Simplify a call chain

org.openrewrite.java.SimplifyMethodChain

Simplify a.b().c() to a.d().

Recipe source

GitHub, Issue Tracker, Maven Central

Options

Type	Name	Description	Example
List	methodPatternChain	A list of method patterns that are called in sequence	['java.util.Map keySet()', 'java.util.Set contains(..)']
String	newMethodName	The method name that will replace the existing name. The new method name target is assumed to have the same arguments as the last method in the chain.	containsKey
Boolean	matchOverrides	Optional. When enabled, find methods that are overrides of the method pattern.	false

License

This recipe is available under the Apache License Version 2.0.

Usage

This recipe has required configuration parameters. Recipes with required configuration parameters cannot be activated directly (unless you are running them via the Moderne CLI). To activate this recipe you must create a new recipe which fills in the required parameters. In your rewrite.yml create a new recipe with a unique name. For example: com.yourorg.SimplifyMethodChainExample. Here's how you can define and customize such a recipe within your rewrite.yml:

rewrite.yml

---
type: specs.openrewrite.org/v1beta/recipe
name: com.yourorg.SimplifyMethodChainExample
displayName: Simplify a call chain example
recipeList:
  - org.openrewrite.java.SimplifyMethodChain:
      methodPatternChain: ['java.util.Map keySet()', 'java.util.Set contains(..)']
      newMethodName: containsKey
      matchOverrides: false

Now that com.yourorg.SimplifyMethodChainExample has been defined, activate it in your build file:

Gradle

1. Add the following to your build.gradle file:

build.gradle

plugins {
    id("org.openrewrite.rewrite") version("7.4.1")
}

rewrite {
    activeRecipe("com.yourorg.SimplifyMethodChainExample")
    setExportDatatables(true)
}

repositories {
    mavenCentral()
}

2. Run gradle rewriteRun to run the recipe.

Maven

1. Add the following to your pom.xml file:

pom.xml

<project>
  <build>
    <plugins>
      <plugin>
        <groupId>org.openrewrite.maven</groupId>
        <artifactId>rewrite-maven-plugin</artifactId>
        <version>6.6.1</version>
        <configuration>
          <exportDatatables>true</exportDatatables>
          <activeRecipes>
            <recipe>com.yourorg.SimplifyMethodChainExample</recipe>
          </activeRecipes>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

2. Run mvn rewrite:run to run the recipe.

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 SimplifyMethodChain --recipe-option "methodPatternChain=['java.util.Map keySet()', 'java.util.Set contains(..)']" --recipe-option "newMethodName=containsKey" --recipe-option "matchOverrides=false"

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

mod config recipes jar install org.openrewrite:rewrite-java:8.50.2

See how this recipe works across multiple open-source repositories

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Data Tables

Source files that had results

org.openrewrite.table.SourcesFileResults

Source files that were modified by the recipe run.

Column Name	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 errored on a recipe

org.openrewrite.table.SourcesFileErrors

The details of all errors produced by a recipe run.

Column Name	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 Name	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	The total time spent across the scanning phase of this recipe.
99th percentile scanning time	99 out of 100 scans completed in this amount of time.
Max scanning time	The max time scanning any one source file.
Cumulative edit time	The total time spent across the editing phase of this recipe.
99th percentile edit time	99 out of 100 edits completed in this amount of time.
Max edit time	The max time editing any one source file.

Contributors

Jonathan Schneider, Tim te Beek, traceyyoshima, Joan Viladrosa, Jonathan Leitschuh