com.expediagroup.graphql.generator.federation.FederatedSchemaGenerator.kt Maven / Gradle / Ivy

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Federated GraphQL schema generator

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/*
 * Copyright 2023 Expedia, Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.expediagroup.graphql.generator.federation

import com.expediagroup.graphql.generator.SchemaGenerator
import com.expediagroup.graphql.generator.TopLevelObject
import graphql.schema.GraphQLSchema
import kotlin.reflect.KType
import kotlin.reflect.full.createType

/**
 * Generates federated GraphQL schemas based on the specified configuration.
 */
open class FederatedSchemaGenerator(
    private val generatorConfig: FederatedSchemaGeneratorConfig
) : SchemaGenerator(generatorConfig) {

    /**
     * Scans specified packages for all the federated (extended) types and adds them to the schema additional types,
     * then it generates the schema as usual using the [FederatedSchemaGeneratorConfig].
     */
    override fun generateSchema(
        queries: List,
        mutations: List,
        subscriptions: List,
        additionalTypes: Set,
        additionalInputTypes: Set,
        schemaObject: TopLevelObject?
    ): GraphQLSchema {
        val entityTypes = generatorConfig.typeResolver.locateEntities().map { it.createType() }
        return super.generateSchema(queries, mutations, subscriptions, additionalTypes + entityTypes, additionalInputTypes, schemaObject)
    }
}