Class: ConceptQL::Scope

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

Overview

Scope coordinates the creation of any TempTables that might be used when a Recall operator is present in the statement.

Any time an operator is given a label, it becomes a candidate for a Recall operator to reuse the output of that operator somewhere else in the statement.

Scope keeps track of all labeled operators and provides an API for Recall operators to fetch the results/types from labeled operators.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Scope 



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# File 'lib/conceptql/scope.rb', line 16

def initialize
  @known_operators = {}
  @flagged = {}
end

Instance Attribute Details

#known_operators ⇒ Object (readonly)

Returns the value of attribute known_operators.



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# File 'lib/conceptql/scope.rb', line 15

def known_operators
  @known_operators
end

#person_ids ⇒ Object

Returns the value of attribute person_ids.



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# File 'lib/conceptql/scope.rb', line 14

def person_ids
  @person_ids
end

Instance Method Details

#add_operator(operator) ⇒ Object 



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# File 'lib/conceptql/scope.rb', line 21

def add_operator(operator)
  # Recall operators respond to source, so when we add such an
  # operator, we want to flag it so that we can come back to it later
  # and create the appropriate temp tables
  if operator.respond_to?(:source)
    flagged[operator.source] = true
  end
  return unless operator.label
  known_operators[operator.label] = operator
end

#from(db, label) ⇒ Object 



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# File 'lib/conceptql/scope.rb', line 32

def from(db, label)
  temp_table(db, label).from(db)
end

#prep(db) ⇒ Object 



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# File 'lib/conceptql/scope.rb', line 46

def prep(db)
  temp_tables(db).values.map do |temp|
    temp.build(db)
  end
end

#sql(db) ⇒ Object 



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# File 'lib/conceptql/scope.rb', line 40

def sql(db)
  temp_tables(db).values.map do |temp|
    temp.sql(db)
  end
end

#types(label) ⇒ Object 



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# File 'lib/conceptql/scope.rb', line 36

def types(label)
  fetch_operator(label).types
end