Class: SPARQL::Client

Inherits:
Object show all
Defined in:
vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb,
vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client/query.rb,
vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client/repository.rb,
vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client/update.rb,
vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client/version.rb

Overview

A SPARQL 1.0/1.1 client for RDF.rb.

Defined Under Namespace

Modules: Update, VERSION Classes: ClientError, MalformedQuery, Query, QueryElement, Repository, ServerError

Constant Summary

RESULT_JSON =
'application/sparql-results+json'.freeze
RESULT_XML =
'application/sparql-results+xml'.freeze
RESULT_CSV =
'text/csv'.freeze
RESULT_TSV =
'text/tab-separated-values'.freeze
RESULT_BOOL =

Sesame-specific

'text/boolean'.freeze
RESULT_BRTR =

Sesame-specific

'application/x-binary-rdf-results-table'.freeze
RESULT_ALL =
[
  RESULT_JSON,
  RESULT_XML,
  RESULT_BOOL,
  "#{RESULT_TSV};q=0.8",
  "#{RESULT_CSV};q=0.2",
  '*/*;q=0.1'
].join(', ').freeze
GRAPH_ALL =
(
  RDF::Format.content_types.keys + 
  ['*/*;q=0.1']
).join(', ').freeze
ACCEPT_JSON =
{'Accept' => RESULT_JSON}.freeze
ACCEPT_XML =
{'Accept' => RESULT_XML}.freeze
ACCEPT_CSV =
{'Accept' => RESULT_CSV}.freeze
ACCEPT_TSV =
{'Accept' => RESULT_TSV}.freeze
ACCEPT_BRTR =
{'Accept' => RESULT_BRTR}.freeze
ACCEPT_RESULTS =
{'Accept' => RESULT_ALL}.freeze
ACCEPT_GRAPH =
{'Accept' => GRAPH_ALL}.freeze
DEFAULT_PROTOCOL =
1.0
DEFAULT_METHOD =
:post
XMLNS =
{'sparql' => 'http://www.w3.org/2005/sparql-results#'}.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(url, options = {}, &block) ⇒ Client

Initialize a new sparql client, either using the URL of a SPARQL endpoint or an RDF::Queryable instance to use the native SPARQL gem.

Parameters:

Options Hash (options):

  • :method (Symbol) — default: DEFAULT_METHOD
  • :protocol (Number) — default: DEFAULT_PROTOCOL
  • :headers (Hash)
  • :read_timeout (Hash)


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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 90

def initialize(url, options = {}, &block)
  case url
  when RDF::Queryable
    @url, @options = url, options.dup
  else
    @url, @options = RDF::URI.new(url.to_s), options.dup
    @headers = @options.delete(:headers) || {}
    @http = http_klass(@url.scheme)
  end

  if block_given?
    case block.arity
      when 1 then block.call(self)
      else instance_eval(&block)
    end
  end
end

Instance Attribute Details

#headersHash{String => String} (readonly)

The HTTP headers that will be sent in requests to the endpoint.

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 70

def headers
  @headers
end

#optionsHash{Symbol => Object} (readonly)

Any miscellaneous configuration.

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 76

def options
  @options
end

#urlRDF::URI, RDF::Queryable (readonly)

The SPARQL endpoint URL, or an RDF::Queryable instance, to use the native SPARQL engine.

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 64

def url
  @url
end

Class Method Details

.parse_csv_bindings(csv, nodes = {}) ⇒ <RDF::Query::Solutions>



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 425

def self.parse_csv_bindings(csv, nodes = {})
  require 'csv' unless defined?(::CSV)
  csv = CSV.parse(csv.to_s) unless csv.is_a?(Array)
  vars = csv.shift
  solutions = RDF::Query::Solutions.new
  csv.each do |row|
    solution = RDF::Query::Solution.new
    row.each_with_index do |v, i|
      term = case v
      when /^_:(.*)$/ then nodes[$1] ||= RDF::Node($1)
      when /^\w+:.*$/ then RDF::URI(v)
      else RDF::Literal(v)
      end
      solution[vars[i].to_sym] = term
    end
    solutions << solution
  end
  solutions
end

