README.md

metadata

language:
  - code
license: apache-2.0
task_categories:
  - text-generation
tags:
  - code
  - refactoring
  - java
  - benchmark

Java Refactoring Benchmark

Task

Given a Java source file before a refactoring and the refactoring type, produce the refactored file.

Schema

• instance_id — unique identifier
• repo — GitHub repo (owner/name)
• language — "java"
• base_commit — parent SHA (before state)
• merge_commit — commit where refactoring was applied
• refactoring_types — list of RefactoringMiner type names detected in this commit
• refactoring_descriptions — corresponding human-readable descriptions
• file_path — primary changed Java file (most lines changed)
• source_code_before — full file content before refactoring
• source_code_after — full file content after refactoring (ground truth)
• diff — full unified diff of the commit (all changed files)
• is_pure_refactoring — null = not yet checked; true = no extraneous changes
• compile_before / compile_after — null = not yet verified
• PASS_TO_PASS / FAIL_TO_PASS — null = not yet verified
• created_at — commit timestamp (ISO 8601)
• repo_license — SPDX license of the source repo
• lines_changed — total lines changed in the commit

Split

• test: 5857 instances from 23 repos

Refactoring types

{ "Change Variable Type": 2443, "Add Method Annotation": 2338, "Change Return Type": 1690, "Change Parameter Type": 1595, "Extract Method": 1398, "Add Parameter": 1351, "Rename Method": 1306, "Extract Variable": 1283, "Change Method Access Modifier": 1183, "Rename Variable": 1089, "Remove Method Annotation": 1018, "Change Attribute Type": 957, "Rename Parameter": 852, "Remove Thrown Exception Type": 738, "Add Attribute Modifier": 656, "Remove Parameter": 611, "Inline Variable": 595, "Extract And Move Method": 586, "Change Attribute Access Modifier": 572, "Rename Attribute": 517, "Move Method": 510, "Add Class Annotation": 419, "Pull Up Method": 392, "Encapsulate Attribute": 310, "Modify Method Annotation": 287, "Move Class": 282, "Add Attribute Annotation": 270, "Add Method Modifier": 263, "Add Thrown Exception Type": 238, "Rename Class": 235, "Change Class Access Modifier": 224, "Modify Class Annotation": 213, "Replace Variable With Attribute": 212, "Remove Attribute Modifier": 211, "Inline Method": 207, "Move Code": 196, "Remove Class Annotation": 192, "Parameterize Variable": 186, "Add Parameter Modifier": 185, "Pull Up Attribute": 182, "Invert Condition": 175, "Remove Method Modifier": 174, "Add Parameter Annotation": 168, "Move Attribute": 155, "Extract Attribute": 154, "Add Variable Modifier": 148, "Extract Class": 144, "Remove Attribute Annotation": 142, "Move And Rename Method": 133, "Change Thrown Exception Type": 128, "Move And Inline Method": 128, "Push Down Method": 127, "Remove Parameter Modifier": 109, "Assert Throws": 105, "Remove Parameter Annotation": 90, "Replace Generic With Diamond": 90, "Replace Attribute With Variable": 84, "Move And Rename Class": 81, "Move Source Folder": 81, "Localize Parameter": 80, "Merge Conditional": 80, "Add Class Modifier": 71, "Split Conditional": 70, "Replace Anonymous With Lambda": 59, "Remove Class Modifier": 57, "Extract Superclass": 56, "Remove Variable Modifier": 55, "Extract Fixture": 52, "Replace Conditional With Ternary": 48, "Inline Attribute": 43, "Modify Attribute Annotation": 41, "Replace Anonymous With Class": 37, "Try With Resources": 32, "Change Type Declaration Kind": 31, "Merge Parameter": 28, "Push Down Attribute": 25, "Extract Interface": 24, "Parameterize Attribute": 23, "Reorder Parameter": 23, "Split Parameter": 20, "Split Method": 16, "Rename Package": 14, "Merge Variable": 14, "Move And Rename Attribute": 13, "Extract Subclass": 12, "Move Package": 11, "Replace Loop With Pipeline": 10, "Replace Pipeline With Loop": 10, "Parameterize Test": 9, "Remove Variable Annotation": 9, "Merge Attribute": 9, "Merge Catch": 9, "Split Attribute": 8, "Add Variable Annotation": 7, "Modify Parameter Annotation": 6, "Replace Conditional With Assumption": 6, "Merge Class": 5, "Replace Attribute": 5, "Collapse Hierarchy": 4, "Merge Method": 3, "Split Class": 2, "Split Variable": 1 }

Detection

Mined using RefactoringMiner 3.1.3.