| /* |
| * Copyright (C) 2010, Sasa Zivkov <sasa.zivkov@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.notes; |
| |
| import java.io.IOException; |
| |
| import org.eclipse.jgit.lib.Constants; |
| import org.eclipse.jgit.lib.ObjectId; |
| import org.eclipse.jgit.lib.ObjectInserter; |
| import org.eclipse.jgit.lib.ObjectLoader; |
| import org.eclipse.jgit.lib.ObjectReader; |
| import org.eclipse.jgit.util.io.UnionInputStream; |
| |
| /** |
| * Default implementation of the {@link org.eclipse.jgit.notes.NoteMerger}. |
| * <p> |
| * If ours and theirs are both non-null, which means they are either both edits |
| * or both adds, then this merger will simply join the content of ours and |
| * theirs (in that order) and return that as the merge result. |
| * <p> |
| * If one or ours/theirs is non-null and the other one is null then the non-null |
| * value is returned as the merge result. This means that an edit/delete |
| * conflict is resolved by keeping the edit version. |
| * <p> |
| * If both ours and theirs are null then the result of the merge is also null. |
| */ |
| public class DefaultNoteMerger implements NoteMerger { |
| |
| /** {@inheritDoc} */ |
| @Override |
| public Note merge(Note base, Note ours, Note theirs, ObjectReader reader, |
| ObjectInserter inserter) throws IOException { |
| if (ours == null) |
| return theirs; |
| |
| if (theirs == null) |
| return ours; |
| |
| if (ours.getData().equals(theirs.getData())) |
| return ours; |
| |
| ObjectLoader lo = reader.open(ours.getData()); |
| ObjectLoader lt = reader.open(theirs.getData()); |
| try (UnionInputStream union = new UnionInputStream(lo.openStream(), |
| lt.openStream())) { |
| ObjectId noteData = inserter.insert(Constants.OBJ_BLOB, |
| lo.getSize() + lt.getSize(), union); |
| return new Note(ours, noteData); |
| } |
| } |
| } |