com.apollographql.apollo.internal.ResponseFieldMapperFactory Maven / Gradle / Ivy

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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;

import com.apollographql.apollo.api.Operation;
import com.apollographql.apollo.api.ResponseFieldMapper;

import java.util.concurrent.ConcurrentHashMap;

import javax.annotation.Nonnull;

import static com.apollographql.apollo.api.internal.Utils.checkNotNull;

public final class ResponseFieldMapperFactory {
  private final ConcurrentHashMap pool = new ConcurrentHashMap<>();

  @Nonnull public ResponseFieldMapper create(@Nonnull Operation operation) {
    checkNotNull(operation, "operation == null");
    Class operationClass = operation.getClass();
    ResponseFieldMapper mapper = pool.get(operationClass);
    if (mapper != null) {
      return mapper;
    }
    pool.putIfAbsent(operationClass, operation.responseFieldMapper());
    return pool.get(operationClass);
  }
}