Remove Enums from guava-gwt at compile time.

Previously, parts of it were present but failed at runtime when used under J2CL. And soon, J2CL may drop support for the reflective enum-related APIs that it depends on.

`guava-gwt` is used by both GWT and J2CL users, so we have to keep our code buildable against both.

If this CL causes trouble for you as a GWT user, let us know, and we can investigate options further. In the worst case, you can copy the implementations as needed, since the class contains only static methods.

RELNOTES=`collect`: Removed `Enums` from `guava-gwt` to prepare for the removal of reflective enum-related APIs from J2CL. If this causes you problems as a GWT user, let us know.
PiperOrigin-RevId: 535585561

Author: cpovirk

android/guava-tests/test/com/google/common/base/EnumsTest.java

@@ -20,7 +20,6 @@
 import static com.google.common.base.StandardSystemProperty.PATH_SEPARATOR;
 import static com.google.common.truth.Truth.assertThat;
 
-import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
 import com.google.common.collect.ImmutableList;
@@ -45,7 +44,7 @@
  *
  * @author Steve McKay
  */
-@GwtCompatible(emulated = true)
+@GwtIncompatible
 @J2ktIncompatible
 public class EnumsTest extends TestCase {
 
@@ -117,6 +116,7 @@ private WeakReference<?> doTestClassUnloading() throws Exception {
     return new WeakReference<>(shadowLoader);
   }
 
+  @GwtIncompatible // stringConverter
   public void testStringConverter_convert() {
     Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
     assertEquals(TestEnum.CHEETO, converter.convert("CHEETO"));
@@ -126,6 +126,7 @@ public void testStringConverter_convert() {
     assertNull(converter.reverse().convert(null));
   }
 
+  @GwtIncompatible // stringConverter
   public void testStringConverter_convertError() {
     Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
     try {
@@ -135,6 +136,7 @@ public void testStringConverter_convertError() {
     }
   }
 
+  @GwtIncompatible // stringConverter
   public void testStringConverter_reverse() {
     Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
     assertEquals("CHEETO", converter.reverse().convert(TestEnum.CHEETO));
@@ -143,13 +145,14 @@ public void testStringConverter_reverse() {
   }
 
   @J2ktIncompatible
-  @GwtIncompatible // NullPointerTester
+  @GwtIncompatible // stringConverter
   public void testStringConverter_nullPointerTester() throws Exception {
     Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
     NullPointerTester tester = new NullPointerTester();
     tester.testAllPublicInstanceMethods(converter);
   }
 
+  @GwtIncompatible // stringConverter
   public void testStringConverter_nullConversions() {
     Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
     assertNull(converter.convert(null));
@@ -164,6 +167,7 @@ public void testStringConverter_toString() {
         Enums.stringConverter(TestEnum.class).toString());
   }
 
+  @GwtIncompatible // stringConverter
   public void testStringConverter_serialization() {
     SerializableTester.reserializeAndAssert(Enums.stringConverter(TestEnum.class));
   }

android/guava/src/com/google/common/base/Enums.java

@@ -16,7 +16,6 @@
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
-import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
 import java.io.Serializable;
@@ -34,7 +33,7 @@
  * @author Steve McKay
  * @since 9.0
  */
-@GwtCompatible(emulated = true)
+@GwtIncompatible
 @J2ktIncompatible
 @ElementTypesAreNonnullByDefault
 public final class Enums {
@@ -108,10 +107,12 @@ static <T extends Enum<T>> Map<String, WeakReference<? extends Enum<?>>> getEnum
    *
    * @since 16.0
    */
+  @GwtIncompatible
   public static <T extends Enum<T>> Converter<String, T> stringConverter(Class<T> enumClass) {
     return new StringConverter<>(enumClass);
   }
 
+  @GwtIncompatible
   private static final class StringConverter<T extends Enum<T>> extends Converter<String, T>
       implements Serializable {
 

guava-gwt/src-super/com/google/common/base/super/com/google/common/base/Platform.java

