If Else Mediator

The If Else Mediator can be used for filtering messages based on a Synapse expression, XPath, JSONPath or a regular expression. If the condition succeeds, the If Else mediator executes the other mediators enclosed in the sequence.

Syntax

<filter (source="[SynapseExpression|XPath|json-eval(JSONPath)]" regex="string") | xpath="[SynapseExpression|XPath|json-eval(JSONPath)]">
   mediator+
</filter>

This mediator could also be used to handle a scenario where two different sequences are applied to messages that meet the filter criteria and messages that do not meet the filter criteria.

<filter (source="[SynapseExpression|XPath|json-eval(JSONPath)]" regex="string") | xpath="[SynapseExpression|XPath|json-eval(JSONPath)]">
   <then>
     mediator+
   </then>
   <else>
     mediator+
   </else>
</filter>

In this case, the filter condition remains the same. The messages that match the filter criteria will be mediated using the set of mediators enclosed in the then element. The messages that do not match the filter criteria will be mediated using the set of mediators enclosed in the else element.

Configuration

The parameters available for configuring the If Else mediator are as follows:

Parameter Name	Description
Condition	This is used to specify the condition that resolves to a boolean value. The message will be branched based on the result of this condition.

Advanced configurations

Parameters available to configure advanced properties of the If Else mediator are as follows:

Parameter Name	Description
Use a regex pattern	If this is selected, the condition will use a regex-based evaluation.
Expression	An expression that resolves to a string value, which will be compared with the regex pattern. This field is enabled only when Use a regex pattern is selected.
Matches	The regex pattern to compare with the evaluated expression. This field is enabled only when Use a regex pattern is selected.

Examples

Approving or rejecting loan applications based on a condition

In this example, the If Else Mediator will check the credit score in a loan application and decide whether to approve or reject it. If the credit score is 1000, the application is approved; otherwise, it is rejected.

<filter xpath="${payload.loanApplication.creditScore == 1000}">
   <then>
      <log category="INFO">
         <message>ApprovalStatus = Approved</message>
      </log>
      <sequence key="loan_approval_seq"/>
   </then>
   <else>
      <log category="INFO">
         <message>ApprovalStatus = Rejected</message>
      </log>
      <sequence key="loan_rejection_seq"/>
   </else>
</filter>