[CONF] Apache Camel: JXPath (page edited)

Sat, 20 Sep 2008 01:01:06 -0700

Page Edited : CAMEL : JXPath

JXPath has been edited by Claus Ibsen (Sep 20, 2008).

(View changes)

Content:

JXPath

Camel supports JXPath to allow XPath expressions to be used on beans in an _expression_ or Predicate to be used in the DSL or Xml Configuration. For example you could use JXPath to create an Predicate in a Message Filter or as an _expression_ for a Recipient List.

From 1.3 of Camel onwards you can use XPath expressions directly using smart completion in your IDE as follows

from("queue:foo").filter().
  jxpath("/in/body/foo").
  to("queue:bar")


Syntax






 _expression_ 
 Type 
 Description 




 this 
 Exchange 
 the Exchange object 




 in 
 Message 
 the exchange.in message 




 out 
 Message 
 the exchange.out message 






Using XML configuration



If you prefer to configure your routes in your Spring XML file then you can use JXPath expressions as follows





<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://activemq.apache.org/camel/schema/spring http://activemq.apache.org/camel/schema/spring/camel-spring.xsd">

  <camelContext id="camel" xmlns="http://activemq.apache.org/camel/schema/spring">
    <route>
      <from uri="activemq:MyQueue"/>
      <filter>
        <jxpath>in/body/name = 'James'</xpath>
        <to uri="mqseries:SomeOtherQueue"/>
      </filter>
    </route>
  </camelContext>
</beans>





Examples



Here is a simple example using a JXPath _expression_ as a predicate in a Message Filter





from("direct:start").
        filter().jxpath("in/body/name='James'").
        to("mock:result");





JXPath injection 



You can use Bean Integration to invoke a method on a bean and use various languages such as JXPath to extract a value from the message and bind it to a method parameter.



For example





public class Foo {
	
    @MessageDriven(uri = "activemq:my.queue")
    public void doSomething(@JXPath("in/body/foo") String correlationID, @Body String body) {
		// process the inbound message here
    }
}





Dependencies



To use JXpath in your camel routes you need to add the a dependency on camel-jxpath which implements the JXpath 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-jxpath</artifactId>
  <version>1.4.0</version>
</dependency>

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