public Builder clearSource() {
      sourceCase_ = 0;
      source_ = null;
      onChanged();
      return this;
    }
<pre>
The request message for ImportAssets.
</pre>

Protobuf type {@code google.cloud.visionai.v1.ImportAssetsRequest}
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/ImportAssetsRequest.java