• There are 609 files with units, with 59,448 lines of code.
• 2 very complex files (McCabe index sum 251+; 2,092 lines of code)
• 5 complex files (McCabe index sum 126-250; 2,427 lines of code)
• 50 medium complex files (McCabe index sum 51-125; 16,025 lines of code)
• 77 slightly complex files (McCabe index sum 26-50; 12,596 lines of code)
• 475 simple files (McCabe index sum 1-25; 26,308 lines of code)
• 92 main files have no units (e.g. languages without unit analysis, or files without functions) and are not classified.

The McCabe index of a file grows with its size: per 100 lines tells a large but plain file from a dense one, and most complex unit whether the complexity sits in one unit or is spread over many.

File	# lines	# units	McCabe index (sum)	per 100 lines	most complex unit
HollowObjectTypeMapper.java in hollow/src/main/java/com/netflix/hollow/core/write/objectmapper	1068	31	330	31	47
HollowMessageMapper.java in hollow-protoadapter/src/main/java/com/netflix/hollow/protoadapter	1024	28	283	28	50
VarInt.java in hollow/src/main/java/com/netflix/hollow/core/memory/encoding	297	27	148	50	18
HollowProtoAdapter.java in hollow-protoadapter/src/main/java/com/netflix/hollow/protoadapter	577	29	144	25	26
HollowJsonAdapter.java in hollow-jsonadapter/src/main/java/com/netflix/hollow/jsonadapter	505	28	138	27	25
HollowPrimaryKeyIndex.java in hollow/src/main/java/com/netflix/hollow/core/index	544	41	136	25	10
HollowUniqueKeyIndex.java in hollow/src/main/java/com/netflix/hollow/core/index	504	41	127	25	10
HollowConsumer.java in hollow/src/main/java/com/netflix/hollow/api/consumer	667	92	122	18	11
AbstractHollowProducer.java in hollow/src/main/java/com/netflix/hollow/api/producer	799	38	116	15	13
HollowTypeWriteState.java in hollow/src/main/java/com/netflix/hollow/core/write	438	42	109	25	10
HollowReadFieldUtils.java in hollow/src/main/java/com/netflix/hollow/core/read	244	14	96	39	25
HollowProducer.java in hollow/src/main/java/com/netflix/hollow/api/producer	488	70	95	19	14
HollowPOJOClassGenerator.java in hollow/src/main/java/com/netflix/hollow/api/codegen	368	22	92	25	11
ByteArrayOrdinalMap.java in hollow/src/main/java/com/netflix/hollow/core/memory	404	41	89	22	10
HollowObjectTypeReadState.java in hollow/src/main/java/com/netflix/hollow/core/read/engine/object	445	33	88	20	10
HollowSparseIntegerSet.java in hollow/src/main/java/com/netflix/hollow/core/index	351	29	88	25	12
HollowRecordJsonStringifier.java in hollow/src/main/java/com/netflix/hollow/tools/stringifier	376	18	85	23	11
HollowCombiner.java in hollow/src/main/java/com/netflix/hollow/tools/combine	348	22	84	24	33
HollowWriteStateEngine.java in hollow/src/main/java/com/netflix/hollow/core/write	343	42	83	24	10
TransitiveSetTraverser.java in hollow/src/main/java/com/netflix/hollow/tools/traverse	262	15	81	31	10
HollowMapTypeReadState.java in hollow/src/main/java/com/netflix/hollow/core/read/engine/map	390	33	81	21	10
HollowCodeGenerationUtils.java in hollow/src/main/java/com/netflix/hollow/api/codegen	340	25	81	24	9
FlatRecordDumper.java in hollow/src/main/java/com/netflix/hollow/core/write/objectmapper/flatrecords	312	13	80	26	27
HollowObjectTypeWriteState.java in hollow/src/main/java/com/netflix/hollow/core/write	335	22	79	24	12
HollowAPIGenerator.java in hollow/src/main/java/com/netflix/hollow/api/codegen	321	32	79	25	11
