@Nullable
public static PsiType getLeastUpperBound(PsiType type1, PsiType type2, PsiManager manager) {
if (TypeConversionUtil.isPrimitiveAndNotNull(type1)
|| TypeConversionUtil.isPrimitiveAndNotNull(type2)) return null;
if (TypeConversionUtil.isNullType(type1)) return type2;
if (TypeConversionUtil.isNullType(type2)) return type1;
if (Comparing.equal(type1, type2)) return type1;
return getLeastUpperBound(type1, type2, new LinkedHashSet<Pair<PsiType, PsiType>>(), manager);
}
@Override
public boolean isAvailable(
@NotNull Project project,
@NotNull PsiFile file,
@NotNull PsiElement startElement,
@NotNull PsiElement endElement) {
final PsiMethod myMethod = (PsiMethod) startElement;
PsiType myReturnType = myReturnTypePointer.getType();
return myMethod.isValid()
&& myMethod.getManager().isInProject(myMethod)
&& myReturnType != null
&& myReturnType.isValid()
&& !TypeConversionUtil.isNullType(myReturnType)
&& myMethod.getReturnType() != null
&& !Comparing.equal(myReturnType, myMethod.getReturnType());
}