Add support for EDITIONS in Java and Java Lite syntax enum / bits.

PiperOrigin-RevId: 555522301

java/core/src/main/java/com/google/protobuf/DescriptorMessageInfoFactory.java

@@ -129,6 +129,8 @@ final class DescriptorMessageInfoFactory implements MessageInfoFactory {
         return ProtoSyntax.PROTO2;
       case PROTO3:
         return ProtoSyntax.PROTO3;
+      case EDITIONS:
+        return ProtoSyntax.EDITIONS;
       default:
         throw new IllegalArgumentException("Unsupported syntax: " + syntax);
     }

java/core/src/main/java/com/google/protobuf/Descriptors.java

@@ -167,7 +167,8 @@ public final class Descriptors {
     enum Syntax {
       UNKNOWN("unknown"),
       PROTO2("proto2"),
-      PROTO3("proto3");
+      PROTO3("proto3"),
+      EDITIONS("editions");
 
       Syntax(String name) {
         this.name = name;
@@ -182,16 +183,27 @@ public final class Descriptors {
     Syntax getSyntax() {
       if (Syntax.PROTO3.name.equals(proto.getSyntax())) {
         return Syntax.PROTO3;
+      } else if (Syntax.EDITIONS.name.equals(proto.getSyntax())) {
+        return Syntax.EDITIONS;
       }
       return Syntax.PROTO2;
     }
 
+    /** Get the edition of the .proto file. */
+    public String getEdition() {
+      return proto.getEdition();
+    }
+
     public void copyHeadingTo(FileDescriptorProto.Builder protoBuilder) {
       protoBuilder.setName(getName()).setSyntax(getSyntax().name);
       if (!getPackage().isEmpty()) {
         protoBuilder.setPackage(getPackage());
       }
 
+      if (getSyntax().equals(Syntax.EDITIONS)) {
+        protoBuilder.setEdition(getEdition());
+      }
+
       if (!getOptions().equals(FileOptions.getDefaultInstance())) {
         protoBuilder.setOptions(getOptions());
       }

java/core/src/main/java/com/google/protobuf/ProtoSyntax.java

@@ -34,5 +34,6 @@ package com.google.protobuf;
 @ExperimentalApi
 public enum ProtoSyntax {
   PROTO2,
-  PROTO3;
+  PROTO3,
+  EDITIONS;
 }

java/core/src/main/java/com/google/protobuf/RawMessageInfo.java

@@ -37,6 +37,7 @@ package com.google.protobuf;
 @CheckReturnValue
 final class RawMessageInfo implements MessageInfo {
   private static final int IS_PROTO2_BIT = 0x1;
+  private static final int IS_EDITION_BIT = 0x4;
 
   private final MessageLite defaultInstance;
 
@@ -61,7 +62,8 @@ final class RawMessageInfo implements MessageInfo {
    * <p>The integer sequence encoded in the String object has the following layout:
    *
    * <ul>
-   *   <li>[0]: flags, flags & 0x1 = is proto2?, flags & 0x2 = is message?
+   *   <li>[0]: flags, flags & 0x1 = is proto2?, flags & 0x2 = is message?, flags & 0x4 = is
+   *       edition?
    *   <li>[1]: field count, if 0, this is the end of the integer sequence and the corresponding
    *       Object[] array should be null.
    *   <li>[2]: oneof count
@@ -215,6 +217,8 @@ final class RawMessageInfo implements MessageInfo {
   public ProtoSyntax getSyntax() {
     if ((flags & IS_PROTO2_BIT) != 0) {
       return ProtoSyntax.PROTO2;
+    } else if ((flags & IS_EDITION_BIT) == 0x4) {
+      return ProtoSyntax.EDITIONS;
     } else {
       return ProtoSyntax.PROTO3;
     }

src/google/protobuf/compiler/java/message_lite.cc

@@ -515,6 +515,11 @@ void ImmutableMessageLiteGenerator::GenerateDynamicMethodNewBuildMessageInfo(
   if (descriptor_->options().message_set_wire_format()) {
     flags |= 0x2;
   }
+  if (FileDescriptorLegacy(descriptor_->file()).syntax() ==
+      FileDescriptorLegacy::Syntax::SYNTAX_EDITIONS) {
+    flags |= 0x4;
+  }
+
   WriteIntToUtf16CharSequence(flags, &chars);
   WriteIntToUtf16CharSequence(descriptor_->field_count(), &chars);