FilteredHollowBlobWriter.java in hollow/src/main/java/com/netflix/hollow/tools/filter	311	15	76	24	23
HollowMapTypeWriteState.java in hollow/src/main/java/com/netflix/hollow/core/write	387	13	76	20	16
HollowObjectSchema.java in hollow/src/main/java/com/netflix/hollow/core/schema	276	27	76	28	11
ThreadSafeBitSet.java in hollow/src/main/java/com/netflix/hollow/core/memory	272	23	75	28	11
HollowSetTypeWriteState.java in hollow/src/main/java/com/netflix/hollow/core/write	361	13	72	20	16
HollowBlobReader.java in hollow/src/main/java/com/netflix/hollow/core/read/engine	278	27	72	26	9
HollowReadStateEngine.java in hollow/src/main/java/com/netflix/hollow/core/read/engine	279	45	71	25	8
HollowSetTypeReadState.java in hollow/src/main/java/com/netflix/hollow/core/read/engine/set	347	31	71	20	10
TST.java in hollow/src/main/java/com/netflix/hollow/core/index	266	20	71	27	14
StaleHollowReferenceDetector.java in hollow/src/main/java/com/netflix/hollow/api/client	218	24	71	33	12
HollowObjectJavaGenerator.java in hollow/src/main/java/com/netflix/hollow/api/codegen/objects	392	19	68	17	18
HollowClientUpdater.java in hollow/src/main/java/com/netflix/hollow/api/client	296	23	67	23	24
HollowHistory.java in hollow/src/main/java/com/netflix/hollow/tools/history	331	23	65	20	8
TypeFilter.java in hollow/src/main/java/com/netflix/hollow/core/read/filter	304	31	65	21	19
HollowHashIndexBuilder.java in hollow/src/main/java/com/netflix/hollow/core/index	342	19	65	19	17
HollowStateDeltaPatcher.java in hollow/src/main/java/com/netflix/hollow/tools/patch/delta	338	18	64	19	12
HollowListTypeWriteState.java in hollow/src/main/java/com/netflix/hollow/core/write	271	13	63	23	16
CodeGeneratorConfig.java in hollow/src/main/java/com/netflix/hollow/api/codegen	194	30	63	32	22
HollowJsonAdapterPrimaryKeyFinder.java in hollow-jsonadapter/src/main/java/com/netflix/hollow/jsonadapter	194	6	62	32	41
SegmentedByteArray.java in hollow/src/main/java/com/netflix/hollow/core/memory	288	19	61	21	12
FlatRecordOrdinalReader.java in hollow/src/main/java/com/netflix/hollow/core/write/objectmapper/flatrecords	255	19	60	24	12
DiffViewOutputGenerator.java in hollow-diff-ui/src/main/java/com/netflix/hollow/diffview	172	15	60	35	11
HollowJsonAdapterSchemaDiscoverer.java in hollow-jsonadapter/src/main/java/com/netflix/hollow/jsonadapter/discover	183	13	59	32	23
DuplicateDataDetectionValidator.java in hollow/src/main/java/com/netflix/hollow/api/producer/validation	301	27	58	19	10
HollowHashIndex.java in hollow/src/main/java/com/netflix/hollow/core/index	254	27	57	22	9

• File complexity is the sum of the McCabe indexes (conditional complexity) of the units (methods, functions...) in a file.
• Files are classified in five categories based on that sum: 1-25 (simple files), 26-50 (slightly complex files), 51-125 (medium complex files), 126-250 (complex files), 251+ (very complex files). The default bands are five times the unit complexity bands, as a file is a group of units.
• Only main code files with units are classified. Files without units (languages without unit analysis, or files without functions) have no complexity to measure and are left out rather than counted as simple.
• A very complex file holds many decisions, which often means it has too many responsibilities: a candidate to split, and a place where changes need more testing.