Jython Functions

[mj.ke...@gmail.com]

Hello,

Is there a way to define a bunch of custom Jython functions that could be used in my transformations rather than having to write the same code repeatedly in my transformations?

Thanks,

--mjk

[John Little]

You can look in the "History" Tab.  Inside the expression box, you should find previous jython expressions that you've written.  Then click 'reuse'.  Or, you can star the expression and retrieve starred expressions from the "Starred" tab.

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[Ettore Rizza]

Hi,

You can define a series of functions in a .py file, then use the sys module to add to the path the folder where your file is located. Here is an example with a file named myFunctions.py containing the addOne() function and stored on my desktop. 

I've proposed to find a simpler system, for example making OpenRefine automatically import the path of a folder where Python modules could be stored, but the proposal was classified as "priority Low". You can support it if you wish.

Ettore

[Ettore Rizza]

Erratum: I had completely forgotten that Thad had provided an answer to this question. In fact, just store the file containing your functions in the folder .\openrefine-3.0-rc.1\webapp\extensions\jython\module\MOD-INF\lib.

After that, you can import the file as a module. 

[mj.ke...@gmail.com]

We are still using 2.8.  Does this work in 2.8:  webapp/extensions/jython/module/MOD-INF/lib?

Couple more questions:

> If I add modules to the directory at runtime, that is AFTER the instance has started up, will OR pick up on the newly added Python libs?

> I can add *.py files to this directory?  Or do they need to be compiled and packaged as a JAR file?

Thanks.

[mj.ke...@gmail.com]

Looks like answer is yes to all.  I just checked locally.

--mjk

[Ettore Rizza]

Hi,

I've not tested with 2.8, but I do not see why the trick would not work. Nothing has changed on that side. The best is to test yourself with a small function like the one I used. This is a simple text file with a .py extension.

However, you need to restart OpenRefine if you add new functions to the folder when OR is running.