.parse_json_bindings(json, nodes = {}) ⇒ <RDF::Query::Solutions>



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 385

def self.parse_json_bindings(json, nodes = {})
  require 'json' unless defined?(::JSON)
  json = JSON.parse(json.to_s) unless json.is_a?(Hash)
  case
    when json.has_key?('boolean')
      json['boolean']
    when json.has_key?('results')
      solutions = json['results']['bindings'].map do |row|
        row = row.inject({}) do |cols, (name, value)|
          cols.merge(name.to_sym => parse_json_value(value, nodes))
        end
        RDF::Query::Solution.new(row)
      end
      RDF::Query::Solutions.new(solutions)
  end
end

.parse_json_value(value, nodes = {}) ⇒ RDF::Value



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 407

def self.parse_json_value(value, nodes = {})
  case value['type'].to_sym
    when :bnode
      nodes[id = value['value']] ||= RDF::Node.new(id)
    when :uri
      RDF::URI.new(value['value'])
    when :literal
      RDF::Literal.new(value['value'], :datatype => value['datatype'], :language => value['xml:lang'])
    when :typed-literal'
      RDF::Literal.new(value['value'], :datatype => value['datatype'])
    else nil
  end
end

.parse_tsv_bindings(tsv, nodes = {}) ⇒ <RDF::Query::Solutions>



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 449

def self.parse_tsv_bindings(tsv, nodes = {})
  tsv = tsv.lines.map {|l| l.chomp.split("\t")} unless tsv.is_a?(Array)
  vars = tsv.shift.map {|h| h.sub(/^\?/, '')}
  solutions = RDF::Query::Solutions.new
  tsv.each do |row|
    solution = RDF::Query::Solution.new
    row.each_with_index do |v, i|
      if !v.empty?
        term = RDF::NTriples.unserialize(v) || case v
        when /^\d+\.\d*[eE][+-]?[0-9]+$/  then RDF::Literal::Double.new(v)
        when /^\d*\.\d+[eE][+-]?[0-9]+$/  then RDF::Literal::Double.new(v)
        when /^\d*\.\d+$/                 then RDF::Literal::Decimal.new(v)
        when /^\d+$/                      then RDF::Literal::Integer.new(v)
        else
          RDF::Literal(v)
        end
        nodes[term.id] = term if term.is_a? RDF::Node
        solution[vars[i].to_sym] = term
      end
    end
    solutions << solution
  end
  solutions
end

.parse_xml_bindings(xml, nodes = {}) ⇒ <RDF::Query::Solutions>



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 478

def self.parse_xml_bindings(xml, nodes = {})
  xml.force_encoding(::Encoding::UTF_8) if xml.respond_to?(:force_encoding)

  if defined?(::Nokogiri)
    xml = Nokogiri::XML(xml).root unless xml.is_a?(Nokogiri::XML::Document)
    case
      when boolean = xml.xpath("//sparql:boolean", XMLNS)[0]
        boolean.text == 'true'
      when results = xml.xpath("//sparql:results", XMLNS)[0]
        solutions = results.elements.map do |result|
          row = {}
          result.elements.each do |binding|
            name  = binding.attr('name').to_sym
            value = binding.elements.first
            row[name] = parse_xml_value(value, nodes)
          end
          RDF::Query::Solution.new(row)
        end
        RDF::Query::Solutions.new(solutions)
    end
  else
    # REXML
    xml = REXML::Document.new(xml).root unless xml.is_a?(REXML::Element)
    case
      when boolean = xml.elements['boolean']
        boolean.text == 'true'
      when results = xml.elements['results']
        solutions = results.elements.map do |result|
          row = {}
          result.elements.each do |binding|
            name  = binding.attributes['name'].to_sym
            value = binding.select { |node| node.kind_of?(::REXML::Element) }.first
            row[name] = parse_xml_value(value, nodes)
          end
          RDF::Query::Solution.new(row)
        end
        RDF::Query::Solutions.new(solutions)
    end
  end
end

