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AWS AppSync GraphQL runtime library to support generated code
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/**
 * Copyright 2018-2019 Amazon.com,
 * Inc. or its affiliates. All Rights Reserved.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

package com.apollographql.apollo.internal.cache.normalized;

import com.apollographql.apollo.api.GraphqlFragment;
import com.apollographql.apollo.api.Operation;
import com.apollographql.apollo.api.Response;
import com.apollographql.apollo.api.ResponseFieldMapper;
import com.apollographql.apollo.cache.CacheHeaders;
import com.apollographql.apollo.cache.normalized.ApolloStore;
import com.apollographql.apollo.cache.normalized.GraphQLStoreOperation;
import com.apollographql.apollo.cache.normalized.CacheKey;
import com.apollographql.apollo.cache.normalized.CacheKeyResolver;
import com.apollographql.apollo.cache.normalized.NormalizedCache;
import com.apollographql.apollo.cache.normalized.Record;

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

/**
 * An alternative to {@link RealAppSyncStore} for when a no-operation cache is needed.
 */
public final class NoOpApolloStore implements ApolloStore, ReadableStore, WriteableStore {

  @Override public Set merge(@Nonnull Collection recordCollection, @Nonnull CacheHeaders cacheHeaders) {
    return Collections.emptySet();
  }

  @Override public Set merge(Record record, @Nonnull CacheHeaders cacheHeaders) {
    return Collections.emptySet();
  }

  @Nullable @Override public Record read(@Nonnull String key, @Nonnull CacheHeaders cacheHeaders) {
    return null;
  }

  @Override public Collection read(@Nonnull Collection keys, @Nonnull CacheHeaders cacheHeaders) {
    return Collections.emptySet();
  }

  @Override public void subscribe(RecordChangeSubscriber subscriber) {
  }

  @Override public void unsubscribe(RecordChangeSubscriber subscriber) {
  }

  @Override public void publish(Set keys) {
  }

  @Nonnull @Override public GraphQLStoreOperation clearAll() {
    return GraphQLStoreOperation.emptyOperation(Boolean.FALSE);
  }

  @Nonnull @Override public GraphQLStoreOperation remove(@Nonnull CacheKey cacheKey) {
    return GraphQLStoreOperation.emptyOperation(Boolean.FALSE);
  }

  @Nonnull @Override public GraphQLStoreOperation remove(@Nonnull List cacheKeys) {
    return GraphQLStoreOperation.emptyOperation(0);
  }

  @Override public ResponseNormalizer> networkResponseNormalizer() {
    //noinspection unchecked
    return ResponseNormalizer.NO_OP_NORMALIZER;
  }

  @Override public ResponseNormalizer cacheResponseNormalizer() {
    //noinspection unchecked
    return ResponseNormalizer.NO_OP_NORMALIZER;
  }

  @Override public  R readTransaction(Transaction transaction) {
    return transaction.execute(this);
  }

  @Override public  R writeTransaction(Transaction transaction) {
    return transaction.execute(this);
  }

  @Override public NormalizedCache normalizedCache() {
    return null;
  }

  @Override public CacheKeyResolver cacheKeyResolver() {
    return null;
  }

  @Nonnull @Override
  public  GraphQLStoreOperation read(
      @Nonnull Operation operation) {
    return GraphQLStoreOperation.emptyOperation(null);
  }

  @Nonnull @Override
  public  GraphQLStoreOperation> read(
      @Nonnull Operation operation, @Nonnull ResponseFieldMapper responseFieldMapper,
      @Nonnull ResponseNormalizer responseNormalizer, @Nonnull CacheHeaders cacheHeaders) {
    return GraphQLStoreOperation.emptyOperation(Response.builder(operation).build());
  }

  @Nonnull @Override
  public  GraphQLStoreOperation read(@Nonnull ResponseFieldMapper fieldMapper,
                                                                   @Nonnull CacheKey cacheKey, @Nonnull Operation.Variables variables) {
    return GraphQLStoreOperation.emptyOperation(null);
  }

  @Nonnull @Override
  public  GraphQLStoreOperation> write(
      @Nonnull Operation operation, @Nonnull D operationData) {
    return GraphQLStoreOperation.emptyOperation(Collections.emptySet());
  }

  @Nonnull @Override
  public  GraphQLStoreOperation writeAndPublish(
      @Nonnull Operation operation, @Nonnull D operationData) {
    return GraphQLStoreOperation.emptyOperation(Boolean.FALSE);
  }

  @Nonnull @Override
  public GraphQLStoreOperation> write(@Nonnull GraphqlFragment fragment, @Nonnull CacheKey cacheKey,
                                                  @Nonnull Operation.Variables variables) {
    return GraphQLStoreOperation.emptyOperation(Collections.emptySet());
  }

  @Nonnull @Override
  public GraphQLStoreOperation writeAndPublish(@Nonnull GraphqlFragment fragment, @Nonnull CacheKey cacheKey,
                                                        @Nonnull Operation.Variables variables) {
    return GraphQLStoreOperation.emptyOperation(Boolean.FALSE);
  }

  @Nonnull @Override
  public  GraphQLStoreOperation>
  writeOptimisticUpdates(@Nonnull Operation operation, @Nonnull D operationData, @Nonnull UUID mutationId) {
    return GraphQLStoreOperation.emptyOperation(Collections.emptySet());
  }

  @Nonnull @Override
  public  GraphQLStoreOperation
  writeOptimisticUpdatesAndPublish(@Nonnull Operation operation, @Nonnull D operationData,
      @Nonnull UUID mutationId) {
    return GraphQLStoreOperation.emptyOperation(Boolean.FALSE);
  }

  @Nonnull @Override
  public GraphQLStoreOperation rollbackOptimisticUpdatesAndPublish(@Nonnull UUID mutationId) {
    return GraphQLStoreOperation.emptyOperation(Boolean.FALSE);
  }

  @Nonnull @Override public GraphQLStoreOperation> rollbackOptimisticUpdates(@Nonnull UUID mutationId) {
    return GraphQLStoreOperation.emptyOperation(Collections.emptySet());
  }
}