Type Filter mediation primitive

Introduction

You can use the Type Filter mediation primitive with XPath expressions to direct messages down different paths of a flow, based on their type.

The Type Filter mediation primitive has one input terminal (in), one fail terminal (fail), and multiple output terminals, (one of which is the default terminal). The in terminal is wired to accept a message and the other terminals are wired to propagate a message.

Each of the output terminals, apart from the default terminal, is associated with an XPath expression and a type. The elements of the message identified by the XPath expressions are compared, in turn, with the associated type. The primitive always uses the first matching output terminal. The default terminal is used if the message meets none of the conditions.

If an exception occurs during the filtering, the fail terminal propagates the original message, together with any exception information.

Usage

You can use the Type Filter mediation primitive to check that the inbound message has elements of a specific type. If the criterion is not met you can raise a fault using the Fail mediation primitive, or send an error response.