF-Class name) returns a hash with the RDF-Class name as key and the models as value rdfa -> if true, watch for a RDFa section



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# File 'lib/tripleizer.rb', line 264

def find_models key, rdfa=nil
  if rdfa
    model_groups =  eval("configatron.rdfa_query") ?  eval("configatron.rdfa_query").to_hash : eval("configatron.query").to_hash    
  else
    model_groups =  eval("configatron.query").to_hash
  end  
  model_groups.each do |model_group_name,model_group|
    if model_group_name.to_s.downcase == key.downcase
      return {model_group_name=>model_group}
    end
  end
  nil
end

#find_rdfa_by_id(rdf_start_class, id) ⇒ Object

generate RDFa tags by a specified ID



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# File 'lib/tripleizer.rb', line 173

def find_rdfa_by_id rdf_start_class , id
  #map each var on its classname
  id = id.to_s
  rdfa_string = "<div  about=\"#{rdf_start_class+"/"<<id}\" typeof=\"#{@class_map[rdf_start_class.to_sym]}\">\n"
  #get configuration start ->classes
  m = find_models(rdf_start_class,true)
  if m
    m.values[0].each do |mod,attributes|
      unless mod.to_s.eql?("sql_query")
        t_mod = Model.new(mod, rdf_start_class)
        #if sql...
        item=t_mod.get_row_by_id(id).first
        t_mod.model_attributes.each do |name,link_field|
          #property
          #link to other ress
          if name.to_s.include? "->"
            m_class,role_mod = name.to_s.split "->"

            if role_mod.eql?("sql_query")
              hello=""
            else
              if link_field.include?("*")
                field_class,field= link_field.to_s.split("*")
                if field_class.to_s[0..5]=="MODEL("
                  field_class.gsub!("MODEL(","Model.new(")
                  submodel= eval(field_class.to_s).get_rows
                  rdfa_string<<"<div rel=\"#{m_class}\">\n"
                  submodel.each do |line|
                    rdfa_string<<find_rdfa_by_id(role_mod , eval("line.#{field.to_s}"))
                  end
                  rdfa_string<<"</div>\n"
                else
                  subitem =  eval("item.#{field_class}")
                  rdfa_string<<"<div rel=\"#{m_class}\">\n"
                  subitem.each do |subline|
                    rdfa_string<<  find_rdfa_by_id(role_mod , eval("subline.#{field.to_s}"))
                  end
                  rdfa_string<<"</div>\n"
                end
              else
                rdfa_string<<"<div rel=\"#{m_class}\">\n"
                rdfa_string << find_rdfa_by_id(role_mod , eval("item.#{link_field.to_s}"))
                rdfa_string<<"</div>\n"
              end
            end
          else
            write=true
            #just a property
            #CONST(
            #Model(
            if link_field.to_s[0..5] =="CONST("
              write=false
              val,data_type= t_mod.get_const(link_field)
              if data_type=="LINK"
                #link
                rdfa_string<<"<div rel= \"#{name}\" resource=\"#{val}\"> </div>\n"
              else
                #value
                rdfa_string<<"<div property= \"#{name}\"  content=\"#{val}\" datatype=\"#{data_type}\"> </div>\n"
              end
            else
              m_class,field= link_field.to_s.split("*")
              if  name.to_s[0..5]=="MODEL("
                m_class.gsub!("MODEL(","Model.new(")
                submodel= eval(m_class.to_s).get_rows
                submodel.each do |line|
                  datatype="string"
                  rdfa_string<<"<div property= \"#{ref_pred}\"  content=\"#{eval("line.#{field.to_s.downcase}")}\" datatype=\"#{data_type}\"> </div>\n"
                end
              end
              if field
                write = false
                #rdfa_string<<find_rdfa_by_id("","")
              end
            end
            rdfa_string<<"<div property= \"#{name}\"  content=\"#{eval("item.#{link_field}")}\"></div>\n" if write
          end
        end
      end
    end
  end
  rdfa_string << "</div>\n"
end

#generate_base_uri(request, set = nil) ⇒ Object

extract the base uri for triple generation from given request if param “set” is true, the inner base_uri variable off class will be set too



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# File 'lib/tripleizer.rb', line 510

def generate_base_uri request, set=nil
  b_uri= uri request.env['REQUEST_URI'].to_s[0..-request.env['PATH_INFO'].length]
  @base_uri = b_uri if set
  b_uri
end

