001 /* 002 * CDDL HEADER START 003 * 004 * The contents of this file are subject to the terms of the 005 * Common Development and Distribution License, Version 1.0 only 006 * (the "License"). You may not use this file except in compliance 007 * with the License. 008 * 009 * You can obtain a copy of the license at 010 * trunk/opends/resource/legal-notices/OpenDS.LICENSE 011 * or https://OpenDS.dev.java.net/OpenDS.LICENSE. 012 * See the License for the specific language governing permissions 013 * and limitations under the License. 014 * 015 * When distributing Covered Code, include this CDDL HEADER in each 016 * file and include the License file at 017 * trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable, 018 * add the following below this CDDL HEADER, with the fields enclosed 019 * by brackets "[]" replaced with your own identifying information: 020 * Portions Copyright [yyyy] [name of copyright owner] 021 * 022 * CDDL HEADER END 023 * 024 * 025 * Copyright 2006-2008 Sun Microsystems, Inc. 026 */ 027 package org.opends.server.backends.jeb; 028 029 import java.util.Comparator; 030 031 /** 032 * A comparator for index modifications. 033 */ 034 public class IndexModComparator implements Comparator<IndexMod> 035 { 036 /** 037 * The index key comparator. 038 */ 039 private Comparator<byte[]> comparator; 040 041 /** 042 * Indicates when true that the entry ID should also factor into the 043 * comparison, in addition to the index key. 044 */ 045 private boolean compareID; 046 047 /** 048 * Create a new comparator for index modifications. 049 * @param comparator The index key comparator. 050 * @param compareID Indicates when true that the entry ID should also factor 051 * into the comparison, in addition to the index key. 052 */ 053 public IndexModComparator(Comparator<byte[]> comparator, boolean compareID) 054 { 055 this.comparator = comparator; 056 this.compareID = compareID; 057 } 058 059 /** 060 * Compares its two arguments for order. Returns a negative integer, 061 * zero, or a positive integer as the first argument is less than, equal 062 * to, or greater than the second. 063 * 064 * @param a the first object to be compared. 065 * @param b the second object to be compared. 066 * @return a negative integer, zero, or a positive integer as the 067 * first argument is less than, equal to, or greater than the 068 * second. 069 */ 070 public int compare(IndexMod a, IndexMod b) 071 { 072 int r = comparator.compare(a.key, b.key); 073 if (compareID) 074 { 075 if (r == 0) 076 { 077 r = a.value.compareTo(b.value); 078 } 079 } 080 return r; 081 } 082 }