Feature Metrics View

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type: component title: Feature Metrics View created: '2026-05-25' updated: '2026-05-25' tags:

• domain/metrics
• domain/ui status: mature related:
• 'Annotation Syntax'
• 'Extension Points'
• 'HAnS Feature Model'
• 'Metrics Module'
• 'Plugin Extensions Module' sources:
• .raw/README.md
• .raw/plugin.xml
• .raw/plugin.feature-model
• .raw/FeatureScattering.java
• .raw/FeatureTangling.java
• .raw/NestingDepths.java
• .raw/ProjectMetrics.java
• .raw/MetricsViewFactory.java

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Feature Metrics View

Bottom panel showing calculated metrics per feature.

Registration

Property	Value
Tool window ID	Feature Metrics View
Anchor	bottom
Factory class	se.isselab.HAnS.metrics.view.MetricsViewFactory

Table columns (10)

#	Column	Type
0	Feature (LPQ text)	String
1	Scattering Degree	Integer
2	Tangling Degree	Integer
3	Lines of Feature-code	Integer
4	Avg Nesting Depth	Double
5	Max Nesting Depth	Integer
6	Min Nesting Depth	Integer
7	Annotated Files	Integer
8	Folder Annotations	Integer
9	File Annotations	Integer

All columns sortable. Root features excluded (service.isRootFeature(feature)).

Refresh trigger

1. On tool window creation — triggerService() called immediately
2. Manual — "Refresh Metrics" button in title bar (AllIcons.Actions.Refresh)
3. If IDE is indexing (dumb mode): deferred via DumbService.runWhenSmart()

Refresh clears the panel, creates new JBTable wrapped in JBScrollPane, adds to BorderLayout.CENTER, calls revalidate() + repaint().

Metrics (7 — 3 undocumented in README)

Metric	Formula
Line Count	Sum of (endLine - startLine + 1) per FeatureLocationBlock, deduplicated with BitSet
Feature-to-File mappings	Distinct FileAnnotationKey entries in FeatureFileMapping.locationMap
Scattering	Contiguous line-segments across all files (TreeSet adjacency walk)
Tangling	Count of features with overlapping blocks (hasSharedLines)
Nesting depths (avg/max/min)	1 + maxContainmentCount per file; reported as three columns
Annotated Files	getNumberOfAnnotatedFiles()
Folder/File Annotations	getNumberOfFolderAnnotations() / getNumberOfFileAnnotations()

[!key-insight] README mentions 4 metrics; table has 10 columns covering 7 distinct metrics (nesting split into avg/max/min).

Related

• Metrics Module
• Plugin Extensions Module
• Extension Points
• HAnS Feature Model