PsiType (@NotNull GrParameter parameter) { final PsiType type = getType(parameter); if (type instanceof PsiArrayType) { return type; } final PsiClassType.ClassResolveResult result = PsiUtil.resolveGenericsClassInType(type); final PsiClass psiClass = result.getElement(); if (psiClass == null) return type; final HashSet<PsiTypeParameter> usedTypeParameters = new HashSet<>(); collectTypeParameters(usedTypeParameters, parameter); for (Iterator<PsiTypeParameter> iterator = usedTypeParameters.iterator(); iterator.hasNext(); ) { PsiTypeParameter usedTypeParameter = iterator.next(); if (parameter.getDeclarationScope() != usedTypeParameter.getOwner()) { iterator.remove(); } } final PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(parameter.getProject()); PsiSubstitutor subst = PsiSubstitutor.EMPTY; for (PsiTypeParameter usedTypeParameter : usedTypeParameters) { subst = subst.put(usedTypeParameter, TypeConversionUtil.typeParameterErasure(usedTypeParameter)); } PsiSubstitutor substitutor = PsiSubstitutor.EMPTY; final Map<PsiTypeParameter, PsiType> typeMap = result.getSubstitutor().getSubstitutionMap(); for (PsiTypeParameter typeParameter : typeMap.keySet()) { final PsiType psiType = typeMap.get(typeParameter); substitutor = substitutor.put(typeParameter, psiType != null ? subst.substitute(psiType) : null); } return psiClass instanceof PsiTypeParameter ? subst.substitute((PsiTypeParameter)psiClass) : elementFactory.createType(psiClass, substitutor); }