740f02measure15 1

The MOOD Set of Object-Oriented Software Metrics

740f02measure15 2

Visibility Is_visible(M,C)

– 1 iff class C may call method M and M is in another class – I.e. public

– 0 otherwise

V(M) = sum of Is_visible for method M over all classes divided by number of other classes– percentage of other classes that can call this method

740f02measure15 3

MHF definition

Summation over all methods in all classes of 1 minus the V(M) divided by the total number of methods

 

 

TC

iid

TC

i

CM

mim

CM

MVMHF

id

1

11

,(1

740f02measure15 4

Model for MHF?

What would be a good abstraction?

Is there a well-understood Empirical Relationship?

Scale Type?

740f02measure15 5

Inheritance Factor

Md(Ci) = number of methods declared in a class i

Mi(Ci) = number of methods inherited (and not overridden)

in a class iMa(Ci) = Md(Ci) + Mi(C i) = number of methods that can

be invoked in association with class i 

TC

i ia

TC

i ii

CM

CMMIF

1

1

740f02measure15 6

Model for MIF?

What would be a good abstraction?

Is there a well-understood Empirical Relationship?

Scale Type?

740f02measure15 7

Coupling Factor

TCTC

ccclientisCF

TC

i

TC

j ji

2

1 1),(_

740f02measure15 8

Model for CF?

What would be a good abstraction?

Is there a well-understood Empirical Relationship?

Scale Type?

740f02measure15 9

Polymorphism FactorLet Mo(Ci) be the number of overriding methods in class i.

Let Mn(Ci) be the number of new methods in class i.

 Let DC(Ci) be the number of descendants of class i.

TC

i iin

TC

i io

CDCCM

CMPF

1

1

740f02measure15 10

Model for PF?

What would be a good abstraction?

Is there a well-understood Empirical Relationship?

Scale Type?