Open source

Covariant equals

Recipe IDorg.openrewrite.staticanalysis.CovariantEquals

Artifactorg.openrewrite.recipe:rewrite-static-analysis

Checks that classes and records which define a covariant equals() method also override method equals(Object). Covariant equals() means a method that is similar to equals(Object), but with a covariant parameter type (any subtype of Object). Without a proper equals(Object) override, collections and other framework code that rely on the standard signature will silently use Object.equals, leading to incorrect behavior.

Single recipeOpenRewriteRSPEC-S2162Moderne Source Available License

Try in PlatformTry this recipe in the Moderne platform. Not a user yet? You’ll get a no-setup demo environment, with nothing to install or configure.

Examples

java

java

Before

class Test {
    int n;

    public boolean equals(Test tee) {
        return n == tee.n;
    }
}

After

class Test {
    int n;

    @Override
    public boolean equals(Object obj) {
        if (obj == this) return true;
        if (obj == null || getClass() != obj.getClass()) return false;
        Test tee = (Test) obj;
        return n == tee.n;
    }
}

Diff

@@ -4,1 +4,5 @@
    int n;

-   public boolean equals(Test tee) {
+   @Override
+   public boolean equals(Object obj) {
+       if (obj == this) return true;
+       if (obj == null || getClass() != obj.getClass()) return false;
+       Test tee = (Test) obj;
        return n == tee.n;

Usage

Run this recipe

This recipe has no required configuration options. Users of Moderne can run it via the Moderne CLI.

You will need to have configured the Moderne CLI on your machine before you can run the following command.

shell

mod run . --recipe CovariantEquals

If the recipe is not available locally, then you can install it using:

mod config recipes jar install org.openrewrite.recipe:rewrite-static-analysis:2.37.0

Data tables

Source files that had results

org.openrewrite.table.SourcesFileResults

Source files that were modified by the recipe run.

Column	Description
Source path before the run	The source path of the file before the run. null when a source file was created during the run.
Source path after the run	A recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Parent of the recipe that made changes	In a hierarchical recipe, the parent of the recipe that made a change. Empty if this is the root of a hierarchy or if the recipe is not hierarchical at all.
Recipe that made changes	The specific recipe that made a change.
Estimated time saving	An estimated effort that a developer to fix manually instead of using this recipe, in unit of seconds.
Cycle	The recipe cycle in which the change was made.

Source files that had search results

org.openrewrite.table.SearchResults

Search results that were found during the recipe run.

Column	Description
Source path of search result before the run	The source path of the file with the search result markers present.
Source path of search result after run the run	A recipe may modify the source path. This is the path after the run. null when a source file was deleted during the run.
Result	The trimmed printed tree of the LST element that the marker is attached to.
Description	The content of the description of the marker.
Recipe that added the search marker	The specific recipe that added the Search marker.

Source files that errored on a recipe

org.openrewrite.table.SourcesFileErrors

The details of all errors produced by a recipe run.

Column	Description
Source path	The file that failed to parse.
Recipe that made changes	The specific recipe that made a change.
Stack trace	The stack trace of the failure.

Recipe performance

org.openrewrite.table.RecipeRunStats

Statistics used in analyzing the performance of recipes.

Column	Description
The recipe	The recipe whose stats are being measured both individually and cumulatively.
Source file count	The number of source files the recipe ran over.
Source file changed count	The number of source files which were changed in the recipe run. Includes files created, deleted, and edited.
Cumulative scanning time (ns)	The total time spent across the scanning phase of this recipe.
Max scanning time (ns)	The max time scanning any one source file.
Cumulative edit time (ns)	The total time spent across the editing phase of this recipe.
Max edit time (ns)	The max time editing any one source file.