/**
* Returns the target types that need to have conversion. The types contain first as many
* constructor parameter types as we have and then the types of properties of object as given by
* names of result-set.
*/
@NotNull
private static Optional<List<Type>> findTargetTypes(
@NotNull Constructor<?> ctor, @NotNull List<String> resultSetColumns) {
List<Type> constructorParameterTypes = asList(ctor.getGenericParameterTypes());
int constructorParameterCount = constructorParameterTypes.size();
if (constructorParameterCount > resultSetColumns.size()) {
// We don't have enough columns in ResultSet to instantiate this constructor, discard it.
return Optional.empty();
} else if (constructorParameterCount == resultSetColumns.size()) {
// We have exactly enough column in ResultSet. Use the constructor as it is.
return Optional.of(constructorParameterTypes);
} else {
// Get the types of remaining properties
ArrayList<Type> result = new ArrayList<>(resultSetColumns.size());
result.addAll(constructorParameterTypes);
List<String> propertyNames =
resultSetColumns.subList(constructorParameterCount, resultSetColumns.size());
for (String name : propertyNames) {
Type type = PropertyAccessor.findPropertyType(ctor.getDeclaringClass(), name).orElse(null);
if (type != null) result.add(type);
else return Optional.empty();
}
return Optional.of(result);
}
}
@NotNull
private static PropertyAccessor createAccessor(
int index, @NotNull Class<?> cl, @NotNull List<String> names) {
return PropertyAccessor.findAccessor(cl, names.get(index))
.orElseThrow(
() ->
new InstantiationFailureException(
"Could not find neither setter nor field for '" + names.get(index) + '\''));
}