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/*
 * Copyright The Stargate Authors
 *
 * 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 io.stargate.graphql.schema.graphqlfirst.util;

import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;

public class CompletableFutures {

  public static  CompletableFuture failedFuture(Throwable cause) {
    CompletableFuture future = new CompletableFuture<>();
    future.completeExceptionally(cause);
    return future;
  }

  /** Returns a future of all the results, or a failed future if any of the inputs fails. */
  public static  CompletableFuture> sequence(List> futures) {
    return CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]))
        .thenApply(v -> futures.stream().map(CompletableFuture::join).collect(Collectors.toList()));
  }
}




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