private Method lookupMethod(
Object obj, String methodName, Class[] methodParameters, HashMap methodCache) {
Class objClass = obj.getClass();
Object objMethod = methodCache.get(objClass);
if (objMethod == null) {
return cacheMethod(obj, methodName, methodParameters, methodCache);
} else if (objMethod == NONE) {
return null;
} else {
return (Method) objMethod;
}
}
private Method cacheMethod(
Object obj, String methodName, Class[] methodParameters, HashMap methodCache) {
Class objClass = obj.getClass();
Method objMethod = null;
// Look up inheritance hierarchy
while (objClass != Object.class) {
try {
objMethod = objClass.getDeclaredMethod(methodName, methodParameters);
objClass = Object.class; // executed only if call succeeds
} catch (NoSuchMethodException nsmE) {
objClass = objClass.getSuperclass();
}
}
// Cache result
if (objMethod == null) {
methodCache.put(obj.getClass(), NONE);
} else {
objMethod.setAccessible(true); // monstrous, monstrous
methodCache.put(obj.getClass(), objMethod);
}
return objMethod;
}