Want to add some stream networks on it, but don't know how to parse geodata

[forpicnic]

Hi Benedikt,
The Sea-Level-Explorer by Processing is pretty cool! I want to add some stream networks on it, and I found data on http://hydrosheds.org/. I downloaded and found it is a coverage(.adf) data. I don't know how to parse ESRI shapefiles in Processing, let alone the coverage(.adf) ones. I noticed that you load SRTM in source code, I read it several times and don't know how can you make it.

Do you have any ideas about parsing coverage(.adf) data?
Thank you!!!

P.S. coverage(.adf) from HydroSHEDS is based on high-resolution elevation data obtained during a Space Shuttle flight for NASA's Shuttle Radar Topography Mission (SRTM).