Class: Sasquatch::Changeset

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(subject_of_change, resource = nil) ⇒ Changeset

Returns a new instance of Changeset.



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# File 'lib/sasquatch/changeset.rb', line 30

def initialize(subject_of_change, resource=nil)
  @resource = RDF::Node.new unless resource
  @subject_of_change = subject_of_change
  @statements = []
  @statements.concat [RDF::Statement.new(@resource, RDF.type, RDF::Talis::Changeset.ChangeSet),
   RDF::Statement.new(@resource, RDF::Talis::Changeset.changeReason, "Generated in Platform Party"),
   RDF::Statement.new(@resource, RDF::Talis::Changeset.createdDate, Time.now),
   RDF::Statement.new(@resource, RDF::Talis::Changeset.subjectOfChange, subject_of_change)]
end

Instance Attribute Details

#resource ⇒ Object (readonly)

Returns the value of attribute resource.



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# File 'lib/sasquatch/changeset.rb', line 29

def resource
  @resource
end

#statements ⇒ Object (readonly)

Returns the value of attribute statements.



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# File 'lib/sasquatch/changeset.rb', line 29

def statements
  @statements
end

#subject_of_change ⇒ Object (readonly)

Returns the value of attribute subject_of_change.



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# File 'lib/sasquatch/changeset.rb', line 29

def subject_of_change
  @subject_of_change
end

Instance Method Details

#add_statements(stmts) ⇒ Object 



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# File 'lib/sasquatch/changeset.rb', line 48

def add_statements(stmts)
  stmts = [stmts] if stmts.is_a?(RDF::Statement)
  stmts.each do |stmt|
    next unless stmt
    raise ArgumentError unless stmt.subject == @subject_of_change        
    @statements.concat changeset_statement(stmt, :addition)
  end
end

#changeset_statement(stmt, action) ⇒ Object 



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# File 'lib/sasquatch/changeset.rb', line 57

def changeset_statement(stmt, action)
  s = RDF::Node.new
  [RDF::Statement.new(@resource, RDF::Talis::Changeset.send(action), s),
    RDF::Statement.new(s, RDF.type, RDF.to_rdf+"Statement"),
    RDF::Statement.new(s, RDF.subject, stmt.subject),
    RDF::Statement.new(s, RDF.predicate, stmt.predicate),
    RDF::Statement.new(s, RDF.object, stmt.object)]
end

#remove_statements(stmts) ⇒ Object 



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# File 'lib/sasquatch/changeset.rb', line 40

def remove_statements(stmts)
  stmts = [stmts] if stmts.is_a?(RDF::Statement)
  stmts.each do |stmt|
    raise ArgumentError unless stmt.subject == @subject_of_change        
    @statements.concat changeset_statement(stmt, :removal)
  end
end