Start implementing unlessUsing property

src/main/java/org/openrewrite/java/dependencies/RemoveDependency.java

@@ -24,32 +24,37 @@
 import java.util.Arrays;
 import java.util.List;
 
+import static java.util.Collections.emptyList;
 
 @Value
 @EqualsAndHashCode(callSuper = false)
 public class RemoveDependency extends Recipe {
     @Option(displayName = "Group ID",
-        description = "The first part of a dependency coordinate `com.google.guava:guava:VERSION`. This can be a glob expression.",
-        example = "com.fasterxml.jackson*")
+            description = "The first part of a dependency coordinate `com.google.guava:guava:VERSION`. This can be a glob expression.",
+            example = "com.fasterxml.jackson*")
     String groupId;
 
     @Option(displayName = "Artifact ID",
-        description = "The second part of a dependency coordinate `com.google.guava:guava:VERSION`. This can be a glob expression.",
-        example = "jackson-module*")
+            description = "The second part of a dependency coordinate `com.google.guava:guava:VERSION`. This can be a glob expression.",
+            example = "jackson-module*")
     String artifactId;
 
+    @Option(displayName = "Unless using", description = "If a dependency is used in the code, do not remove it.")
+    @Nullable
+    Boolean unlessUsing;
+
     // Gradle only parameter
     @Option(displayName = "The dependency configuration", description = "The dependency configuration to remove from.", example = "api", required = false)
     @Nullable
     String configuration;
 
     // Maven only parameter
     @Option(displayName = "Scope",
-        description = "Only remove dependencies if they are in this scope. If 'runtime', this will" +
-                      "also remove dependencies in the 'compile' scope because 'compile' dependencies are part of the runtime dependency set",
-        valid = {"compile", "test", "runtime", "provided"},
-        example = "compile",
-        required = false)
+            description = "Only remove dependencies if they are in this scope. If 'runtime', this will" +
+                    "also remove dependencies in the 'compile' scope because 'compile' dependencies are part of the runtime dependency set",
+            valid = {"compile", "test", "runtime", "provided"},
+            example = "compile",
+            required = false)
     @Nullable
     String scope;
 
@@ -61,20 +66,22 @@ public String getDisplayName() {
     @Override
     public String getDescription() {
         return "For Gradle project, removes a single dependency from the dependencies section of the `build.gradle`.\n" +
-               "For Maven project, removes a single dependency from the <dependencies> section of the pom.xml.";
+                "For Maven project, removes a single dependency from the <dependencies> section of the pom.xml.";
     }
 
     org.openrewrite.gradle.@Nullable RemoveDependency removeGradleDependency;
 
     org.openrewrite.maven.@Nullable RemoveDependency removeMavenDependency;
 
     public RemoveDependency(
-        String groupId,
-        String artifactId,
-        @Nullable String configuration,
-        @Nullable String scope) {
+            String groupId,
+            String artifactId,
+            @Nullable Boolean unlessUsing,
+            @Nullable String configuration,
+            @Nullable String scope) {
         this.groupId = groupId;
         this.artifactId = artifactId;
+        this.unlessUsing = unlessUsing;
         this.configuration = configuration;
         this.scope = scope;
         removeGradleDependency = new org.openrewrite.gradle.RemoveDependency(groupId, artifactId, configuration);
@@ -83,6 +90,10 @@ public RemoveDependency(
 
     @Override
     public List<Recipe> getRecipeList() {
+        if (Boolean.TRUE.equals(unlessUsing)) {
+            // logic to check if code uses the lib, if so ->
+            return emptyList();
+        }
         return Arrays.asList(removeGradleDependency, removeMavenDependency);
     }
 }

src/test/java/org/openrewrite/java/dependencies/RemoveDependencyTest.java

@@ -30,18 +30,18 @@ class RemoveDependencyTest implements RewriteTest {
     void removeGradleDependencyUsingStringNotationWithExclusion() {
         rewriteRun(
           spec -> spec.beforeRecipe(withToolingApi())
-            .recipe(new RemoveDependency("org.springframework.boot", "spring-boot*", null, null)),
+            .recipe(new RemoveDependency("org.springframework.boot", "spring-boot*", false, null, null)),
           //language=groovy
           buildGradle(
             """
               plugins {
                   id 'java-library'
               }
-                            
+
               repositories {
                   mavenCentral()
               }
-                            
+
               dependencies {
                   implementation("org.springframework.boot:spring-boot-starter-web:2.7.0") {
                       exclude group: "junit"
@@ -53,11 +53,11 @@ void removeGradleDependencyUsingStringNotationWithExclusion() {
               plugins {
                   id 'java-library'
               }
-                            
+
               repositories {
                   mavenCentral()
               }
-                            
+
               dependencies {
                   testImplementation "org.junit.vintage:junit-vintage-engine:5.6.2"
               }
@@ -70,17 +70,17 @@ void removeGradleDependencyUsingStringNotationWithExclusion() {
     @Test
     void removeMavenDependency() {
         rewriteRun(
-          spec -> spec.recipe(new RemoveDependency("junit", "junit", null, null)),
+          spec -> spec.recipe(new RemoveDependency("junit", "junit", false, null, null)),
           //language=xml
           pomXml(
             """
               <project>
                 <modelVersion>4.0.0</modelVersion>
-                
+
                 <groupId>com.mycompany.app</groupId>
                 <artifactId>my-app</artifactId>
                 <version>1</version>
-                
+
                 <dependencies>
                   <dependency>
                     <groupId>com.google.guava</groupId>
@@ -99,11 +99,11 @@ void removeMavenDependency() {
             """
               <project>
                 <modelVersion>4.0.0</modelVersion>
-                
+
                 <groupId>com.mycompany.app</groupId>
                 <artifactId>my-app</artifactId>
                 <version>1</version>
-                
+
                 <dependencies>
                   <dependency>
                     <groupId>com.google.guava</groupId>
@@ -116,4 +116,31 @@ void removeMavenDependency() {
           )
         );
     }
+
+    @Test
+    void doNotRemoveDependencyIfItIsUsedAndUnlessUsingIsTrue() {
+        rewriteRun(
+          spec -> spec.beforeRecipe(withToolingApi())
+            .recipe(new RemoveDependency("org.springframework.boot", "spring-boot*", true, null, null)),
+          //language=groovy
+          buildGradle(
+            """
+              plugins {
+                  id 'java-library'
+              }
+              
+              repositories {
+                  mavenCentral()
+              }
+
+              dependencies {
+                  implementation("org.springframework.boot:spring-boot-starter-web:2.7.0") {
+                      exclude group: "junit"
+                  }
+                  testImplementation "org.junit.vintage:junit-vintage-engine:5.6.2"
+              }
+              """
+          )
+        );
+    }
 }