/**
* Finds method that accessible from specified class.
*
* @param method object that represents found method
* @param generic generic type that is used to find accessible method
* @return object that represents accessible method
* @throws NoSuchMethodException if method is not accessible or is not found in specified
* superclass or interface
*/
private static Method findAccessibleMethod(Method method, Type generic)
throws NoSuchMethodException {
String name = method.getName();
Class<?>[] params = method.getParameterTypes();
if (generic instanceof Class) {
Class<?> type = (Class<?>) generic;
return findAccessibleMethod(type.getMethod(name, params));
}
if (generic instanceof ParameterizedType) {
ParameterizedType pt = (ParameterizedType) generic;
Class<?> type = (Class<?>) pt.getRawType();
for (Method m : type.getMethods()) {
if (m.getName().equals(name)) {
Class<?>[] pts = m.getParameterTypes();
if (pts.length == params.length) {
if (Arrays.equals(params, pts)) {
return findAccessibleMethod(m);
}
Type[] gpts = m.getGenericParameterTypes();
if (params.length == gpts.length) {
if (Arrays.equals(params, TypeResolver.erase(TypeResolver.resolve(pt, gpts)))) {
return findAccessibleMethod(m);
}
}
}
}
}
}
throw new NoSuchMethodException("Method '" + name + "' is not accessible");
}
/**
* Finds method that is accessible from public class or interface through class hierarchy.
*
* @param method object that represents found method
* @return object that represents accessible method
* @throws NoSuchMethodException if method is not accessible or is not found in specified
* superclass or interface
*/
public static Method findAccessibleMethod(Method method) throws NoSuchMethodException {
Class<?> type = method.getDeclaringClass();
if (Modifier.isPublic(type.getModifiers()) && isPackageAccessible(type)) {
return method;
}
if (Modifier.isStatic(method.getModifiers())) {
throw new NoSuchMethodException("Method '" + method.getName() + "' is not accessible");
}
for (Type generic : type.getGenericInterfaces()) {
try {
return findAccessibleMethod(method, generic);
} catch (NoSuchMethodException exception) {
// try to find in superclass or another interface
}
}
return findAccessibleMethod(method, type.getGenericSuperclass());
}
/**
* Checks validness of the method. The valid method should be public and should have the specified
* name.
*
* @param method the object that represents method
* @return {@code true} if the method is valid, {@code false} otherwise
*/
@Override
protected boolean isValid(Method method) {
return super.isValid(method) && method.getName().equals(this.name);
}