Module: SPARQL::Algebra::Update Abstract

Included in:
Operator::Add, Operator::Clear, Operator::Copy, Operator::Create, Operator::Delete, Operator::DeleteData, Operator::DeleteWhere, Operator::Drop, Operator::Insert, Operator::InsertData, Operator::Load, Operator::Modify, Operator::Move, Operator::Sequence, Operator::Update, Operator::With
Defined in:
lib/sparql/algebra/update.rb

Overview

This module is abstract.

A SPARQL algebra Update can make modifications to it’s dataset

Mixin with SPARQL::Algebra::Operator to provide update-like operations on graphs

Instance Method Summary collapse

Instance Method Details

#execute(queryable, **options, &block) ⇒ RDF::Writable

Executes this upate on the given queryable graph or repository.

Parameters:

  • queryable (RDF::Writable) —

    the graph or repository to write

  • options (Hash{Symbol => Object}) —

    any additional keyword options

Options Hash (**options):

  • debug (Boolean) —

    Query execution debugging

Returns:

  • (RDF::Writable) —

    Returns the dataset.

Raises:

  • (NotImplementedError) —

    If an attempt is made to perform an unsupported operation

See Also:



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# File 'lib/sparql/algebra/update.rb', line 42

def execute(queryable, **options, &block)
  raise NotImplementedError, "#{self.class}#execute(#{queryable})"
end

#graph_name=(value) ⇒ RDF::URI, RDF::Query::Variable

Add graph_name to sub-items, unless they already have a graph_name

Parameters:

Returns:



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# File 'lib/sparql/algebra/update.rb', line 49

def graph_name=(value)
  operands.each do |operand|
    operand.graph_name = value if operand.respond_to?(:graph_name) && operand.graph_name != false
  end
  value
end

#unshift(query)

This method returns an undefined value.

Prepends an operator.

Parameters:



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# File 'lib/sparql/algebra/update.rb', line 15

def unshift(query)
  @operands.unshift(query)
  self
end

#variables ⇒ Hash{Symbol => RDF::Query::Variable}

The variables used in this update.

Returns:



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# File 'lib/sparql/algebra/update.rb', line 24

def variables
  operands.inject({}) {|hash, o| o.executable? ? hash.merge(o.variables) : hash}
end