chore: remove unnecessary builders for type aliases

codegen/internal/generator/additional_properties_test.go

@@ -65,9 +65,82 @@ func TestGenerateModelWithPropertiesAndAdditionalProperties(t *testing.T) {
 	assertContains(t, generated, "public Builder additionalProperty(String name, Object value)")
 }
 
+func TestGenerateModelWithoutBuilderForTypeAliases(t *testing.T) {
+	t.Parallel()
+
+	tmp := t.TempDir()
+	specPath := filepath.Join(tmp, "openapi.json")
+	outputDir := filepath.Join(tmp, "src", "main", "java")
+	resourceDir := filepath.Join(tmp, "src", "main", "resources")
+
+	spec := `{
+  "openapi": "3.0.3",
+  "info": {
+    "title": "test",
+    "version": "1.0.0"
+  },
+  "paths": {},
+  "components": {
+    "schemas": {
+      "Lon": {
+        "type": "number",
+        "format": "float"
+      },
+      "Meta": {
+        "type": "object"
+      }
+    }
+  }
+}`
+	if err := os.WriteFile(specPath, []byte(spec), 0o644); err != nil {
+		t.Fatalf("write spec: %v", err)
+	}
+
+	params := Params{
+		SpecPath:    specPath,
+		OutputDir:   outputDir,
+		ResourceDir: resourceDir,
+		BasePackage: "com.test.sdk",
+	}
+	if err := Run(context.Background(), params); err != nil {
+		t.Fatalf("run generator: %v", err)
+	}
+
+	lonPath := filepath.Join(outputDir, "com", "test", "sdk", "models", "Lon.java")
+	lonContent, err := os.ReadFile(lonPath)
+	if err != nil {
+		t.Fatalf("read generated Lon model: %v", err)
+	}
+	lonGenerated := string(lonContent)
+
+	assertContains(t, lonGenerated, "public record Lon(")
+	assertContains(t, lonGenerated, "Float value")
+	assertNotContains(t, lonGenerated, "public static Builder builder()")
+	assertNotContains(t, lonGenerated, "public static final class Builder")
+
+	metaPath := filepath.Join(outputDir, "com", "test", "sdk", "models", "Meta.java")
+	metaContent, err := os.ReadFile(metaPath)
+	if err != nil {
+		t.Fatalf("read generated Meta model: %v", err)
+	}
+	metaGenerated := string(metaContent)
+
+	assertContains(t, metaGenerated, "public record Meta(")
+	assertContains(t, metaGenerated, "java.util.Map<String, Object> value")
+	assertNotContains(t, metaGenerated, "public static Builder builder()")
+	assertNotContains(t, metaGenerated, "public static final class Builder")
+}
+
 func assertContains(t *testing.T, content, want string) {
 	t.Helper()
 	if !strings.Contains(content, want) {
 		t.Fatalf("expected generated output to contain %q", want)
 	}
 }
+
+func assertNotContains(t *testing.T, content, want string) {
+	t.Helper()
+	if strings.Contains(content, want) {
+		t.Fatalf("expected generated output to not contain %q", want)
+	}
+}

codegen/internal/generator/model.go

@@ -89,6 +89,7 @@ type schemaModel struct {
 	AdditionalProps  *additionalPropertiesModel
 	Imports          []string
 	HasRequired      bool
+	HasBuilder       bool
 	IsEnum           bool
 	EnumValues       []enumValueModel
 }
@@ -547,7 +548,8 @@ func buildSchemas(doc *v3.Document, params Params, resolver *typeResolver) []sch
 		if additionalProps != nil {
 			imports = withAdditionalPropertiesImports(imports)
 		}
-		if hasRequired {
+		hasBuilder := shouldGenerateBuilder(fields, additionalProps)
+		if hasRequired && hasBuilder {
 			imports = uniqueStrings(append(imports, "java.util.Objects"))
 		}
 		model := schemaModel{
@@ -559,12 +561,23 @@ func buildSchemas(doc *v3.Document, params Params, resolver *typeResolver) []sch
 			AdditionalProps:  additionalProps,
 			Imports:          imports,
 			HasRequired:      hasRequired,
+			HasBuilder:       hasBuilder,
 		}
 		result = append(result, model)
 	}
 	return result
 }
 
