@Override
public boolean canFix(Annotation annotation) {
	if (annotation.isMarkedDeleted())
		return false;

	// non-persisted annotation
	if (annotation instanceof XtextAnnotation) {
		XtextAnnotation a = (XtextAnnotation) annotation;
		return getResolutionProvider().hasResolutionFor(a.getIssueCode());
	}

	// persisted markerAnnotation
	if (annotation instanceof MarkerAnnotation) {
		MarkerAnnotation markerAnnotation = (MarkerAnnotation) annotation;
		if (!markerAnnotation.isQuickFixableStateSet())
			markerAnnotation.setQuickFixable(getResolutionProvider().hasResolutionFor(
					issueUtil.getCode(markerAnnotation)));
		return markerAnnotation.isQuickFixable();
	}

	if (annotation instanceof SpellingAnnotation) {
		return true;
	}

	return false;
}
 

private HoverInfoWithSpellingAnnotation getSpellingHover(ITextViewer textViewer, IRegion hoverRegion) {
    IAnnotationModel model= null;
    if (textViewer instanceof ISourceViewerExtension2) {
        model = ((ISourceViewerExtension2)textViewer).getVisualAnnotationModel();
    } else if (textViewer instanceof SourceViewer) {
        model= ((SourceViewer)textViewer).getAnnotationModel();
    }
    if (model != null) {
        @SuppressWarnings("rawtypes")
        Iterator e= model.getAnnotationIterator();
        while (e.hasNext()) {
            Annotation a= (Annotation) e.next();
            if (a instanceof SpellingAnnotation) {
                Position p= model.getPosition(a);
                if (p != null && p.overlapsWith(hoverRegion.getOffset(), hoverRegion.getLength())) {
                    return new HoverInfoWithSpellingAnnotation((SpellingAnnotation)a, textViewer, p.getOffset());
                }
            }
        }
    }
    return null;
}
 

/**
 * @since 2.3
 */
protected List<ICompletionProposal> createQuickfixes(IQuickAssistInvocationContext invocationContext, Set<Annotation> applicableAnnotations) {
   	List<ICompletionProposal> result = Lists.newArrayList();
   	ISourceViewer sourceViewer = invocationContext.getSourceViewer();
	IAnnotationModel annotationModel = sourceViewer.getAnnotationModel();
	IXtextDocument xtextDocument = xtextDocumentUtil.getXtextDocument(sourceViewer);
   	for(Annotation annotation : applicableAnnotations) {
		if (annotation instanceof SpellingAnnotation) {
			SpellingProblem spellingProblem = ((SpellingAnnotation) annotation).getSpellingProblem();
			ICompletionProposal[] proposals = spellingProblem.getProposals();
			if (proposals != null) {
				result.addAll(asList(proposals));
			}
		} else {
			final Issue issue = issueUtil.getIssueFromAnnotation(annotation);
			Position pos = annotationModel.getPosition(annotation);
			if (issue != null && pos != null) {
				@SuppressWarnings("deprecation")
				Iterable<IssueResolution> resolutions = getResolutions(issue, xtextDocument);
				if (resolutions.iterator().hasNext()) {
					for (IssueResolution resolution : resolutions) {
						result.add(create(pos, resolution));
					}
				}
			}
		}
	}
   	return result;
   }
 

/**
 * Check whether the given annotation type is supported, i.e. {@link #canFix(Annotation)} might return {@code true}.
 * This could be made protected in a future release.
 */
private boolean isSupported(Annotation annotation) {
	return !annotation.isMarkedDeleted()
			&& (annotation instanceof XtextAnnotation || annotation instanceof MarkerAnnotation
				|| annotation instanceof SpellingAnnotation);
}
 

public void accept(SpellingProblem problem) {
    fAddAnnotations.put(new SpellingAnnotation(problem), new Position(problem.getOffset(), problem.getLength()));
}
 

public HoverInfoWithSpellingAnnotation(SpellingAnnotation spellingAnnotation, ITextViewer viewer, int offset) {
    this.fSpellingAnnotation = spellingAnnotation;
    this.fViewer = viewer;
    this.fOffset = offset;
}
 

public void accept(SpellingProblem problem) {
	fAddAnnotations.put(new SpellingAnnotation(problem), new Position(problem.getOffset(), problem.getLength()));
}
 

@Override
public void accept(SpellingProblem problem) {
    fAddAnnotations
            .put(new SpellingAnnotation(problem), new Position(problem.getOffset(), problem.getLength()));
}
 

@Override
public void endCollecting() {

    List<Object> toRemove = new ArrayList<Object>();

    Object fLockObject;
    if (fAnnotationModel instanceof ISynchronizable) {
        fLockObject = ((ISynchronizable) fAnnotationModel).getLockObject();
    } else {
        fLockObject = new Object();
    }

    //let other threads execute before getting the lock on the annotation model
    Thread.yield();

    Thread thread = Thread.currentThread();
    int initiaThreadlPriority = thread.getPriority();
    try {
        //before getting the lock, let's execute with normal priority, to optimize the time that we'll 
        //retain that object locked (the annotation model is used on lots of places, so, retaining the lock
        //on it on a minimum priority thread is not a good thing.
        thread.setPriority(Thread.NORM_PRIORITY);
        Iterator<Annotation> iter;

        synchronized (fLockObject) {
            iter = fAnnotationModel.getAnnotationIterator();
            while (iter.hasNext()) {
                Object n = iter.next();
                if (n instanceof SpellingAnnotation) {
                    toRemove.add(n);
                }
            }
            iter = null;
        }

        Annotation[] annotationsToRemove = toRemove.toArray(new Annotation[toRemove.size()]);

        //let other threads execute before getting the lock (again) on the annotation model
        Thread.yield();
        synchronized (fLockObject) {
            if (fAnnotationModel instanceof IAnnotationModelExtension) {
                ((IAnnotationModelExtension) fAnnotationModel).replaceAnnotations(annotationsToRemove,
                        fAddAnnotations);
            } else {
                for (int i = 0; i < annotationsToRemove.length; i++) {
                    fAnnotationModel.removeAnnotation(annotationsToRemove[i]);
                }
                for (iter = fAddAnnotations.keySet().iterator(); iter.hasNext();) {
                    Annotation annotation = iter.next();
                    fAnnotationModel.addAnnotation(annotation, fAddAnnotations.get(annotation));
                }
            }
        }

    } finally {
        thread.setPriority(initiaThreadlPriority);
    }
    fAddAnnotations = null;
}