feat: style to reorder imports by Jackson code style

src/main/java/io/github/timoa/misc/JacksonImportStyle.java

@@ -0,0 +1,47 @@
+package io.github.timoa.misc;
+
+import org.openrewrite.java.style.ImportLayoutStyle;
+import org.openrewrite.java.style.TabsAndIndentsStyle;
+import org.openrewrite.style.NamedStyles;
+
+import java.util.Arrays;
+
+import static java.util.Collections.emptySet;
+import static org.openrewrite.Tree.randomId;
+
+public class JacksonImportStyle extends NamedStyles {
+    public JacksonImportStyle() {
+        super(randomId(),
+                "io.github.timoa.misc.JacksonImportStyle",
+                "custom style",
+                "custom style for the Jackson project",
+                emptySet(),
+                Arrays.asList(
+                        importLayout(),
+                        //needed so continuation indent, e.g. an `extends` on th next line is not modified.
+                        new TabsAndIndentsStyle(false, -2, -2, -2, false, null
+        )
+
+                ));
+    }
+
+    private static ImportLayoutStyle importLayout() {
+        return ImportLayoutStyle.builder()
+                .importPackage("java.*")
+                .blankLine()
+                .importAllOthers()
+                .blankLine()
+                .importPackage("com.fasterxml.jackson.annotation.*")
+                .blankLine()
+                .importPackage("com.fasterxml.jackson.core.*")
+                .importPackage("com.fasterxml.jackson.databind.*")
+                .importPackage("tools.jackson.*")//needed for master
+                .blankLine()
+                .importPackage("com.fasterxml.jackson.other.modules.*")
+                .blankLine()
+                .importStaticAllOthers()
+                .classCountToUseStarImport(Integer.MAX_VALUE)//disable collapsing imports to *
+                .build();
+    }
+
+}

src/test/java/io/github/timoa/misc/JacksonImportStyleTest.java

@@ -0,0 +1,157 @@
+package io.github.timoa.misc;
+
+import org.junit.jupiter.api.Test;
+import org.openrewrite.DocumentExample;
+import org.openrewrite.Issue;
+import org.openrewrite.java.JavaParser;
+import org.openrewrite.java.OrderImports;
+import org.openrewrite.test.RecipeSpec;
+import org.openrewrite.test.RewriteTest;
+
+import static java.util.Collections.singletonList;
+import static org.openrewrite.java.Assertions.java;
+
+class JacksonImportStyleTest implements RewriteTest {
+
+    @Override
+    public void defaults(RecipeSpec spec) {
+        spec.recipe(new OrderImports(false));
+    }
+
+    @DocumentExample
+    @Test
+    void simpleExample() {
+        rewriteRun(
+          spec -> spec.parser(JavaParser.fromJavaVersion().styles(
+            singletonList(
+              new JacksonImportStyle())
+            )),
+          java(
+            """
+              package com.fasterxml.jackson.core.write;
+              
+              import com.fasterxml.jackson.core.*;
+              
+              import java.io.*;
+              
+              import static org.junit.jupiter.api.Assertions.*;
+              
+              import org.junit.jupiter.api.Test;
+              
+              class Test {
+              }
+              """,
+            """
+              package com.fasterxml.jackson.core.write;
+              
+              import java.io.*;
+              
+              import org.junit.jupiter.api.Test;
+              
+              import com.fasterxml.jackson.core.*;
+              
+              import static org.junit.jupiter.api.Assertions.*;
+              
+              class Test {
+              }
+              """
+          )
+        );
+    }
+
+    @Test
+    void leaveNoGaps() {
+        rewriteRun(
+          spec -> spec.parser(JavaParser.fromJavaVersion().styles(
+            singletonList(
+              new JacksonImportStyle())
+          )),
+          java(
+            """
+              package com.fasterxml.jackson.core.write;
+
+              import com.fasterxml.jackson.core.*;
+              
+              import java.io.*;
+              
+              import static org.junit.jupiter.api.Assertions.*;
+              
+              import java.math.BigDecimal;
+              import java.math.BigInteger;
+              
+              import org.junit.jupiter.api.Test;
+
+              class GeneratorBasicDerivedTest {
+              }
+              """,
+            """
+              package com.fasterxml.jackson.core.write;
+              
+              import java.io.*;
+              import java.math.BigDecimal;
+              import java.math.BigInteger;
+              
+              import org.junit.jupiter.api.Test;
+              
+              import com.fasterxml.jackson.core.*;
+              
+              import static org.junit.jupiter.api.Assertions.*;
+              
+              class GeneratorBasicDerivedTest {
+              }
+              """
+          )
+        );
+    }
+
+    @Issue("https://github.com/openrewrite/rewrite/issues/4165")
+    @Test
+    // todo reactivate once the issue above is resolved
+    void shouldNotIndentExtends() {
+        rewriteRun(
+          spec -> spec.parser(JavaParser.fromJavaVersion().styles(
+            singletonList(
+              new JacksonImportStyle())
+          )),
+          java("class BaseClass {}"),
+          java(
+            """              
+              import static org.junit.jupiter.api.Assertions.*;
+
+              import java.io.*;
+              class Test
+                  extends BaseClass {
+              }
+              """,
+            """
+              import java.io.*;
+              
+              import static org.junit.jupiter.api.Assertions.*;
+              
+              class Test
+                  extends BaseClass {
+              }
+              """
+          ),
+          java(//different indentation here, just to be sure
+            """              
+              import static org.junit.jupiter.api.Assertions.*;
+
+              import java.io.*;
+              class Test2
+                    extends BaseClass {
+              }
+              """,
+            """
+              import java.io.*;
+              
+              import static org.junit.jupiter.api.Assertions.*;
+              
+              class Test2
+                    extends BaseClass {
+              }
+              """
+          )
+        );
+    }
+}