Loading arbitrary objects

[Mark]

If I wanted to load arbitrary objects into some tuples what classes 
should I be looking at? Would I need some of storage class?

For example I have data file with out that contains 
org.apache.mahout.fpm.pfpgrowth.convertors.string.TopKStringPatterns. I 
would like to iterate over them using pig using something like:

rows = LOAD 'data' using TopKStringPatternsStorage();

Is this correct? Is there any wiki on creating storages? Is there 
anything I should look out for?

Thanks for the pointers