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/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
*--------------------------------------------------------------------------------------------*/
/**
* Java code generator for session-events and RPC types.
* Generates Java source files under sdk/src/generated/java/ from JSON Schema files.
*/
import fs from "fs/promises";
import type { JSONSchema7 } from "json-schema";
import path from "path";
import { fileURLToPath } from "url";
const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
/** Root of the copilot-sdk-java repo */
const REPO_ROOT = path.resolve(__dirname, "../..");
/** Event types to exclude from generation (internal/legacy types) */
const EXCLUDED_EVENT_TYPES = new Set(["session.import_legacy"]);
function isSchemaInternal(schema: JSONSchema7 | null | undefined): boolean {
return typeof schema === "object" &&
schema !== null &&
(schema as Record<string, unknown>).visibility === "internal";
}
const AUTO_GENERATED_HEADER = `// AUTO-GENERATED FILE - DO NOT EDIT`;
const GENERATED_FROM_SESSION_EVENTS = `// Generated from: session-events.schema.json`;
const GENERATED_FROM_API = `// Generated from: api.schema.json`;
const GENERATED_ANNOTATION = `@javax.annotation.processing.Generated("copilot-sdk-codegen")`;
const COPYRIGHT = `/*---------------------------------------------------------------------------------------------\n * Copyright (c) Microsoft Corporation. All rights reserved.\n *--------------------------------------------------------------------------------------------*/`;
// ── Naming utilities ─────────────────────────────────────────────────────────
/**
* Correct the GitHub brand casing in a generated identifier or documentation
* string. Schema titles/definition names and value-derived identifiers may
* render the brand as "Github"; the correct casing is "GitHub". Lowercase
* wire/protocol values (e.g. "github") are left untouched. Idempotent.
*/
function fixBrandCasing(value: string): string {
return value.replace(/Github/g, "GitHub");
}
const BRAND_NORMALIZED_STRING_KEYS = new Set(["title", "description", "markdownDescription"]);
/**
* Recursively normalize GitHub brand casing within a parsed JSON schema:
* definition-map keys, `$ref` pointers (definition-name segment only), and
* documentation strings. Wire-level values (`const`, `enum`, `default`, ...) are
* left untouched. Mutates in place and returns the schema.
*/
function normalizeSchemaBrandCasing<T>(schema: T): T {
normalizeBrandCasingNode(schema);
return schema;
}
function normalizeBrandCasingNode(node: unknown): void {
if (Array.isArray(node)) {
for (const item of node) normalizeBrandCasingNode(item);
return;
}
if (node === null || typeof node !== "object") return;
const obj = node as Record<string, unknown>;
if (obj.title === "ProviderModelConfig" && obj.properties && typeof obj.properties === "object") {
const tokenFields = new Set([
"maxPromptTokens",
"maxContextWindowTokens",
"maxOutputTokens",
]);
for (const [key, value] of Object.entries(obj.properties as Record<string, unknown>)) {
if (
tokenFields.has(key) &&
value !== null &&
typeof value === "object" &&
(value as Record<string, unknown>).type === "number"
) {
(value as Record<string, unknown>).type = "integer";
}
}
}
for (const defsKey of ["definitions", "$defs"] as const) {
const defs = obj[defsKey];
if (defs && typeof defs === "object" && !Array.isArray(defs)) {
renameBrandDefinitionKeys(defs as Record<string, unknown>);
}
}
for (const [key, value] of Object.entries(obj)) {
if (typeof value === "string") {
if (key === "$ref") {
obj[key] = fixBrandRef(value);
} else if (BRAND_NORMALIZED_STRING_KEYS.has(key)) {
obj[key] = fixBrandCasing(value);
}
} else {
normalizeBrandCasingNode(value);
}
}
}
function fixBrandRef(ref: string): string {
const lastSlash = ref.lastIndexOf("/");
if (lastSlash === -1) return ref;
return `${ref.slice(0, lastSlash + 1)}${fixBrandCasing(ref.slice(lastSlash + 1))}`;
}
function stableStringify(value: unknown): string {
if (Array.isArray(value)) {
return `[${value.map((item) => stableStringify(item)).join(",")}]`;
}
if (value && typeof value === "object") {
const entries = Object.entries(value as Record<string, unknown>).sort(([a], [b]) => a.localeCompare(b));
return `{${entries.map(([key, entryValue]) => `${JSON.stringify(key)}:${stableStringify(entryValue)}`).join(",")}}`;
}
return JSON.stringify(value) ?? "undefined";
}
function renameBrandDefinitionKeys(defs: Record<string, unknown>): void {
for (const oldKey of Object.keys(defs)) {
const newKey = fixBrandCasing(oldKey);
if (newKey === oldKey) continue;
if (newKey in defs && stableStringify(defs[newKey]) !== stableStringify(defs[oldKey])) {
