public Builder mergeAssetSource(com.google.cloud.visionai.v1.AssetSource value) {
      if (assetSourceBuilder_ == null) {
        if (((bitField0_ & 0x00000002) != 0)
            && assetSource_ != null
            && assetSource_ != com.google.cloud.visionai.v1.AssetSource.getDefaultInstance()) {
          getAssetSourceBuilder().mergeFrom(value);
        } else {
          assetSource_ = value;
        }
      } else {
        assetSourceBuilder_.mergeFrom(value);
      }
      if (assetSource_ != null) {
        bitField0_ |= 0x00000002;
        onChanged();
      }
      return this;
    }
<pre>
The source of the asset.
</pre>

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