Move AtomicObjectOutputStream to lfs/internal

The class AtomicObjectOutputStream should be available to all lfs
related classes, not only to the server side. Move the class from
org.eclipse.jgit.lfs.server.fs to org.eclipse.jgit.lfs.internal to
achieve that.

Change-Id: I028e1c9ec7c21f316340b21d558b9a6b77e2060d

2 files changed, 129 insertions, 0 deletions

diff --git a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/AtomicObjectOutputStream.java b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/AtomicObjectOutputStream.java
new file mode 100644
index 0000000000..7e050b1e78
--- /dev/null
+++ b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/AtomicObjectOutputStream.java
@@ -0,0 +1,128 @@
+/*
+ * 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.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 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;
+
+	/**
+	 * @param path
+	 * @param id
+	 * @throws 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());
+	}
+
+	@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) {
+			verifyHash();
+			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;
+	}
+}
\ No newline at end of file
diff --git a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/LfsText.java b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/LfsText.java
index 0aad5c9dac..c76df39354 100644
--- a/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/LfsText.java
+++ b/org.eclipse.jgit.lfs/src/org/eclipse/jgit/lfs/internal/LfsText.java
@@ -58,6 +58,7 @@ public class LfsText extends TranslationBundle {
 	}
 
 	// @formatter:off
+	/***/ public String corruptLongObject;
 	/***/ public String inconsistentMediafileLength;
 	/***/ public String incorrectLONG_OBJECT_ID_LENGTH;
 	/***/ public String invalidLongId;