throw new Error(
`Brand-casing normalization collision: "${oldKey}" -> "${newKey}" but a different definition already exists under "${newKey}".`
);
}
defs[newKey] = defs[oldKey];
delete defs[oldKey];
}
}
function toPascalCase(name: string): string {
return fixBrandCasing(name.split(/[-_.]/).map((p) => p.charAt(0).toUpperCase() + p.slice(1)).join(""));
}
function toJavaClassName(typeName: string): string {
return fixBrandCasing(typeName.split(/[._]/).map((p) => p.charAt(0).toUpperCase() + p.slice(1)).join(""));
}
/** Java reserved keywords and Object method names that cannot be used as record component names. */
const JAVA_RESERVED_IDENTIFIERS = new Set([
"abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const",
"continue", "default", "do", "double", "else", "enum", "extends", "final", "finally", "float",
"for", "goto", "if", "implements", "import", "instanceof", "int", "interface", "long", "native",
"new", "package", "private", "protected", "public", "return", "short", "static", "strictfp",
"super", "switch", "synchronized", "this", "throw", "throws", "transient", "try", "void",
"volatile", "while",
// Object methods that conflict with record component accessor names
"wait", "notify", "notifyAll", "getClass", "clone", "finalize", "toString", "hashCode", "equals",
]);
function toCamelCase(name: string): string {
const pascal = toPascalCase(name);
let result = pascal.charAt(0).toLowerCase() + pascal.slice(1);
if (JAVA_RESERVED_IDENTIFIERS.has(result)) {
result = result + "_";
}
return result;
}
function toEnumConstant(value: string): string {
const constant = value.toUpperCase().replace(/[^A-Z0-9]/g, "_").replace(/^_+/, "").replace(/_+/g, "_");
if (constant.length === 0) return "_";
return /^[0-9]/.test(constant) ? `_${constant}` : constant;
}
// ── Schema path resolution ───────────────────────────────────────────────────
/** Resolve a JSON schema staged from the pinned GitHub Release artifact. */
async function resolveCopilotSchemaPath(fileName: string): Promise<string> {
const schemaPath = path.join(REPO_ROOT, "scripts/codegen/target/schemas", fileName);
try {
await fs.access(schemaPath);
return schemaPath;
} catch {
throw new Error(`${fileName} not found. Run 'npm run fetch:schemas' in java/scripts/codegen.`);
}
}
async function getSessionEventsSchemaPath(): Promise<string> {
return resolveCopilotSchemaPath("session-events.schema.json");
}
async function getApiSchemaPath(): Promise<string> {
return resolveCopilotSchemaPath("api.schema.json");
}
// ── File writing ─────────────────────────────────────────────────────────────
async function writeGeneratedFile(relativePath: string, content: string): Promise<string> {
const fullPath = path.join(REPO_ROOT, relativePath);
await fs.mkdir(path.dirname(fullPath), { recursive: true });
await fs.writeFile(fullPath, content, "utf-8");
console.log(` ✓ ${relativePath}`);
return fullPath;
}
// ── Java type mapping ─────────────────────────────────────────────────────────
interface JavaTypeResult {
javaType: string;
imports: Set<string>;
}
// Module-level state for $ref resolution during codegen.
// Set before each schema generation pass; used by schemaTypeToJava and helpers.
let currentDefinitions: Record<string, JSONSchema7> = {};
const pendingStandaloneTypes = new Map<string, JSONSchema7>();
const promotedNestedUnionTypes = new Set<string>();
const generatedSessionEventTypeNames = new Set<string>();
// Cross-schema definitions: keyed by schema filename (e.g. "session-events.schema.json"),
// value is the definitions map from that schema. Populated by generateRpcTypes so that
// cross-schema $ref values like "session-events.schema.json#/definitions/Foo" can be resolved.
const crossSchemaDefinitions = new Map<string, Record<string, JSONSchema7>>();
/**
* Resolve a $ref in a JSON Schema against the current definitions.
* Returns the resolved schema, or the original if no $ref is present.
*/
function resolveRef(schema: JSONSchema7 | undefined): JSONSchema7 | undefined {
if (!schema) return schema;
if (schema.$ref) {
const name = schema.$ref.replace(/^#\/definitions\//, "");
const resolved = currentDefinitions[name];
if (!resolved) {
console.warn(`[codegen] Unresolved $ref: ${schema.$ref}`);
return schema;
}
return resolved;
}
return schema;
}
function hasOmissionSentinel(schema: JSONSchema7): boolean {
return (schema.anyOf ?? []).some(
(variant) =>
typeof variant === "object"
&& variant !== null
&& typeof (variant as JSONSchema7).not === "object"
&& (variant as JSONSchema7).not !== null
&& Object.keys((variant as JSONSchema7).not as object).length === 0
);
}
/**
* Resolve a method's params schema to the object schema that carries its properties.
