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--- pom [2010/03/11 22:32]
ptidejteam created
+++ pom [2025/01/15 21:40] (current)
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-=== Metrics definitions ===
+====== POM ======
-ACAIC	Ancestor Class-Attribute Import Coupling
+POM stands for Primitives, Operations, Metrics and is a framework built to compute software metrics on PADL models. A paper introducing POM has been published by [[http://www.ptidej.net/publications/Author/ZAIDI-F.php|Zaidi, Guéhéneuc, and Sahraoui]] and can be used as reference. Metrics can be a several kinds:
-ACMIC	Ancestors Class-Method Import Coupling
+  * Unary or binary, depending on whether they take as input one or two [[padl|IFirstClassEntity(ies)]];
-AID	Average Inheritance Depth of an entity
+  * Context dependent or independent, depending on whether they can be computed by considering given [[padl|IFirstClassEntity(ies)]] independently of the rest of the model.
-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
+===== Metrics Definition =====
-CBOin	Coupling Between Objects of one entity
-CBOout	Coupling Between Objects of one entity
+^ Names ^ Definitions ^
-CIS	Counts the number of public methods in a class
+| ACAIC	| Ancestor Class-Attribute Import Coupling |
-CLD	Class to Leaf Depth of an entity.
+| ACMIC	| Ancestors Class-Method Import Coupling |
-cohesionAttributes
+| AID	| Average Inheritance Depth of an entity |
-connectivity
+| ANA	| Average number of entities from which an entity inherits informations wrt. to the total number of entities in a model |
-CP	The number of packages that depend on the package containing entity
+| CAM	| Relatedness among methods of an entity based on the parameter list of its methods |
-DAM	Returns the ratio of the number of private(protected) Attributes to the total number of Attributes declared in a class
+| CBO	| Coupling Between Objects of one entity |
-DCAEC	Returns the DCAEC (Descendants Class-Attribute Export Coupling) of one entity
+| CBOingoing	| Coupling Between Objects of one entity (in-going coupling only, towards the entity) |
-DCC	Returns the number of classes a class is directly related to(by attribute declarations and message passing
+| CBOoutgoing	| Coupling Between Objects of one entity (out-going coupling only, from the entity) |
-DCMEC	Returns the DCMEC (Descendants Class-Method Export Coupling) of one entity
+| CIS	| Number of public methods in a class |
-DIT	Returns the DIT (Depth of inheritance tree) of an entity.
+| CLD	| Class to Leaf Depth of an entity |
-DSC	Count of the total number of classes in the design
+| cohesionAttributes	| Percentage of fields (declared and inherited) used by the declared methods of one entity wrt. all its fields |
-EIC	the number of inheritance relationships in which superclasses are in external packages
+| connectivity	| Number of couples of methods that use each other |
-EIP	the number of inheritance relationships where the superclass is in the package containing entity and the subclass is in another package
+| CP	| Number of packages that depend on the package containing the entity |
-ICHClass	Compute the complexity of an entity as the sum of the complexities of its declared and inherited methods
+| DAM	| Ratio of the number of private (and protected) fields wrt. the total number of fields declared in an entity |
-LCOM1	Returns the LCOM (Lack of COhesion in Methods) of an entity
+| DCAEC	| Descendants Class-Attribute Export Coupling of one entity |
-LCOM2	Returns the LCOM (Lack of COhesion in Methods) of an entity
+| DCCdesign	| Number of classes that a class is directly related to (by attribute and parameter declarations) |
-MFA	The ratio of the number of methods inherited by a class to the number of methods accessible by member methods of the class
+| DCCimplementation	| Number of classes that a class is directly related to (by attribute declarations and message passing) |
-MOA	Count the number of data declarations whose types are user defined classes
+| DCMEC	| Descendants Class-Method Export Coupling of one entity |
-NAD	number of attributes declared
+| DIT	| Depth of Inheritance Tree of an entity |
-NADExtended	Number of attributes declared in a class and in its member classes
+| DSC	| Number of top-level entities in a model |
-NCM	Returns the NCM (Number of Changed Methods) of an entity.
