Introduction

The program CKJM extended calculates nineteen size and structure software metrics by processing the bytecode of compiled Java files. The program calculates for each class the following metrics, and displays them on its standard output or saves in file, following the class's name:

• WMC: Weighted methods per class (NOM: Number of Methods in the QMOOD metric suite)
• DIT: Depth of Inheritance Tree
• NOC: Number of Children
• CBO: Coupling between object classes
• RFC: Response for a Class
• LCOM: Lack of cohesion in methods
• Ca: Afferent coupling (not a C&K metric)
• Ce: Efferent coupling (not a C&K metric)
• NPM: Number of Public Methods for a class (not a C&K metric; CIS: Class Interface Size in the QMOOD metric suite)
• LCOM3: Lack of cohesion in methods Henderson-Sellers version
• LCO: Lines of Code (not a C&K metric)
• DAM: Data Access Metric (QMOOD metric suite)
• MOA: Measure of Aggregation (QMOOD metric suite)
• MFA: Measure of Functional Abstraction (QMOOD metric suite)
• CAM: Cohesion Among Methods of Class (QMOOD metric suite)
• IC: Inheritance Coupling (quality oriented extension to C&ampK metric suite)
• CBM: Coupling Between Methods (quality oriented extension to C&ampK metric suite)
• AMC: Average Method Complexity (quality oriented extension to C&ampK metric suite)
• CC: McCabe's Cyclomatic Complexity

This program has been initially written as an extended version of ckjm 1.8. It was extended through increasing the number of software metrics that it calculates. The initial version of ckjm extended is 2.0. It was written on top of the ckjm 1.8 and thus it could be considered as the next version of the ckjm.

The project is hosted on GitHub: https://github.com/mjureczko/CKJM-extended. Please, refer to the page in order to get the current source code or report an issue.

To run the program you simply specify the class files (or jar files) on its command line or standard input. The program will produce on its standard output a line for each class containing the complete name of the class and the values of the corresponding class metrics. Ckjm can be use as an ant task too (where offers a xml output). This operation model allows the tool to be easily extended using textual pre and post processors.

 Last change: Jul 24, 2015 20:44 pm
 Unless otherwise expressly stated, all original material on this page created by Diomidis Spinellis or Marian Jureczko is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 2.5 License.