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DgsDataFetchingEnvironment.kt
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DgsDataFetchingEnvironment.kt
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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 {
@Suppress("deprecation")
val context = dfe.getContext<Any?>()
if (context is DgsContext) {
return context
} else {
throw RuntimeException("""Context object of type '${context::class.java.name}' is not a DgsContext. This method does not work if you have a custom implementation of DgsContextBuilder""")
}
}
fun <K, V> getDataLoader(loaderClass: Class<*>): DataLoader<K, V> {
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)
}
}
}