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Chapter 19. JavaScript

Overview
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JavaScript, also known as ECMAScript is a Java-based scripting language that allows quick parsing of object. The JavaScript support is part of the camel-script module.

Adding the script module
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To use JavaScript in your routes you need to add a dependency on camel-script to your project as shown in Example 19.1, “Adding the camel-script dependency”.

Example 19.1. Adding the camel-script dependency

<!-- Maven POM File -->
<properties>
  <camel-version>2.21.0.fuse-770013-redhat-00001</camel-version>
  ...
</properties>

<dependencies>
  ...
  <dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-script</artifactId>
    <version>${camel-version}</version>
  </dependency>
  ...
</dependencies>
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Static import
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To use the javaScript() static method in your application code, include the following import statement in your Java source files: 

import static org.apache.camel.builder.script.ScriptBuilder.*;
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Built-in attributes
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Table 19.1, “JavaScript attributes” lists the built-in attributes that are accessible when using JavaScript.

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Table 19.1. JavaScript attributes
AttributeTypeValue

context

org.apache.camel.CamelContext

The Camel Context

exchange

org.apache.camel.Exchange

The current Exchange

request

org.apache.camel.Message

The IN message

response

org.apache.camel.Message

The OUT message

properties

org.apache.camel.builder.script.PropertiesFunction

Function with a resolve method to make it easier to use the properties component inside scripts.

The attributes all set at ENGINE_SCOPE.

Example
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Example 19.2, “Route using JavaScript” shows a route that uses JavaScript.

Example 19.2. Route using JavaScript

<camelContext>
  <route>
    <from uri="direct:start"/>
    <choice>
      <when>
        <langauge langauge="javaScript">request.headers.get('user') == 'admin'</langauge>
        <to uri="seda:adminQueue"/>
      </when>
      <otherwise>
        <to uri="seda:regularQueue"/>
      </otherwise>
    </choice>
  </route>
</camelContext>
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Using the properties component
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To access a property value from the properties component, invoke the resolve method on the built-in properties attribute, as follows: 

.setHeader("myHeader").javaScript("properties.resolve(PropKey)")
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Where PropKey is the key of the property you want to resolve, where the key value is of String type.

For more details about the properties component, see Properties in the Apache Camel Component Reference Guide.

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