@@ -32,14 +32,6 @@ static CharMatcher precomputeCharMatcher(CharMatcher matcher) {
     return matcher;
   }
 
-  static <T extends Enum<T>> Optional<T> getEnumIfPresent(Class<T> enumClass, String value) {
-    try {
-      return Optional.of(Enum.valueOf(enumClass, value));
-    } catch (IllegalArgumentException iae) {
-      return Optional.absent();
-    }
-  }
-
   static String formatCompact4Digits(double value) {
     return "" + ((Number) (Object) value).toPrecision(4);
   }

guava-tests/test/com/google/common/base/EnumsTest.java

@@ -20,7 +20,6 @@
 import static com.google.common.base.StandardSystemProperty.PATH_SEPARATOR;
 import static com.google.common.truth.Truth.assertThat;
 
-import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
 import com.google.common.collect.ImmutableList;
@@ -45,7 +44,7 @@
  *
  * @author Steve McKay
  */
-@GwtCompatible(emulated = true)
+@GwtIncompatible
 @J2ktIncompatible
 public class EnumsTest extends TestCase {
 
@@ -117,6 +116,7 @@ private WeakReference<?> doTestClassUnloading() throws Exception {
     return new WeakReference<>(shadowLoader);
   }
 
+  @GwtIncompatible // stringConverter
   public void testStringConverter_convert() {
     Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
     assertEquals(TestEnum.CHEETO, converter.convert("CHEETO"));
@@ -126,6 +126,7 @@ public void testStringConverter_convert() {
     assertNull(converter.reverse().convert(null));
   }
 
+  @GwtIncompatible // stringConverter
   public void testStringConverter_convertError() {
     Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
     try {
@@ -135,6 +136,7 @@ public void testStringConverter_convertError() {
     }
   }
 
+  @GwtIncompatible // stringConverter
   public void testStringConverter_reverse() {
     Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
     assertEquals("CHEETO", converter.reverse().convert(TestEnum.CHEETO));
@@ -143,13 +145,14 @@ public void testStringConverter_reverse() {
   }
 
   @J2ktIncompatible
-  @GwtIncompatible // NullPointerTester
+  @GwtIncompatible // stringConverter
   public void testStringConverter_nullPointerTester() throws Exception {
     Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
     NullPointerTester tester = new NullPointerTester();
     tester.testAllPublicInstanceMethods(converter);
   }
 
+  @GwtIncompatible // stringConverter
   public void testStringConverter_nullConversions() {
     Converter<String, TestEnum> converter = Enums.stringConverter(TestEnum.class);
     assertNull(converter.convert(null));
@@ -164,6 +167,7 @@ public void testStringConverter_toString() {
         Enums.stringConverter(TestEnum.class).toString());
   }
 
+  @GwtIncompatible // stringConverter
   public void testStringConverter_serialization() {
     SerializableTester.reserializeAndAssert(Enums.stringConverter(TestEnum.class));
   }

guava/src/com/google/common/base/Enums.java

@@ -16,7 +16,6 @@
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
-import com.google.common.annotations.GwtCompatible;
 import com.google.common.annotations.GwtIncompatible;
 import com.google.common.annotations.J2ktIncompatible;
 import java.io.Serializable;
@@ -34,7 +33,7 @@
  * @author Steve McKay
  * @since 9.0
  */
-@GwtCompatible(emulated = true)
+@GwtIncompatible
 @J2ktIncompatible
 @ElementTypesAreNonnullByDefault
 public final class Enums {
@@ -108,10 +107,12 @@ static <T extends Enum<T>> Map<String, WeakReference<? extends Enum<?>>> getEnum
    *
    * @since 16.0
    */
+  @GwtIncompatible
   public static <T extends Enum<T>> Converter<String, T> stringConverter(Class<T> enumClass) {
     return new StringConverter<>(enumClass);
   }
 
+  @GwtIncompatible
   private static final class StringConverter<T extends Enum<T>> extends Converter<String, T>
       implements Serializable {