Re-order factories to allow @JsonAdapter on enums which are user-defi…

…ned types.

gson/src/main/java/com/google/gson/Gson.java

@@ -232,13 +232,13 @@ public Gson() {
     factories.add(SqlDateTypeAdapter.FACTORY);
     factories.add(TypeAdapters.TIMESTAMP_FACTORY);
     factories.add(ArrayTypeAdapter.FACTORY);
-    factories.add(TypeAdapters.ENUM_FACTORY);
     factories.add(TypeAdapters.CLASS_FACTORY);
 
     // type adapters for composite and user-defined types
     factories.add(new CollectionTypeAdapterFactory(constructorConstructor));
     factories.add(new MapTypeAdapterFactory(constructorConstructor, complexMapKeySerialization));
     factories.add(new JsonAdapterAnnotationTypeAdapterFactory(constructorConstructor));
+    factories.add(TypeAdapters.ENUM_FACTORY);
     factories.add(new ReflectiveTypeAdapterFactory(
         constructorConstructor, fieldNamingPolicy, excluder));
 
@@ -410,7 +410,7 @@ public <T> TypeAdapter<T> getAdapter(TypeToken<T> type) {
    *  }</pre>
    *  Note that since you can not override type adapter factories for String and Java primitive
    *  types, our stats factory will not count the number of String or primitives that will be
-   *  read or written. 
+   *  read or written.
    * @param skipPast The type adapter factory that needs to be skipped while searching for
    *   a matching type adapter. In most cases, you should just pass <i>this</i> (the type adapter
    *   factory from where {@link #getDelegateAdapter} method is being invoked).

gson/src/test/java/com/google/gson/functional/JsonAdapterAnnotationOnClassesTest.java

@@ -33,6 +33,7 @@
 import com.google.gson.stream.JsonWriter;
 import java.io.IOException;
 import java.lang.reflect.Type;
+import java.util.Locale;
 import junit.framework.TestCase;
 
 /**
@@ -51,6 +52,11 @@ public void testJsonAdapterInvoked() {
     User user = gson.fromJson("{'name':'Joel Leitch'}", User.class);
     assertEquals("Joel", user.firstName);
     assertEquals("Leitch", user.lastName);
+
+    json = gson.toJson(Foo.BAR);
+    assertEquals("\"bar\"", json);
+    Foo baz = gson.fromJson("\"baz\"", Foo.class);
+    assertEquals(Foo.BAZ, baz);
   }
 
   public void testJsonAdapterFactoryInvoked() {
@@ -208,4 +214,15 @@ private static class UserJsonAdapter extends TypeAdapter<User> {
     }
   }
 
+  @JsonAdapter(FooJsonAdapter.class)
+  private static enum Foo { BAR, BAZ }
+  private static class FooJsonAdapter extends TypeAdapter<Foo> {
+    @Override public void write(JsonWriter out, Foo value) throws IOException {
+      out.value(value.name().toLowerCase(Locale.US));
+    }
+
+    @Override public Foo read(JsonReader in) throws IOException {
+      return Foo.valueOf(in.nextString().toUpperCase(Locale.US));
+    }
+  }
 }