How to configure RepositoryConfig so that It can take variables like {repo.home} from my custom Properties variable instead of System properties

[Chirag . Jakharia]

How to configure RepositoryConfig so that It can take variables like 
{repo.home} from my custom Properties variablerather tahn System 
properties

I have a component based on Jackrabbit and require it to connect to 
different database and therefore want the runtime change of the Properties 
such as repo.home and such variables and therefore require to pass the 
Properties file but can't find any method relating to that

Thanks in advance

CSJakharia