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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 328: How do I implement an incremental project builder?

To implement an incremental project builder, you first have to create an extension for org.eclipse.core.resources.builders:

      name="eScript Builder"
      point="org.eclipse.core.resources.builders" >
      <run class="org.eclipse.escript.builder.Builder" >
         <parameter name="optimize"  value="true" />
         <parameter name="comment"  value="escript Builder" />

The second step is to create a builder class that must extend the abstract IncrementalProjectBuilder superclass:

public class Builder extends IncrementalProjectBuilder {
   protected IProject[] build(int kind, Map args,
    IProgressMonitor monitor) {
      if (kind == IncrementalProjectBuilder.FULL_BUILD) {
      } else {
         IResourceDelta delta = getDelta(getProject());
         if (delta == null) {
         } else {
            incrementalBuild(delta, monitor);
      return null;
   private void incrementalBuild(IResourceDelta delta,
    IProgressMonitor monitor) {
      System.out.println("incremental build on " +delta);
        try {
           delta.accept(new IResourceDeltaVisitor() {
              public boolean visit(IResourceDelta delta) {
                 System.out.println("changed: "+
                 return true; // visit children too
        } catch (CoreException e) {
   private void fullBuild(IProgressMonitor monitor) {
      System.out.println("full build");

It is important to return true in the visit method for those folders that contain the resources of interest. If you return false, the children of the resource delta are not visited.


FAQ 329 How do I handle setup problems for a given builder?

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