| /* |
| * Copyright (C) 2015, Matthias Sohn <matthias.sohn@sap.com> |
| * and other copyright owners as documented in the project's IP log. |
| * |
| * This program and the accompanying materials are made available |
| * under the terms of the Eclipse Distribution License v1.0 which |
| * accompanies this distribution, is reproduced below, and is |
| * available at http://www.eclipse.org/org/documents/edl-v10.php |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * |
| * - Neither the name of the Eclipse Foundation, Inc. nor the |
| * names of its contributors may be used to endorse or promote |
| * products derived from this software without specific prior |
| * written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| 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 |
| */ |
| 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 |
| */ |
| 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. |
| */ |
| public @Nullable AnyLongObjectId getId() { |
| return id; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void write(int b) throws IOException { |
| out.write(b); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void write(byte[] b) throws IOException { |
| out.write(b); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void write(byte[] b, int off, int len) throws IOException { |
| out.write(b, off, len); |
| } |
| |
| /** {@inheritDoc} */ |
| @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; |
| } |
| } |