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Custom DataFormat

You can use your custom Data Format implementation with Camel. All you have to do is to implement the DataFormat interface. For example in the following we will implement a reverse data format as shown below:

Error formatting macro: snippet: java.lang.IndexOutOfBoundsException: Index: 20, Size: 20

And to use it in Java DSL:

Error formatting macro: snippet: java.lang.IndexOutOfBoundsException: Index: 20, Size: 20

Notice we use custom to refer to the Data Format in the Registry. In Java DSL you can also provide the instance directly as shown:

from("direct:a")
    .marshal(new MyReverseDataFormat())
    .to("mock:a");

And likewise to use it in XML DSL:

Error rendering macro 'code': Invalid value specified for parameter 'java.lang.NullPointerException'
<!-- this is our custom data format implementation -->
<bean id="reverse" class="org.apache.camel.impl.RefDataFormatTest$MyReverseDataFormat"/>

<camelContext xmlns="http://camel.apache.org/schema/spring">
  <route>
    <from uri="direct:a"/>
    <marshal>
      <!-- refer to my custom data format -->
      <custom ref="reverse"/>
    </marshal>
    <to uri="mock:a"/>
  </route>

  <route>
    <from uri="direct:b"/>
    <unmarshal>
      <!-- refer to my custom data format -->
      <custom ref="reverse"/>
    </unmarshal>
    <to uri="mock:b"/>
  </route>
</camelContext>

Notice in the XML DSL example above we use <custom> to refer to a custom data format. This requires Camel 2.8 or better. In older releases you would have to use the ref attribute as shown below. Notice the ref attribute has been @deprecated and you should prefer to use the <custom> way:

 <marshal ref="reverse"/>
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