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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;
/**
* 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];
}
}
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