*
* Methods whose params object is entirely optional are published as
* `anyOf: [{ not: {} }, { ...object }]`, so the properties live on a variant
* rather than on the schema itself.
*/
function resolveMethodParamsSchema(method: RpcMethodNode): JSONSchema7 | undefined {
const params = resolveRef(method.params ?? undefined);
if (!params || typeof params !== "object") return undefined;
if (params.properties) return params;
if (!Array.isArray(params.anyOf)) return undefined;
const objectVariants = resolveAnyOfVariants(params.anyOf as JSONSchema7[]).filter((variant) => !!variant.properties);
return hasOmissionSentinel(params) && objectVariants.length === 1 ? objectVariants[0] : undefined;
}
function resolveMethodParamsUnionSchema(method: RpcMethodNode): JSONSchema7 | undefined {
const params = resolveRef(method.params ?? undefined);
if (!params || typeof params !== "object" || !Array.isArray(params.anyOf)) return undefined;
const variants = resolveAnyOfVariants(params.anyOf as JSONSchema7[]);
return variants.length > 1 && findDiscriminator(variants) ? params : undefined;
}
/** Extract the definition name from a $ref string (e.g., "#/definitions/Foo" → "Foo") */
function extractRefName(schema: JSONSchema7 | null | undefined): string | null {
if (!schema?.$ref) return null;
// Handle cross-schema refs
const crossMatch = schema.$ref.match(/^[^#]+#\/definitions\/(.+)$/);
if (crossMatch) return crossMatch[1];
return schema.$ref.replace(/^#\/definitions\//, "");
}
// ── Discriminated union support ─────────────────────────────────────────────
interface DiscriminatorInfo {
property: string;
mapping: Map<string, { value: unknown; schema: JSONSchema7 }>;
}
/**
* Find a discriminator property shared by all variants in an anyOf.
* A discriminator is a property with a `const` value that uniquely identifies each variant.
*/
function findDiscriminator(variants: JSONSchema7[]): DiscriminatorInfo | null {
if (variants.length === 0) return null;
const firstVariant = variants[0];
if (!firstVariant.properties) return null;
for (const [propName, propSchema] of Object.entries(firstVariant.properties).sort(([a], [b]) => a.localeCompare(b))) {
if (typeof propSchema !== "object") continue;
const schema = propSchema as JSONSchema7;
if (schema.const === undefined) continue;
const mapping = new Map<string, { value: unknown; schema: JSONSchema7 }>();
let isValidDiscriminator = true;
for (const variant of variants) {
if (!variant.properties) { isValidDiscriminator = false; break; }
const variantProp = variant.properties[propName];
if (typeof variantProp !== "object") { isValidDiscriminator = false; break; }
const variantSchema = variantProp as JSONSchema7;
if (variantSchema.const === undefined) { isValidDiscriminator = false; break; }
const key = String(variantSchema.const);
if (mapping.has(key)) { isValidDiscriminator = false; break; }
mapping.set(key, { value: variantSchema.const, schema: variant });
}
if (isValidDiscriminator && mapping.size === variants.length) {
return { property: propName, mapping };
}
}
return null;
}
/**
* Resolve anyOf variants, handling $ref to definitions.
