From ab11ed6a272f5383394f7721428281dd9ddbc9e1 Mon Sep 17 00:00:00 2001
From: Goooler <wangzongler@gmail.com>
Date: Sat, 3 Oct 2026 20:25:01 +0800
Subject: [PATCH] Restore enum-compatible methods on JavaFormatterOptions.Style

`Style` was changed from an enum to a record, which removed the implicit
enum methods. Tools such as Spotless call `Style.valueOf(String)` to map
user configuration to a style, and fail with `NoSuchMethodError` against
the new version.
---
 .../java/JavaFormatterOptions.java            | 41 ++++++++++++++
 .../java/JavaFormatterOptionsTest.java        | 55 +++++++++++++++++++
 2 files changed, 96 insertions(+)
 create mode 100644 core/src/test/java/com/google/googlejavaformat/java/JavaFormatterOptionsTest.java

diff --git a/core/src/main/java/com/google/googlejavaformat/java/JavaFormatterOptions.java b/core/src/main/java/com/google/googlejavaformat/java/JavaFormatterOptions.java
index 65fcce4eb..d58aac4ea 100644
--- a/core/src/main/java/com/google/googlejavaformat/java/JavaFormatterOptions.java
+++ b/core/src/main/java/com/google/googlejavaformat/java/JavaFormatterOptions.java
@@ -66,6 +66,47 @@ public record Style(
     /** The AOSP-compliant configuration. */
     public static final Style AOSP = builder().aosp().build();
 
+    /**
+     * Returns the predefined styles, in the order they were declared when {@code Style} was an
+     * enum.
+     *
+     * <p>Retained for compatibility with callers compiled against the enum version of {@code
+     * Style}.
+     */
+    public static Style[] values() {
+      return new Style[] {GOOGLE, AOSP};
+    }
+
+    /**
+     * Returns the predefined style with the given name ({@code "GOOGLE"} or {@code "AOSP"}).
+     *
+     * <p>Retained for compatibility with callers compiled against the enum version of {@code
+     * Style}.
+     *
+     * @throws IllegalArgumentException if there is no predefined style with the given name
+     * @throws NullPointerException if {@code name} is null
+     */
+    public static Style valueOf(String name) {
+      return switch (requireNonNull(name, "Name is null")) {
+        case "GOOGLE" -> GOOGLE;
+        case "AOSP" -> AOSP;
+        default ->
+            throw new IllegalArgumentException(
+                "No enum constant " + Style.class.getCanonicalName() + "." + name);
+      };
+    }
+
+    /**
+     * Returns the name of the predefined style this style is based on ({@code "GOOGLE"} or {@code
+     * "AOSP"}), such that {@code valueOf(GOOGLE.name()) == GOOGLE}.
+     *
+     * <p>Retained for compatibility with callers compiled against the enum version of {@code
+     * Style}.
+     */
+    public String name() {
+      return importOrder().name();
+    }
+
     /**
      * Returns the visual column width of a tab stop.
      *
diff --git a/core/src/test/java/com/google/googlejavaformat/java/JavaFormatterOptionsTest.java b/core/src/test/java/com/google/googlejavaformat/java/JavaFormatterOptionsTest.java
new file mode 100644
index 000000000..b818337b8
--- /dev/null
+++ b/core/src/test/java/com/google/googlejavaformat/java/JavaFormatterOptionsTest.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2026 Google Inc.
+ *
+ * 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
+ *
+ *     http://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 com.google.googlejavaformat.java;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.Assert.assertThrows;
+
+import com.google.googlejavaformat.java.JavaFormatterOptions.Style;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for {@link JavaFormatterOptions}. */
+@RunWith(JUnit4.class)
+public final class JavaFormatterOptionsTest {
+
+  @Test
+  public void styleValues() {
+    assertThat(Style.values()).asList().containsExactly(Style.GOOGLE, Style.AOSP).inOrder();
+  }
+
+  @Test
+  public void styleValueOf() {
+    assertThat(Style.valueOf("GOOGLE")).isSameInstanceAs(Style.GOOGLE);
+    assertThat(Style.valueOf("AOSP")).isSameInstanceAs(Style.AOSP);
+  }
+
+  @Test
+  public void styleValueOf_invalid() {
+    assertThrows(IllegalArgumentException.class, () -> Style.valueOf("google"));
+    assertThrows(IllegalArgumentException.class, () -> Style.valueOf("PALANTIR"));
+    assertThrows(NullPointerException.class, () -> Style.valueOf(null));
+  }
+
+  @Test
+  public void styleName() {
+    for (Style style : Style.values()) {
+      assertThat(Style.valueOf(style.name())).isSameInstanceAs(style);
+    }
+    assertThat(Style.AOSP.toBuilder().maxLineLength(120).useTabs(true).build().name())
+        .isEqualTo("AOSP");
+  }
+}