CODEWITHSUNDEEP
javaapache-camel
Aparna
Aparna

Reputation: 845

In Apache Camel how to check if the in coming message contains a string

I am using Apache Camel to pass messages. The program is in Java. I want to check if the incoming message contain text("Fault Code: 0") and ("Warning Code: 0") and if it does then do not send it forward....I have a route as below

    from("direct:operation-send-"+getId())
.id("direct:operation-send-"+getId())
.setHeader(Exchange.HTTP_METHOD, constant("POST"))
.doTry()
      .choice()
           .when( ! body().contains("Fault Code: 0") )               
       .to(httpUrl.getUri())
       .endChoice()
     .endDoTry()
     .doCatch(Exception.class)
         .to("log:HTTP_SEND_CONNECTION_ERROR?level=ERROR&showHeaders=true")
         .to("direct:operation-store-"+getId())

But this part when( ! body().contains("Fault Code: 0") ) is giving me a compilation error. I want to know how to check for a condition(of the text in the message) in a Camel route...........Would appreciate any help!!

Upvotes: 3

Views: 7683

Answers (1)

Jezor
Jezor

Reputation: 3426

Static method body() from BuilderSupport class produces a ValueBuilder object. This object provides a fluent way to build a Predicate, which is one of the idioms in the world of functional Java.

I'm not going to get into details of how Predicates work (you can read about them more here), but they cannot be used as a simple boolean. This means, a predicate cannot be negated with negation sign - !, and that is what you're trying to do here.

So instead of:

.when( ! body().contains("Fault Code: 0") )

you need to use ValueBuilder's methods to form your conditions.

Also, notice that you are trying to check if your body contains a String object. I am not sure if you need to tell ValueBuilder about it, but it seems like a common practice in Camel (which I have never used myself).

Knowing those two things, the solution seems simple. Just replace the offending line with:

.when(bodyAs(String.class).not().contains("Fault Code: 0"))

Camel is a huge library that heavily operates on Java 8 features. Make sure you know how to use them properly first (there are many tutorials, this one for example).

EDIT: the body(Class) method is deprecated in newer versions of Camel (in 2.18.3 at least), so you should use bodyAs(Class) instead.

Always check javadocs when you see a warning, because they should contain information on what to replace deprecates with.

Suppressing a warning it is usually not a good idea!

The deprecated method will be deleted in future releases, and when that happens, it'll break your build.

Upvotes: 1

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