.parse_xml_value(value, nodes = {}) ⇒ RDF::Value



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 523

def self.parse_xml_value(value, nodes = {})
  case value.name.to_sym
    when :bnode
      nodes[id = value.text] ||= RDF::Node.new(id)
    when :uri
      RDF::URI.new(value.text)
    when :literal
      lang     = value.respond_to?(:attr) ? value.attr('xml:lang') : value.attributes['xml:lang']
      datatype = value.respond_to?(:attr) ? value.attr('datatype') : value.attributes['datatype']
      RDF::Literal.new(value.text, :language => lang, :datatype => datatype)
    else nil
  end
end

Instance Method Details

#ask(*args) ⇒ Query

Executes a boolean ASK query.

Parameters:

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 113

def ask(*args)
  call_query_method(:ask, *args)
end

#clear(what, *arguments) #clear(what, *arguments, options = {})

Executes a CLEAR operation.

This requires that the endpoint support SPARQL 1.1 Update.

Examples:

CLEAR GRAPH <http://example.org/>

client.clear(:graph, RDF::URI("http://example.org/"))

CLEAR DEFAULT

client.clear(:default)

CLEAR NAMED

client.clear(:named)

CLEAR ALL

client.clear(:all)

Overloads:

  • #clear(what, *arguments)

    This method returns an undefined value.

    Returns self

    Parameters:

  • #clear(what, *arguments, options = {})

    This method returns an undefined value.

    Returns self

    Parameters:

    Options Hash (options):

    • :silent (Boolean)

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 260

def clear(what, *arguments)
  self.update(Update::Clear.new(what, *arguments))
end

#clear_graph(graph_uri, options = {})

This method returns an undefined value.

Executes a CLEAR GRAPH operation.

This is a convenience wrapper for the #clear method.

Examples:

CLEAR GRAPH <http://example.org/>

client.clear_graph("http://example.org/")

Parameters:

Options Hash (options):

  • :silent (Boolean)

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 225

def clear_graph(graph_uri, options = {})
  self.clear(:graph, graph_uri, options)
end

#construct(*args) ⇒ Query

Executes a graph CONSTRUCT query.

Parameters:

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 140

def construct(*args)
  call_query_method(:construct, *args)
end

#delete_data(data, options = {})

This method returns an undefined value.

Executes a DELETE DATA operation.

This requires that the endpoint support SPARQL 1.1 Update.

Examples:

Deleting data sourced from a file or URL

data = RDF::Graph.load("https://raw.githubusercontent.com/ruby-rdf/rdf/develop/etc/doap.nt")
client.delete_data(data)

Deleting data from a named graph

client.delete_data(data, :graph => "http://example.org/")

Parameters:

Options Hash (options):

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 192

def delete_data(data, options = {})
  self.update(Update::DeleteData.new(data, options))
end

#delete_insert(delete_graph, insert_graph = nil, where_graph = nil, options = {})

This method returns an undefined value.

Executes a DELETE/INSERT operation.

This requires that the endpoint support SPARQL 1.1 Update.

Parameters:

Options Hash (options):

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 208

def delete_insert(delete_graph, insert_graph = nil, where_graph = nil, options = {})
  self.update(Update::DeleteInsert.new(delete_graph, insert_graph, where_graph, options))
end

#describe(*args) ⇒ Query

Executes a DESCRIBE query.

Parameters:

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 131

def describe(*args)
  call_query_method(:describe, *args)
end

#http_klass(scheme) ⇒ Net::HTTP::Proxy (protected)

Returns an HTTP class or HTTP proxy class based on the http_proxy and https_proxy environment variables.

