@SuppressWarnings({"unchecked", "rawtypes"}) private IWorkingSet[] getSelectedWorkingSet(IStructuredSelection selection) { if (!(selection instanceof ITreeSelection)) return EMPTY_WORKING_SET_ARRAY; ITreeSelection treeSelection = (ITreeSelection) selection; if (treeSelection.isEmpty()) return EMPTY_WORKING_SET_ARRAY; List elements = treeSelection.toList(); if (elements.size() == 1) { Object element = elements.get(0); TreePath[] paths = treeSelection.getPathsFor(element); if (paths.length != 1) return EMPTY_WORKING_SET_ARRAY; TreePath path = paths[0]; if (path.getSegmentCount() == 0) return EMPTY_WORKING_SET_ARRAY; Object candidate = path.getSegment(0); if (!(candidate instanceof IWorkingSet)) return EMPTY_WORKING_SET_ARRAY; IWorkingSet workingSetCandidate = (IWorkingSet) candidate; if (isValidWorkingSet(workingSetCandidate)) return new IWorkingSet[] {workingSetCandidate}; return EMPTY_WORKING_SET_ARRAY; } ArrayList result = new ArrayList(); for (Iterator iterator = elements.iterator(); iterator.hasNext(); ) { Object element = iterator.next(); if (element instanceof IWorkingSet && isValidWorkingSet((IWorkingSet) element)) { result.add(element); } } return (IWorkingSet[]) result.toArray(new IWorkingSet[result.size()]); }