Source code metrics
Source code metrics are essential components in the software measurement process. They are extracted from the source code of the software, and their values allow us to reach conclusions about the quality attributes measured by the metrics.
OpenUnderstand supports the following source code metrics for the Java programming language.
Table 3. OpenUnderstand source code metrics for Java
| API name | Friendly name | Description |
|---|---|---|
| AvgCyclomatic | Average Cyclomatic Complexity | Average cyclomatic complexity for all nested functions or methods. |
| AvgCyclomaticModified | Average Modified Cyclomatic Complexity | Average modified cyclomatic complexity for all nested functions or methods. |
| AvgCyclomaticStrict | Average Strict Cyclomatic Complexity | Average strict cyclomatic complexity for all nested functions or methods. |
| AvgEssential | Average Essential Cyclomatic Complexity | Average Essential complexity for all nested functions or methods. |
| AvgLine | Average Number of Lines | Average number of lines for all nested functions or methods. |
| AvgLineBlank | Average Number of Blank Lines | Average number of blank for all nested functions or methods. |
| AvgLineCode | Average Number of Lines of Code | Average number of lines containing source code for all nested functions or methods. |
| AvgLineComment | Average Number of Lines with Comments | Average number of lines containing comment for all nested functions or methods. |
| CountClassBase | Base Classes | Number of immediate base classes. [aka IFANIN] |
| CountClassCoupled | Coupling Between Objects | Number of other classes coupled to. [aka CBO (coupling between object classes)] |
| CountClassDerived | Number of Children | Number of immediate subclasses. [aka NOC (number of children)] |
| CountDeclClass | Classes | Number of classes. |
| CountDeclClassMethod | Class Methods | Number of class methods. |
| CountDeclClassVariable | Class Variables | Number of class variables. |
| CountDeclExecutableUnit | Executable Unit | Number of program units with executable code. |
| CountDeclFile | Number of Files | Number of files. |
| CountDeclFunction | Function | Number of functions. |
| CountDeclInstanceMethod | Instance Methods | Number of instance methods. [aka NIM] |
| CountDeclInstanceVariable | Instance Variables | Number of instance variables. [aka NIV] |
| CountDeclMethod | Local Methods | Number of local methods. |
| CountDeclMethodAll | Methods | Number of methods, including inherited ones. [aka RFC (response for class)] |
| CountDeclMethodDefault | Local Default Visibility Methods | Number of local default methods. |
| CountDeclMethodPrivate | Private Methods | Number of local private methods. [aka NPM] |
| CountDeclMethodProtected | Protected Methods | Number of local protected methods. |
| CountDeclMethodPublic | Public Methods | Number of local public methods. [aka NPRM] |
| CountInput | Inputs | Number of calling subprograms plus global variables read. [aka FANIN] |
| CountLine | Physical Lines | Number of all lines. [aka NL] |
| CountLineBlank | Blank Lines of Code | Number of blank lines. [aka BLOC] |
| CountLineCode | Source Lines of Code | Number of lines containing source code. [aka LOC] |
| CountLineCodeDecl | Declarative Lines of Code | Number of lines containing declarative source code. |
| CountLineCodeExe | Executable Lines of Code | Number of lines containing executable source code. |
| CountLineComment | Lines with Comments | Number of lines containing comment. [aka CLOC] |
| CountOutput | Outputs | Number of called subprograms plus global variables set. [aka FANOUT] |
| CountPath | Paths | Number of possible paths, not counting abnormal exits or gotos. [aka NPATH] |
| CountPathLog | Paths Log(x) | Log10, truncated to an integer value, of the metric CountPath |
| CountSemicolon | Semicolons | Number of semicolons. |
| CountStmt | Statements | Number of statements. |
| CountStmtDecl | Declarative Statements | Number of declarative statements. |
| CountStmtExe | Executable Statements | Number of executable statements. |
| Cyclomatic | Cyclomatic Complexity | Cyclomatic complexity. |
| CyclomaticModified | Modified Cyclomatic Complexity | Modified cyclomatic complexity. |
| CyclomaticStrict | Strict Cyclomatic Complexity | Strict cyclomatic complexity. |
| Essential | Essential Complexity | Essential complexity. [aka Ev(G)] |
| Knots | Knots | Measure of overlapping jumps. |
| MaxCyclomatic | Max Cyclomatic Complexity | Maximum cyclomatic complexity of all nested functions or methods. |
| MaxCyclomaticModified | Max Modified Cyclomatic Complexity | Maximum modified cyclomatic complexity of nested functions or methods. |
| MaxCyclomaticStrict | Max Strict Cyclomatic Complexity | Maximum strict cyclomatic complexity of nested functions or methods. |
| MaxEssential | Max Essential Complexity | Maximum essential complexity of all nested functions or methods. |
| MaxEssentialKnots | Max Knots | Maximum Knots after structured programming constructs have been removed. |
| MaxInheritanceTree | Depth of Inheritance Tree | Maximum depth of class in inheritance tree. [aka DIT] |
| MaxNesting | Nesting | Maximum nesting level of control constructs. |
| MinEssentialKnots | Minimum Knots | Minimum Knots after structured programming constructs have been removed. |
| PercentLackOfCohesion | Lack of Cohesion in Methods | 100% minus the average cohesion for package entities. [aka LCOM, LOCM] |
| PercentLackOfCohesionModified | Modified Lack of Cohesion in Methods | 100% minus the average cohesion for class data members, modified for accessor methods |
| RatioCommentToCode | Comment to Code Ratio | Ratio of comment lines to code lines. |
| SumCyclomatic | Sum Cyclomatic Complexity | Sum of cyclomatic complexity of all nested functions or methods. [aka WMC] |
| SumCyclomaticModified | Sum Modified Cyclomatic Complexity | Sum of modified cyclomatic complexity of all nested functions or methods. |
| SumCyclomaticStrict | Sum Strict Cyclomatic Complexity | Sum of strict cyclomatic complexity of all nested functions or methods. |
| SumEssential | Sum Essential Complexity | Sum of essential complexity of all nested functions or methods. |
| NAMM | Number of Accessor (Getter) and Mutator (Setter) Methods | |
| NOID | Number of Identifiers | |
| NOKW | Number of Keywords | |
| HCPL | Halstead Calculated Program Length | |
| HDIF | Halstead Difficulty | |
| HEFF | Halstead Effort | |
| HNDB | Halstead Number of Delivered Bugs | |
| HPL | Halstead Program Length | |
| HPV | Halstead Program Vocabulary | |
| HTRP | Halstead Time Required to Program | |
| HVOL | Halstead Volume | |
| NOABSCLASS | Number of Abstract Class | |
| NOINTERFACE | NOINTERFACE |