pom
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Table of Contents
POM
Metrics definitions
| Names | Definitions | |
|---|---|---|
| ACAIC | Ancestor Class-Attribute Import Coupling | |
| ACMIC | Ancestors Class-Method Import Coupling | |
| AID | Average Inheritance Depth of an entity | |
| ANA | Count the average number of classes from which a class inherits informations | |
| CAM | Computes the relatedness among methods of the class based upon the parameter list of the methods | |
| CBOin | Coupling Between Objects of one entity | |
| CBOout | Coupling Between Objects of one entity | |
| CIS | Counts the number of public methods in a class | |
| CLD | Class to Leaf Depth of an entity. | |
| cohesionAttributes | ||
| connectivity | ||
| CP | The number of packages that depend on the package containing entity | |
| DAM | Returns the ratio of the number of private(protected) Attributes to the total number of Attributes declared in a class | |
| DCAEC | Returns the DCAEC (Descendants Class-Attribute Export Coupling) of one entity | |
| DCC | Returns the number of classes a class is directly related to (by attribute declarations and message passing) | |
| DCMEC | Returns the DCMEC (Descendants Class-Method Export Coupling) of one entity | |
| DIT | Returns the DIT (Depth of inheritance tree) of an entity. | |
| DSC | Count of the total number of classes in the design | |
| EIC | the number of inheritance relationships in which superclasses are in external packages | |
| EIP | the number of inheritance relationships where the superclass is in the package containing entity and the subclass is in another package | |
| ICHClass | Compute the complexity of an entity as the sum of the complexities of its declared and inherited methods | |
| LCOM1 | Returns the LCOM (Lack of COhesion in Methods) of an entity | |
| LCOM2 | Returns the LCOM (Lack of COhesion in Methods) of an entity | |
| MFA | The ratio of the number of methods inherited by a class to the number of methods accessible by member methods of the class | |
| MOA | Count the number of data declarations whose types are user defined classes | |
| NAD | number of attributes declared | |
| NADExtended | Number of attributes declared in a class and in its member classes | |
| NCM | Returns the NCM (Number of Changed Methods) of an entity. | |
| NCP | the number of classes package containing entity | |
| NMA | Returns the NMA (Number of New Methods) of an entity | |
| NMD | number of methods declared | |
| NMDExtended | Number of methods declared in the class and in its member classes | |
| NMI | Returns the NMI (Number of Methods Inherited) of an entity | |
| NMO | Returns the NMO (Number of Methods Overridden) of an entity | |
| NOA | Returns the NOA (Number Of Ancestors) of an entity | |
| NOC | Returns the NOC (Number Of Children) of an entity | |
| NOD | Returns the NOD (Number Of Descendents) of an entity | |
| NOH | Count The number of class hierarchies in the design | |
| NOM | Counts all methods defined in a class | |
| NOP | Returns the NOP (Number Of Parents) of an entity | |
| NOParam | Maximum mumber of parameters of the methods of an entity | |
| NOPM | Count of the Methods that can exhibit polymorphic behavior | |
| PIIR | The number of inheritance relationships existing between classes in the package containing entity | |
| PP | The number of provider packages of the package containing entity | |
| REIP | EIP divided by the sum of PIIR and EIP | |
| RFP | the number of class references from classes belonging to other packages to classes belonging to the package containing entity | |
| RPII | PIIR divided by the sum of PIIR and EIP. | |
| RRFP | RFP divided by the sum of RFP and the number of internal class references | |
| RRTP | RTP divided by the sum of RTP and the number of internal class references | |
| RTP | The number of class references from classes in the package containing entity to classes in other packages | |
| SIX | Returns the SIX (Specialisation IndeX) of an entity | |
| WMC1 | Computes the weight of an entity considering the complexity of a method to be unity | |
| McCabe | McCabe Complexity: Number of points of decision + 1 | |
| CBO | Coupling Between Objects of one entity | |
| LCOM5 | Returns the LCOM (Lack of COhesion in Methods) of an entity | |
| WMC | Computes the weight of an entity by computing the number of method invocations in each method |
Computing Metrics
Computing POM metrics using PADL is made easy by the helper class pom.helper.MetricsGenerator. After having installed CPL, PADL, and POM, just go into the POM Tests project and have a look at this class. It provides a main method with snippets of code to call one of the three methods:
computeMetricsFromDirectorycomputeMetricsFromEclipsecomputeMetricsFromJARs
which can be used to compute automatically metrics from various input sources. Also have a look at the constant array listing the metrics that must be computed or avoided: METRICS_TO_AVOID and METRICS_TO_COMPUTE.
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