| /* |
| * Copyright (C) 2010, Google Inc. 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; |
| |
| /** |
| * Compares two sequences primarily based upon hash codes. |
| */ |
| public abstract class LowLevelDiffAlgorithm extends DiffAlgorithm { |
| /** {@inheritDoc} */ |
| @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 org.eclipse.jgit.diff.Subsequence}s. |
| * |
| * @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 org.eclipse.jgit.diff.Edit#getBeginA()}, |
| * {@link org.eclipse.jgit.diff.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 org.eclipse.jgit.diff.Edit#getBeginB()}, |
| * {@link org.eclipse.jgit.diff.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); |
| } |