Minor change to Helidon version handling allowing snapshot versions (O…

…penAPITools#19320)

* Minor change to Helidon version handling

Signed-off-by: Tim Quinn <tim.quinn@oracle.com>

* Update modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaHelidonCommonCodegen.java

Co-authored-by: martin-mfg <2026226+martin-mfg@users.noreply.github.com>

* Review comments: fix typo in comment

---------

Signed-off-by: Tim Quinn <tim.quinn@oracle.com>
Co-authored-by: martin-mfg <2026226+martin-mfg@users.noreply.github.com>

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/JavaHelidonCommonCodegen.java

@@ -483,7 +483,7 @@ private HashMap<String, String> loadKnownHttpStatusMap() {
     }
 
     private void setHelidonVersion(String version) {
-        helidonVersion = VersionUtil.instance().chooseVersion(version);
+        helidonVersion = VersionUtil.instance().chooseVersionBestMatchOrSelf(version);
         setParentVersion(helidonVersion);
         helidonMajorVersion = VersionUtil.majorVersion(helidonVersion);
     }
@@ -769,6 +769,30 @@ String chooseVersion(String requestedVersion) {
             return chooseVersion(requestedVersion, versions);
         }
 
+        /**
+         *  Returns either the best match version or, if there is none, the requested version itself to allow references to
+         * unpublished releases such as snapshots.
+         *
+         * @param requestedVersion version to search for
+         * @return either the best match or, if none, the requested version itself
+         */
+        String chooseVersionBestMatchOrSelf(String requestedVersion) {
+            return chooseVersionBestMatchOrSelf(requestedVersion, versions);
+        }
+
+        /**
+         * Returns either the best match version or, if there is none, the requested version itself to allow references to
+         * unpublished releases such as snapshots.
+         *
+         * @param requestedVersion version to search for
+         * @param candidateVersions releases to consider
+         * @return either the best match or, if none, the requested version itself
+         */
+        String chooseVersionBestMatchOrSelf(String requestedVersion, List<String> candidateVersions) {
+            String bestMatch = chooseVersion(requestedVersion, candidateVersions);
+            return bestMatch != null ? bestMatch : requestedVersion;
+        }
+
         /**
          * Returns the version that is the "closest" match to the requested version expression from among the provided
          * releases, where the expression expression is one of the following:

modules/openapi-generator/src/test/java/org/openapitools/codegen/languages/HelidonCommonCodegenTest.java

@@ -48,4 +48,10 @@ void testVersionNotInDefaultListWithNoNetwork() {
     }
 
 
+
+    @Test void checkUseOfUnpublishedRelease() {
+        assertThat(test.chooseVersionBestMatchOrSelf("4.0.11-SNAPSHOT",
+                                                     List.of("4.0.10", "3.2.1", "3.2.0", "2.0.4", "1.2.3", "1.2.2", "1.1.0")))
+                .isEqualTo("4.0.11-SNAPSHOT");
+    }
 }