title: Eclipse API: How to get IFile from an IProject using only the file name?
body: <p>As stated in the title, I do <strong>not</strong> have the package names or information. I have a handle to the IProject and a String representing the name of the IFile.</p>
  
  <p>The IFile is a <code>.java</code> class file, and the IProject is a Java project. Ideally, I would like to do this without assuming they are Java files/projects - but the assumption is okay for my purposes. Any suggestions?</p>