private void addLambdaCodeURI(JsonNode resources) {
    for (Entry<String, File> function : lambdaFunctions.entrySet()) {
      TextNode codeUri = new TextNode(function.getValue().getAbsolutePath());

      ObjectNode apiProperties = (ObjectNode) resources.get(function.getKey()).get("Properties");
      apiProperties.set("CodeUri", codeUri);
    }
  }
Register an API Gateway API that should have its DefinitionBody property updated in the
Cloudformation template

@param ref the Cloudformation Ref of the API to update
@param swagger the file containing the swagger definition of the API
buildSrc/src/main/java/com/amazonaws/blox/tasks/PostProcessCloudformation.java