Creating custom functions using code routines

Code routines enable the developer to create re-usable Java classes that can be integrated into Talend jobs, and in particular within tMap.

In the validation chapter, there is an example of a simple code routine. This recipe is a fuller explanation of creating and using code routines within Talend.

Getting ready

Open the job jo_cook_ch05_0040_codeRoutine.

How to do it…

1. In the metadata section, open the Code folder and right-click on Routines. Select Create routine.

   

2. Name the routine regexUtilities and click on Finish. This will open a Java package and create a new class called regexUtilities, and a test method called helloExample.

3. Copy the following code immediately after the end of the helloExample method.

       /**
        * regexData: return the first instance of regex pattern in a string.  
        * Returns null if there is no text matching the pattern.
        * e.g. regexData(".*r", "world") # returns "wor"
        * 
        * {talendTypes} String
        * 
      ...