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Preserve space when InstanceOfPatternMatch replaces a cast after a keyword#913

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timtebeek merged 1 commit into
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fix/instanceof-pattern-match-throw-spacing
Jun 12, 2026
Merged

Preserve space when InstanceOfPatternMatch replaces a cast after a keyword#913
timtebeek merged 1 commit into
mainfrom
fix/instanceof-pattern-match-throw-spacing

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@timtebeek timtebeek commented Jun 12, 2026

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What's changed?

InstanceOfPatternMatch could produce uncompilable code when a type cast directly followed a keyword without intervening whitespace. Given:

if (e instanceof BasisException)throw(BasisException)e;

the recipe replaced the cast (BasisException)e with the new pattern variable identifier exception. Because the cast had an empty prefix (no space after throw), the tokens fused into throwexception:

if (e instanceof BasisException exception)throwexception;   // not a statement

A cast begins with (, so it needs no separation from a preceding keyword; an identifier does. This change inserts a single separating space when the replaced expression directly follows throw, return or yield and had no existing prefix. Both the direct cast path (throw(Foo)e) and the parenthesized path (throw((Foo)e)) are handled.

Anything in particular you'd like reviewers to focus on?

The keyword list (throw/return/yield). These are the statement keywords that can be immediately followed by a parenthesized expression with no whitespace.

Checklist

…yword

When a type cast directly follows a keyword without intervening
whitespace (e.g. `throw(Foo)e`), replacing the cast with the new pattern
variable identifier fused the tokens into `throwexception`, producing
uncompilable code. Insert a single space in that case for `throw`,
`return` and `yield`.

Fixes openrewrite/rewrite-apache#135
@github-project-automation github-project-automation Bot moved this to In Progress in OpenRewrite Jun 12, 2026
@timtebeek timtebeek merged commit 49d1bdc into main Jun 12, 2026
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@timtebeek timtebeek deleted the fix/instanceof-pattern-match-throw-spacing branch June 12, 2026 11:07
@github-project-automation github-project-automation Bot moved this from In Progress to Done in OpenRewrite Jun 12, 2026
mergify Bot added a commit to robfrank/linklift that referenced this pull request Jun 18, 2026
… 2.36.0 to 2.37.0 [skip ci]

Bumps [org.openrewrite.recipe:rewrite-static-analysis](https://github.com/openrewrite/rewrite-static-analysis) from 2.36.0 to 2.37.0.
Release notes

*Sourced from [org.openrewrite.recipe:rewrite-static-analysis's releases](https://github.com/openrewrite/rewrite-static-analysis/releases).*

> 2.37.0
> ------
>
> What's Changed
> --------------
>
> * Preserve raw supertype cast on parameterized argument in `RemoveRedundantTypeCast` by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-static-analysis#915](https://redirect.github.com/openrewrite/rewrite-static-analysis/pull/915)
> * Preserve space when InstanceOfPatternMatch replaces a cast after a keyword by [`@​timtebeek`](https://github.com/timtebeek) in [openrewrite/rewrite-static-analysis#913](https://redirect.github.com/openrewrite/rewrite-static-analysis/pull/913)
> * `InstanceOfPatternMatch` not to remove double primitive cast by [`@​greg-at-moderne`](https://github.com/greg-at-moderne) in [openrewrite/rewrite-static-analysis#918](https://redirect.github.com/openrewrite/rewrite-static-analysis/pull/918)
> * Fix UseDiamondOperator throwing array index out of bounds when operating on a varargs method by [`@​sambsnyd`](https://github.com/sambsnyd) in [openrewrite/rewrite-static-analysis#919](https://redirect.github.com/openrewrite/rewrite-static-analysis/pull/919)
> * Fix false positive in `AnnotateNullableParameters` when parameter der… by [`@​stefanodallapalma`](https://github.com/stefanodallapalma) in [openrewrite/rewrite-static-analysis#868](https://redirect.github.com/openrewrite/rewrite-static-analysis/pull/868)
>
> **Full Changelog**: <openrewrite/rewrite-static-analysis@v2.36.0...v2.37.0>


Commits

* [`3d2b173`](openrewrite/rewrite-static-analysis@3d2b173) Fix false positive in `AnnotateNullableParameters` when parameter der… ([#868](https://redirect.github.com/openrewrite/rewrite-static-analysis/issues/868))
* [`6d76624`](openrewrite/rewrite-static-analysis@6d76624) Fix UseDiamondOperator throwing array index out of bounds when operating on a...
* [`dfc6176`](openrewrite/rewrite-static-analysis@dfc6176) `InstanceOfPatternMatch` not to remove double primitive cast ([#918](https://redirect.github.com/openrewrite/rewrite-static-analysis/issues/918))
* [`49d1bdc`](openrewrite/rewrite-static-analysis@49d1bdc) Preserve space when InstanceOfPatternMatch replaces a cast after a keyword (#...
* [`23503ce`](openrewrite/rewrite-static-analysis@23503ce) Preserve raw supertype cast on parameterized argument in `RemoveRedundantType...
* [`64e3203`](openrewrite/rewrite-static-analysis@64e3203) git-ignore .context/
* See full diff in [compare view](openrewrite/rewrite-static-analysis@v2.36.0...v2.37.0)
  
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Wrong refactor code related with overload variable

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