public static boolean typesMatch(Class<?>[] usedTypes, Class<?>[] expectedTypes) {
// expectedTypes is empty
if (ArrayUtil.isEmpty(expectedTypes)) return ArrayUtil.isEmpty(usedTypes);
Class<?> lastExpectedType = ArrayUtil.lastElementOf(expectedTypes);
if (lastExpectedType.isArray()) {
// process varargs parameter
if (usedTypes.length < expectedTypes.length - 1) return false; // fault
if (usedTypes.length == expectedTypes.length - 1)
return typesMatch(
usedTypes, ArrayUtil.copyOfRange(expectedTypes, 0, usedTypes.length)); // empty varargs
// check if all used types match the varargs type
if (usedTypes.length >= expectedTypes.length) {
Class<?> componentType = lastExpectedType.getComponentType();
for (int i = expectedTypes.length - 1; i < usedTypes.length; i++) {
Class<?> foundType = usedTypes[i];
if (!typeMatches(foundType, componentType)) return false;
}
return true;
}
}
if (usedTypes.length != expectedTypes.length) return false;
if (expectedTypes.length == 0 && usedTypes.length == 0) return true;
for (int i = 0; i < usedTypes.length; i++) {
Class<?> expectedType = expectedTypes[i];
Class<?> foundType = usedTypes[i];
if (!typeMatches(foundType, expectedType)) return false;
}
return true;
}
/**
* Finds a method by reflection. This iterates all methods of the class, comparing names and
* parameter types. Unlike the method Class.getMethod(String, Class ...), this method is able to
* match primitive and wrapper types. If no appropriate method is found, 'null' is returned
*
* @param type
* @param methodName
* @param paramTypes
* @return a method with matching names and parameters
*/
public static Method findMethod(Class<?> type, String methodName, Class<?>... paramTypes) {
Method result = null;
for (Method method : type.getMethods()) {
if (!methodName.equals(method.getName())) continue;
if (typesMatch(paramTypes, method.getParameterTypes())) {
result = method;
if ((ArrayUtil.isEmpty(paramTypes) && ArrayUtil.isEmpty(method.getParameterTypes()))
|| paramTypes.length == method.getParameterTypes().length)
return method; // optimal match - return it immediately
else
result = method; // sub optimal match - store it, but keep on searching for better matches
}
}
return result;
}