Java API : ChangeSummaryNode and ChangeSetNode

I am using Java API in order to retrieve information from the client about incoming change-sets. I am using com.ibm.team.filesystem.rcp.core.internal.changes.model.IComponentSyncModel to retrieve the information. The main purpose is to save on server hits and use the information stored in the client. I found the class ChangeSummaryNode which stores information for each file in the change-set. It has the two functions getBeforePath and getAfterPath which give the path to the file before and after the change. However, it is not a full path.I think it is missing the path to the component.

How do I build the path of the component, using the information in IComponentSyncModel ? (Or other services ?)

If the change was re-parented, how do I find the path of the source component ?

Thanks :-)