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/*
* Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com> 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.lfs.internal;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Path;
import java.security.DigestOutputStream;
import java.text.MessageFormat;
import org.eclipse.jgit.annotations.Nullable;
import org.eclipse.jgit.internal.storage.file.LockFile;
import org.eclipse.jgit.lfs.errors.CorruptLongObjectException;
import org.eclipse.jgit.lfs.lib.AnyLongObjectId;
import org.eclipse.jgit.lfs.lib.Constants;
import org.eclipse.jgit.lfs.lib.LongObjectId;
/**
* Output stream writing content to a
* {@link org.eclipse.jgit.internal.storage.file.LockFile} which is committed on
* close(). The stream checks if the hash of the stream content matches the id.
*/
public class AtomicObjectOutputStream extends OutputStream {
private LockFile locked;
private DigestOutputStream out;
private boolean aborted;
private AnyLongObjectId id;
/**
* Constructor for AtomicObjectOutputStream.
*
* @param path
* a {@link java.nio.file.Path} object.
* @param id
* a {@link org.eclipse.jgit.lfs.lib.AnyLongObjectId} object.
* @throws java.io.IOException
* if an IO error occurred
*/
public AtomicObjectOutputStream(Path path, AnyLongObjectId id)
throws IOException {
locked = new LockFile(path.toFile());
locked.lock();
this.id = id;
out = new DigestOutputStream(locked.getOutputStream(),
Constants.newMessageDigest());
}
/**
* Constructor for AtomicObjectOutputStream.
*
* @param path
* a {@link java.nio.file.Path} object.
* @throws java.io.IOException
* if an IO error occurred
*/
public AtomicObjectOutputStream(Path path) throws IOException {
this(path, null);
}
/**
* Get the <code>id</code>.
*
* @return content hash of the object which was streamed through this
* stream. May return {@code null} if called before closing this
* stream.
*/
@Nullable
public AnyLongObjectId getId() {
return id;
}
@Override
public void write(int b) throws IOException {
out.write(b);
}
@Override
public void write(byte[] b) throws IOException {
out.write(b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
out.write(b, off, len);
}
@Override
public void close() throws IOException {
out.close();
if (!aborted) {
if (id != null) {
verifyHash();
} else {
id = LongObjectId.fromRaw(out.getMessageDigest().digest());
}
locked.commit();
}
}
private void verifyHash() {
AnyLongObjectId contentHash = LongObjectId
.fromRaw(out.getMessageDigest().digest());
if (!contentHash.equals(id)) {
abort();
throw new CorruptLongObjectException(id, contentHash,
MessageFormat.format(LfsText.get().corruptLongObject,
contentHash, id));
}
}
/**
* Aborts the stream. Temporary file will be deleted
*/
public void abort() {
locked.unlock();
aborted = true;
}
}
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