*/
function resolveAnyOfVariants(
anyOf: JSONSchema7[],
definitions: Record<string, JSONSchema7> = currentDefinitions
): JSONSchema7[] {
return anyOf
.map((v) => {
if (v.$ref) {
const name = v.$ref.replace(/^#\/definitions\//, "");
return definitions[name] ?? v;
}
return v;
})
.filter((v) => v.type !== "null");
}
export function collectNestedDiscriminatedUnionTypeNames(
root: unknown,
definitions: Record<string, JSONSchema7>
): Set<string> {
const promotedTypes = new Set<string>();
const definitionName = (schema: JSONSchema7): string | null => {
return schema.$ref?.match(/^#\/definitions\/([^/]+)$/)?.[1] ?? null;
};
const resolveLocal = (schema: JSONSchema7): JSONSchema7 | null => {
const name = definitionName(schema);
return name ? definitions[name] ?? null : schema;
};
const closedDiscriminatedUnionVariants = (schema: JSONSchema7): JSONSchema7[] | null => {
const resolved = resolveLocal(schema);
if (!resolved?.anyOf || !Array.isArray(resolved.anyOf)) return null;
const variants = resolveAnyOfVariants(resolved.anyOf as JSONSchema7[], definitions);
return variants.length > 1
&& findDiscriminator(variants)
&& variants.every((variant) => variant.additionalProperties === false)
? variants
: null;
};
const rootSchema = typeof root === "object" && root !== null ? root as JSONSchema7 : null;
const rootVariants = rootSchema ? closedDiscriminatedUnionVariants(rootSchema) : null;
if (!rootVariants) return promotedTypes;
const nestedUnionItems: JSONSchema7[] = [];
for (const variant of rootVariants) {
for (const property of Object.values(variant.properties ?? {})) {
if (!property || typeof property !== "object") continue;
const propertySchema = resolveLocal(property as JSONSchema7);
if (
propertySchema?.type === "array"
&& propertySchema.items
&& !Array.isArray(propertySchema.items)
&& closedDiscriminatedUnionVariants(propertySchema.items as JSONSchema7)
) {
nestedUnionItems.push(propertySchema.items as JSONSchema7);
}
}
}
const visitedDefinitions = new Set<string>();
const visit = (schema: JSONSchema7): void => {
const name = definitionName(schema);
if (name) {
if (visitedDefinitions.has(name)) return;
visitedDefinitions.add(name);
const resolved = definitions[name];
if (!resolved) return;
if (closedDiscriminatedUnionVariants(schema)) {
promotedTypes.add(name);
}
visit(resolved);
return;
}
for (const property of Object.values(schema.properties ?? {})) {
if (property && typeof property === "object") {
visit(property as JSONSchema7);
}
}
if (schema.items && !Array.isArray(schema.items)) {
visit(schema.items as JSONSchema7);
}
if (schema.additionalProperties && typeof schema.additionalProperties === "object") {
visit(schema.additionalProperties as JSONSchema7);
}
for (const branch of [...(schema.anyOf ?? []), ...(schema.allOf ?? [])]) {
if (branch && typeof branch === "object") {
visit(branch as JSONSchema7);
}
}
};
for (const items of nestedUnionItems) visit(items);
return promotedTypes;
}
/**
* Generate a polymorphic base class and variant subclasses for a discriminated union result type.
*/
async function generatePolymorphicResultClass(
className: string,
schema: JSONSchema7,
packageName: string,
packageDir: string
): Promise<void> {
const anyOf = schema.anyOf as JSONSchema7[];
const variants = resolveAnyOfVariants(anyOf);
const discriminator = findDiscriminator(variants);
if (!discriminator) {
console.warn(`[codegen] Cannot find discriminator for ${className} — skipping polymorphic generation`);
return;
}
// Collect variant info
interface VariantInfo {
discriminatorValue: string;
variantClassName: string;
schema: JSONSchema7;
}
const variantInfos: VariantInfo[] = [];
for (const [discValue, { schema: variantSchema }] of discriminator.mapping) {
const variantClassName = (variantSchema as JSONSchema7 & { title?: string }).title ?? `${className}${toPascalCase(discValue)}`;
variantInfos.push({ discriminatorValue: discValue, variantClassName, schema: variantSchema });
}
// Generate the abstract base class
const baseLines: string[] = [];
baseLines.push(COPYRIGHT);
baseLines.push("");
baseLines.push(AUTO_GENERATED_HEADER);
baseLines.push(GENERATED_FROM_API);
baseLines.push("");
baseLines.push(`package ${packageName};`);
baseLines.push("");
baseLines.push(`import com.fasterxml.jackson.annotation.JsonIgnoreProperties;`);
baseLines.push(`import com.fasterxml.jackson.annotation.JsonSubTypes;`);
baseLines.push(`import com.fasterxml.jackson.annotation.JsonTypeInfo;`);
baseLines.push(`import javax.annotation.processing.Generated;`);
