Repository: camel Updated Branches: refs/heads/master 1d9d2637f -> 19ae13a4c
Added camel-juel docs to Gitbook Project: http://git-wip-us.apache.org/repos/asf/camel/repo Commit: http://git-wip-us.apache.org/repos/asf/camel/commit/19ae13a4 Tree: http://git-wip-us.apache.org/repos/asf/camel/tree/19ae13a4 Diff: http://git-wip-us.apache.org/repos/asf/camel/diff/19ae13a4 Branch: refs/heads/master Commit: 19ae13a4cd6a134828560dbf277c6c9a1b519ec4 Parents: 1d9d263 Author: Andrea Cosentino <anco...@gmail.com> Authored: Tue May 3 08:39:05 2016 +0200 Committer: Andrea Cosentino <anco...@gmail.com> Committed: Tue May 3 08:39:17 2016 +0200 ---------------------------------------------------------------------- components/camel-juel/src/main/docs/juel.adoc | 93 ++++++++++++++++++++++ docs/user-manual/en/SUMMARY.md | 1 + 2 files changed, 94 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/camel/blob/19ae13a4/components/camel-juel/src/main/docs/juel.adoc ---------------------------------------------------------------------- diff --git a/components/camel-juel/src/main/docs/juel.adoc b/components/camel-juel/src/main/docs/juel.adoc new file mode 100644 index 0000000..e79b29f --- /dev/null +++ b/components/camel-juel/src/main/docs/juel.adoc @@ -0,0 +1,93 @@ +[[EL-EL]] +EL +~~ + +Camel supports the unified JSP and JSF Expression Language via the +http://juel.sourceforge.net/[JUEL] to allow an +link:expression.html[Expression] or link:predicate.html[Predicate] to be +used in the link:dsl.html[DSL] or link:xml-configuration.html[Xml +Configuration]. + +For example you could use EL inside a link:message-filter.html[Message +Filter] in XML + +[source,xml] +--------------------------------------- +<route> + <from uri="seda:foo"/> + <filter> + <el>${in.headers.foo == 'bar'}</el> + <to uri="seda:bar"/> + </filter> +</route> +--------------------------------------- + +You could also use slightly different syntax, e.g. if the header name is +not a valid identifier: + +[source,xml] +------------------------------------------------ +<route> + <from uri="seda:foo"/> + <filter> + <el>${in.headers['My Header'] == 'bar'}</el> + <to uri="seda:bar"/> + </filter> +</route> +------------------------------------------------ + +You could use EL to create an link:predicate.html[Predicate] in a +link:message-filter.html[Message Filter] or as an +link:expression.html[Expression] for a +link:recipient-list.html[Recipient List] + +[[EL-Variables]] +Variables +^^^^^^^^^ + +[width="100%",cols="10%,10%,80%",options="header",] +|======================================================================= +|Variable |Type |Description + +|exchange |Exchange |the Exchange object + +|in |Message |the exchange.in message + +|out |Message |the exchange.out message +|======================================================================= + +[[EL-Samples]] +Samples +^^^^^^^ + +You can use EL dot notation to invoke operations. If you for instance +have a body that contains a POJO that has a `getFamiliyName` method then +you can construct the syntax as follows: + +[source,java] +----------------------- +"${in.body.familyName}" +----------------------- + +[[EL-Dependencies]] +Dependencies +^^^^^^^^^^^^ + +To use EL in your camel routes you need to add the a dependency on +*camel-juel* which implements the EL language. + +If you use maven you could just add the following to your pom.xml, +substituting the version number for the latest & greatest release (see +link:download.html[the download page for the latest versions]). + +[source,java] +------------------------------------- +<dependency> + <groupId>org.apache.camel</groupId> + <artifactId>camel-juel</artifactId> + <version>x.x.x</version> +</dependency> +------------------------------------- + +Otherwise you'll also need to include +http://repo2.maven.org/maven2/de/odysseus/juel/juel/2.1.3/juel-2.1.3.jar[JUEL]. http://git-wip-us.apache.org/repos/asf/camel/blob/19ae13a4/docs/user-manual/en/SUMMARY.md ---------------------------------------------------------------------- diff --git a/docs/user-manual/en/SUMMARY.md b/docs/user-manual/en/SUMMARY.md index 7a7b8df..636cd25 100644 --- a/docs/user-manual/en/SUMMARY.md +++ b/docs/user-manual/en/SUMMARY.md @@ -195,6 +195,7 @@ * [Expession Languages](languages.adoc) * [Bean Language](bean-language.adoc) * [Constant](constant.adoc) + * [EL](juel.adoc) * [Jsonpath](jsonpath.adoc) * [SQL](josql.adoc)
