| /* |
| * Copyright (C) 2011, Stefan Lay <stefan.lay@.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.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 |
| } |
| } |