com.netflix.graphql.dgs.DgsDataFetchingEnvironment.kt Maven / Gradle / Ivy

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graphql-dgs

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/*
 * Copyright 2022 Netflix, 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
 *
 *    http://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.netflix.graphql.dgs

import com.netflix.graphql.dgs.context.DgsContext
import com.netflix.graphql.dgs.exceptions.MultipleDataLoadersDefinedException
import com.netflix.graphql.dgs.exceptions.NoDataLoaderFoundException
import com.netflix.graphql.dgs.internal.utils.DataLoaderNameUtil
import graphql.schema.DataFetchingEnvironment
import org.dataloader.DataLoader

class DgsDataFetchingEnvironment(private val dfe: DataFetchingEnvironment) : DataFetchingEnvironment by dfe {

    fun getDgsContext(): DgsContext {
        return DgsContext.from(this)
    }

    fun  getDataLoader(loaderClass: Class<*>): DataLoader {
        val annotation = loaderClass.getAnnotation(DgsDataLoader::class.java)
        return if (annotation != null) {
            dfe.getDataLoader(DataLoaderNameUtil.getDataLoaderName(loaderClass, annotation))
        } else {
            val loaders = loaderClass.fields.filter { it.isAnnotationPresent(DgsDataLoader::class.java) }
            if (loaders.size > 1) throw MultipleDataLoadersDefinedException(loaderClass)
            val loaderField: java.lang.reflect.Field = loaders
                .firstOrNull() ?: throw NoDataLoaderFoundException(loaderClass)
            val theAnnotation = loaderField.getAnnotation(DgsDataLoader::class.java)
            val loaderName = theAnnotation.name
            dfe.getDataLoader(loaderName)
        }
    }
}