public class MethodInvoker
Helper class that allows for specifying a method to invoke in a declarative
fashion, be it static or non-static.
Usage: Specify "targetClass"/"targetMethod" or "targetObject"/"targetMethod",
optionally specify arguments, prepare the invoker. Afterwards, you may
invoke the method any number of times, obtaining the invocation result.
public static int getTypeDifferenceWeight(java.lang.Class<?> paramTypes,
Algorithm that judges the match between the declared parameter types of a candidate method
and a specific list of arguments that this method is supposed to be invoked with.
Determines a weight that represents the class hierarchy difference between types and
arguments. A direct match, i.e. type Integer -> arg of class Integer, does not increase
the result - all direct matches means weight 0. A match between type Object and arg of
class Integer would increase the weight by 2, due to the superclass 2 steps up in the
hierarchy (i.e. Object) being the last one that still matches the required type Object.
Type Number and class Integer would increase the weight by 1 accordingly, due to the
superclass 1 step up the hierarchy (i.e. Number) still matching the required type Number.
Therefore, with an arg of type Integer, a constructor (Integer) would be preferred to a
constructor (Number) which would in turn be preferred to a constructor (Object).
All argument weights get accumulated.
Note: This is the algorithm used by MethodInvoker itself and also the algorithm
used for constructor and factory method selection in Spring's bean container (in case
of lenient constructor resolution which is the default for regular bean definitions).