Function generateEventVariantClass

java/scripts/codegen/java.ts:957–1085

(
    variant: EventVariant,
    packageName: string,
    packageDir: string
)

}

async function generateEventVariantClass(
    variant: EventVariant,
    packageName: string,
    packageDir: string
): Promise<void> {
    const lines: string[] = [];
    const allImports = new Set<string>([
        "com.fasterxml.jackson.annotation.JsonIgnoreProperties",
        "com.fasterxml.jackson.annotation.JsonProperty",
        "com.fasterxml.jackson.annotation.JsonInclude",
        "javax.annotation.processing.Generated",
    ]);
    const nestedTypes = new Map<string, JavaClassDef>();

    // Collect data record fields
    interface FieldInfo {
        jsonName: string;
        javaName: string;
        javaType: string;
        description?: string;
    }

    const dataFields: FieldInfo[] = [];

    if (variant.dataSchema?.properties) {
        for (const [propName, propSchema] of Object.entries(variant.dataSchema.properties)) {
            if (typeof propSchema !== "object") continue;
            const prop = propSchema as JSONSchema7;
            // Record components are always boxed (nullable by design).
            const result = schemaTypeToJava(prop, false, `${variant.className}Data`, propName, nestedTypes);
            for (const imp of result.imports) allImports.add(imp);
            dataFields.push({
                jsonName: propName,
                javaName: toCamelCase(propName),
                javaType: result.javaType,
                description: prop.description,
            });
        }
    }

    // Whether a data record should be emitted (always when dataSchema is present)
    const hasDataSchema = variant.dataSchema !== null;

    // Build the file
    lines.push(COPYRIGHT);
    lines.push("");
    lines.push(AUTO_GENERATED_HEADER);
    lines.push(GENERATED_FROM_SESSION_EVENTS);
    lines.push("");
    lines.push(`package ${packageName};`);
    lines.push("");

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

    if (variant.description) {