+| EIC	| Number of inheritance relationships in which super-entities are in external packages |
-NCP	the number of classes package containing entity
+| EIP	| Number of inheritance relationships where the super-entity is in the package containing the entity and the sub-entites is in another package |
-NMA	Returns the NMA (Number of New Methods) of an entity
+| FanOut | Number of methods and fields used by one entity |
-NMD	number of methods declared
+| ICHClass	| Complexity of an entity as the sum of the complexities of its declared and inherited methods |
-NMDExtended	Number of methods declared in the class and in its member classes
+| IR | Number of calls from the methods of an entity to the methods and fields declared in its super-entities |
-NMI	Returns the NMI (Number of Methods Inherited) of an entity
+| LCOM1	| Lack of COhesion in Methods of an entity |
-NMO	Returns the NMO (Number of Methods Overridden) of an entity
+| LCOM2	| Lack of COhesion in Methods of an entity |
-NOA	Returns the NOA (Number Of Ancestors) of an entity
+| LCOM5	| Lack of COhesion in Methods of an entity |
-NOC	Returns the NOC (Number Of Children) of an entity
+| LOC | Sum of the numbers of lines of code in the methods of an entity |
-NOD	Returns the NOD (Number Of Descendents) of an entity
+| McCabe | Sum of the cyclomatic complexities of the operations of an entity |
-NOH	Count The number of class hierarchies in the design
+| MFA	| Ratio of the number of methods inherited by an entity wrt. the number of methods accessible by member methods of the entity |
-NOM	Counts all methods defined in a class
+| MLOCsum | Sum of the numbers of lines of code in the methods of an entity. Same as LOC |
-NOP	Returns the NOP (Number Of Parents) of an entity
+| MOA	| Number of data declarations whose types are user-defined entities |
-NOParam	Compute the average number of parameters of methods
+| NAD	| Number of Attributes Declared by an entity |
-NOPM	Count of the Methods that can exhibit polymorphic behavior
+| NADextended	| Number of Attributes Declared by an entity and in its member entities |
-PIIR	The number of inheritance relationships existing between classes in the package containing entity
+| NCM	| Number of Changed Methods of an entity wrt. its hierarchy |
-PP	The number of provider packages of the package containing entity
+| NCP	| Number of Classes Package containing an entity, i.e., the "depth" of the package containment |
-REIP	EIP divided by the sum of PIIR and EIP
+| NMA	| Number of Methods Added by an entity wrt. its hierarchy |
-RFP	the number of class references from classes belonging to other packages to classes belonging to the package containing entity
+| NMD	| Number of Methods Declared by an entity |
-RPII	PIIR divided by the sum of PIIR and EIP.
+| NMDextended	| Number of Methods Declared by an entity and its member entities |
-RRFP	RFP divided by the sum of RFP and the number of internal class references
+| NMI	| Number of Methods Inherited by an entity. Constructors or not considered as method, they are not counted in the result of the metric |
-RRTP	RTP divided by the sum of RTP and the number of internal class references
+| NMO	| Number of Methods Overridden by an entity |
-RTP	The number of class references from classes in the package containing entity to classes in other packages
+| NOA	| Number Of Ancestors of an entity |
-SIX	Returns the SIX (Specialisation IndeX) of an entity
+| NOC	| Number Of Children of an entity |
-WMC1	Computes the weight of an entity considering the complexity of a method to be unity
+| NOD	| Number of descendents of an entity |
-McCabe	McCabe Complexity: Number of points of decision + 1
+| NOF | Number Of Fields declared by an entity |
-CBO	Coupling Between Objects of one entity
+| NOH	| Number Of Hierarchies in a model |
-LCOM5	Returns the LCOM (Lack of COhesion in Methods) of an entity
+| NOM	| Number Of Methods declared by an entity |
-WMC	Computes the weight of an entity by computing the number of method invocations in each method
+| NOP	| Number Of Parents of an entity |
+| NOParam	| Number of parameters of the methods of an entity |
+| NOPM	| Number Of Polymorphic Methods in an entity wrt. its hierarchy |
+| NOTC | Number of invocations of JUnit assert methods that occur in the code of a test case |
+| NOTI | Number Of Transitive Invocation among methods of a class. See the Law of Demeter for a definition |
+| NPrM | Number protected members of an entity |
+| oneWayCoupling | Coupling Between Objects of one entity (out-going coupling only, from the entity). Same as CBOoutgoing |
+| PIIR	| Number of inheritance relationships existing between entities in the package containing an entity |
+| PP	| Number of provider packages of the package containing an entity |
+| REIP	| EIP divided by the sum of PIIR and EIP |
+| RFC | Response for class: number of methods of an entity and of methods of other entities that are invoked by the methods of the entity |
+| RFCextended | Response for class: number of methods of an entity and of methods of other entities that are invoked by the methods of the entity plus number of methods declared by that entity |
+| RFP	| Number of references from entities belonging to other packages to entities belonging to the package containing an 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	| Number of references from entities in the package containing an entity to entities in other packages |
+| SIX	| Specialisation IndeX of an entity |
+| TestCaseLOC | Number of lines of code of all the methods of a test case |
+| TLOC | Number of lines of code of all the methods of an entity. Same as LOC |
+| VGSum | Sum of the cyclomatic complexities of the operations of an entity. Same as McCabe |
+| WMC1	| Weight of an entity considering the complexity of each of its method as being 1. (Default constructors are considered even if not explicitely declared) |
+| WMCinvocations	| Weight of an entity considering the complexity of each of its method as being the numbers of invocations that they perform. (Default constructors are considered even if not explicitely declared). |
+| WMCmccabe | Weight of an entity considering the complexity of each of its method as being their McCabe cyclomatic complexity. (Default constructors are considered even if not explicitely declared). |
+===== Metrics Computation =====
+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:
+   * ''computeMetricsFromDirectory''
+   * ''computeMetricsFromEclipse''
+   * ''computeMetricsFromJARs''
+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''. As other repositories, POM makes it easy [[repositories|to access the different kinds of metrics]].

Ptidej Team

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