/*

 * Copyright (c)  2017, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package jdk.incubator.sql2;

import java.util.function.BiConsumer;

import java.util.function.Consumer;

import java.util.function.Supplier;

import java.util.stream.Collector;

/**

 * @param <T> the type of the result of this {@link Operation}

 */

public interface RowOperation<T> extends Operation<T> {

  /**

   * A hint to the implementation of how many rows to fetch in each database

   * access. Implementations are free to ignore it.

   * @param rows suggested number of rows to fetch per access

   * @throws IllegalArgumentException if row < 1

   * @throws IllegalStateException if this method had been called previously or

   */

  public RowOperation<T> fetchSize(long rows) throws IllegalArgumentException;

  /**

   * Provides a {@link Collector} to reduce the sequence of rows.The result of

   * the {@link Operation} is the result of calling finisher on the final

   * accumulated result. If the {@link Collector} is

   * {@link Collector.Characteristics#UNORDERED} rows may be accumulated out of

   * order. If the {@link Collector} is

   *

   * @param <A> the type of the accumulator

   * @param <S> the type of the final result

   * @throws IllegalStateException if this method had been called previously or

  public <A, S extends T> RowOperation<T> collect(Collector<? super Result.RowColumn, A, S> c);

  /**

   * final result.

   * @param <S> the type of the accumulated result

   * @param supplier supplies the accumulated result

   */

  public default <S extends T> RowOperation<T> collect(Supplier<S> supplier,

    return collect(Collector.of(supplier, accumulator, (l, r) -> l));

  }

  @Override

  public RowOperation<T> onError(Consumer<Throwable> handler);

}