Class: Alf::Sql::Processor::Where

Inherits:
Alf::Sql::Processor show all
Defined in:
lib/alf/sql/processor/where.rb

Constant Summary

Constants inherited from Alf::Sql::Processor

UnexpectedError

Instance Attribute Summary

Attributes inherited from Alf::Sql::Processor

#builder

Instance Method Summary collapse

Methods inherited from Alf::Sql::Processor

#on_set_operator, #on_with_exp

Constructor Details

#initialize(predicate, builder) ⇒ Where

Returns a new instance of Where.



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# File 'lib/alf/sql/processor/where.rb', line 6

def initialize(predicate, builder)
  super(builder)
  @predicate = predicate
end

Instance Method Details

#on_select_exp(sexpr) ⇒ Object 



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# File 'lib/alf/sql/processor/where.rb', line 11

def on_select_exp(sexpr)
  pred = @predicate.rename(sexpr.desaliaser).sexpr
  if sexpr.where_clause
    anded = [:and, sexpr.where_clause.predicate, pred ]
    anded = Alf::Predicate::Grammar.sexpr(anded)
    sexpr.with_update(:where_clause, [ :where_clause, anded ])
  else
    sexpr.with_insert(4, [ :where_clause, pred ])
  end
end