baseLines.push("");
if (schema.description) {
baseLines.push(`/**`);
baseLines.push(` * ${schema.description}`);
baseLines.push(` *`);
baseLines.push(` * @since 1.0.0`);
baseLines.push(` */`);
}
const typeInfoInclude = promotedNestedUnionTypes.has(className)
? `, include = JsonTypeInfo.As.EXISTING_PROPERTY`
: "";
baseLines.push(`@JsonTypeInfo(use = JsonTypeInfo.Id.NAME${typeInfoInclude}, property = "${discriminator.property}", visible = true)`);
baseLines.push(`@JsonSubTypes({`);
for (let i = 0; i < variantInfos.length; i++) {
const v = variantInfos[i];
const comma = i < variantInfos.length - 1 ? "," : "";
baseLines.push(` @JsonSubTypes.Type(value = ${v.variantClassName}.class, name = "${v.discriminatorValue}")${comma}`);
}
baseLines.push(`})`);
baseLines.push(`@JsonIgnoreProperties(ignoreUnknown = true)`);
baseLines.push(GENERATED_ANNOTATION);
baseLines.push(`public abstract class ${className} {`);
baseLines.push("");
baseLines.push(` /**`);
baseLines.push(` * Returns the discriminator value for this variant.`);
baseLines.push(` *`);
baseLines.push(` * @return the ${discriminator.property} discriminator`);
baseLines.push(` */`);
baseLines.push(` public abstract String get${toPascalCase(discriminator.property)}();`);
baseLines.push(`}`);
baseLines.push("");
await writeGeneratedFile(`${packageDir}/${className}.java`, baseLines.join("\n"));
// Generate each variant subclass
for (const variant of variantInfos) {
await generatePolymorphicVariantClass(variant.variantClassName, variant.schema, variant.discriminatorValue, discriminator.property, className, packageName, packageDir);
}
}
/**
* 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(`/**`);
lines.push(` * ${schema.description}`);
lines.push(` *`);
lines.push(` * @since 1.0.0`);
lines.push(` */`);
} else {
lines.push(`/**`);
lines.push(` * Variant {@code ${discriminatorValue}} of {@link ${baseClassName}}.`);
lines.push(` *`);
lines.push(` * @since 1.0.0`);
lines.push(` */`);
}
lines.push(`@JsonIgnoreProperties(ignoreUnknown = true)`);
lines.push(`@JsonInclude(JsonInclude.Include.NON_NULL)`);
lines.push(GENERATED_ANNOTATION);
lines.push(`public final class ${className} extends ${baseClassName} {`);
lines.push("");
// Discriminator field
lines.push(` @JsonProperty("${discriminatorProperty}")`);
lines.push(` private final String ${toCamelCase(discriminatorProperty)} = "${discriminatorValue}";`);
lines.push("");
lines.push(` @Override`);
lines.push(` public String get${toPascalCase(discriminatorProperty)}() { return ${toCamelCase(discriminatorProperty)}; }`);
lines.push("");
// Other fields
for (const field of fields) {
if (field.description) {
lines.push(` /** ${field.description} */`);
}
lines.push(` @JsonProperty("${field.jsonName}")`);
lines.push(` private ${field.javaType} ${field.javaName};`);
lines.push("");
}
// Getters and setters
for (const field of fields) {
lines.push(` public ${field.javaType} get${field.javaName.charAt(0).toUpperCase() + field.javaName.slice(1)}() { return ${field.javaName}; }`);
lines.push(` public void set${field.javaName.charAt(0).toUpperCase() + field.javaName.slice(1)}(${field.javaType} ${field.javaName}) { this.${field.javaName} = ${field.javaName}; }`);
lines.push("");
}
// Render nested types
for (const [, nested] of nestedTypes) {
lines.push(...renderNestedType(nested, 1, new Map(), allImports));
}
if (lines[lines.length - 1] === "") lines.pop();
lines.push(`}`);
lines.push("");
// Replace import placeholder
const sortedImports = [...allImports].sort();
const importLines = sortedImports.map((i) => `import ${i};`).join("\n");
lines[importPlaceholderIdx] = importLines;
await writeGeneratedFile(`${packageDir}/${className}.java`, lines.join("\n"));
}
interface JavaTypeResolution {
definitions: Record<string, JSONSchema7>;
standaloneTypes: Map<string, JSONSchema7>;
promotedUnionTypes: Set<string>;
}
export function schemaTypeToJava(
schema: JSONSchema7,
required: boolean,
context: string,
propName: string,
nestedTypes: Map<string, JavaClassDef>,
resolution: JavaTypeResolution = {
definitions: currentDefinitions,
standaloneTypes: pendingStandaloneTypes,
promotedUnionTypes: promotedNestedUnionTypes,
}
): JavaTypeResult {
const imports = new Set<string>();
// Resolve $ref first — register standalone types for generation
if (schema.$ref) {
// Handle cross-schema $ref (e.g. "session-events.schema.json#/definitions/Foo")
const crossSchemaMatch = schema.$ref.match(/^([^#]+)#\/definitions\/(.+)$/);
