Class: Alf::Update::Updater

Inherits:

Algebra::Compiler

• Object
• Algebra::Compiler
• Alf::Update::Updater

Defined in:

lib/alf-update/alf/update/updater.rb

Instance Method Summary

• #not_supported(expr, *args) ⇒ Object (also: #on_autonum, #on_clip, #on_coerce, #on_compact, #on_defaults, #on_generator, #on_sort, #on_type_safe, #on_extend, #on_group, #on_infer_heading, #on_intersect, #on_join, #on_matching, #on_minus, #not_matching, #on_project, #on_quota, #on_rank, #on_rename, #on_summarize, #on_ungroup, #on_union, #on_unwrap, #on_wrap)

  overridings.

• #on_leaf_operand(expr, updating, predicate) ⇒ Object

  leaf Operand, recursion end :-).

• #on_restrict(expr, updating, predicate) ⇒ Object

Methods inherited from Algebra::Compiler

#apply, #call, #on_missing

Methods included from Algebra::Visitor

#copy_and_apply

Instance Method Details

#not_supported(expr, *args) ⇒ Object Also known as: on_autonum, on_clip, on_coerce, on_compact, on_defaults, on_generator, on_sort, on_type_safe, on_extend, on_group, on_infer_heading, on_intersect, on_join, on_matching, on_minus, not_matching, on_project, on_quota, on_rank, on_rename, on_summarize, on_ungroup, on_union, on_unwrap, on_wrap

overridings

Raises:

• (NotSupportedError)

# File 'lib/alf-update/alf/update/updater.rb', line 7

def not_supported(expr, *args)
  raise NotSupportedError, "Unable to update through `#{expr}`"
end

#on_leaf_operand(expr, updating, predicate) ⇒ Object

leaf Operand, recursion end :-)

# File 'lib/alf-update/alf/update/updater.rb', line 13

def on_leaf_operand(expr, updating, predicate)
  expr.to_relvar.update(updating, predicate)
end

#on_restrict(expr, updating, predicate) ⇒ Object

# File 'lib/alf-update/alf/update/updater.rb', line 43

def on_restrict(expr, updating, predicate)
  apply(expr.operand, updating, expr.predicate & predicate)
end