Flatpack

Since Camel 2.1

The Flatpack component ships with the Flatpack data format that can be used to format between fixed width or delimited text messages to a List of rows as Map.

  • marshal = from List<Map<String, Object>> to OutputStream (can be converted to String)

  • unmarshal = from java.io.InputStream (such as a File or String) to a java.util.List as an org.apache.camel.component.flatpack.DataSetList instance.

     The result of the operation will contain all the data. If you need to
process each row one by one you can split the exchange, using
Splitter.

Notice: The Flatpack library does currently not support header and trailers for the marshal operation.

Options

The Flatpack dataformat supports 9 options, which are listed below.

Name Default Java Type Description

definition

String

The flatpack pzmap configuration file. Can be omitted in simpler situations, but its preferred to use the pzmap.

fixed

false

Boolean

Delimited or fixed. Is by default false = delimited

ignoreFirstRecord

true

Boolean

Whether the first line is ignored for delimited files (for the column headers). Is by default true.

textQualifier

String

If the text is qualified with a character. Uses quote character by default.

delimiter

,

String

The delimiter char (could be ; , or similar)

allowShortLines

false

Boolean

Allows for lines to be shorter than expected and ignores the extra characters

ignoreExtraColumns

false

Boolean

Allows for lines to be longer than expected and ignores the extra characters.

parserFactoryRef

String

References to a custom parser factory to lookup in the registry

contentTypeHeader

false

Boolean

Whether the data format should set the Content-Type header with the type from the data format if the data format is capable of doing so. For example application/xml for data formats marshalling to XML, or application/json for data formats marshalling to JSon etc.

Spring Boot Auto-Configuration

When using Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-flatpack-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>

The component supports 12 options, which are listed below.

Name Description Default Type

camel.component.flatpack.enabled

Enable flatpack component

true

Boolean

camel.component.flatpack.resolve-property-placeholders

Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders.

true

Boolean

camel.dataformat.flatpack.allow-short-lines

Allows for lines to be shorter than expected and ignores the extra characters

false

Boolean

camel.dataformat.flatpack.content-type-header

Whether the data format should set the Content-Type header with the type from the data format if the data format is capable of doing so. For example application/xml for data formats marshalling to XML, or application/json for data formats marshalling to JSon etc.

false

Boolean

camel.dataformat.flatpack.definition

The flatpack pzmap configuration file. Can be omitted in simpler situations, but its preferred to use the pzmap.

String

camel.dataformat.flatpack.delimiter

The delimiter char (could be ; , or similar)

,

String

camel.dataformat.flatpack.enabled

Enable flatpack dataformat

true

Boolean

camel.dataformat.flatpack.fixed

Delimited or fixed. Is by default false = delimited

false

Boolean

camel.dataformat.flatpack.ignore-extra-columns

Allows for lines to be longer than expected and ignores the extra characters.

false

Boolean

camel.dataformat.flatpack.ignore-first-record

Whether the first line is ignored for delimited files (for the column headers). Is by default true.

true

Boolean

camel.dataformat.flatpack.parser-factory-ref

References to a custom parser factory to lookup in the registry

String

camel.dataformat.flatpack.text-qualifier

If the text is qualified with a character. Uses quote character by default.

String

ND

Usage

To use the data format, simply instantiate an instance and invoke the marshal or unmarshal operation in the route builder:

  FlatpackDataFormat fp = new FlatpackDataFormat();
  fp.setDefinition(new ClassPathResource("INVENTORY-Delimited.pzmap.xml"));
  ...
  from("file:order/in").unmarshal(df).to("seda:queue:neworder");

The sample above will read files from the order/in folder and unmarshal the input using the Flatpack configuration file INVENTORY-Delimited.pzmap.xml that configures the structure of the files. The result is a DataSetList object we store on the SEDA queue.

FlatpackDataFormat df = new FlatpackDataFormat();
df.setDefinition(new ClassPathResource("PEOPLE-FixedLength.pzmap.xml"));
df.setFixed(true);
df.setIgnoreFirstRecord(false);

from("seda:people").marshal(df).convertBodyTo(String.class).to("jms:queue:people");

In the code above we marshal the data from a Object representation as a List of rows as Maps. The rows as Map contains the column name as the key, and the corresponding value. This structure can be created in Java code from e.g. a processor. We marshal the data according to the Flatpack format and convert the result as a String object and store it on a JMS queue.

Dependencies

To use Flatpack in your camel routes you need to add the a dependency on camel-flatpack which implements this data format.

If you use maven you could 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-flatpack</artifactId>
  <version>x.x.x</version>
</dependency>
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