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Chapter 7. 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 7.1, “Adding the camel-script dependency”.

Example 7.1. Adding the camel-script dependency

<!-- Maven POM File -->
<properties>
  <camel-version>2.10.0.redhat-60024</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.camel.script.ScriptBuilder.*;
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Built-in attributes
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Table 7.1, “JavaScript attributes” lists the built-in attributes that are accessible when using JavaScript.
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Table 7.1. JavaScript attributes
AttributeTypeValue
contextorg.apache.camel.CamelContextThe Camel Context
exchangeorg.apache.camel.ExchangeThe current Exchange
requestorg.apache.camel.MessageThe IN message
responseorg.apache.camel.MessageThe OUT message
propertiesorg.apache.camel.builder.script.PropertiesFunctionFunction 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 7.2, “Route using JavaScript” shows a route that uses JavaScript.

Example 7.2. 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 chapter "Properties" in "EIP Component Reference".
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