private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vertexai.api.FileData,
            com.google.cloud.vertexai.api.FileData.Builder,
            com.google.cloud.vertexai.api.FileDataOrBuilder>
        getFileDataFieldBuilder() {
      if (fileDataBuilder_ == null) {
        if (!(dataCase_ == 3)) {
          data_ = com.google.cloud.vertexai.api.FileData.getDefaultInstance();
        }
        fileDataBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vertexai.api.FileData,
                com.google.cloud.vertexai.api.FileData.Builder,
                com.google.cloud.vertexai.api.FileDataOrBuilder>(
                (com.google.cloud.vertexai.api.FileData) data_, getParentForChildren(), isClean());
        data_ = null;
      }
      dataCase_ = 3;
      onChanged();
      return fileDataBuilder_;
    }
<pre>
Optional. URI based data.
</pre>

<code>
.google.cloud.vertexai.v1.FileData file_data = 3 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Part.java