Class: OpenWFE::CaseExpression

Inherits:
FlowExpression show all
Defined in:
lib/openwfe/expressions/fe_if.rb

Overview

The ‘case’ expression.

<case>

    <equals field="f0" other-value="ready" />
    <participant ref="alpha" />

    <if test="${supply_level} == ${field:supply_request}" />
    <participant ref="bravo" />

    <participant ref="charly" />

</case>

A generalized ‘if’. Will evaluate its children, expecting the order :

- condition
- consequence
- condition
- consequence
...
- else consequence (optional)

The ‘switch’ nickname can be used for ‘case’.

Instance Attribute Summary collapse

Attributes inherited from FlowExpression

#apply_time, #attributes, #children, #environment_id, #fei, #parent_id, #raw_representation

Attributes included from Contextual

#application_context

Instance Method Summary collapse

Methods inherited from FlowExpression

#cancel, #clean_children, #delete_variable, #dup_environment, #fetch_environment, #fetch_text_content, #get_binding, #get_environment, #get_parent, #get_root_environment, #has_attribute, #initialize, is_definition, is_definition?, #lookup_attribute, #lookup_attributes, #lookup_boolean_attribute, #lookup_comma_list_attribute, #lookup_downcase_attribute, #lookup_ref, #lookup_string_attribute, #lookup_sym_attribute, #lookup_value, #lookup_variable, #lookup_vf_attribute, names, #new_environment, new_exp, #owns_its_environment?, #paused?, #remove_child, #reply_to_parent, #set_variable, #store_itself, #synchronize, #to_s, #to_yaml_properties

Methods included from Contextual

#get_work_directory, #init_service, #lookup

Methods included from Logging

#ldebug, #ldebug_callstack, #lerror, #lfatal, #linfo, #llog, #lunknown, #lwarn

Methods included from OwfeServiceLocator

#get_engine, #get_error_journal, #get_expool, #get_expression_map, #get_expression_pool, #get_expression_storage, #get_expression_storages, #get_journal, #get_participant_map, #get_scheduler, #get_wfid_generator

Methods inherited from ObjectWithMeta

#class_def, meta_def, meta_eval, metaclass

Constructor Details

This class inherits a constructor from OpenWFE::FlowExpression

Instance Attribute Details

#evaluating_condition ⇒ Object

set to ‘true’ when the case expression is actually evaluating a condition (ie not triggering a consequence).



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# File 'lib/openwfe/expressions/fe_if.rb', line 228

def evaluating_condition
  @evaluating_condition
end

#offset ⇒ Object

keeping track of where we are in the case iteration



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# File 'lib/openwfe/expressions/fe_if.rb', line 222

def offset
  @offset
end

Instance Method Details

#apply(workitem) ⇒ Object 



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# File 'lib/openwfe/expressions/fe_if.rb', line 231

def apply (workitem)

    #workitem.unset_result
        #
        # since OpenWFEru 0.9.16 previous __result__ values
        # are not erased before a 'case'.

    @offset = nil

    trigger_child workitem, true
end

#reply(workitem) ⇒ Object 



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# File 'lib/openwfe/expressions/fe_if.rb', line 243

def reply (workitem)

    if @evaluating_condition

        result = workitem.get_boolean_result

        #ldebug { "reply() result : '#{result.to_s}' (#{result.class})" }

        trigger_child workitem, !result
    else

        reply_to_parent workitem
    end
end