@SuppressWarnings({"rawtypes"})
  @java.lang.Override
  protected com.google.protobuf.MapFieldReflectionAccessor internalGetMapFieldReflection(
      int number) {
    switch (number) {
      case 7:
        return internalGetCustomMetadata();
      default:
        throw new RuntimeException("Invalid map field number: " + number);
    }
  }
<pre>
Describes options for object metadata update.
</pre>

Protobuf type {@code google.cloud.storagebatchoperations.v1.PutMetadata}
java-storagebatchoperations/proto-google-cloud-storagebatchoperations-v1/src/main/java/com/google/cloud/storagebatchoperations/v1/PutMetadata.java