#json ⇒ Object

if output var is set to jason, you get the json source here



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# File 'lib/tripleizer.rb', line 537

def json
  @json_hash.to_json
end

#make_triples(c1, rdf_class, maketype, dtypes = Array.new, rdf_type = true) ⇒ Object

generate the triples from a given hash



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# File 'lib/tripleizer.rb', line 384

def make_triples (c1,rdf_class,maketype,dtypes=Array.new,rdf_type=true)
  rdf_ns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  ipref= uri rdf_class.to_s+'/'
  is_literal=false
  dtype,lang,ret="","",""
  object_property = nil
  triples =""

  unless c1[:id]
    id_row = c1.select {|k,v| k =~ /^(id|ID|iD|Id)$/}
    c1[:id] = id_row[0][1]
    c1.delete id_row[0][0]

    #set datatype for id
    #dtypes[:id] = uri( (id_row[0][1]).type)
  end

  subject = uri c1[:id].to_s,ipref
  #write model :-)

  c= @class_map[rdf_class.to_sym] ?@class_map[rdf_class.to_sym]:rdf_class
  triples << write_triple(subject, rdf_ns+"type", uri(c, @object_namespaces[:vocabulary]))  if rdf_type
  # write_triple(subject,predi    cate,object                                                  ,is_literal=false,dtype="",lang="",json=nil)
  c1.delete :id unless rdf_type

  c1.each do |k,v|
    #FIXME: not quite satisfied with this source part
    dtype=""
    k=k.to_s
    if v.to_s.empty?
      next
    end

    # beinhaltet key ^^ dann type oder sprache richtig setzen
    if k.index("^^")
      #TODO: k,dtype = k.split("^^")
      dtype= uri k.split("^^")[1]
      k= k.split("^^")[0]
    else if dtypes.include? k
        dtype= uri dtypes[k]
      else if k.index("@")
          lang=k.split("@")[1]
          k = k.split("@")[0]
        end
      end
    end
    # 
    if k.index("->")
      k, object_property = k.split("->")
    else
      object_property = @object_properties[k]
    end

    #TODO
    #callbackfunktion
    #

    prop= self.uri(k,@object_namespaces[:vocabulary])
    unless object_property
      is_literal= true
      object= v.to_s
    else
      is_literal= false      
      #TODO: fixme "/" in the middle      
      object= uri  "#{object_property}#{object_property[-1,1].to_s !="/" ? "/":":"}#{v}"
      if object[0..1] == "t/"
        object = object.to_s[2..-1]
      end
    end
    triples<<write_triple(subject,prop,object,is_literal,dtype,lang).to_s
  end
  triples
end

#normalize_local_name(name) ⇒ Object

some encoding stuff



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# File 'lib/tripleizer.rb', line 532

def normalize_local_name name
  CGI::escape(name).gsub(/%2F/,'/').gsub(/%23/,'#') 
end

#rdf(rdf_start_class, var = []) ⇒ Object

Generation of N3 RDF with iterative depth



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# File 'lib/tripleizer.rb', line 37

def rdf rdf_start_class , var=[]
  class_map = Hash.new
  var.each do  |c|
    class_map[c[0].class.to_s]= c
  end
  rdf_string =""
  #get configuration start ->classes
  m = find_models(rdf_start_class)
  if m
    m.values[0].each do |mod,attributes|
      unless mod.eql?("sql_query")
        t_mod = Model.new(mod, rdf_start_class, class_map[mod.to_s])
        #if sql...
        key = t_mod.get_key
        t_mod.get_rows.each do |item|
          rdf_string<<rdf_by_id(mod,rdf_start_class,eval("item.#{key}"))
        end
      end
    end
  end
  rdf_string
end

#rdf_by_id(model_name, class_name, id) ⇒ Object

get a RDF node by its ID and resource-class. Iterative Function, so be carefull with your config not to produce endless loops



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# File 'lib/tripleizer.rb', line 62

def rdf_by_id model_name, class_name, id
  puts model_name
  ret=""
  #TODO...mehrere Models

  model = Model.new(model_name,class_name)   
  data_types= model.get_datatypes
  #build hash
  item=model.get_row_by_id(id).first
  line = Hash.new
  subline = Hash.new
  remove =Array.new

