Chapter 37. Flatpack
Flatpack Component
The Flatpack component supports fixed width and delimited file parsing using the FlatPack library. Notice: This component only supports consuming from flatpack files to Object model. You can not (yet) write from Object model to flatpack format.
Maven users will need to add the following dependency to their
pom.xml
for this component:
<dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-flatpack</artifactId> <version>x.x.x</version> <!-- use the same version as your Camel core version --> </dependency>
URI format
flatpack:[delim|fixed]:flatPackConfig.pzmap.xml[?options]
Or for a delimited file handler with no configuration file just use:
flatpack:someName[?options]
You can append query options to the URI in the following format,
?option=value&option=value&...
URI Options
Name | Default Value | Description |
---|---|---|
delimiter
|
,
|
The default character delimiter for delimited files. |
textQualifier
|
"
|
The text qualifier for delimited files. |
ignoreFirstRecord
|
true
|
Whether the first line is ignored for delimited files (for the column headers). |
splitRows
|
true
|
As of Apache Camel 1.5, the component can either process each row one by one or the entire content at once. |
allowShortLines
|
false
|
*Camel 2.9.3:* Allows for lines to be shorter than expected and ignores the extra characters. |
ignoreExtraColumns
|
false
|
*Camel 2.9.3:* Allows for lines to be longer than expected and ignores the extra characters. |
Examples
flatpack:fixed:foo.pzmap.xml
creates a fixed-width endpoint using thefoo.pzmap.xml
file configuration.flatpack:delim:bar.pzmap.xml
creates a delimited endpoint using thebar.pzmap.xml
file configuration.flatpack:foo
creates a delimited endpoint calledfoo
with no file configuration.
Message Headers
Apache Camel will store the following headers on the IN message:
Header | Description |
---|---|
camelFlatpackCounter
|
The current row index. For splitRows=false the counter is the total number of rows.
|
Message Body
The component delivers the data in the IN message as a
org.apache.camel.component.flatpack.DataSetList
object that has converters for java.util.Map
or java.util.List
. Usually you want the Map
if you process one row at a time (splitRows=true
). Use List
for the entire content (splitRows=false
), where each element in the list is a Map
. Each Map
contains the key for the column name and its corresponding value.
For example to get the firstname from the sample below:
Map row = exchange.getIn().getBody(Map.class); String firstName = row.get("FIRSTNAME");
However, you can also always get it as a
List
(even for splitRows=true
). The same example:
List data = exchange.getIn().getBody(List.class); Map row = (Map)data.get(0); String firstName = row.get("FIRSTNAME");
Header and Trailer records
The header and trailer notions in Flatpack are supported. However, you must use fixed record IDs:
header
for the header record (must be lowercase)trailer
for the trailer record (must be lowercase)
The example below illustrates this fact that we have a header and a trailer. You can omit one or both of them if not needed.
<RECORD id="header" startPosition="1" endPosition="3" indicator="HBT"> <COLUMN name="INDICATOR" length="3"/> <COLUMN name="DATE" length="8"/> </RECORD> <COLUMN name="FIRSTNAME" length="35" /> <COLUMN name="LASTNAME" length="35" /> <COLUMN name="ADDRESS" length="100" /> <COLUMN name="CITY" length="100" /> <COLUMN name="STATE" length="2" /> <COLUMN name="ZIP" length="5" /> <RECORD id="trailer" startPosition="1" endPosition="3" indicator="FBT"> <COLUMN name="INDICATOR" length="3"/> <COLUMN name="STATUS" length="7"/> </RECORD>
Using the endpoint
A common use case is sending a file to this endpoint for further processing in a separate route. For example:
<camelContext xmlns="http://activemq.apache.org/camel/schema/spring"> <route> <from uri="file://someDirectory"/> <to uri="flatpack:foo"/> </route> <route> <from uri="flatpack:foo"/> ... </route> </camelContext>
You can also convert the payload of each message created to a
Map
for easy Bean Integration