Available Code Metrics

Here you will find informations about the code metrics that are currently supported. All the metrics implementations can be found in the project rm-core at the package org.repositoryminer.metric.

Metric	Description	Applies To	Data Type
AMW - Average Method Weight	The average static complexity of all methods in a class. McCabe’s cyclomatic number is used to quantify the method’s complexity [1].	Classes	Float*
ATFD - Access To Foreign Data	The number of attributes from unrelated classes that are accessed directly or by invoking accessor methods [1].	Classes and Methods	Integer
CYCLO - McCabe’s Cyclomatic Number	he number of linearly-independent paths through an operation [1].	Methods	Integer
FDP - Foreign Data Providers	The number of classes in which the attributes accessed — in conformity with the ATFD metric — are defined [1].	Methods	Integer
LAA - Locality of Attribute Accesses	The number of attributes from the method’s definition class, divided by the total number of variables accessed (including attributes used via accessor methods, see ATFD), whereby the number of local attributes accessed is computed in conformity with the LAA specifications [1].	Methods	Float*
LOC - Lines of Code	The number of lines of code of an operation, including blank lines and comment [1].	Files, Classes and Methods	Integer
LVAR - Local Variables	Number of local variables of a method.	Methods	Integer
MAXNESTING - Maximum Nesting Level	The maximum nesting level of control structures within an operation [1].	Methods	Integer
NOA - Number of Attributes	Number of attributes of a class [2].	Classes	Integer
NOAM - Number of Accessor Methods	The number of accessor (getter and setter) methods of a class [1].	Methods	Integer
NOAV - Number of Accessed Variables	The total number of variables accessed directly from the measured operation. Variables include parameters, local variables, but also instance variables and global variables [1].	Methods	Integer
NOM - Number of Methods	Number of methods of a class [1].	Classes	Integer
NOPA - Number of Public Attributes	The number of public attributes of a class [1].	Classes	Integer
NProtM - Number of Protected Members	The number of protected methods and attributes of a class [1].	Classes	Integer
PAR - Number of Parameters	Number of parameters of a method [3].	Methods	Integer
TCC - Tight Class Cohesion	The relative number of method pairs of a class that access in common at least one attribute of the measured class [1].	Classes	Float*
WMC - Weighted Method Count	The sum of the statical complexity of all methods of a class. The CYCLO metric is used to quantify the method’s complexity [1].	Classes	Integer
WOC - Weight Of a Class	The number of “functional” public methods divided by the total number of public members [1].	Classes	Float*

Notes

* Float with 2 decimal places

References

[1] - LANZA, M.; MARINESCU, R. Object-oriented metrics in practice: using software me- trics to characterize, evaluate, and improve the design of object-oriented systems. [S.l.]: Springer Science & Business Media, 2007.

[2] - OLIVEIRA, P.; VALENTE, M. T.; LIMA, F. P. Extracting relative thresholds for source code metrics. In: IEEE. Software Maintenance, Reengineering and Reverse Engineering (CSMR-WCRE), 2014 Software Evolution Week-IEEE Conference on. [S.l.], 2014. p. 254–263.

[3] - FILÓ, T.; BIGONHA, M. da S.; FERREIRA, K. A catalogue of thresholds for object- oriented software metrics. In: The First Int. Conf. on Advances and Trends in Software Engineering. [S.l.: s.n.], 2015. p. 48–55.