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/*
* 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 {
@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 <S>
* type of Sequence 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 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);
}
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