Metric Results

[ summary ] [ packages ] [ cycles ] [ explanations ]

The following document contains the results of a JDepend metric analysis. The various metrics are defined at the bottom of this document.

Summary

[ summary ] [ packages ] [ cycles ] [ explanations ]

Package TC CC AC Ca Ce A I D V
org.apache.commons.events.observable 18 16 2 1 6 11.0% 86.0% 3.0% 1
org.apache.commons.events.observable.standard 10 7 3 1 4 30.000002% 80.0% 10.0% 1

Packages

[ summary ] [ packages ] [ cycles ] [ explanations ]

org.apache.commons.events.observable

Afferent Couplings Efferent Couplings Abstractness Instability Distance
1 6 11.0% 86.0% 3.0%
Abstract Classes Concrete Classes Used by Packages Uses Packages
org.apache.commons.events.observable.ModificationHandlerFactory
org.apache.commons.events.observable.ModificationListener
org.apache.commons.events.observable.ModificationEvent
org.apache.commons.events.observable.ModificationEventType
org.apache.commons.events.observable.ModificationHandler
org.apache.commons.events.observable.ModificationHandler$Factory
org.apache.commons.events.observable.ModificationHandler$SetViewHandler
org.apache.commons.events.observable.ModificationHandler$SubListHandler
org.apache.commons.events.observable.ModificationVetoedException
org.apache.commons.events.observable.ObservableBag
org.apache.commons.events.observable.ObservableBuffer
org.apache.commons.events.observable.ObservableCollection
org.apache.commons.events.observable.ObservableCollection$ObservableIterator
org.apache.commons.events.observable.ObservableList
org.apache.commons.events.observable.ObservableList$ObservableListIterator
org.apache.commons.events.observable.ObservableSet
org.apache.commons.events.observable.ObservableSortedBag
org.apache.commons.events.observable.ObservableSortedSet
org.apache.commons.events.observable.standard
java.lang
java.util
org.apache.commons.collections
org.apache.commons.collections.collection
org.apache.commons.collections.iterators
org.apache.commons.events.observable.standard

org.apache.commons.events.observable.standard

Afferent Couplings Efferent Couplings Abstractness Instability Distance
1 4 30.000002% 80.0% 10.0%
Abstract Classes Concrete Classes Used by Packages Uses Packages
org.apache.commons.events.observable.standard.StandardModificationListener
org.apache.commons.events.observable.standard.StandardPostModificationListener
org.apache.commons.events.observable.standard.StandardPreModificationListener
org.apache.commons.events.observable.standard.StandardModificationEvent
org.apache.commons.events.observable.standard.StandardModificationHandler
org.apache.commons.events.observable.standard.StandardModificationHandler$Factory
org.apache.commons.events.observable.standard.StandardModificationHandler$PostHolder
org.apache.commons.events.observable.standard.StandardModificationHandler$PreHolder
org.apache.commons.events.observable.standard.StandardPostModificationEvent
org.apache.commons.events.observable.standard.StandardPreModificationEvent
org.apache.commons.events.observable
java.lang
java.util
org.apache.commons.collections
org.apache.commons.events.observable

Cycles

[ summary ] [ packages ] [ cycles ] [ explanations ]

Package Package Dependencies
org.apache.commons.events.observable org.apache.commons.events.observable.standard
org.apache.commons.events.observable
org.apache.commons.events.observable.standard org.apache.commons.events.observable
org.apache.commons.events.observable.standard

Explanation

[ summary ] [ packages ] [ cycles ] [ explanations ]

The following explanations are for quick reference and are lifted directly from the original JDepend documentation.

Term Description
Number of Classes The number of concrete and abstract classes (and interfaces) in the package is an indicator of the extensibility of the package.
Afferent Couplings The number of other packages that depend upon classes within the package is an indicator of the package's responsibility.
Efferent Couplings The number of other packages that the classes in the package depend upon is an indicator of the package's independence.
Abstractness The ratio of the number of abstract classes (and interfaces) in the analyzed package to the total number of classes in the analyzed package. The range for this metric is 0 to 1, with A=0 indicating a completely concrete package and A=1 indicating a completely abstract package.
Instability The ratio of efferent coupling (Ce) to total coupling (Ce / (Ce + Ca)). This metric is an indicator of the package's resilience to change. The range for this metric is 0 to 1, with I=0 indicating a completely stable package and I=1 indicating a completely instable package.
Distance The perpendicular distance of a package from the idealized line A + I = 1. This metric is an indicator of the package's balance between abstractness and stability. A package squarely on the main sequence is optimally balanced with respect to its abstractness and stability. Ideal packages are either completely abstract and stable (x=0, y=1) or completely concrete and instable (x=1, y=0). The range for this metric is 0 to 1, with D=0 indicating a package that is coincident with the main sequence and D=1 indicating a package that is as far from the main sequence as possible.
Cycles Packages participating in a package dependency cycle are in a deadly embrace with respect to reusability and their release cycle. Package dependency cycles can be easily identified by reviewing the textual reports of dependency cycles. Once these dependency cycles have been identified with JDepend, they can be broken by employing various object-oriented techniques.