title: Eclipse rename/refactoring override
body: <p>I am new to eclipse plug-in development. I want to customize the renaming of a project. I need to validate the new name. So how can I override eclipse's rename/refactoring method?</p>
  
  <p>I saw something related to RenameParticipant, but didn't understand clearly. It would be great if someone could explain me steps to override the renaming functionality.</p>
  
  <p>Many Thanks,
  Ann</p>