Getting a change set for a stream and baseline with plain Java

Hi,

I'm trying to get all change sets for a specific component baseline in a defined stream, but I found no way to to it.

What I want to do:

• Going through a project area
• Get all streams (with some conditions...) and do for each stream:
• Find a defined component inside this stream. If found ->
  
• Get all baselines of the component and do for each baselines:
• Look, if there is a specific change set in the baseline

I'm able to get all change sets for a component baseline, but then I've no idea, in which stream it is.
I'm able to get all change sets for a stream, but then I've no reference to the baseline.

For both I took the setContext function, but I suspect, that I can't use it two times, if I do it in the way below, the program only takes the last setContext criteria:

IChangeSetSearchCriteria changeSetSearchCriteria = IChangeSetSearchCriteria.FACTORY.newInstance();
                                            changeSetSearchCriteria.setComponent(comps.get(j));   
                                           
                                            changeSetSearchCriteria.setContext(streamHandle);
                                            changeSetSearchCriteria.setContext(baselineHandle);
                                                                                       
                                            List<IChangeSetHandle> changeSetHandles = wm.findChangeSets(changeSetSearchCriteria,  IWorkspaceManager.MAX_QUERY_SIZE, null);

Do you have an idea, how to solve it?

Thanks in advance,
Lars