| /* |
| * 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.HashedSequence}. |
| * <p> |
| * This comparator acts as a proxy for the real comparator, evaluating the |
| * cached hash code before testing the underlying comparator's equality. |
| * Comparators of this type must be used with a |
| * {@link org.eclipse.jgit.diff.HashedSequence}. |
| * <p> |
| * To construct an instance of this type use |
| * {@link org.eclipse.jgit.diff.HashedSequencePair}. |
| * |
| * @param <S> |
| * the base sequence type. |
| */ |
| public final class HashedSequenceComparator<S extends Sequence> extends |
| SequenceComparator<HashedSequence<S>> { |
| private final SequenceComparator<? super S> cmp; |
| |
| HashedSequenceComparator(SequenceComparator<? super S> cmp) { |
| this.cmp = cmp; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public boolean equals(HashedSequence<S> a, int ai, // |
| HashedSequence<S> b, int bi) { |
| return a.hashes[ai] == b.hashes[bi] |
| && cmp.equals(a.base, ai, b.base, bi); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public int hash(HashedSequence<S> seq, int ptr) { |
| return seq.hashes[ptr]; |
| } |
| } |