@Nullable
private PsiType extractListTypeFromContainingClass(PsiElement element) {
PsiClass listClass = PsiTreeUtil.getParentOfType(element, PsiClass.class);
if (listClass == null) {
return null;
}
final PsiMethod[] getMethods = listClass.findMethodsByName("get", true);
if (getMethods.length == 0) {
return null;
}
final PsiType type = getMethods[0].getReturnType();
if (!(type instanceof PsiClassType)) {
return null;
}
final PsiClassType classType = (PsiClassType) type;
final PsiClass parameterClass = classType.resolve();
if (parameterClass == null) {
return null;
}
PsiClass subClass = null;
while (listClass != null && !listClass.hasTypeParameters()) {
subClass = listClass;
listClass = listClass.getSuperClass();
}
if (listClass == null || subClass == null) {
return TypeUtils.getObjectType(element);
}
final PsiTypeParameter[] typeParameters = listClass.getTypeParameters();
if (!parameterClass.equals(typeParameters[0])) {
return TypeUtils.getObjectType(element);
}
final PsiReferenceList extendsList = subClass.getExtendsList();
if (extendsList == null) {
return null;
}
final PsiJavaCodeReferenceElement[] referenceElements = extendsList.getReferenceElements();
if (referenceElements.length == 0) {
return null;
}
final PsiType[] types = referenceElements[0].getTypeParameters();
if (types.length == 0) {
return TypeUtils.getObjectType(element);
}
return types[0];
}