Parameters:

Returns:

  • (Net::HTTP::Proxy)


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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 651

def http_klass(scheme)
  proxy_url = nil
  case scheme
    when 'http'
      value = ENV['http_proxy']
      proxy_url = URI.parse(value) unless value.nil? || value.empty?
    when 'https'
      value = ENV['https_proxy']
      proxy_url = URI.parse(value) unless value.nil? || value.empty?
  end
  klass = if Net::HTTP::Persistent::VERSION >= '3.0'
    Net::HTTP::Persistent.new(name: self.class.to_s, proxy: proxy_url)
  else
    Net::HTTP::Persistent.new(self.class.to_s, proxy_url)
  end
  klass.keep_alive =  @options[:keep_alive] || 120
  klass.read_timeout = @options[:read_timeout] || 60
  klass
end

#insert_data(data, options = {})

This method returns an undefined value.

Executes an INSERT DATA operation.

This requires that the endpoint support SPARQL 1.1 Update.

Note that for inserting non-trivial amounts of data, you probably ought to consider using the RDF store's native bulk-loading facilities or APIs, as INSERT DATA operations entail comparably higher parsing overhead.

Examples:

Inserting data constructed ad-hoc

client.insert_data(RDF::Graph.new { |graph|
  graph << [:jhacker, RDF::Vocab::FOAF.name, "J. Random Hacker"]
})

Inserting data sourced from a file or URL

data = RDF::Graph.load("https://raw.githubusercontent.com/ruby-rdf/rdf/develop/etc/doap.nt")
client.insert_data(data)

Inserting data into a named graph

client.insert_data(data, :graph => "http://example.org/")

Parameters:

Options Hash (options):

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 171

def insert_data(data, options = {})
  self.update(Update::InsertData.new(data, options))
end

#inspectString

Returns a developer-friendly representation of this object.

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 639

def inspect
  sprintf("#<%s:%#0x(%s)>", self.class.name, __id__, url.to_s)
end

#inspect!

This method returns an undefined value.

Outputs a developer-friendly representation of this object to stderr.



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 631

def inspect!
  warn(inspect)
end

#make_get_request(query, headers = {}) ⇒ Net::HTTPRequest (protected)

Constructs an HTTP GET request according to the SPARQL Protocol.

Parameters:

Returns:

  • (Net::HTTPRequest)

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 726

def make_get_request(query, headers = {})
  url = self.url.dup
  url.query_values = (url.query_values || {}).merge(:query => query.to_s)
  request = Net::HTTP::Get.new(url.request_uri, self.headers.merge(headers))
  request
end

#make_post_request(query, headers = {}) ⇒ Net::HTTPRequest (protected)

Constructs an HTTP POST request according to the SPARQL Protocol.

Parameters:

Returns:

  • (Net::HTTPRequest)

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 741

def make_post_request(query, headers = {})
  if @alt_endpoint.nil?
    endpoint = url.request_uri 
  else
    endpoint = @alt_endpoint
  end
  request = Net::HTTP::Post.new(endpoint, self.headers.merge(headers))
  case (self.options[:protocol] || DEFAULT_PROTOCOL).to_s
    when '1.1'
      request['Content-Type'] = 'application/sparql-' + (@op || :query).to_s
      request.body = query.to_s
    when '1.0'
      request.set_form_data((@op || :query) => query.to_s)
    else
      raise ArgumentError, "unknown SPARQL protocol version: #{self.options[:protocol].inspect}"
  end
  request
end

#parse_rdf_serialization(response, options = {}) ⇒ RDF::Enumerable

Parameters:

  • response (Net::HTTPSuccess)
  • options (Hash{Symbol => Object}) (defaults to: {})

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 541

def parse_rdf_serialization(response, options = {})
  options = {:content_type => response.content_type} unless options[:content_type]
  if reader = RDF::Reader.for(options)
    reader.new(response.body)
  else
    raise RDF::ReaderError, "no suitable rdf reader was found."
  end
end

#parse_response(response, options = {}) ⇒ Object

Parameters:

  • response (Net::HTTPSuccess)
  • options (Hash{Symbol => Object}) (defaults to: {})

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 362

def parse_response(response, options = {})
  case options[:content_type] || response.content_type
    when NilClass
      response.body
    when RESULT_BOOL # Sesame-specific
      response.body == 'true'
    when RESULT_JSON
      self.class.parse_json_bindings(response.body, nodes)
    when RESULT_XML
      self.class.parse_xml_bindings(response.body, nodes)
    when RESULT_CSV
      self.class.parse_csv_bindings(response.body, nodes)
    when RESULT_TSV
      self.class.parse_tsv_bindings(response.body, nodes)
    else
      parse_rdf_serialization(response, options)
  end
end

#query(query, options = {}) ⇒ Array<RDF::Query::Solution>

Executes a SPARQL query and returns the parsed results.

