Convert assigning Switch statements to Switch expressions#795

Merged

timtebeek merged 48 commits intomainfrom

Jul 25, 2025

Commits on Jul 18, 2025

refactor: extract helper method in util class
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Tests
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Cleaned up tests
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WIP - Working but yet to be cleaned up
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Apply best practices to avoid repeated bot suggestions

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Use `reduce` and `visitSwitch` to extract Switch element

timtebeek
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Fix six space indentation

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Reduce visibility of SwitchUtils

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Apply suggestions from code review

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fix tests to work with updated rewrite-java
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Java 17 precondition
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Don't add a `default` case if the switch is already exhaustive
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Do not apply the recipe if a case statement/body assignment is referencing the original variable
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Do not apply the recipe if the original variable initializer is anything else than a literal, variable reference, field access or an expression composed of them only
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Organize imports

timtebeek
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Move the recipe to the right java migration declarative meta recipe
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check for implicit toString() calls in the original variable initializer when checking for side effects
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Do not apply the recipe if a colon-switch label has an empty statement list AND is the last case of the switch
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Do not apply the recipe if the original variable has no initializer and the switch isn't exhaustive and each case isn't assigning the original variable a value as expected
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Small cleanup
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Inline the switch expression on the return statement when appropriate
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Comments are preserved
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Commits on Jul 21, 2025

Commits on Jul 22, 2025