Class OpenWFE::CaseExpression
In: lib/openwfe/expressions/fe_if.rb
Parent: FlowExpression

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’.

Methods

apply   reply   trigger_child  

Attributes

evaluating_condition  [RW]  set to ‘true’ when the case expression is actually evaluating a condition (ie not triggering a consequence).
offset  [RW]  keeping track of where we are in the case iteration

Public Instance methods

apply(workitem)

[Source]

     # File lib/openwfe/expressions/fe_if.rb, line 231
231:         def apply (workitem)
232: 
233:             #workitem.unset_result
234:                 #
235:                 # since OpenWFEru 0.9.16 previous __result__ values
236:                 # are not erased before a 'case'.
237: 
238:             @offset = nil
239: 
240:             trigger_child workitem, true
241:         end
reply(workitem)

[Source]

     # File lib/openwfe/expressions/fe_if.rb, line 243
243:         def reply (workitem)
244: 
245:             if @evaluating_condition
246: 
247:                 result = workitem.get_boolean_result
248: 
249:                 #ldebug { "reply() result : '#{result.to_s}' (#{result.class})" }
250: 
251:                 trigger_child workitem, !result
252:             else
253: 
254:                 reply_to_parent workitem
255:             end
256:         end

Protected Instance methods

trigger_child(workitem, is_condition)

[Source]

     # File lib/openwfe/expressions/fe_if.rb, line 260
260:             def trigger_child (workitem, is_condition)
261: 
262:                 @offset = if !@offset
263:                     0
264:                 elsif is_condition
265:                     @offset + 2
266:                 else
267:                     @offset + 1
268:                 end
269: 
270:                 #ldebug { "trigger_child() is_condition ? #{is_condition}" }
271:                 #ldebug { "trigger_child() next offset is #{@offset}" }
272: 
273:                 unless @children[@offset]
274:                     reply_to_parent workitem
275:                     return
276:                 end
277: 
278:                 @evaluating_condition = is_condition
279: 
280:                 store_itself
281: 
282:                 get_expression_pool.apply(@children[@offset], workitem)
283:             end

[Validate]