public Builder setLanguagePair(
        com.google.cloud.translate.v3beta1.Glossary.LanguageCodePair value) {
      if (languagePairBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        languages_ = value;
        onChanged();
      } else {
        languagePairBuilder_.setMessage(value);
      }
      languagesCase_ = 3;
      return this;
    }
<pre>
Used with unidirectional glossaries.
</pre>

<code>.google.cloud.translation.v3beta1.Glossary.LanguageCodePair language_pair = 3;</code>
java-translate/proto-google-cloud-translate-v3beta1/src/main/java/com/google/cloud/translate/v3beta1/Glossary.java