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https://issues.apache.org/jira/browse/CAMEL-5146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Claus Ibsen resolved CAMEL-5146.
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Resolution: Fixed
> Java DSL - Let ValueBuilder be Predicate to make it easier to use predicates
> in the Java DSL
> --------------------------------------------------------------------------------------------
>
> Key: CAMEL-5146
> URL: https://issues.apache.org/jira/browse/CAMEL-5146
> Project: Camel
> Issue Type: Improvement
> Components: camel-core
> Reporter: Claus Ibsen
> Assignee: Claus Ibsen
> Fix For: 2.10.0
>
>
> The Java DSL with the RouteBuilder has a number of built-in predicates and
> expressions we use in the DSL. Such as with the CBR or Filter etc to define
> predicates.
> ValueBuilder contains many out of the box predicates for the DSL. We should
> let it be predicate as well.
> Then you can use compound predicates such as with not, to stack predicates
> together:
> {code}
> from("direct:start")
> .filter(not(header("foo")))
> .to("mock:result");
> {code}
> Before this was not possible as header from ValueBuilder is only an
> expression. And to fix that you would have to convert that to a predicate
> using a toPredicate static method. Which makes the DSL more verbose and not
> as stream-lined.
> This causes a slight API change as we need to remove retryWhile(Expression)
> in OnException as it has 2 methods to accept a predicate or expression. But
> in reality we should only need the predicate, as that is what retryWhile is
> about.
> This slight API change will break backwards compatibility (eg retryWhile in
> OnException) so we will keep this on the 2.10 trunk.
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