apache / logging-log4j2 - Conditional Complexity

Intro

Conditional complexity (also called cyclomatic complexity) is a term used to measure the complexity of software. The term refers to the number of possible paths through a program function. A higher value ofter means higher maintenance and testing costs (infosecinstitute.com).
Conditional complexity is calculated by counting all conditions in the program that can affect the execution path (e.g. if statement, loops, switches, and/or operators, try and catch blocks...).
Conditional complexity is measured at the unit level (methods, functions...).
Units are classified in four categories based on the measured McCabe index: 1-5 (simple units), 6-10 (medium complex units), 11-25 (complex units), 26+ (very complex units).

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Conditional Complexity Overall

There are 11,668 units with 88,194 lines of code in units (61.2% of code).

3 very complex units (629 lines of code)
10 complex units (835 lines of code)
133 medium complex units (7,282 lines of code)
425 simple units (11,798 lines of code)
11,097 very simple units (67,650 lines of code)

Legend:

51+

26-50

11-25

6-10

1-5

Alternative Visuals

3D view of all units

Conditional Complexity per Extension

51+

26-50

11-25

6-10

1-5

Conditional Complexity per Logical Component

primary logical decomposition

51+

26-50

11-25

6-10

1-5

Most Complex Units

Top 50 most complex units

Unit	# lines	McCabe index	# params
protected void addToSet() in log4j-core/src/main/java/org/apache/logging/log4j/core/util/CronExpression.java	139	70	4
protected int storeExpressionVals() in log4j-core/src/main/java/org/apache/logging/log4j/core/util/CronExpression.java	176	68	3
public Date getTimeAfter() in log4j-core/src/main/java/org/apache/logging/log4j/core/util/CronExpression.java	314	66	1
public static ThrowableFormatOptions newInstance() in log4j-core/src/main/java/org/apache/logging/log4j/core/impl/ThrowableFormatOptions.java	69	38	1
protected List parsePattern() in log4j-core/src/main/java/org/apache/logging/log4j/core/util/datetime/FastDatePrinter.java	126	37	0
public Help() in log4j-core/src/main/java/org/apache/logging/log4j/core/tools/picocli/CommandLine.java	61	33	2
private int substitute() in log4j-core/src/main/java/org/apache/logging/log4j/core/lookup/StrSubstitutor.java	140	32	5
static String decodeNamedPattern() in log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/DatePatternConverter.java	48	30	1
protected void buildExpression() in log4j-core/src/main/java/org/apache/logging/log4j/core/util/CronExpression.java	71	30	1
public boolean equals() in log4j-core/src/main/java/org/apache/logging/log4j/core/impl/Log4jLogEvent.java	61	30	1
private static int findLabeledLineStartIndex() in log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/StackTraceStringResolver.java	43	30	2
public void mergConfigurations() in log4j-core/src/main/java/org/apache/logging/log4j/core/config/composite/DefaultMergeStrategy.java	113	28	3
public Configuration getConfiguration() in log4j-core/src/main/java/org/apache/logging/log4j/core/config/ConfigurationFactory.java	103	28	3
public XmlConfiguration() in log4j-core/src/main/java/org/apache/logging/log4j/core/config/xml/XmlConfiguration.java	94	25	2
protected void doConfigure() in log4j-core/src/main/java/org/apache/logging/log4j/core/config/AbstractConfiguration.java	100	25	0
public void parse() in log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/PatternParser.java	183	25	6
protected int checkNext() in log4j-core/src/main/java/org/apache/logging/log4j/core/util/CronExpression.java	121	25	4
protected void writeInternal() in log4j-core/src/main/java/org/apache/logging/log4j/core/appender/db/jdbc/JdbcDatabaseManager.java	92	25	2
public PatternConverter parse() in log4j-1.2-api/src/main/java/org/apache/log4j/helpers/PatternParser.java	84	24	0
