/**
* Allows to check if static import may be performed for the given element.
*
* @param element element to check
* @return target class that may be statically imported if any; <code>null</code> otherwise
*/
@Nullable
public static PsiClass getClassToPerformStaticImport(@NotNull PsiElement element) {
if (!PsiUtil.isLanguageLevel5OrHigher(element)) return null;
if (!(element instanceof PsiIdentifier)
|| !(element.getParent() instanceof PsiJavaCodeReferenceElement)) {
return null;
}
PsiJavaCodeReferenceElement refExpr = (PsiJavaCodeReferenceElement) element.getParent();
if (refExpr instanceof PsiMethodReferenceExpression) return null;
final PsiElement gParent = refExpr.getParent();
if (gParent instanceof PsiMethodReferenceExpression) return null;
if (!(gParent instanceof PsiJavaCodeReferenceElement)
|| isParameterizedReference((PsiJavaCodeReferenceElement) gParent)) return null;
PsiElement resolved = refExpr.resolve();
if (!(resolved instanceof PsiClass)) {
return null;
}
PsiClass psiClass = (PsiClass) resolved;
if (PsiUtil.isFromDefaultPackage(psiClass)
|| psiClass.hasModifierProperty(PsiModifier.PRIVATE)
|| psiClass.getQualifiedName() == null) return null;
final PsiElement ggParent = gParent.getParent();
if (ggParent instanceof PsiMethodCallExpression) {
final PsiMethodCallExpression call = (PsiMethodCallExpression) ggParent.copy();
final PsiElement qualifier = call.getMethodExpression().getQualifier();
if (qualifier == null) return null;
qualifier.delete();
final PsiMethod method = call.resolveMethod();
if (method != null && method.getContainingClass() != psiClass) return null;
} else {
final PsiJavaCodeReferenceElement copy = (PsiJavaCodeReferenceElement) gParent.copy();
final PsiElement qualifier = copy.getQualifier();
if (qualifier == null) return null;
qualifier.delete();
final PsiElement target = copy.resolve();
if (target != null && PsiTreeUtil.getParentOfType(target, PsiClass.class) != psiClass)
return null;
}
PsiFile file = refExpr.getContainingFile();
if (!(file instanceof PsiJavaFile)) return null;
PsiImportList importList = ((PsiJavaFile) file).getImportList();
if (importList == null) return null;
return psiClass;
}