fix: [OpenAPI] Correct @Nullable on inner enum fromValue(String) methods

datamodel/openapi/openapi-generator/src/main/resources/openapi-generator/mustache-templates/modelInnerEnum.mustache

@@ -65,7 +65,7 @@
 {{#jackson}}
     @JsonCreator
 {{/jackson}}
-    @Nonnull public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue(@Nonnull final {{{dataType}}} value) {
+    {{#isNullable}}@Nullable{{/isNullable}}{{^isNullable}}@Nonnull{{/isNullable}} public static {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} fromValue(@Nonnull final {{{dataType}}} value) {
       for ({{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}} b : {{{datatypeWithEnum}}}{{^datatypeWithEnum}}{{{classname}}}{{/datatypeWithEnum}}.values()) {
         if (b.value.{{^isString}}equals{{/isString}}{{#isString}}{{#useEnumCaseInsensitive}}equalsIgnoreCase{{/useEnumCaseInsensitive}}{{^useEnumCaseInsensitive}}equals{{/useEnumCaseInsensitive}}{{/isString}}(value)) {
           return b;

datamodel/openapi/openapi-generator/src/test/resources/DataModelGeneratorIntegrationTest/api-class-for-ai-sdk/input/sodastore.json

@@ -179,6 +179,11 @@
             "type": "number",
             "format": "float"
           },
+          "diet": {
+            "type": "string",
+            "enum": ["sugar", "zero", "light"],
+            "nullable": true
+          },
           "embedding":{
             "type": "array",
             "items": {

datamodel/openapi/openapi-generator/src/test/resources/DataModelGeneratorIntegrationTest/api-class-for-ai-sdk/output/com/sap/cloud/sdk/services/builder/model/Soda.java

@@ -63,6 +63,68 @@ public class Soda
   @JsonProperty("price")
   private Float price;
 
+  /**
+   * Gets or Sets diet
+   */
+  public enum DietEnum {
+    /**
+    * The SUGAR option of this Soda
+    */
+    SUGAR("sugar"),
+
+    /**
+    * The ZERO option of this Soda
+    */
+    ZERO("zero"),
+
+    /**
+    * The LIGHT option of this Soda
+    */
+    LIGHT("light");
+
+    private String value;
+
+    DietEnum(String value) {
+      this.value = value;
+    }
+
+    /**
+    * Get the value of the enum
+    * @return The enum value
+    */
+    @JsonValue
+    @Nonnull public String getValue() {
+      return value;
+    }
+
+    /**
+    * Get the String value of the enum value.
+    * @return The enum value as String
+    */
+    @Override
+    @Nonnull public String toString() {
+      return String.valueOf(value);
+    }
+
+    /**
+    * Get the enum value from a String value
+    * @param value The String value
+    * @return The enum value of type Soda
+    */
+    @JsonCreator
+    @Nullable public static DietEnum fromValue(@Nonnull final String value) {
+      for (DietEnum b : DietEnum.values()) {
+        if (b.value.equals(value)) {
+          return b;
+        }
+      }
+      return null;
+    }
+  }
+
+  @JsonProperty("diet")
+  private DietEnum diet;
+
   @JsonProperty("embedding")
   private float[] embedding;
 
@@ -244,6 +306,35 @@ public void setPrice( @Nonnull final Float price) {
     this.price = price;
   }
 
+  /**
+   * Set the diet of this {@link Soda} instance and return the same instance.
+   *
+   * @param diet  The diet of this {@link Soda}
+   * @return The same instance of this {@link Soda} class
+   */
+  @Nonnull public Soda diet( @Nullable final DietEnum diet) {
+    this.diet = diet;
+    return this;
+  }
+
+  /**
+   * Get diet
+   * @return diet  The diet of this {@link Soda} instance.
+   */
+  @Nullable
+  public DietEnum getDiet() {
+    return diet;
+  }
+
+  /**
+   * Set the diet of this {@link Soda} instance.
+   *
+   * @param diet  The diet of this {@link Soda}
+   */
+  public void setDiet( @Nullable final DietEnum diet) {
+    this.diet = diet;
+  }
+
   /**
    * Set the embedding of this {@link Soda} instance and return the same instance.
    *
@@ -315,6 +406,7 @@ public Map<String, Object> toMap()
     if( isAvailable != null ) declaredFields.put("isAvailable", isAvailable);
     if( flavor != null ) declaredFields.put("flavor", flavor);
     if( price != null ) declaredFields.put("price", price);
+    if( diet != null ) declaredFields.put("diet", diet);
     if( embedding != null ) declaredFields.put("embedding", embedding);
     return declaredFields;
   }
@@ -348,12 +440,13 @@ public boolean equals(@Nullable final java.lang.Object o) {
         Objects.equals(this.isAvailable, soda.isAvailable) &&
         Objects.equals(this.flavor, soda.flavor) &&
         Objects.equals(this.price, soda.price) &&
+        Objects.equals(this.diet, soda.diet) &&
         Arrays.equals(this.embedding, soda.embedding);
   }
 
   @Override
   public int hashCode() {
-    return Objects.hash(id, name, brand, isAvailable, flavor, price, Arrays.hashCode(embedding), cloudSdkCustomFields);
+    return Objects.hash(id, name, brand, isAvailable, flavor, price, diet, Arrays.hashCode(embedding), cloudSdkCustomFields);
   }
 
   @Override
@@ -366,6 +459,7 @@ public int hashCode() {
     sb.append("    isAvailable: ").append(toIndentedString(isAvailable)).append("\n");
     sb.append("    flavor: ").append(toIndentedString(flavor)).append("\n");
     sb.append("    price: ").append(toIndentedString(price)).append("\n");
+    sb.append("    diet: ").append(toIndentedString(diet)).append("\n");
     sb.append("    embedding: ").append(toIndentedString(embedding)).append("\n");
     cloudSdkCustomFields.forEach((k,v) -> sb.append("    ").append(k).append(": ").append(toIndentedString(v)).append("\n"));
     sb.append("}");