| /* |
| * 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 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 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; |
| } |
| |
| @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); |
| } |
| |
| @Override |
| public int hash(Subsequence<S> seq, int ptr) { |
| return cmp.hash(seq.base, ptr + seq.begin); |
| } |
| } |
