Class: Ruote::Exp::IfExpression

Inherits:
FlowExpression show all
Defined in:
lib/ruote/exp/fe_if.rb

Overview

Here are examples of the ‘if’ expression in use :

_if do
  equals :field_value => 'customer', :other_value => 'British Petroleum'
  participant :ref => 'Allister'
end

and :

_if :test => '${f:customer} == British Petroleum' do
  participant :ref => 'Allister'
end

An else clause is accepted :

_if do
  equals :field_value => 'customer', :other_value => 'British Petroleum'
  participant :ref => 'Allister'
  participant :ref => 'Bernardo'
end

or :

_if :test => '${f:customer} == British Petroleum' do
  participant :ref => 'Allister'
  participant :ref => 'Bernardo'
end

Note that any expression accepts an :if attribute :

participant :ref => 'Al', :if => '${f:customer} == British Petroleum'

shorter

The :test can be shortened to a :t :

_if :t => '${f:customer.name} == Fred' do
  subprocess 'premium_course'
  subprocess 'regular_course'
end

When using Ruby to generate the process definition tree, you can simply do :

_if '${f:customer.name} == Fred' do
  subprocess 'premium_course'
  subprocess 'regular_course'
end

Constant Summary

Constants inherited from FlowExpression

FlowExpression::COMMON_ATT_KEYS

Instance Attribute Summary

Attributes inherited from FlowExpression

#context, #error, #h

Instance Method Summary collapse

Methods inherited from FlowExpression

#ancestor?, #att, #attribute, #attribute_text, #attributes, #cancel, #compile_atts, #compile_variables, do_action, #do_apply, #do_cancel, #do_fail, #do_pause, #do_persist, #do_reply, #do_resume, #do_unpersist, #expand_atts, #fei, fetch, from_h, #handle_on_error, #has_attribute, #initial_persist, #initialize, #iterative_var_lookup, #launch_sub, #lookup_on_error, #lookup_val, #lookup_val_prefix, #lookup_variable, #name, names, #parent, #parent_id, #persist_or_raise, #reply_to_parent, #set_variable, #to_h, #tree, #tree_children, #try_persist, #try_unpersist, #unpersist_or_raise, #unset_variable, #update_tree, #variables

Methods included from WithMeta

#class_def, included

Methods included from WithH

included

Constructor Details

This class inherits a constructor from Ruote::Exp::FlowExpression

Instance Method Details

#apply ⇒ Object 



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# File 'lib/ruote/exp/fe_if.rb', line 82

def apply

  reply(h.applied_workitem)
end

#reply(workitem) ⇒ Object

called by ‘else’, ‘then’ or perhaps ‘equals’



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# File 'lib/ruote/exp/fe_if.rb', line 89

def reply(workitem)

  if workitem['fei'] == h.fei # apply --> reply

    h.test = attribute(:test)
    h.test = attribute(:t) if h.test.nil?
    h.test = attribute_text if h.test.nil?
    h.test = nil if h.test == ''

    offset = (h.test.nil? || Condition.true?(h.test)) ? 0 : 1

    apply_child(offset, workitem)

  else # reply from a child

    if h.test != nil || Ruote::FlowExpressionId.child_id(workitem['fei']) != 0

      reply_to_parent(workitem)

    else

      apply_child(workitem['fields']['__result__'] == true ? 1 : 2, workitem)
    end
  end
end