+// shouldGenerateBuilder reports whether the model should expose a builder.
+// Single-field wrapper records (for example Lon/Lat/Meta-style aliases) don't
+// benefit from a builder and should use the canonical record constructor.
+func shouldGenerateBuilder(fields []schemaField, additionalProps *additionalPropertiesModel) bool {
+	if additionalProps != nil {
+		return true
+	}
+	return !(len(fields) == 1 && fields[0].Name == "value")
+}
+
 // buildSchemaFields inspects a schema proxy and returns the fields, required
 // imports, and a flag indicating whether any required properties exist.
 func buildSchemaFields(name string, ref *base.SchemaProxy, resolver *typeResolver) ([]schemaField, *additionalPropertiesModel, []string, bool) {

codegen/internal/generator/render.go

@@ -371,6 +371,7 @@ func prepareModelTemplateData(schema schemaModel) map[string]any {
 		"Fields":           schema.Fields,
 		"AdditionalProps":  schema.AdditionalProps,
 		"HasRequired":      schema.HasRequired,
+		"HasBuilder":       schema.HasBuilder,
 		"IsEnum":           schema.IsEnum,
 		"EnumValues":       schema.EnumValues,
 	}

codegen/internal/generator/templates/model.tmpl

@@ -78,6 +78,7 @@ public record {{ .ClassName }}(
     }
 
 {{- end }}
+{{- if .HasBuilder }}
     /**
      * Creates a builder for {{ .ClassName }}.
      *
@@ -164,5 +165,6 @@ public record {{ .ClassName }}(
 {{- end }}
         }
     }
+{{- end }}
 }
 {{- end }}

codegen/internal/generator/types.go

@@ -349,7 +349,8 @@ func (r *typeResolver) inlineSchemaModels(params Params) []schemaModel {
 			if additionalProps != nil {
 				imports = withAdditionalPropertiesImports(imports)
 			}
-			if hasRequired {
+			hasBuilder := shouldGenerateBuilder(fields, additionalProps)
+			if hasRequired && hasBuilder {
 				imports = uniqueStrings(append(imports, "java.util.Objects"))
 			}
 			models = append(models, schemaModel{
@@ -361,6 +362,7 @@ func (r *typeResolver) inlineSchemaModels(params Params) []schemaModel {
 				AdditionalProps:  additionalProps,
 				Imports:          imports,
 				HasRequired:      hasRequired,
+				HasBuilder:       hasBuilder,
 			})
 			info.processed = true
 			added = true

src/main/java/com/sumup/sdk/models/Attributes.java

@@ -2,40 +2,4 @@
 package com.sumup.sdk.models;
 
 /** Object attributes that are modifiable only by SumUp applications. */
-public record Attributes(java.util.Map<String, Object> value) {
-  /**
-   * Creates a builder for Attributes.
-   *
-   * @return Builder that constructs immutable Attributes instances.
-   */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for Attributes instances. */
-  public static final class Builder {
-    private java.util.Map<String, Object> value;
-
-    private Builder() {}
-
-    /**
-     * Sets the value for {@code value}.
-     *
-     * @param value Value for the value field.
-     * @return This builder instance.
-     */
-    public Builder value(java.util.Map<String, Object> value) {
-      this.value = value;
-      return this;
-    }
-
-    /**
-     * Builds an immutable Attributes instance.
-     *
-     * @return Immutable Attributes.
-     */
-    public Attributes build() {
-      return new Attributes(value);
-    }
-  }
-}
+public record Attributes(java.util.Map<String, Object> value) {}

src/main/java/com/sumup/sdk/models/BusinessOwners.java

@@ -2,40 +2,4 @@
 package com.sumup.sdk.models;
 