private PatternConverter createConverter() in log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/PatternParser.java	78	23	6
private void processClusteredShortOptions() in log4j-core/src/main/java/org/apache/logging/log4j/core/tools/picocli/CommandLine.java	74	22	4
public PropertiesConfiguration build() in log4j-core/src/main/java/org/apache/logging/log4j/core/config/properties/PropertiesConfigurationBuilder.java	99	22	0
private void processArguments() in log4j-core/src/main/java/org/apache/logging/log4j/core/tools/picocli/CommandLine.java	78	21	5
public StringBuffer format() in log4j-1.2-api/src/main/java/org/apache/log4j/helpers/ISO8601DateFormat.java	89	21	3
private StringBuilder toText() in log4j-core/src/main/java/org/apache/logging/log4j/core/layout/GelfLayout.java	79	20	3
public static Level toLevel() in log4j-1.2-api/src/main/java/org/apache/log4j/helpers/OptionConverter.java	60	20	3
public void writeValue() in log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/util/JsonWriter.java	68	20	1
public String lookup() in log4j-web/src/main/java/org/apache/logging/log4j/web/WebLookup.java	67	20	2
public String lookup() in log4j-jakarta-web/src/main/java/org/apache/logging/log4j/web/WebLookup.java	67	20	2
public static String escapeJsonControlCharacters() in log4j-core/src/main/java/org/apache/logging/log4j/core/util/Transform.java	56	19	1
protected void finalizeConverter() in log4j-1.2-api/src/main/java/org/apache/log4j/helpers/PatternParser.java	82	19	1
public static void escapeJson() in log4j-api/src/main/java/org/apache/logging/log4j/util/StringBuilders.java	60	19	2
private static void format() in log4j-api/src/main/java/org/apache/logging/log4j/message/MapMessageJsonFormatter.java	67	19	3
private static ConfigResult getConfig() in log4j-core/src/main/java/org/apache/logging/log4j/core/filter/MutableThreadContextMapFilter.java	72	18	2
public String detailedSynopsis() in log4j-core/src/main/java/org/apache/logging/log4j/core/tools/picocli/CommandLine.java	73	18	3
private Object findDefaultValue() in log4j-core/src/main/java/org/apache/logging/log4j/core/config/plugins/visitors/PluginAttributeVisitor.java	30	18	1
public static boolean isAssignable() in log4j-core/src/main/java/org/apache/logging/log4j/core/util/TypeUtil.java	53	18	2
private Rfc5424Layout() in log4j-core/src/main/java/org/apache/logging/log4j/core/layout/Rfc5424Layout.java	85	18	19
private LoggerContext locateContext() in log4j-core/src/main/java/org/apache/logging/log4j/core/selector/ClassLoaderContextSelector.java	59	18	3
public static T createConnection() in log4j-core/src/main/java/org/apache/logging/log4j/core/net/UrlConnectionFactory.java	58	18	4
private void formatState() in log4j-core/src/main/java/org/apache/logging/log4j/core/message/ExtendedThreadInformation.java	68	18	2
private void parse() in log4j-1.2-api/src/main/java/org/apache/log4j/xml/XmlConfiguration.java	62	18	1
public static CouchDbProvider createNoSqlProvider() in log4j-couchdb/src/main/java/org/apache/logging/log4j/couchdb/CouchDbProvider.java	77	17	1
public boolean stop() in log4j-core/src/main/java/org/apache/logging/log4j/core/config/AbstractConfiguration.java	71	17	2
public static NameAbbreviator getAbbreviator() in log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/NameAbbreviator.java	61	17	1
private void appendStructuredElements() in log4j-core/src/main/java/org/apache/logging/log4j/core/layout/Rfc5424Layout.java	49	17	2
private int applyValueToSingleValuedField() in log4j-core/src/main/java/org/apache/logging/log4j/core/tools/picocli/CommandLine.java	56	16	6
public void mergeRootProperties() in log4j-core/src/main/java/org/apache/logging/log4j/core/config/composite/DefaultMergeStrategy.java	44	16	2
private static boolean isWildcardAssignable() in log4j-core/src/main/java/org/apache/logging/log4j/core/util/TypeUtil.java	45	16	2
private void buildAppenderLayout() in log4j-1.2-api/src/main/java/org/apache/log4j/config/Log4j1ConfigurationParser.java	76	16	2