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If

BPMN Implementation: Conditional Pattern

An If container executes an activity based on one or more conditions defined by the If and optional Else If elements, followed by an optional else element. The conditions are evaluated in order, and the first one to evaluate to true has its activity executed. The if container is a good choice if all conditionals can be evaluated to a true or false condition.

If you do not define a branch, an implied Else executes an empty activity.

Required Properties	Optional Properties
If Condition	Name. See Selecting Activity Labels
	Join Condition. See Creating a Join Condition for an Incoming Link
	Suppress Join Failure. See Process Properties
	Comment. See Adding Comments to a Process
	Documentation. See Adding Documentation to a Process
	See Setting Visual Properties and Using Your Own Library of Images.
	Execution State. See Viewing the Execution State of an Activity or Link
	Extension Attributes and Extension Elements. See Declaring Extension Elements and Attributes.
	Extension Attributes and Elements. See Declaring Extension Elements and Attributes.

To build an If:

From the Control Flow
palette, drag a Conditional Pattern
activity to the Process Editor canvas.

Double-click the If Condition
container to open the Expression Builder.

Alternately, in the Properties view, click the

Dialog (...) Button

next to If Expression.

Select the variables, functions and operators to build a Boolean expression. For details, see Using the Expression Builder.

From the Activity
palette, drag an activity to the If Condition container, and select activity properties.

Repeat Steps 2 through 5 for the Else If
or Else
branches, if desired.

The following illustration shows an example of an If activity.

XML Syntax

<if standard-attributes> 
    standard-elements
    <condition expressionlanguage="anyURI"?>
       bool-expr
    </condition>
      activity
  <elseif>*
    <condition expressionlanguage="anyURI"?>
       bool-expr
    </condition>
      activity
  </elseif>
  <else>?
   activity
  </else>
</if>

Example:

<if xmlns:inventory="http://supply-chain.org/inventory"
    xmlns:FLT="http://example.com/faults">
  <condition>
    bpel:getVariableProperty('stockResult',
     'inventory:level') > 100
  </condition>
    <flow>
      <!-- perform fulfillment work -->
    </flow>
  <elseif>
    <condition>
      <bpel:getVariableProperty('stockResult',
       'inventory:level') >= 0
    </condition>
     <throw faultName="FLT:OutOfStock"
        variable="RestockEstimate" />
  </elseif>
  <else>
     <throw faultName="FLT:ItemDiscontinued" />
  </else>
 </if>

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