Chapter 24. The Object-Graph Navigation Language(OGNL)

Overview
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OGNL is an expression language for getting and setting properties of Java objects. You use the same expression for both getting and setting the value of a property. The OGNL support is in the camel-ognl module.

Camel on EAP deployment
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This component is supported by the Camel on EAP (Wildfly Camel) framework, which offers a simplified deployment model on the Red Hat JBoss Enterprise Application Platform (JBoss EAP) container.

Adding the OGNL module
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To use OGNL in your routes you need to add a dependency on camel-ognl to your project as shown in Example 24.1, “Adding the camel-ognl dependency”.

Example 24.1. Adding the camel-ognl dependency

<!-- Maven POM File -->
...
<dependencies>
  ...
  <dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-ognl</artifactId>
    <version>${camel-version}</version>
  </dependency>
  ...
</dependencies>

<!-- Maven POM File -->
...
<dependencies>
  ...
  <dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-ognl</artifactId>
    <version>${camel-version}</version>
  </dependency>
  ...
</dependencies>

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Static import
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To use the ognl() static method in your application code, include the following import statement in your Java source files:

import static org.apache.camel.language.ognl.OgnlExpression.ognl;

import static org.apache.camel.language.ognl.OgnlExpression.ognl;

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Built-in variables
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Table 24.1, “OGNL variables” lists the built-in variables that are accessible when using OGNL.

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Table 24.1. OGNL variables
Name	Type	Description
`this`	`org.apache.camel.Exchange`	The current Exchange
`exchange`	`org.apache.camel.Exchange`	The current Exchange
`exception`	`Throwable`	the Exchange exception (if any)
`exchangeID`	`String`	the Exchange ID
`fault`	`org.apache.camel.Message`	The Fault message(if any)
`request`	`org.apache.camel.Message`	The IN message
`response`	`org.apache.camel.Message`	The OUT message
`properties`	`Map`	The Exchange properties
`property(name)`	`Object`	The value of the named Exchange property
`property(name, type)`	`Type`	The typed value of the named Exchange property

Example
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Example 24.2, “Route using OGNL” shows a route that uses OGNL.

Example 24.2. Route using OGNL

<camelContext>
  <route>
    <from uri="seda:foo"/>
    <filter>
      <language langauge="ognl">request.headers.foo == 'bar'</language>
      <to uri="seda:bar"/>
    </filter>
  </route>
</camelContext>

<camelContext>
  <route>
    <from uri="seda:foo"/>
    <filter>
      <language langauge="ognl">request.headers.foo == 'bar'</language>
      <to uri="seda:bar"/>
    </filter>
  </route>
</camelContext>

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Overview
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Camel on EAP deployment
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Adding the OGNL module
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Static import
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Built-in variables
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Example
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Chapter 24. The Object-Graph Navigation Language(OGNL)

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Overview
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Camel on EAP deployment
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Adding the OGNL module
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Static import
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Built-in variables
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Example
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