  model.model_attributes.each do |k,v|
    if v.to_s.include?("*") || v.to_s[0..9]=="new_model("
      remove.push(k.to_s) unless remove.index(k.to_s)
      m_class,field=v.to_s.split("*")
      ref_pred,ref_model=k.to_s.split"->"
      if  v.to_s[0..5]=="MODEL("
        m_class.gsub!("MODEL(","Model.new(")
        submodel= eval(m_class.to_s)
        sub_rows= submodel.get_rows
      else
        submodel= eval("item.#{m_class.to_s.downcase}")
        sub_rows= submodel
      end
      sub_rows.each do |subitem|          
        sub_id=eval("subitem.#{field}")  
        ret<< make_triples({:id=>id,k=>sub_id  },class_name,"",Array.new,false)
        ret<<rdf_by_id( submodel.model_name ? submodel.model_name : m_class , ref_model,sub_id).to_s
      end
    else    
      write_line = true;
      #FIXME: use last "." split
      if k.to_s.include? "->"
        line[k.to_s]=eval("item."+v.to_s)
        #write key ref 
        ref_pred,ref_model=k.to_s.split"->"   
        #write referenced model
        #ret<< make_triples({:id=>id,k=>sub_id  },class_name,"",Array.new,false)
        m= find_models(ref_model)
        m.values[0].each do |mod,val|
          ret<<(rdf_by_id mod, ref_model, eval("item."+v.to_s)).to_s
        end
      else        
        if v.to_s.include? "."
          write_line = nil unless eval("item."+v.to_s.downcase.split(".")[0])
        end
        begin
          if v.to_s[0..5]=="CONST("
            line[k.to_s],data_types[k.to_s]= model.get_const(v)
            #datatype to uri format
            if data_types[k.to_s]=="LINK"
              line[k.to_s] =uri line[k.to_s]
              data_types.delete k.to_s
              @object_properties[k.to_s]="t"
            else
              data_types[k.to_s] = uri(data_types[k.to_s])
            end
          else
            line[k.to_s]=eval("item."+v.to_s) if write_line

          end
        rescue Exception => ex
          line[k.to_s]=v.to_s if write_line
        end
      end
    end
    # end
  end
  extract_id_line(model.model_attributes, line, item,data_types)
  remove.each { |rem_attrib|  line.delete(rem_attrib) }
  #get triples of row
  ret<<make_triples(line, class_name , "", data_types)   
  ret
end

#rdfa(rdf_start_class, var = []) ⇒ Object

rdfa generation iterative and returns “hidden” rdfa-div-tags



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# File 'lib/tripleizer.rb', line 141

def rdfa rdf_start_class , var=[]
  #write namespace
  "<div #{@object_namespaces.collect {|pre,ns| "xmlns:"<<pre.to_s<<"=\""<<ns.to_s<<"\" " }}>\n #{rdfa_root(rdf_start_class,var)} </div>"
end

#rdfa_root(rdf_start_class, var = []) ⇒ Object

the root rdf node



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# File 'lib/tripleizer.rb', line 147

def rdfa_root rdf_start_class , var=[]
  #map each var on its classname
  rdfa_string = ""
  class_map = Hash.new
  var.each do  |c|
    class_map[c[0].class.to_s]= c
  end

  #get configuration start ->classes
  m = find_models(rdf_start_class,true)
  if m
    m.values[0].each do |mod,attributes|
      unless mod.eql?("sql_query")
        t_mod = Model.new(mod, rdf_start_class, class_map[mod.to_s])
        #if sql...
        key = t_mod.get_key
        t_mod.get_rows.each do |item|
          rdfa_string<<find_rdfa_by_id(rdf_start_class,eval("item.#{key}"))
        end
      end
    end
  end
  rdfa_string
end

#tripleize(tr_self, c = nil, id = nil) ⇒ Object

not used



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# File 'lib/tripleizer.rb', line 258

def tripleize (tr_self,c =nil,id=nil)
end

#uri(name, default = "") ⇒ Object

generates an uri with the given name



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# File 'lib/tripleizer.rb', line 485

def uri (name,default="")
  
  name=name.to_s
  #FIXME: bad urls (for example just www.example.com will produce an endless-loop
  if name.try(:include?, "://")
    return name[0..name.length-2] if name[-1,1]=="/"
    return name[0..name.length]
  else
    name +="/" unless (name[name.length-1..name.length-1] == ("/" || "#")) || name.try(:include?, ":")

    if name.index(":")    
      t= @object_namespaces[name.split(":")[0].to_sym]
      t ||=""
      t += "/" unless (t[t.length-1..t.length-1] == ("/" || "#") || t.blank?) || name.try(:include?, ":")
      return  uri( t+ normalize_local_name(name.split(":")[1])+"/")
    else     
      t=  default.blank? ?  @base_uri   : default
      t += "/" unless t[t.length-1..t.length-1]=="/"
      return  uri( t + normalize_local_name(name))
    end
  end
end

#write_model(model_name, class_name) ⇒ Object

write the model(s) depending on its RDF-Class name. This is one of the core funktions of rtriplify



