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/*
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* Copyright (c) 2017, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.incubator.sql2;
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import java.util.function.BiConsumer;
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import java.util.function.Consumer;
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import java.util.function.Supplier;
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import java.util.stream.Collector;
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/**
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* A {@link RowOperation} is a database operation that returns a row sequence.
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*
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* @param <T> the type of the result of this {@link Operation}
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*/
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public interface RowOperation<T> extends Operation<T> {
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/**
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* A hint to the implementation of how many rows to fetch in each database
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* access. Implementations are free to ignore it.
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*
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* @param rows suggested number of rows to fetch per access
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* @return this {@link RowOperation}
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* @throws IllegalArgumentException if row < 1
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* @throws IllegalStateException if this method had been called previously or
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* this Operation has been submitted.
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*/
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public RowOperation<T> fetchSize(long rows) throws IllegalArgumentException;
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/**
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* Provides a {@link Collector} to reduce the sequence of rows.The result of
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* the {@link Operation} is the result of calling finisher on the final
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* accumulated result. If the {@link Collector} is
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* {@link Collector.Characteristics#UNORDERED} rows may be accumulated out of
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* order. If the {@link Collector} is
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* {@link Collector.Characteristics#CONCURRENT} then the sequence of rows may be
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* split into subsequences that are reduced separately and then combined.
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*
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* @param <A> the type of the accumulator
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* @param <S> the type of the final result
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* @param c the Collector. Not null.
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* @return This RowOperation
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* @throws IllegalStateException if this method had been called previously or
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* this Operation has been submitted.
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*/
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public <A, S extends T> RowOperation<T> collect(Collector<? super Result.RowColumn, A, S> c);
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/**
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* Convenience method to collect the rows when the accumulated result is the
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* final result.
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*
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* @param <S> the type of the accumulated result
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* @param supplier supplies the accumulated result
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* @param accumulator accumulates each RowColumn into the accumulated result
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* @return this RowOperation
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*/
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public default <S extends T> RowOperation<T> collect(Supplier<S> supplier,
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BiConsumer<S, Result.RowColumn> accumulator) {
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return collect(Collector.of(supplier, accumulator, (l, r) -> l));
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}
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@Override
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public RowOperation<T> onError(Consumer<Throwable> handler);
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}
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