Page Comparison

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The Filter Mediator closely resembles the "If-else" control structure.

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Syntax

<filter (source="xpath" regex="string") | xpath="xpath">
   mediator+
 </filter>

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One could also use this Mediator to handle the failure case as well, in this case the configuration would be as follows:

<filter (source="xpath" regex="string") | xpath="xpath">
   <then [sequence="string"]>
     mediator+
   </then>
   <else [sequence="string"]>
     mediator+
   </else>
 </filter>

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• Specify As -Specifies whether you give the condition as an XPath or a Regular expression.
• XPath - XPath expression if you selected the "Specify As" option to "XPath".

• Source - XPath expression to locate the value which is going match with the regular expression that you can define below.

  Info
  title Tip
  You can click the "Namespaces" link to add namespaces if you are providing an expression. You will be provided another panel named "Namespace Editor," where you can provide any number of namespace prefixes and URL that you have used in the XPath expression. See Common Screens and Dialog Boxes.

• Regex - Regular expression to match with the source value.

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Example

<filter source="get-property('To')" regex=".*/StockQuote.*">
      <then>
          <send/>
      </then>
      <else>
          <drop/>
      </else>
  </filter>

In this example, Filter will get the To header value and match it against the given regular expression. If this evaluation returns true, it will send the message. If the evaluation returns false, it will drop the message.