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# File 'lib/tripleizer.rb', line 280

def write_model model_name, class_name
  puts model_name
  ret=""
  model = Model.new(model_name,class_name)   
  data_types= model.get_datatypes
  #build hash
  model.get_rows.each do |item|
    line = Hash.new
    subline = Hash.new
    #and now add all mapping-attributes
    remove =Array.new
    model.model_attributes.each do |k,v|
      #        if k.to_s.include?("->")
      if v.to_s.include?("*") || v.to_s[0..9]=="new_model("

        remove.push(k.to_s) unless remove.index(k.to_s)
        m_class,field=v.to_s.split("*")
        ref_pred,ref_model=k.to_s.split"->"
        if  v.to_s[0..5]=="MODEL("
          m_class.gsub!("MODEL(","Model.new(")
          submodel= eval(m_class.to_s).get_rows
        else
          submodel= eval("item.#{m_class.to_s.downcase}")
        end
        submodel.each do |subitem|
          subline[:id] = eval("item.#{model.get_key}")
          subline[k] = eval("subitem.#{field}")
          #extract_id_line(m.model_attributes, subline, subitem, Array.new)
          ret<<make_triples(subline, class_name, false,Array.new,false )
          subline.clear
        end
      else
        write_line = true;
        if v.to_s.include? "."
          write_line = nil unless eval("item."+v.to_s.downcase.split(".")[0])
        end
        begin
          if v.to_s[0..5]=="CONST("
            line[k.to_s],data_types[k.to_s]= model.get_const(v)
            #datatype to uri format
            if data_types[k.to_s]=="LINK"
              line[k.to_s] =uri line[k.to_s]
              data_types.delete k.to_s
              @object_properties[k.to_s]="t"
            else
              data_types[k.to_s] = uri(data_types[k.to_s])
            end
          else
            line[k.to_s]=eval("item."+v.to_s) if write_line
          end
        rescue Exception => ex
          line[k.to_s]=v.to_s if write_line
        end
      end
      # end
    end
    extract_id_line(model.model_attributes, line, item,data_types)
    remove.each { |rem_attrib|  line.delete(rem_attrib) }
    #get triples of row
    ret<<make_triples(line, class_name , "", data_types)
    #render :text =>  t.make_triples(c1, controller , "", t.dbd_types)
  end
  ret
end

#write_rdf_head ⇒ Object

the standard triples at the beginning of your rdf output ( version and licence)



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# File 'lib/tripleizer.rb', line 374

def write_rdf_head
  # $this->writeTriple($self,$this->uri('rdfs:comment'),'Generated by Triplify '.$this->version.' (http://Triplify.org)',true);
  write_triple(@base_uri, uri("rdfs:comment"), 'Generated by Triplify '+'version'+ "  (http://Triplify.org) ", "literal" )
  unless configatron.license.blank?
    #$this->writeTriple($self,'http://creativecommons.org/ns#license',$this->config['license']);
    write_triple(@base_uri,'http://creativecommons.org/ns#license',configatron.license, "literal" )
  end
end

#write_sql(model_name, model_attributes, output) ⇒ Object

Executes a sql command. Better to not use this function



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# File 'lib/tripleizer.rb', line 364

def write_sql model_name, model_attributes,output
  model_attributes.each do|key,query|
    sql=  ActiveRecord::Base.connection();
    (sql.select_all query).each do |row|
      make_triples(row,model_name,"")
    end
  end
end

#write_triple(subject, predicate, object, is_literal = false, dtype = "", lang = "") ⇒ Object

triple will be given to its defined output (json||inner_variable||return value



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# File 'lib/tripleizer.rb', line 459

def write_triple(subject,predicate,object,is_literal=false,dtype="",lang="")
  if @output_json
    oa = {:value=> object,:type=> is_literal ? 'literal' : 'uri'}
    oa['datatype']=dtype if is_literal && dtype
    oa['language']=lang if is_literal && lang
    add_json_pair subject, predicate,oa
    return ""
  else
    #(lang?"@#{lang}":'')
    #define the object
    if(is_literal)
      object = "\"#{object.to_s.gsub('"','%22')}\""+  (dtype.empty? ?  (lang.empty? ? "": "@#{lang}" ):"^^<#{dtype}>" )
    else
      object = ( object[0..1] == "_:" ) ? object : "<#{object}>"
    end
    #object="\"#{object[1..-2].gsub('"','\"')}\""
    #define the subject
    subject = ( subject[0..1] == "_:" ) ? subject : "<#{subject}>"
    if @output
      @output.write "#{subject} <#{predicate}> #{object} .\n"
    end
    return "#{subject} <#{predicate}> #{object} .\n"
  end
end