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From "Hadrian Zbarcea (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CAMEL-3429) Extend DSL with more header filtering constructs
Date Thu, 16 Dec 2010 01:47:02 GMT

    [ https://issues.apache.org/jira/browse/CAMEL-3429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971931#action_12971931
] 

Hadrian Zbarcea commented on CAMEL-3429:
----------------------------------------

That would be an idea, however I assume you meant {{remove}} instead of {{removeHeaders}}
{code}
from("...").headers().remove("x").to("...")
from("...").headers().remove("x", "y", "z").to("...")
{code}

There are a few people in the community now that think we could improve the DSL. Martin tweeted
about his recent dabbling with a Scala dsl. I would like to see a more pluggable dsl and maybe
a dsl builder, kinda the the way camel-bam does it, to better address integration needs of
a specific industry or organization. (Of course we strive to be backwards compatible too).

So anyway, I hope we'll tackle this one soon, I assume right after the holidays.

> Extend DSL with more header filtering constructs
> ------------------------------------------------
>
>                 Key: CAMEL-3429
>                 URL: https://issues.apache.org/jira/browse/CAMEL-3429
>             Project: Camel
>          Issue Type: Improvement
>          Components: camel-core
>    Affects Versions: 2.5.0
>            Reporter: Richard Kettelerij
>             Fix For: Future
>
>         Attachments: remove-headers-camel-core.patch
>
>
> Currently the DSL offers the following methods:
> - {{removeHeader(name)}} which removes a single header
> - {{removeHeaders(pattern)}} remove one or more headers based on a pattern (since 2.3)
> The attached patch extends the DSL with the following methods:
> - {{removeHeaders(name...)}} removes the headers in the given a vararg parameter. 
> - {{removeHeadersExcept(pattern)}} removes all headers except for the ones matching the
given pattern (opposite of {{removeHeaders(pattern)}})
> - {{removeHeadersExcept(name...)}} removes all headers except for the ones in the given
vararg parameter (opposite of {{removeHeaders(name)}})
> The rationale for the removeHeadersExcept() method is that in many cases you want to
take a _defensive_ approach with regard to header propagation.
> Sometimes you may want to remove _every_ header on the current message, in that case
just call removeHeadersExcept() with no arguments.
> In other cases you want to propagate only the "id" header received through the servlet/jetty
component (as a query parameter). In that case call
> removeHeadersExcept("id") to preserve the "id" header, while preventing other query parameters
(and standard HTTP headers) to flow down your route.

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