 /** Business owners information. */
-public record BusinessOwners(java.util.List<com.sumup.sdk.models.BusinessOwnersItem> value) {
-  /**
-   * Creates a builder for BusinessOwners.
-   *
-   * @return Builder that constructs immutable BusinessOwners instances.
-   */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for BusinessOwners instances. */
-  public static final class Builder {
-    private java.util.List<com.sumup.sdk.models.BusinessOwnersItem> value;
-
-    private Builder() {}
-
-    /**
-     * Sets the value for {@code value}.
-     *
-     * @param value Value for the value field.
-     * @return This builder instance.
-     */
-    public Builder value(java.util.List<com.sumup.sdk.models.BusinessOwnersItem> value) {
-      this.value = value;
-      return this;
-    }
-
-    /**
-     * Builds an immutable BusinessOwners instance.
-     *
-     * @return Immutable BusinessOwners.
-     */
-    public BusinessOwners build() {
-      return new BusinessOwners(value);
-    }
-  }
-}
+public record BusinessOwners(java.util.List<com.sumup.sdk.models.BusinessOwnersItem> value) {}

src/main/java/com/sumup/sdk/models/ChangeStatus.java

@@ -7,40 +7,4 @@
  * have been applied, the status `done`. The status is only returned after write operations or on
  * read endpoints when the `version` query parameter is provided.
  */
-public record ChangeStatus(String value) {
-  /**
-   * Creates a builder for ChangeStatus.
-   *
-   * @return Builder that constructs immutable ChangeStatus instances.
-   */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for ChangeStatus instances. */
-  public static final class Builder {
-    private String value;
-
-    private Builder() {}
-
-    /**
-     * Sets the value for {@code value}.
-     *
-     * @param value Value for the value field.
-     * @return This builder instance.
-     */
-    public Builder value(String value) {
-      this.value = value;
-      return this;
-    }
-
-    /**
-     * Builds an immutable ChangeStatus instance.
-     *
-     * @return Immutable ChangeStatus.
-     */
-    public ChangeStatus build() {
-      return new ChangeStatus(value);
-    }
-  }
-}
+public record ChangeStatus(String value) {}

src/main/java/com/sumup/sdk/models/CheckoutSuccess.java

@@ -1,40 +1,4 @@
 // Code generated by sumup-java/codegen. DO NOT EDIT.
 package com.sumup.sdk.models;
 
-public record CheckoutSuccess(com.sumup.sdk.models.Checkout value) {
-  /**
-   * Creates a builder for CheckoutSuccess.
-   *
-   * @return Builder that constructs immutable CheckoutSuccess instances.
-   */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for CheckoutSuccess instances. */
-  public static final class Builder {
-    private com.sumup.sdk.models.Checkout value;
-
-    private Builder() {}
-
-    /**
-     * Sets the value for {@code value}.
-     *
-     * @param value Value for the value field.
-     * @return This builder instance.
-     */
-    public Builder value(com.sumup.sdk.models.Checkout value) {
-      this.value = value;
-      return this;
-    }
-
-    /**
-     * Builds an immutable CheckoutSuccess instance.
-     *
-     * @return Immutable CheckoutSuccess.
-     */
-    public CheckoutSuccess build() {
-      return new CheckoutSuccess(value);
-    }
-  }
-}
+public record CheckoutSuccess(com.sumup.sdk.models.Checkout value) {}

src/main/java/com/sumup/sdk/models/CompanyIdentifiers.java

@@ -2,40 +2,4 @@
 package com.sumup.sdk.models;
 
 /** A list of country-specific company identifiers. */
-public record CompanyIdentifiers(java.util.List<com.sumup.sdk.models.CompanyIdentifier> value) {
-  /**
-   * Creates a builder for CompanyIdentifiers.
-   *
-   * @return Builder that constructs immutable CompanyIdentifiers instances.
-   */
-  public static Builder builder() {
-    return new Builder();
-  }
-
-  /** Builder for CompanyIdentifiers instances. */
-  public static final class Builder {
-    private java.util.List<com.sumup.sdk.models.CompanyIdentifier> value;
-
-    private Builder() {}
-
-    /**
-     * Sets the value for {@code value}.
-     *
-     * @param value Value for the value field.
-     * @return This builder instance.
-     */
-    public Builder value(java.util.List<com.sumup.sdk.models.CompanyIdentifier> value) {
-      this.value = value;
-      return this;
-    }
-
-    /**
-     * Builds an immutable CompanyIdentifiers instance.
-     *
-     * @return Immutable CompanyIdentifiers.
-     */
-    public CompanyIdentifiers build() {
-      return new CompanyIdentifiers(value);
-    }
-  }
-}
+public record CompanyIdentifiers(java.util.List<com.sumup.sdk.models.CompanyIdentifier> value) {}