Chapter 7. ASN.1 File DataFormat

The ASN.1 File dataformat supports 3 options, which are listed below.

The component supports 4 options, which are listed below.

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There are 3 different ways to unmarshal ASN.1 structured messages. (Usually binary files)

In this first example we unmarshal BER file payload to OutputStream and send it to mock endpoint.

from("direct:unmarshal").unmarshal(asn1).to("mock:unmarshal");

In the second example we unmarshal BER file payload to byte array using Split EIP. The reason for applying Split EIP is that usually each BER file or (ASN.1 structured file) contains multiple records to process and Split EIP helps us to get each record in a file as byte arrays which is actually ASN1Primitive’s instance (by the use of Bouncy Castle’s ASN.1 support in bcprov-jdk18on library) Byte arrays then may be converted to ASN1Primitive by the help of public static method in (ASN1Primitive.fromByteArray) In such example, note that you need to set usingIterator=true

from("direct:unmarshal").unmarshal(asn1).split(body(Iterator.class)).streaming().to("mock:unmarshal");

In the last example we unmarshal BER file payload to plain old Java Objects using Split EIP. The reason for applying Split EIP is already mentioned in the previous example. Please note and keep in mind that reason. In such example we also need to set the fully qualified name of the class or <YourObject>.class reference through data format. The important thing to note here is that your object should have been generated by jasn1 compiler which is a nice tool to generate java object representations of your ASN.1 structure. For the reference usage of jasn1 compiler see [JASN.1 Project Page](https://www.openmuc.org/asn1/) and please also see how the compiler is invoked with the help of maven’s exec plugin. For example, in this data format’s unit tests an example ASN.1 structure(TestSMSBerCdr.asn1) is added in src/test/resources/asn1_structure. jasn1 compiler is invoked and java object’s representations are generated in ${basedir}/target/generated/src/test/java The nice thing about this example, you will get POJO instance at the mock endpoint or at whatever your endpoint is.

from("direct:unmarshaldsl")
         .unmarshal()
         .asn1("org.apache.camel.dataformat.asn1.model.testsmscbercdr.SmsCdr")
         .split(body(Iterator.class)).streaming()
.to("mock:unmarshaldsl");

To use ASN.1 data format in your camel routes you need to add a dependency on camel-asn1 which implements this data format.

If you use Maven you can 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-asn1</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>