[CDSADAPTERS-2186] Fixed openapi filename issue when there's only one service in the CDL source (#59)

* Fixed openapi filename issue when there's only one service in the CDL source file

* Update test cases to handle generator function in openAPI

* Add changelog entry

Author: Dipto-at-sap

CHANGELOG.md

@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
+
+### Fixed
+
+- Fixed the filename issue: when there is only one service in the CDL source, the OpenAPI document is now generated with the filename corresponding to the service name rather than the CDL source filename.
+
 ## Version 1.1.1 - 13.12.2024
 
 ### Fixed
@@ -38,6 +43,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
 - OpenAPI documents can now have `externalDocs` object provided through `@OpenAPI.externalDocs` annotation in the service level of CDS.
 - OpenAPI documents now throws warning if `securitySchemas` are not found.
+- Introduced --openapi:config-file option to incorporate all the options for cds compile command in a JSON configuration file, inline options take precedence over those defined in the configuration file.
 
 ## Version 1.0.6 - 23.09.2024
 
@@ -90,4 +96,3 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/).
 ### Added
 
 - Initial release
-- Introduced --openapi:config-file option to incorporate all the options for cds compile command in a JSON configuration file, inline options take precedence over those defined in the configuration file.

lib/compile/index.js

@@ -20,10 +20,6 @@ module.exports = function processor(csn, options = {}) {
     openApiDocs = _getOpenApi(csdl, openApiOptions);
   }
 
-  if (Object.keys(openApiDocs).length == 1) {
-    return openApiDocs[Object.keys(openApiDocs)[0]];
-  }
-
   return _iterate(openApiDocs);
 }
 
@@ -50,6 +46,12 @@ function* _iterate(openApiDocs) {
   }
 }
 
+function nameParts(qualifiedName) {
+  const pos = qualifiedName.lastIndexOf('.');
+  console.assert(pos > 0, 'Invalid qualified name ' + qualifiedName);
+  return qualifiedName.substring(0, pos);
+}
+
 function _getOpenApi(csdl, options, serviceName = "") {
   const openApiDocs = {};
   let filename;
@@ -68,6 +70,10 @@ function _getOpenApi(csdl, options, serviceName = "") {
 
     const openapi = csdl2openapi.csdl2openapi(csdl, sOptions);
 
+    if(!serviceName) {
+      serviceName= nameParts(csdl.$EntityContainer);
+    }
+
     if (protocols.length > 1) {
       filename = serviceName + "." + protocol;
     } else {