if (crossSchemaMatch) {
const [, schemaFile, typeName] = crossSchemaMatch;
const externalDefs = crossSchemaDefinitions.get(schemaFile);
if (
schemaFile === "session-events.schema.json"
&& externalDefs?.[typeName]
&& generatedSessionEventTypeNames.has(typeName)
) {
imports.add(`com.github.copilot.generated.${typeName}`);
return { javaType: typeName, imports };
}
return { javaType: "Object", imports };
}
const name = schema.$ref.replace(/^#\/definitions\//, "");
const resolved = resolution.definitions[name];
if (resolved) {
if (
resolution.promotedUnionTypes.has(name)
&& resolved.anyOf
&& Array.isArray(resolved.anyOf)
) {
const variants = resolveAnyOfVariants(resolved.anyOf as JSONSchema7[], resolution.definitions);
if (variants.length > 1 && findDiscriminator(variants)) {
resolution.standaloneTypes.set(name, resolved);
return { javaType: name, imports };
}
}
// Enum or object types → register for standalone generation, return ref name
if ((resolved.type === "string" && resolved.enum) ||
(resolved.type === "object" && resolved.properties)) {
resolution.standaloneTypes.set(name, resolved);
return { javaType: name, imports };
}
// Other types (primitives, arrays, maps, anyOf unions) → resolve and recurse
return schemaTypeToJava(resolved, required, context, propName, nestedTypes, resolution);
}
// Unresolved $ref — return name as-is
console.warn(`[codegen] Unresolved $ref: ${schema.$ref}`);
return { javaType: name, imports };
}
if (schema.anyOf) {
const hasNull = schema.anyOf.some((s) => typeof s === "object" && (s as JSONSchema7).type === "null");
const nonNull = schema.anyOf.filter((s) => typeof s === "object" && (s as JSONSchema7).type !== "null");
if (nonNull.length === 1) {
const result = schemaTypeToJava(nonNull[0] as JSONSchema7, required && !hasNull,
context, propName, nestedTypes, resolution);
return result;
}
// Multi-branch anyOf: fall through to Object, matching the C# generator's
// behavior. Java has no union types, so Object is the correct erasure for
// anyOf[string, object] and similar multi-variant schemas.
console.warn(`[codegen] ${context}.${propName}: anyOf with ${nonNull.length} non-null branches — falling back to Object`);
return { javaType: "Object", imports };
}
if (schema.type === "string") {
if (schema.format === "uuid") {
imports.add("java.util.UUID");
return { javaType: "UUID", imports };
}
if (schema.format === "date-time") {
imports.add("java.time.OffsetDateTime");
return { javaType: "OffsetDateTime", imports };
}
if (schema.enum && Array.isArray(schema.enum)) {
const enumName = `${context}${toPascalCase(propName)}`;
nestedTypes.set(enumName, {
kind: "enum",
name: enumName,
values: schema.enum as string[],
description: schema.description,
});
return { javaType: enumName, imports };
}
return { javaType: "String", imports };
}
if (Array.isArray(schema.type)) {
const nonNullTypes = schema.type.filter((t) => t !== "null");
if (nonNullTypes.length === 1) {
const baseSchema = { ...schema, type: nonNullTypes[0] };
return schemaTypeToJava(baseSchema as JSONSchema7, required, context, propName,
nestedTypes, resolution);
}
}
if (schema.type === "integer") {
// JSON Schema "integer" maps to Long (boxed — always used for records).
// Use primitive long for required fields in mutable-bean contexts if needed.
return { javaType: required ? "long" : "Long", imports };
}
if (schema.type === "number") {
return { javaType: required ? "double" : "Double", imports };
}
if (schema.type === "boolean") {
return { javaType: required ? "boolean" : "Boolean", imports };
}
if (schema.type === "array") {
const items = schema.items as JSONSchema7 | undefined;
if (items) {
// Always pass required=false so primitives are boxed (List<Long>, not List<long>)
const itemResult = schemaTypeToJava(items, false, context, propName + "Item",
nestedTypes, resolution);
imports.add("java.util.List");
for (const imp of itemResult.imports) imports.add(imp);
return { javaType: `List<${itemResult.javaType}>`, imports };
}
imports.add("java.util.List");
console.warn(`[codegen] ${context}.${propName}: array without typed items — falling back to List<Object>`);
return { javaType: "List<Object>", imports };
}
if (schema.type === "object") {
if (schema.properties && Object.keys(schema.properties).length > 0) {
const nestedName = `${context}${toPascalCase(propName)}`;
if (!nestedTypes.has(nestedName)) {
nestedTypes.set(nestedName, {
kind: "class",
name: nestedName,
schema,
description: schema.description,
