@java.lang.Override
      public java.lang.String getDriveId() {
        java.lang.Object ref = "";
        if (driveSourceCase_ == 8) {
          ref = driveSource_;
        }
        if (!(ref instanceof java.lang.String)) {
          com.google.protobuf.ByteString bs = (com.google.protobuf.ByteString) ref;
          java.lang.String s = bs.toStringUtf8();
          if (driveSourceCase_ == 8) {
            driveSource_ = s;
          }
          return s;
        } else {
          return (java.lang.String) ref;
        }
      }
<pre>
The ID of the drive to download from.
</pre>

<code>string drive_id = 8;</code>

@return The driveId.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/SharePointSources.java