OGNL
Camel allows OGNL to be used as an Expression or Predicate the DSL or Xml Configuration.
You could use OGNL to create an Predicate in a Message Filter or as an Expression for a Recipient List
You can use OGNL 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:
"request.body.familyName" // or "getRequest().getBody().getFamilyName()"
Variables
| Variable | Type | Description |
|---|---|---|
| this | Exchange | the Exchange is the root object |
| exchange | Exchange | the Exchange object |
| exception | Throwable | the Exchange exception (if any) |
| exchangeId | String | the exchange id |
| fault | Message | the Fault message (if any) |
| request | Message | the exchange.in message |
| response | Message | the exchange.out message (if any) |
| properties | Map | the exchange properties |
| property(name) | Object | the property by the given name |
| property(name, type) | Type | the property by the given name as the given type |
Samples
For example you could use OGNL inside a Message Filter in XML
<route>
<from uri="seda:foo"/>
<filter>
<ognl>request.headers.foo == 'bar'</ognl>
<to uri="seda:bar"/>
</filter>
</route>
And the sample using Java DSL:
from("seda:foo").filter().ognl("request.headers.foo == 'bar'").to("seda:bar");
Dependencies
To use OGNL in your camel routes you need to add the a dependency on camel-ognl which implements the OGNL 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 the download page for the latest versions).
<dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-ognl</artifactId> <version>1.4.0</version> </dependency>
Otherwise, you'll also need OGNL