Metrics on a class

Overview

Metrics calculated on a class are used to obtain:

· the counting of the class' items (associations, attributes, operations)

· information on links with other items

· information on operations

· the counting of parameters on each operation

Counting items

These metrics are used to calculate the number of associations, attributes and operations which are:

· public

· protected

· private

· class

· abstract

· documented

· total

Figure 16 - Overview of metrics on a class

Operations

These metrics are used to calculate:

· the percentage of inherited operations (NMI)

· the number of operations added (NMA)

· the number of operations overridden (NMO)

· the average number of parameters per operation

· the degree of responsibility (CR)

· the degree of specialization (SIX)

Figure 17 - Metrics on a class - Operations

Dependencies

These metrics are used to calculate:

· the number of classes used (all the elements are used by dependency links, generalization and associations, and by links defined by the type of operation parameters concerned)

· the number of parent classes (NOP)

· the number of child classes (NOC)

· the depth of inheritance (DIT)

Figure 18 - Metrics on a class - Dependencies

Description of an operation

The complete signature of the operation is displayed.

For every operation, metrics allow you to calculate the number of:

· in parameters

· out parameters

· in/out parameters

· primitive parameters

· non-primitive parameters

· parameters of different types

· total parameters

Figure 19 - Metrics on a class