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- /*
- * 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;
-
- /**
- * Wrap another comparator for use with {@link HashedSequence}.
- *
- * 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 HashedSequence}.
- *
- * To construct an instance of this type use {@link 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;
- }
-
- @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);
- }
-
- @Override
- public int hash(HashedSequence<S> seq, int ptr) {
- return seq.hashes[ptr];
- }
- }
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