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  1. FAQ 319: What is eScript?
  2. FAQ 320: Language integration phase 1: How do I compile and build programs?
  3. FAQ 321: How do I load source files edited outside Eclipse?
  4. FAQ 322: How do I run an external builder on my source files?
  5. FAQ 323: How do I implement a compiler that runs inside Eclipse?
  6. FAQ 324: How do I react to changes in source files?
  7. FAQ 325: How do I implement an Eclipse builder?
  8. FAQ 326: Where are project build specifications stored?
  9. FAQ 327: How do I add a builder to a given project?
  10. FAQ 328: How do I implement an incremental project builder?
  11. FAQ 329: How do I handle setup problems for a given builder?
  12. FAQ 330: How do I make my compiler incremental?
  13. FAQ 331: Language integration phase 2: How do I implement a DOM?
  14. FAQ 332: How do I implement a DOM for my language?
  15. FAQ 333: How can I ensure that my model is scalable?
  16. FAQ 334: Language integration phase 3: How do I edit programs?
  17. FAQ 335: How do I write an editor for my own language?
  18. FAQ 336: How do I add Content Assist to my language editor?
  19. FAQ 337: How do I add hover support to my text editor?
  20. FAQ 338: How do I create problem markers for my compiler?
  21. FAQ 339: How do I implement Quick Fixes for my own language?
  22. FAQ 340: How do I support refactoring for my own language?
  23. FAQ 341: How do I create an Outline view for my own language editor?
  24. FAQ 342: Language integration phase 4: What are the finishing touches?
  25. FAQ 343: What wizards do I define for my own language?
  26. FAQ 344: When does my language need its own nature?
  27. FAQ 345: When does my language need its own perspective?
  28. FAQ 346: How do I add documentation and help for my own language?
  29. FAQ 347: How do I support source-level debugging for my own language?
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This chapter is from the book

This chapter is from the book

FAQ 324: How do I react to changes in source files?

Register a workspace resource change listener. Inside our eScript plug-in class, we call

IResourceChangeListener rcl = new IResourceChangeListener() {
   public void resourceChanged(IResourceChangeEvent event) {
      IResource resource = event.getResource();
      if (resource.getFileExtension().equals("escript" )) {
         // run the compiler

We will be notified whenever the file is changed in the workspace under Eclipse’s control. Changes made to the files outside Eclipse will not be detected unless the workspace is being explicitly refreshed. Alternatively, a separate worker thread could be used to monitor the file system and inform Eclipse of any files having changed.

If the source files are edited with an Eclipse text editor, this scenario will work, and files can be compiled as soon as saved. We certainly are on the right path for our language integration because all editing and compilation are done inside Eclipse on the same Java VM.

Even though we are more integrated than when running an external builder, reacting to workspace changes remains cumbersome, and a much better approach is to use an integrated builder.


eclipse.org article “How You’ve Changed! Responding to resource changes in the Eclipse workspace”
Go to Platform Plug-in Developer Guide > Programmer’s Guide > Resources overview > Tracking resource changes

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