content: /*
   * Copyright 2024-2025 the original author or 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
   *
   *      https://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 com.alibaba.cloud.ai.graph.async;
  
  import java.util.List;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.Executor;
  import java.util.function.BiConsumer;
  import java.util.function.Consumer;
  import java.util.function.Function;
  import java.util.function.Predicate;
  
  import static java.util.concurrent.CompletableFuture.completedFuture;
  
  @Deprecated
  public interface AsyncGeneratorOperators<E> {
  
  	AsyncGenerator.Data<E> next();
  
  	default Executor executor() {
  		return Runnable::run;
  	}
  
  	/**
  	 * Maps the elements of this generator to a new asynchronous generator.
  	 * @param mapFunction the function to map elements to a new asynchronous counterpart
  	 * @param <U> the type of elements in the new generator
  	 * @return a generator with mapped elements
  	 */
  	default <U> AsyncGenerator<U> map(Function<E, U> mapFunction) {
  		return () -> {
  			final AsyncGenerator.Data<E> next = next();
  			if (next.isDone()) {
  				return AsyncGenerator.Data.done(next.resultValue);
  			}
  			return AsyncGenerator.Data.of(next.data.thenApplyAsync(mapFunction, executor()));
  		};
  	}
  
  	/**
  	 * Maps the elements of this generator to a new asynchronous generator, and flattens
  	 * the resulting nested generators.
  	 * @param mapFunction the function to map elements to a new asynchronous counterpart
  	 * @param <U> the type of elements in the new generator
  	 * @return a generator with mapped and flattened elements
  	 */
  	default <U> AsyncGenerator<U> flatMap(Function<E, CompletableFuture<U>> mapFunction) {
  		return () -> {
  			final AsyncGenerator.Data<E> next = next();
  			if (next.isDone()) {
  				return AsyncGenerator.Data.done(next.resultValue);
  			}
  			return AsyncGenerator.Data.of(next.data.thenComposeAsync(mapFunction, executor()));
  		};
  	}
  
  	/**
  	 * Filters the elements of this generator based on the given predicate. Only elements
  	 * that satisfy the predicate will be included in the resulting generator.
  	 * @param predicate the predicate to test elements against
  	 * @return a generator with elements that satisfy the predicate
  	 */
  	default AsyncGenerator<E> filter(Predicate<E> predicate) {
  		return () -> {
  			AsyncGenerator.Data<E> next = next();
  			while (!next.isDone()) {
  
  				final E value = next.data.join();
  
  				if (predicate.test(value)) {
  					return next;
  				}
  				next = next();
  			}
  			return AsyncGenerator.Data.done(next.resultValue);
  		};
  	}
  
  	/**
  	 * Asynchronously iterates over the elements of the AsyncGenerator and applies the
  	 * given consumer to each element.
  	 * @param consumer the consumer function to be applied to each element
  	 * @return a CompletableFuture representing the completion of the iteration process.
  	 */
  	default CompletableFuture<Object> forEachAsync(Consumer<E> consumer) {
  		CompletableFuture<Object> future = completedFuture(null);
  		for (AsyncGenerator.Data<E> next = next(); !next.isDone(); next = next()) {
  			final AsyncGenerator.Data<E> finalNext = next;
  			if (finalNext.embed != null) {
  				future = future.thenCompose(v -> finalNext.embed.generator.async(executor()).forEachAsync(consumer));
  			}
  			else {
  				future = future
  					.thenCompose(v -> finalNext.data.thenAcceptAsync(consumer, executor()).thenApply(x -> null));
  			}
  		}
  		return future;
  	}
  
  	/**
  	 * Collects elements from the AsyncGenerator asynchronously into a list.
  	 * @param <R> the type of the result list
  	 * @param result the result list to collect elements into
  	 * @param consumer the consumer function for processing elements
  	 * @return a CompletableFuture representing the completion of the collection process
  	 */
  	default <R extends List<E>> CompletableFuture<R> collectAsync(R result, BiConsumer<R, E> consumer) {
  		CompletableFuture<R> future = completedFuture(result);
  		for (AsyncGenerator.Data<E> next = next(); !next.isDone(); next = next()) {
  			final AsyncGenerator.Data<E> finalNext = next;
  			future = future.thenCompose(res -> finalNext.data.thenApplyAsync(v -> {
  				consumer.accept(res, v);
  				return res;
  			}, executor()));
  		}
  		return future;
  	}
  
  }
  