Function generatePolymorphicVariantClass

java/scripts/codegen/java.ts:403–518

* Generate a single variant subclass of a polymorphic result type.

(
    className: string,
    schema: JSONSchema7,
    discriminatorValue: string,
    discriminatorProperty: string,
    baseClassName: string,
    packageName: string,
    packageDir: string
)

 * Generate a single variant subclass of a polymorphic result type.
 */
async function generatePolymorphicVariantClass(
    className: string,
    schema: JSONSchema7,
    discriminatorValue: string,
    discriminatorProperty: string,
    baseClassName: string,
    packageName: string,
    packageDir: string
): Promise<void> {
    const allImports = new Set<string>([
        "com.fasterxml.jackson.annotation.JsonIgnoreProperties",
        "com.fasterxml.jackson.annotation.JsonInclude",
        "com.fasterxml.jackson.annotation.JsonProperty",
        "javax.annotation.processing.Generated",
    ]);
    const nestedTypes = new Map<string, JavaClassDef>();

    // Collect fields (excluding the discriminator property)
    interface FieldInfo {
        jsonName: string;
        javaName: string;
        javaType: string;
        description?: string;
    }

    const fields: FieldInfo[] = [];
    if (schema.properties) {
        for (const [propName, propSchema] of Object.entries(schema.properties)) {
            if (propName === discriminatorProperty) continue;
            if (typeof propSchema !== "object") continue;
            const prop = propSchema as JSONSchema7;
            const result = schemaTypeToJava(prop, false, className, propName, nestedTypes);
            for (const imp of result.imports) allImports.add(imp);
            fields.push({
                jsonName: propName,
                javaName: toCamelCase(propName),
                javaType: result.javaType,
                description: prop.description,
            });
        }
    }

    const lines: string[] = [];
    lines.push(COPYRIGHT);
    lines.push("");
    lines.push(AUTO_GENERATED_HEADER);
    lines.push(GENERATED_FROM_API);
    lines.push("");
    lines.push(`package ${packageName};`);
    lines.push("");

    // Placeholder for imports
    const importPlaceholderIdx = lines.length;
    lines.push("__IMPORTS__");
    lines.push("");

    if (schema.description) {
        lines.push(`/**`);