diff --git a/src/main/java/org/openrewrite/java/migrate/lombok/UseNoArgsConstructor.java b/src/main/java/org/openrewrite/java/migrate/lombok/UseNoArgsConstructor.java new file mode 100644 index 0000000000..6300414109 --- /dev/null +++ b/src/main/java/org/openrewrite/java/migrate/lombok/UseNoArgsConstructor.java @@ -0,0 +1,82 @@ +/* + * Copyright 2025 the original author or authors. + *
+ * Licensed under the Moderne Source Available License (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + *
+ * https://docs.moderne.io/licensing/moderne-source-available-license + *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.openrewrite.java.migrate.lombok;
+
+import lombok.AccessLevel;
+import lombok.EqualsAndHashCode;
+import lombok.Value;
+import org.jspecify.annotations.Nullable;
+import org.openrewrite.ExecutionContext;
+import org.openrewrite.Recipe;
+import org.openrewrite.TreeVisitor;
+import org.openrewrite.java.JavaIsoVisitor;
+import org.openrewrite.java.JavaParser;
+import org.openrewrite.java.JavaTemplate;
+import org.openrewrite.java.tree.J;
+import org.openrewrite.java.tree.TypeUtils;
+
+import static java.util.Comparator.comparing;
+
+@Value
+@EqualsAndHashCode(callSuper = false)
+public class UseNoArgsConstructor extends Recipe {
+
+ @Override
+ public String getDisplayName() {
+ //language=markdown
+ return "Use `@NoArgsConstructor` where applicable";
+ }
+
+ @Override
+ public String getDescription() {
+ //language=markdown
+ return "Prefer the Lombok `@NoArgsConstructor` annotation over explicitly written out constructors.";
+ }
+
+ @Override
+ public TreeVisitor, ExecutionContext> getVisitor() {
+ return new JavaIsoVisitor
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.openrewrite.java.migrate.lombok;
+
+import org.junit.jupiter.api.Test;
+import org.openrewrite.DocumentExample;
+import org.openrewrite.test.RecipeSpec;
+import org.openrewrite.test.RewriteTest;
+
+import static org.openrewrite.java.Assertions.java;
+
+class UseNoArgsConstructorTest implements RewriteTest {
+
+ @Override
+ public void defaults(RecipeSpec spec) {
+ spec.recipe(new UseNoArgsConstructor());
+ }
+
+ @DocumentExample
+ @Test
+ void replaceEmptyPublicConstructor() {
+ rewriteRun(// language=java
+ java(
+ """
+ class A {
+ public A() {}
+ }
+ """,
+ """
+ import lombok.NoArgsConstructor;
+
+ @NoArgsConstructor
+ class A {
+ }
+ """
+ )
+ );
+ }
+
+ @Test
+ void keepNonEmptyPublicConstructor() {
+ rewriteRun(
+ //language=java
+ java(
+ """
+ class A {
+
+ int foo;
+
+ public A() {
+ foo = 7;
+ }
+ }
+ """
+ )
+ );
+ }
+
+ @Test
+ void replaceEmptyProtectedConstructor() {
+ rewriteRun(
+ //language=java
+ java(
+ """
+ class A {
+ protected A() {}
+ }
+ """,
+ """
+ import lombok.AccessLevel;
+ import lombok.NoArgsConstructor;
+
+ @NoArgsConstructor(access = AccessLevel.PROTECTED)
+ class A {
+ }
+ """
+ )
+ );
+ }
+
+ @Test
+ void replaceEmptyPrivateConstructor() {
+ rewriteRun(
+ //language=java
+ java(
+ """
+ class A {
+ private A() {}
+ }
+ """,
+ """
+ import lombok.AccessLevel;
+ import lombok.NoArgsConstructor;
+
+ @NoArgsConstructor(access = AccessLevel.PRIVATE)
+ class A {
+ }
+ """
+ )
+ );
+ }
+
+ @Test
+ void replaceEmptyPackageConstructor() {
+ rewriteRun(
+ //language=java
+ java(
+ """
+ class A {
+ A() {}
+ }
+ """,
+ """
+ import lombok.AccessLevel;
+ import lombok.NoArgsConstructor;
+
+ @NoArgsConstructor(access = AccessLevel.PACKAGE)
+ class A {
+ }
+ """
+ )
+ );
+ }
+
+}