@java.lang.Override
  public final boolean isInitialized() {
    byte isInitialized = memoizedIsInitialized;
    if (isInitialized == 1) return true;
    if (isInitialized == 0) return false;

    memoizedIsInitialized = 1;
    return true;
  }
<pre>
Required. Google Cloud Storage location of glossary data.
File format is determined based on the filename extension. API returns
[google.rpc.Code.INVALID_ARGUMENT] for unsupported URI-s and file
formats. Wildcards are not allowed. This must be a single file in one of
the following formats:

For unidirectional glossaries:

- TSV/CSV (`.tsv`/`.csv`): Two column file, tab- or comma-separated.
  The first column is source text. The second column is target text.
  No headers in this file. The first row contains data and not column
  names.

- TMX (`.tmx`): TMX file with parallel data defining source/target term
pairs.

For equivalent term sets glossaries:

- CSV (`.csv`): Multi-column CSV file defining equivalent glossary terms
  in multiple languages. See documentation for more information -
  [glossaries](https://cloud.google.com/translate/docs/advanced/glossary).
</pre>

<code>.google.cloud.translation.v3.GcsSource gcs_source = 1;</code>
java-translate/proto-google-cloud-translate-v3/src/main/java/com/google/cloud/translate/v3/GlossaryInputConfig.java