});
}
return { javaType: nestedName, imports };
}
if (schema.additionalProperties) {
const valueSchema = typeof schema.additionalProperties === "object"
? schema.additionalProperties as JSONSchema7
: { type: "object" } as JSONSchema7;
// Always pass required=false so primitives are boxed (Map<String, Long>, not Map<String, long>)
const valueResult = schemaTypeToJava(valueSchema, false, context,
propName + "Value", nestedTypes, resolution);
imports.add("java.util.Map");
for (const imp of valueResult.imports) imports.add(imp);
return { javaType: `Map<String, ${valueResult.javaType}>`, imports };
}
imports.add("java.util.Map");
console.warn(`[codegen] ${context}.${propName}: object without typed properties or additionalProperties — falling back to Map<String, Object>`);
return { javaType: "Map<String, Object>", imports };
}
console.warn(`[codegen] ${context}.${propName}: unrecognized schema (type=${JSON.stringify(schema.type)}) — falling back to Object`);
return { javaType: "Object", imports };
}
// ── Class definitions ─────────────────────────────────────────────────────────
interface JavaClassDef {
kind: "class" | "enum";
name: string;
description?: string;
schema?: JSONSchema7;
values?: string[]; // for enum
}
// ── Session Events codegen ────────────────────────────────────────────────────
interface EventVariant {
typeName: string;
className: string;
dataSchema: JSONSchema7 | null;
description?: string;
stability?: string;
deprecated?: boolean;
}
function extractEventVariants(schema: JSONSchema7): EventVariant[] {
const definitions = schema.definitions as Record<string, JSONSchema7>;
const sessionEvent = definitions?.SessionEvent;
if (!sessionEvent?.anyOf) throw new Error("Schema must have SessionEvent definition with anyOf");
return (sessionEvent.anyOf as JSONSchema7[])
.map((variant) => {
// Resolve $ref if present (1.0.35+ schema uses $ref to named definitions)
let resolved = variant;
if (variant.$ref) {
const refName = variant.$ref.replace(/^#\/definitions\//, "");
resolved = definitions[refName];
if (!resolved) throw new Error(`Unresolved $ref: ${variant.$ref}`);
}
const typeSchema = resolved.properties?.type as JSONSchema7;
const typeName = typeSchema?.const as string;
if (!typeName) throw new Error("Variant must have type.const");
const baseName = toJavaClassName(typeName);
let dataSchema = resolved.properties?.data as JSONSchema7 | undefined;
// Resolve $ref on data schema if present
if (dataSchema?.$ref) {
const dataRefName = dataSchema.$ref.replace(/^#\/definitions\//, "");
dataSchema = definitions[dataRefName];
}
return {
typeName,
className: `${baseName}Event`,
dataSchema: dataSchema ?? null,
description: resolved.description,
stability: (variant as unknown as Record<string, unknown>).stability as string | undefined,
deprecated: (variant as unknown as Record<string, unknown>).deprecated === true,
};
})
.filter((v) => !EXCLUDED_EVENT_TYPES.has(v.typeName) && !isSchemaInternal(v.dataSchema));
}
async function generateSessionEvents(schemaPath: string): Promise<void> {
console.log("\n📋 Generating session event classes...");
const schemaContent = await fs.readFile(schemaPath, "utf-8");
const schema = normalizeSchemaBrandCasing(JSON.parse(schemaContent) as JSONSchema7);
// Set module-level definitions for $ref resolution
currentDefinitions = (schema.definitions ?? {}) as Record<string, JSONSchema7>;
pendingStandaloneTypes.clear();
const variants = extractEventVariants(schema);
const packageName = "com.github.copilot.generated";
const packageDir = `sdk/src/generated/java/com/github/copilot/generated`;
// Generate base SessionEvent class
await generateSessionEventBaseClass(variants, packageName, packageDir);
// Generate one class file per event variant
for (const variant of variants) {
await generateEventVariantClass(variant, packageName, packageDir);
}
// Generate standalone types discovered via $ref resolution
await generatePendingStandaloneTypes(packageName, packageDir, GENERATED_FROM_SESSION_EVENTS);
generatedSessionEventTypeNames.clear();
for (const entry of await fs.readdir(path.join(REPO_ROOT, packageDir), { withFileTypes: true })) {
if (entry.isFile() && entry.name.endsWith(".java")) {
generatedSessionEventTypeNames.add(path.basename(entry.name, ".java"));
}
}
console.log(`✅ Generated ${variants.length + 1} session event files`);
}
async function generateSessionEventBaseClass(
variants: EventVariant[],
packageName: string,
packageDir: string
): Promise<void> {
