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Chapter 27. Ref
Overview
The Ref expression language is really just a way to look up a custom Expression from the Registry. This is particular convenient to use in the XML DSL.
The Ref language is part of
camel-core.
Static import
To use the Ref language in your Java application code, include the following import statement in your Java source files:
import static org.apache.camel.language.simple.RefLanguage.ref;
XML example
For example, the splitter pattern can reference a custom expression using the Ref language, as follows:
<beans ...> <bean id="myExpression" class="com.mycompany.MyCustomExpression"/> ... <camelContext> <route> <from uri="seda:a"/> <split> <ref>myExpression</ref> <to uri="mock:b"/> </split> </route> </camelContext> </beans>
Java example
The preceding route can also be implemented in the Java DSL, as follows:
from("seda:a")
.split().ref("myExpression")
.to("seda:b");