content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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.activej.promise;
  
  import org.jetbrains.annotations.ApiStatus;
  import org.jetbrains.annotations.Nullable;
  
  /**
   * Helps to create sequent chains of {@code Promise}s.
   */
  @ApiStatus.Internal
  public abstract class NextPromise<T, R> extends AbstractPromise<R> implements SettableCallback<R> {
  	public abstract void acceptNext(T result, @Nullable Exception e);
  
  	@Override
  	public void set(R result, @Nullable Exception e) {
  		complete(result, e);
  	}
  
  	@Override
  	public void set(R result) {
  		complete(result);
  	}
  
  	@Override
  	public void setException(Exception e) {
  		completeExceptionally(e);
  	}
  
  	@Override
  	public boolean trySet(R result, @Nullable Exception e) {
  		return tryComplete(result, e);
  	}
  
  	@Override
  	public boolean trySet(R result) {
  		return tryComplete(result);
  	}
  
  	@Override
  	public boolean trySetException(Exception e) {
  		return tryCompleteExceptionally(e);
  	}
  }
  