CODEWITHSUNDEEP
javaapache-camelognlmvelenterprise-integration
Ulrich Schuster
Ulrich Schuster

Reputation: 1896

Access and process field in an Apache Camel exchange

In several of my camel routes, I need to access a field of an object, process it, and use it for something.

For example: Say I have an object of

class myClass {
  int fieldA;
  String fieldB;
}

which is used as an exchange header, say on myOldHeader. In my route definition, I want to access fieldA from this header, process it with, a function of some bean, say String myIntTransform(int), and place the result into some other header. That is, I would like to have an element in my route definition similar to the following (pseudocode):

from(direct:input)
  .setHeader("myNewHeader").method("MyBean", "myIntTransform").on(header("myOldHeader").field("fieldA")
  .to(direct:output)

I know that Camel comes with a zoo of expression languages and DSLs for all sorts of tasks. But so far, I haven't found a convenient way to accomplish the above without having to put specific annotations (like @Header) on "myBean", which would create a tight coupling of beans I am trying to avoid.

Upvotes: 2

Views: 185

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