@Override
public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
NativeWebRequest request, WebDataBinderFactory binderFactory) throws Exception {
@SuppressWarnings("unchecked")
Map<String, MultiValueMap<String, String>> matrixVariables =
(Map<String, MultiValueMap<String, String>>) request.getAttribute(
HandlerMapping.MATRIX_VARIABLES_ATTRIBUTE, RequestAttributes.SCOPE_REQUEST);
if (CollectionUtils.isEmpty(matrixVariables)) {
return Collections.emptyMap();
}
MultiValueMap<String, String> map = new LinkedMultiValueMap<String, String>();
String pathVariable = parameter.getParameterAnnotation(MatrixVariable.class).pathVar();
if (!pathVariable.equals(ValueConstants.DEFAULT_NONE)) {
MultiValueMap<String, String> mapForPathVariable = matrixVariables.get(pathVariable);
if (mapForPathVariable == null) {
return Collections.emptyMap();
}
map.putAll(mapForPathVariable);
}
else {
for (MultiValueMap<String, String> vars : matrixVariables.values()) {
for (String name : vars.keySet()) {
for (String value : vars.get(name)) {
map.add(name, value);
}
}
}
}
return (isSingleValueMap(parameter) ? map.toSingleValueMap() : map);
}