public Builder mergeFrom(
          com.google.cloud.translate.v3.AdaptiveMtTranslateRequest.ReferenceSentenceConfig other) {
        if (other
            == com.google.cloud.translate.v3.AdaptiveMtTranslateRequest.ReferenceSentenceConfig
                .getDefaultInstance()) return this;
        if (referenceSentencePairListsBuilder_ == null) {
          if (!other.referenceSentencePairLists_.isEmpty()) {
            if (referenceSentencePairLists_.isEmpty()) {
              referenceSentencePairLists_ = other.referenceSentencePairLists_;
              bitField0_ = (bitField0_ & ~0x00000001);
            } else {
              ensureReferenceSentencePairListsIsMutable();
              referenceSentencePairLists_.addAll(other.referenceSentencePairLists_);
            }
            onChanged();
          }
        } else {
          if (!other.referenceSentencePairLists_.isEmpty()) {
            if (referenceSentencePairListsBuilder_.isEmpty()) {
              referenceSentencePairListsBuilder_.dispose();
              referenceSentencePairListsBuilder_ = null;
              referenceSentencePairLists_ = other.referenceSentencePairLists_;
              bitField0_ = (bitField0_ & ~0x00000001);
              referenceSentencePairListsBuilder_ =
                  com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders
                      ? getReferenceSentencePairListsFieldBuilder()
                      : null;
            } else {
              referenceSentencePairListsBuilder_.addAllMessages(other.referenceSentencePairLists_);
            }
          }
        }
        if (!other.getSourceLanguageCode().isEmpty()) {
          sourceLanguageCode_ = other.sourceLanguageCode_;
          bitField0_ |= 0x00000002;
          onChanged();
        }
        if (!other.getTargetLanguageCode().isEmpty()) {
          targetLanguageCode_ = other.targetLanguageCode_;
          bitField0_ |= 0x00000004;
          onChanged();
        }
        this.mergeUnknownFields(other.getUnknownFields());
        onChanged();
        return this;
      }
<pre>
Message of caller-provided reference configuration.
</pre>

Protobuf type {@code
google.cloud.translation.v3.AdaptiveMtTranslateRequest.ReferenceSentenceConfig}
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/AdaptiveMtTranslateRequest.java