@java.lang.Override
    public int getSerializedSize() {
      int size = memoizedSize;
      if (size != -1) return size;

      size = 0;
      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(usage_)) {
        size += com.google.protobuf.GeneratedMessageV3.computeStringSize(2, usage_);
      }
      if (sourceCase_ == 3) {
        size +=
            com.google.protobuf.CodedOutputStream.computeMessageSize(
                3, (com.google.cloud.translate.v3.GcsInputSource) source_);
      }
      size += getUnknownFields().getSerializedSize();
      memoizedSize = size;
      return size;
    }
<pre>
Google Cloud Storage file source.
</pre>

<code>.google.cloud.translation.v3.GcsInputSource gcs_source = 3;</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/DatasetInputConfig.java