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/*
* Copyright (C) 2017, Google Inc. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.storage.dfs;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.eclipse.jgit.internal.storage.reftable.ReftableReader;
/**
* Tracks multiple open
* {@link org.eclipse.jgit.internal.storage.reftable.ReftableReader} instances.
*/
public class DfsReftableStack implements AutoCloseable {
/**
* Opens a stack of tables for reading.
*
* @param ctx
* context to read the tables with. This {@code ctx} will be
* retained by the stack and each of the table readers.
* @param files
* the tables to open.
* @return stack reference to close the tables.
* @throws java.io.IOException
* a table could not be opened
*/
public static DfsReftableStack open(DfsReader ctx, List<DfsReftable> files)
throws IOException {
DfsReftableStack stack = new DfsReftableStack(files.size());
boolean close = true;
try {
for (DfsReftable t : files) {
stack.files.add(t);
stack.tables.add(t.open(ctx));
}
close = false;
return stack;
} finally {
if (close) {
stack.close();
}
}
}
private final List<DfsReftable> files;
private final List<ReftableReader> tables;
private DfsReftableStack(int tableCnt) {
this.files = new ArrayList<>(tableCnt);
this.tables = new ArrayList<>(tableCnt);
}
/**
* Get unmodifiable list of DfsRefatble files
*
* @return unmodifiable list of DfsRefatble files, in the same order the
* files were passed to {@link #open(DfsReader, List)}.
*/
public List<DfsReftable> files() {
return Collections.unmodifiableList(files);
}
/**
* Get unmodifiable list of tables
*
* @return unmodifiable list of tables, in the same order the files were
* passed to {@link #open(DfsReader, List)}.
*/
public List<ReftableReader> readers() {
return Collections.unmodifiableList(tables);
}
@Override
public void close() {
for (ReftableReader t : tables) {
try {
t.close();
} catch (IOException e) {
// Ignore close failures.
}
}
}
}
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