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- /*
- * Copyright (C) 2011, Stefan Lay <stefan.lay@.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.diff;
-
- import java.io.IOException;
- import java.io.OutputStream;
- import java.security.DigestOutputStream;
- import java.security.MessageDigest;
-
- import org.eclipse.jgit.lib.Constants;
- import org.eclipse.jgit.lib.ObjectId;
- import org.eclipse.jgit.util.io.NullOutputStream;
-
- /**
- * A DiffFormatter used to calculate the patch-id of the diff.
- */
- public class PatchIdDiffFormatter extends DiffFormatter {
-
- private final MessageDigest digest;
-
- /** Initialize a formatter to compute a patch id. */
- public PatchIdDiffFormatter() {
- super(new DigestOutputStream(NullOutputStream.INSTANCE,
- Constants.newMessageDigest()));
- digest = ((DigestOutputStream) getOutputStream()).getMessageDigest();
- }
-
- /**
- * Should be called after having called one of the format methods
- *
- * @return the patch id calculated for the provided diff.
- */
- public ObjectId getCalulatedPatchId() {
- return ObjectId.fromRaw(digest.digest());
- }
-
- @Override
- protected void writeHunkHeader(int aStartLine, int aEndLine,
- int bStartLine, int bEndLine) throws IOException {
- // The hunk header is not taken into account for patch id calculation
- }
-
- @Override
- protected void formatIndexLine(OutputStream o, DiffEntry ent)
- throws IOException {
- // The index line is not taken into account for patch id calculation
- }
- }
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