Ref Expression Language

Available as of Camel 2.8

The Ref Expression Language is really just a way to lookup a custom Expression from the Registry.
This is particular useable in XML DSLs.

Example usage

The Splitter in XML DSL can utilize a custom expression using <ref> like:

<bean id="myExpression" class="com.mycompany.MyCustomExpression"/>

...

<route>
  <from uri="seda:a"/>
  <split>
    <ref>myExpression</ref>   
    <to uri="mock:b"/>
  </split>     
</route>

in this case, the Message coming from the seda:a Endpoint will be splitted using a custom Expression which has the id myExpression in the Registry.

And the same example using Java DSL:

from("seda:a").split().ref("myExpression").to("seda:b");

Dependencies

The Constant language is part of camel-core.