001/*
002 * Sonar, open source software quality management tool.
003 * Copyright (C) 2008-2012 SonarSource
004 * mailto:contact AT sonarsource DOT com
005 *
006 * Sonar is free software; you can redistribute it and/or
007 * modify it under the terms of the GNU Lesser General Public
008 * License as published by the Free Software Foundation; either
009 * version 3 of the License, or (at your option) any later version.
010 *
011 * Sonar is distributed in the hope that it will be useful,
012 * but WITHOUT ANY WARRANTY; without even the implied warranty of
013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014 * Lesser General Public License for more details.
015 *
016 * You should have received a copy of the GNU Lesser General Public
017 * License along with Sonar; if not, write to the Free Software
018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
019 */
020package org.sonar.plugins.core.timemachine.tracking;
021
022/**
023 * Wrap another {@link SequenceComparator} for use with {@link HashedSequence}.
024 */
025public class HashedSequenceComparator<S extends Sequence> implements SequenceComparator<HashedSequence<S>> {
026
027  private final SequenceComparator<? super S> cmp;
028
029  public HashedSequenceComparator(SequenceComparator<? super S> cmp) {
030    this.cmp = cmp;
031  }
032
033  public boolean equals(HashedSequence<S> a, int ai, HashedSequence<S> b, int bi) {
034    if (a.hashes[ai] == b.hashes[bi]) {
035      return cmp.equals(a.base, ai, b.base, bi);
036    }
037    return false;
038  }
039
040  public int hash(HashedSequence<S> seq, int i) {
041    return seq.hashes[i];
042  }
043
044}