Moderne licensed

Use Empty Array for `Collection.toArray()`

Recipe IDorg.openrewrite.staticanalysis.ReplaceCollectionToArrayArgWithEmptyArray

Artifactorg.openrewrite.recipe:rewrite-static-analysis

Changes new array creation with Collection#toArray(T[]) to use an empty array argument, which is better for performance. According to the Collection#toArray(T[]) documentation: > If the collection fits in the specified array, it is returned therein. However, although it's not intuitive, allocating a right-sized array ahead of time to pass to the API appears to be generally worse for performance according to benchmarking and JVM developers due to a number of implementation details in both Java and the virtual machine. H2 achieved significant performance gains by switching to empty arrays instead pre-sized ones.

Single recipeMSAL

Usage

This recipe has no required configuration options. You’ll need the Moderne CLI configured before running the command below.

mod run . --recipe org.openrewrite.staticanalysis.ReplaceCollectionToArrayArgWithEmptyArray

If the recipe isn’t available locally, install it with:

mod config recipes jar install org.openrewrite.recipe:rewrite-static-analysis:2.40.0

Data tables

Structured output this recipe can produce.

Source files that had resultsSource files that were modified by the recipe run.org.openrewrite.table.SourcesFileResults
Source files that had search resultsSearch results that were found during the recipe run.org.openrewrite.table.SearchResults
Source files that errored on a recipeThe details of all errors produced by a recipe run.org.openrewrite.table.SourcesFileErrors
Recipe performanceStatistics used in analyzing the performance of recipes.org.openrewrite.table.RecipeRunStats