The original code was written in Matlab that is a Sentiment Analysis. Due to the strong interest in this work we decided to re-write the entire algorithm in Java for easier and more scalable use, and without requiring a Matlab license.
The current model is integrated into Stanford CoreNLP as of version 3.3.0 or later and is available here. This includes the model and the source code, as well as the parser and sentence splitter needed to use the sentiment tool.