A Human Readable Predicate with ObjectLab Kit

Recently, I have been working with Predicates.

I'm modelling some stuff for a bank but I needed to present updates and changes to the handwritten rules regularly. I don't know about you but wouldn't be nice if we could print the Predicate and not getting something like:

net.objectlab.kit.util.excel.ExcelWorkbookTest$$Lambda$1/868693306@13221655

Therefore, here comes the PrintablePredicate class in the next release of ObjectLab Kit.

See PrintablePredicate.java

The idea is to create an implementation of a Predicate and allow you to give it a name and the values it is comparing against.  We also support AND, OR and NEGATE as per a Predicate.

Let's imagine a small model, a financial Instrument 'Asset' and some basic Predicates.  Imagine that we create a predicate that detects instruments that are either Bonds or Commodities but that they should also be Active.

Using PrintablePredicate, I can combine 2 predicates and when I print the predicate (in an Excel spreadsheet that I generate automatically, more on that later) I can see a nice string "AssetClass in (Bond, Commodities) AND Active".  Here is the code for it:



This tiny class will come with ObjectLab Kit 1.4.1. Enjoy!