private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.visionai.v1.AssetSource.AssetContentData,
            com.google.cloud.visionai.v1.AssetSource.AssetContentData.Builder,
            com.google.cloud.visionai.v1.AssetSource.AssetContentDataOrBuilder>
        getAssetContentDataFieldBuilder() {
      if (assetContentDataBuilder_ == null) {
        if (!(sourceFormCase_ == 2)) {
          sourceForm_ =
              com.google.cloud.visionai.v1.AssetSource.AssetContentData.getDefaultInstance();
        }
        assetContentDataBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.visionai.v1.AssetSource.AssetContentData,
                com.google.cloud.visionai.v1.AssetSource.AssetContentData.Builder,
                com.google.cloud.visionai.v1.AssetSource.AssetContentDataOrBuilder>(
                (com.google.cloud.visionai.v1.AssetSource.AssetContentData) sourceForm_,
                getParentForChildren(),
                isClean());
        sourceForm_ = null;
      }
      sourceFormCase_ = 2;
      onChanged();
      return assetContentDataBuilder_;
    }
<pre>
The source of the asset is from content bytes.
</pre>

<code>.google.cloud.visionai.v1.AssetSource.AssetContentData asset_content_data = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/AssetSource.java