dfs: helper to open multiple reftables
ReftableStack maintains multiple open reftables in an AutoCloseable format, making it easier for higher level code to handle multiple files. Change-Id: I7ac35c18e67b7e771fb3de29169d1ee50fab62ca
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/*
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* Copyright (C) 2017, Google Inc.
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* and other copyright owners as documented in the project's IP log.
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*
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* This program and the accompanying materials are made available
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* under the terms of the Eclipse Distribution License v1.0 which
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* accompanies this distribution, is reproduced below, and is
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* available at http://www.eclipse.org/org/documents/edl-v10.php
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* - Neither the name of the Eclipse Foundation, Inc. nor the
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* names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.eclipse.jgit.internal.storage.dfs;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import org.eclipse.jgit.internal.storage.reftable.Reftable;
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/** Tracks multiple open {@link Reftable} instances. */
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public class ReftableStack implements AutoCloseable {
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/**
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* Opens a stack of tables for reading.
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*
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* @param ctx
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* context to read the tables with. This {@code ctx} will be
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* retained by the stack and each of the table readers.
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* @param tables
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* the tables to open.
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* @return stack reference to close the tables.
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* @throws IOException
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* a table could not be opened
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*/
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public static ReftableStack open(DfsReader ctx, List<DfsReftable> tables)
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throws IOException {
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ReftableStack stack = new ReftableStack(tables.size());
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boolean close = true;
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try {
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for (DfsReftable t : tables) {
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stack.tables.add(t.open(ctx));
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}
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close = false;
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return stack;
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} finally {
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if (close) {
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stack.close();
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}
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}
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}
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private final List<Reftable> tables;
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private ReftableStack(int tableCnt) {
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this.tables = new ArrayList<>(tableCnt);
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}
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/**
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* @return unmodifiable list of tables, in the same order the files were
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* passed to {@link #open(DfsReader, List)}.
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*/
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public List<Reftable> readers() {
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return Collections.unmodifiableList(tables);
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}
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@Override
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public void close() {
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for (Reftable t : tables) {
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try {
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t.close();
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} catch (IOException e) {
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// Ignore close failures.
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}
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}
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}
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}
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