Parameters:

Options Hash (options):

Returns:

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 292

def query(query, options = {})
  @op = :query
  @alt_endpoint = options[:endpoint]
  case @url
  when RDF::Queryable
    require 'sparql' unless defined?(::SPARQL::Grammar)
    begin
      SPARQL.execute(query, @url, options)
    rescue SPARQL::MalformedQuery
      $stderr.puts "error running #{query}: #{$!}"
      raise
    end
  else
    parse_response(response(query, options), options)
  end
end

#request(query, headers = {}) {|response| ... } ⇒ Net::HTTPResponse (protected)

Performs an HTTP request against the SPARQL endpoint.

Parameters:

Yields:

Yield Parameters:

  • response (Net::HTTPResponse)

Returns:

  • (Net::HTTPResponse)

Raises:

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 680

def request(query, headers = {}, &block)
  # Make sure an appropriate Accept header is present
  headers['Accept'] ||= if (query.respond_to?(:expects_statements?) ?
                            query.expects_statements? :
                            (query =~ /CONSTRUCT|DESCRIBE|DELETE|CLEAR/))
    GRAPH_ALL
  else
    RESULT_ALL
  end

  request = send("make_#{request_method(query)}_request", query, headers)

  request.basic_auth(url.user, url.password) if url.user && !url.user.empty?

  pre_http_hook(request) if respond_to?(:pre_http_hook)

  response = @http.request(::URI.parse(url.to_s), request)

  post_http_hook(response) if respond_to?(:post_http_hook)

  10.times do
    if response.kind_of? Net::HTTPRedirection
      response = @http.request(::URI.parse(response['location']), request)
    else
      return block_given? ? block.call(response) : response 
    end          
  end
  raise ServerError, "Infinite redirect at #{url}. Redirected more than 10 times."
end

#request_method(query) ⇒ Object (protected)

Return the HTTP verb for posting this request. this is useful if you need to override the HTTP verb based on the request being made. (e.g. Marmotta 3.3.0 requires GET for DELETE requests, but can accept POST for INSERT)



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 714

def request_method(query)
  (options[:method] || DEFAULT_METHOD).to_sym
end

#response(query, options = {}) ⇒ String

Executes a SPARQL query and returns the Net::HTTP::Response of the result.

Parameters:

Options Hash (options):

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 341

def response(query, options = {})
  headers = options[:headers] || {}
  headers['Accept'] = options[:content_type] if options[:content_type]
  request(query, headers) do |response|
    case response
      when Net::HTTPBadRequest  # 400 Bad Request
        raise MalformedQuery.new(response.body + " Processing query #{query}")
      when Net::HTTPClientError # 4xx
        raise ClientError.new(response.body + " Processing query #{query}")
      when Net::HTTPServerError # 5xx
        raise ServerError.new(response.body + " Processing query #{query}")
      when Net::HTTPSuccess     # 2xx
        response
    end
  end
end

#select(*args) ⇒ Query

Executes a tuple SELECT query.

Parameters:

Returns:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 122

def select(*args)
  call_query_method(:select, *args)
end

#update(query, options = {})

This method returns an undefined value.

Executes a SPARQL update operation.

Parameters:

Options Hash (options):

See Also:



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# File 'vendor/bundler/ruby/2.4.0/bundler/gems/sparql-client-f33da4e3600f/lib/sparql/client.rb', line 319

def update(query, options = {})
  @op = :update
  @alt_endpoint = options[:endpoint]
  case @url
  when RDF::Queryable
    require 'sparql' unless defined?(::SPARQL::Grammar)
    SPARQL.execute(query, @url, options.merge(update: true))
  else
    response(query, options)
  end
  self
end