public com.google.cloud.vision.v1p1beta1.ImageSource getSource() {
      if (sourceBuilder_ == null) {
        return source_ == null
            ? com.google.cloud.vision.v1p1beta1.ImageSource.getDefaultInstance()
            : source_;
      } else {
        return sourceBuilder_.getMessage();
      }
    }
<pre>
Google Cloud Storage image location. If both `content` and `source`
are provided for an image, `content` takes precedence and is
used to perform the image annotation request.
</pre>

<code>.google.cloud.vision.v1p1beta1.ImageSource source = 2;</code>

@return The source.
java-vision/proto-google-cloud-vision-v1p1beta1/src/main/java/com/google/cloud/vision/v1p1beta1/Image.java