EMF Compare Editor Investigation

This page is for anyone to contribute notes on how to get EMF Compare working with Rodin Files

An extension to add a file association to EMF Compare for *.bum and *.buc files

(Doing this breaks the Rodin DB getRodinFile(Name) operations because it thinks files with these extensions are no longer Rodin files)

  <extension
        point="org.eclipse.core.runtime.contentTypes">
     <file-association
           content-type="org.eclipse.emf.compare.ui.contenttype.ModelContentType"
           file-extensions="bum,buc">
     </file-association>
  </extension>

Colin's Notes

1. you need to make a file association with *.bum to the EMF compare editor. (you can do this in preferences but it is better to do it by a content type extension)
2. doing this does not work because the text compare editor opens in preference (I think this is because Rodin content type is based on XML - not XMI which is the EMF content type)
3. the new file association breaks the RodinDB getRodinFile operation because this operation sees the wrong file association and regards it as a non-rodin file (hence the new component wizard reports an invalid name)
4. I have tried to alter the priorities in the content type extensions (rodin core, eventb core etc) but this did not seem to work
5. I tried to alter the descriptors in the content type extensions to break the link to XML - I added a new descriptor that detects the root element of a machine file - but this just breaks the RodinDB again because it can't get the content type its expecting (hence the editor raises a null pointer exception because the rodin file is returned as null) -> it appears to get the EMF compare one (good!) but the EMF compare editor still didn't open.