| /* |
| * Copyright (C) 2010, Google Inc. |
| * 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; |
| |
| /** Compares two sequences primarily based upon hash codes. */ |
| public abstract class LowLevelDiffAlgorithm extends DiffAlgorithm { |
| @Override |
| public <S extends Sequence> EditList diffNonCommon( |
| SequenceComparator<? super S> cmp, S a, S b) { |
| HashedSequencePair<S> p = new HashedSequencePair<>(cmp, a, b); |
| HashedSequenceComparator<S> hc = p.getComparator(); |
| HashedSequence<S> ha = p.getA(); |
| HashedSequence<S> hb = p.getB(); |
| p = null; |
| |
| EditList res = new EditList(); |
| Edit region = new Edit(0, a.size(), 0, b.size()); |
| diffNonCommon(res, hc, ha, hb, region); |
| return res; |
| } |
| |
| /** |
| * Compare two sequences and identify a list of edits between them. |
| * |
| * This method should be invoked only after the two sequences have been |
| * proven to have no common starting or ending elements. The expected |
| * elimination of common starting and ending elements is automatically |
| * performed by the {@link #diff(SequenceComparator, Sequence, Sequence)} |
| * method, which invokes this method using {@link Subsequence}s. |
| * |
| * @param <S> |
| * type of sequence being compared. |
| * @param edits |
| * result list to append the region's edits onto. |
| * @param cmp |
| * the comparator supplying the element equivalence function. |
| * @param a |
| * the first (also known as old or pre-image) sequence. Edits |
| * returned by this algorithm will reference indexes using the |
| * 'A' side: {@link Edit#getBeginA()}, {@link Edit#getEndA()}. |
| * @param b |
| * the second (also known as new or post-image) sequence. Edits |
| * returned by this algorithm will reference indexes using the |
| * 'B' side: {@link Edit#getBeginB()}, {@link Edit#getEndB()}. |
| * @param region |
| * the region being compared within the two sequences. |
| */ |
| public abstract <S extends Sequence> void diffNonCommon(EditList edits, |
| HashedSequenceComparator<S> cmp, HashedSequence<S> a, |
| HashedSequence<S> b, Edit region); |
| } |
