new helper to reduce duplication

hauner · hauner · commit 58950147a7b1 · 2025-08-02T15:02:23.000+02:00
diff --git a/json-schema-validator/src/main/java/io/openapiprocessor/jsonschema/support/Types.java b/json-schema-validator/src/main/java/io/openapiprocessor/jsonschema/support/Types.java
@@ -65,6 +65,18 @@ public static Collection<Object> convertCollection (String path, @Nullable Objec
         return (Map<String, @Nullable Object>) o;
     }
 
+    /**
+     * Returns {@code o} as {@code @Nullable Map<String, @Nullable Object>} or null if it not a map.
+     * @param o the potential map
+     * @return the map or null if {@code o} is not a map
+     */
+    public static @Nullable Map<String, @Nullable Object> asObjectOrNull(@PolyNull Object o) {
+        if (!isObject(o))
+            return null;
+
+        return asObject(o);
+    }
+
     @SuppressWarnings ("unchecked")
     public static <T> @PolyNull Collection<@Nullable T> asCol (@PolyNull Object o) {
         return (Collection<@Nullable T>) o;
diff --git a/json-schema-validator/src/test/kotlin/io/openapiprocessor/jsonschema/support/TypesSpec.kt b/json-schema-validator/src/test/kotlin/io/openapiprocessor/jsonschema/support/TypesSpec.kt
@@ -31,4 +31,10 @@ class TypesSpec: StringSpec({
     "casts object to object" {
         asObject(emptyMap<String, String>() as Any).shouldNotBeNull()
     }
+
+    "check and cast to object" {
+        asObjectOrNull(null).shouldBeNull()
+        asObjectOrNull(emptyList<Any>()).shouldBeNull()
+        asObjectOrNull(emptyMap<String, Any>()).shouldNotBeNull()
+    }
 })
