@NotNull public static Set<PsiField> findConstantsUsedInSwitch(@Nullable PsiElement position) { if (IN_SWITCH_LABEL.accepts(position)) { Set<PsiField> used = ContainerUtil.newLinkedHashSet(); PsiSwitchStatement sw = PsiTreeUtil.getParentOfType(position, PsiSwitchStatement.class); assert sw != null; final PsiCodeBlock body = sw.getBody(); assert body != null; for (PsiStatement statement : body.getStatements()) { if (statement instanceof PsiSwitchLabelStatement) { final PsiExpression value = ((PsiSwitchLabelStatement) statement).getCaseValue(); if (value instanceof PsiReferenceExpression) { final PsiElement target = ((PsiReferenceExpression) value).resolve(); if (target instanceof PsiField) { used.add(CompletionUtil.getOriginalOrSelf((PsiField) target)); } } } } return used; } return Collections.emptySet(); }