| /* |
| * 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; |
| |
| /** |
| * Wrap another comparator for use with |
| * {@link org.eclipse.jgit.diff.Subsequence}. |
| * <p> |
| * This comparator acts as a proxy for the real comparator, translating element |
| * indexes on the fly by adding the subsequence's begin offset to them. |
| * Comparators of this type must be used with a |
| * {@link org.eclipse.jgit.diff.Subsequence}. |
| * |
| * @param <S> |
| * the base sequence type. |
| */ |
| public final class SubsequenceComparator<S extends Sequence> extends |
| SequenceComparator<Subsequence<S>> { |
| private final SequenceComparator<? super S> cmp; |
| |
| /** |
| * Construct a comparator wrapping another comparator. |
| * |
| * @param cmp |
| * the real comparator. |
| */ |
| public SubsequenceComparator(SequenceComparator<? super S> cmp) { |
| this.cmp = cmp; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean equals(Subsequence<S> a, int ai, Subsequence<S> b, int bi) { |
| return cmp.equals(a.base, ai + a.begin, b.base, bi + b.begin); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int hash(Subsequence<S> seq, int ptr) { |
| return cmp.hash(seq.base, ptr + seq.begin); |
| } |
| } |