const lines: string[] = [];
lines.push(COPYRIGHT);
lines.push("");
lines.push(AUTO_GENERATED_HEADER);
lines.push(GENERATED_FROM_SESSION_EVENTS);
lines.push("");
lines.push(`package ${packageName};`);
lines.push("");
lines.push(`import com.fasterxml.jackson.annotation.JsonIgnoreProperties;`);
lines.push(`import com.fasterxml.jackson.annotation.JsonInclude;`);
lines.push(`import com.fasterxml.jackson.annotation.JsonProperty;`);
lines.push(`import com.fasterxml.jackson.annotation.JsonSubTypes;`);
lines.push(`import com.fasterxml.jackson.annotation.JsonTypeInfo;`);
lines.push(`import java.time.OffsetDateTime;`);
lines.push(`import java.util.UUID;`);
lines.push(`import javax.annotation.processing.Generated;`);
lines.push("");
lines.push(`/**`);
lines.push(` * Base class for all generated session events.`);
lines.push(` *`);
lines.push(` * @since 1.0.0`);
lines.push(` */`);
lines.push(`@JsonIgnoreProperties(ignoreUnknown = true)`);
lines.push(`@JsonInclude(JsonInclude.Include.NON_NULL)`);
lines.push(`@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type", visible = true, defaultImpl = UnknownSessionEvent.class)`);
lines.push(`@JsonSubTypes({`);
for (let i = 0; i < variants.length; i++) {
const v = variants[i];
const comma = i < variants.length - 1 ? "," : "";
lines.push(` @JsonSubTypes.Type(value = ${v.className}.class, name = "${v.typeName}")${comma}`);
}
lines.push(`})`);
lines.push(GENERATED_ANNOTATION);
// Build the permits clause (all variant classes + UnknownSessionEvent last)
const allPermitted = [...variants.map((v) => v.className), "UnknownSessionEvent"];
lines.push(`public abstract sealed class SessionEvent permits`);
for (let i = 0; i < allPermitted.length; i++) {
const comma = i < allPermitted.length - 1 ? "," : " {";
lines.push(` ${allPermitted[i]}${comma}`);
}
lines.push("");
lines.push(` /** Unique event identifier (UUID v4), generated when the event is emitted. */`);
lines.push(` @JsonProperty("id")`);
lines.push(` private UUID id;`);
lines.push("");
lines.push(` /** ISO 8601 timestamp when the event was created. */`);
lines.push(` @JsonProperty("timestamp")`);
lines.push(` private OffsetDateTime timestamp;`);
lines.push("");
lines.push(` /** ID of the chronologically preceding event in the session. Null for the first event. */`);
lines.push(` @JsonProperty("parentId")`);
lines.push(` private UUID parentId;`);
lines.push("");
lines.push(` /** Sub-agent instance identifier. Absent for events from the root/main agent and session-level events. */`);
lines.push(` @JsonProperty("agentId")`);
lines.push(` private String agentId;`);
lines.push("");
lines.push(` /** When true, the event is transient and not persisted to the session event log on disk. */`);
lines.push(` @JsonProperty("ephemeral")`);
lines.push(` private Boolean ephemeral;`);
lines.push("");
lines.push(` /**`);
lines.push(` * Returns the event-type discriminator string (e.g., {@code "session.idle"}).`);
lines.push(` *`);
lines.push(` * @return the event type`);
lines.push(` */`);
lines.push(` public abstract String getType();`);
lines.push("");
lines.push(` public UUID getId() { return id; }`);
lines.push(` public void setId(UUID id) { this.id = id; }`);
lines.push("");
lines.push(` public OffsetDateTime getTimestamp() { return timestamp; }`);
lines.push(` public void setTimestamp(OffsetDateTime timestamp) { this.timestamp = timestamp; }`);
lines.push("");
lines.push(` public UUID getParentId() { return parentId; }`);
lines.push(` public void setParentId(UUID parentId) { this.parentId = parentId; }`);
lines.push("");
lines.push(` public String getAgentId() { return agentId; }`);
lines.push(` public void setAgentId(String agentId) { this.agentId = agentId; }`);
lines.push("");
lines.push(` public Boolean getEphemeral() { return ephemeral; }`);
lines.push(` public void setEphemeral(Boolean ephemeral) { this.ephemeral = ephemeral; }`);
lines.push(`}`);
lines.push("");
await writeGeneratedFile(`${packageDir}/SessionEvent.java`, lines.join("\n"));
// Also generate the UnknownSessionEvent fallback
await generateUnknownEventClass(packageName, packageDir);
}
async function generateUnknownEventClass(packageName: string, packageDir: string): Promise<void> {
const lines: string[] = [];
lines.push(COPYRIGHT);
lines.push("");
lines.push(AUTO_GENERATED_HEADER);
lines.push(GENERATED_FROM_SESSION_EVENTS);
lines.push("");
lines.push(`package ${packageName};`);
lines.push("");
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