openrewrite/rewrite-static-analysis

AI Summary: The OpenRewrite `UnnecessaryParentheses` recipe incorrectly removes parentheses from `switch` expressions when they are immediately followed by method calls (e.g., `(switch(...) { ... }).length()`). This removal results in invalid Java code that fails to compile with an "';' expected" error, as parentheses are syntactically required for chaining methods directly after a `switch` expression.

AI Summary: This GitHub issue requests an OpenRewrite recipe to address SonarQube rule `java:S3457` by replacing `\n` with `%n` within format strings. The recipe should target calls to `String.format` and `PrintStream#printf`, ensuring platform-independent newlines are used in formatting operations.

AI Summary: This issue proposes refactoring code to prefer `System.getProperty()` over `System.getenv()` for specific, well-documented system options, such as using `System.getProperty("user.home")` instead of `System.getenv("HOME")`. The primary goal is to enhance code portability across different environments.

AI Summary: Debug and fix a NullPointerException in the OpenRewrite recipe `ReplaceCollectionToArrayArgWithEmptyArray`. The recipe aims to automatically fix static analysis issues related to using empty arrays as arguments in `Collection.toArray()`. The bug manifests when processing certain Java code, leading to a NullPointerException. The task involves analyzing the recipe's code, identifying the root cause of the NPE (likely related to null checks or handling of edge cases), and implementing a fix to ensure the recipe functions correctly without throwing exceptions.

AI Summary: Create an OpenRewrite recipe that identifies and replaces instances of string concatenation used for type conversion (e.g., "" + 1) with the more efficient and readable String.valueOf() method. The recipe should be robust enough to handle various data types and contexts, and include unit tests.

AI Summary: Create an OpenRewrite recipe that automatically removes redundant null checks in Java code when an instanceof check is already present. The recipe should identify code blocks where a null check is combined with an instanceof check on the same variable and refactor the code to remove the unnecessary null check.

AI Summary: Create an OpenRewrite recipe that automatically refactors Java code to use varargs with Arrays.asList instead of explicitly creating a new array, improving code readability. The recipe should identify instances where a new array is passed to Arrays.asList and rewrite them to use the varargs syntax.

AI Summary: Create an OpenRewrite recipe that automatically replaces instances of generating random integers using `Random.nextDouble()` followed by casting or rounding with the more efficient and direct `Random.nextInt()` method.

AI Summary: Create an OpenRewrite recipe that identifies and automatically refactors Java code where `Pattern.compile()` is called repeatedly with the same literal regular expression, replacing it with a single, pre-compiled `final` Pattern instance for improved efficiency. The recipe should handle various ways of constructing regular expressions in Java and only apply the refactoring when the pattern is a literal or constant.