graphql.execution.instrumentation.dataloader.EmptyDataLoaderRegistryInstance Maven / Gradle / Ivy

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There is a newer version: 230521-nf-execution

package graphql.execution.instrumentation.dataloader;

import graphql.Assert;
import org.dataloader.DataLoader;
import org.dataloader.DataLoaderRegistry;

import java.util.function.Function;

public class EmptyDataLoaderRegistryInstance {
    public static final DataLoaderRegistry EMPTY_DATALOADER_REGISTRY = new DataLoaderRegistry() {
        //
        private static final String ERROR_MESSAGE = "You MUST set in your own DataLoaderRegistry to use data loader";

        @Override
        public DataLoaderRegistry register(String key, DataLoader dataLoader) {
            return Assert.assertShouldNeverHappen(ERROR_MESSAGE);
        }

        @Override
        public  DataLoader computeIfAbsent(final String key,
                                                       final Function> mappingFunction) {
            return Assert.assertShouldNeverHappen(ERROR_MESSAGE);
        }

        @Override
        public DataLoaderRegistry unregister(String key) {
            return Assert.assertShouldNeverHappen(ERROR_MESSAGE);
        }
    };
}