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| | | /* |
| | | * CDDL HEADER START |
| | | * |
| | | * The contents of this file are subject to the terms of the |
| | | * Common Development and Distribution License, Version 1.0 only |
| | | * (the "License"). You may not use this file except in compliance |
| | | * with the License. |
| | | * |
| | | * You can obtain a copy of the license at |
| | | * trunk/opends/resource/legal-notices/OpenDS.LICENSE |
| | | * or https://OpenDS.dev.java.net/OpenDS.LICENSE. |
| | | * See the License for the specific language governing permissions |
| | | * and limitations under the License. |
| | | * |
| | | * When distributing Covered Code, include this CDDL HEADER in each |
| | | * file and include the License file at |
| | | * trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable, |
| | | * add the following below this CDDL HEADER, with the fields enclosed |
| | | * by brackets "[]" replaced with your own identifying information: |
| | | * Portions Copyright [yyyy] [name of copyright owner] |
| | | * |
| | | * CDDL HEADER END |
| | | * |
| | | * |
| | | * Portions Copyright 2007 Sun Microsystems, Inc. |
| | | */ |
| | | |
| | | package org.opends.server.synchronization.plugin; |
| | | |
| | | import org.opends.server.api.OrderingMatchingRule; |
| | | import org.opends.server.core.DirectoryServer; |
| | | |
| | | import java.util.Comparator; |
| | | |
| | | /** |
| | | * This class maintains compatibility with databases created before the |
| | | * org.opends.server.synchronization package was renamed. The class |
| | | * was used as a JE custom btree comparator in the ds-sync-hist attribute |
| | | * index, so older databases expect it to exist. This class now just |
| | | * implements the comparator interface and delegates to the matching rule |
| | | * comparator found in the replication package. |
| | | */ |
| | | public class HistoricalCsnOrderingMatchingRule implements Comparator<byte[]> |
| | | { |
| | | /** |
| | | * The historicalCsnOrderingMatch matching rule in the replication package. |
| | | */ |
| | | private static OrderingMatchingRule rule = null; |
| | | |
| | | |
| | | /** |
| | | * Compares its two arguments for order. Returns a negative integer, |
| | | * zero, or a positive integer as the first argument is less than, equal |
| | | * to, or greater than the second.<p> |
| | | * <p/> |
| | | * The implementor must ensure that <tt>sgn(compare(x, y)) == |
| | | * -sgn(compare(y, x))</tt> for all <tt>x</tt> and <tt>y</tt>. (This |
| | | * implies that <tt>compare(x, y)</tt> must throw an exception if and only |
| | | * if <tt>compare(y, x)</tt> throws an exception.)<p> |
| | | * <p/> |
| | | * The implementor must also ensure that the relation is transitive: |
| | | * <tt>((compare(x, y)>0) && (compare(y, z)>0))</tt> implies |
| | | * <tt>compare(x, z)>0</tt>.<p> |
| | | * <p/> |
| | | * Finally, the implementer must ensure that <tt>compare(x, y)==0</tt> |
| | | * implies that <tt>sgn(compare(x, z))==sgn(compare(y, z))</tt> for all |
| | | * <tt>z</tt>.<p> |
| | | * <p/> |
| | | * It is generally the case, but <i>not</i> strictly required that |
| | | * <tt>(compare(x, y)==0) == (x.equals(y))</tt>. Generally speaking, |
| | | * any comparator that violates this condition should clearly indicate |
| | | * this fact. The recommended language is "Note: this comparator |
| | | * imposes orderings that are inconsistent with equals." |
| | | * |
| | | * @param o1 the first object to be compared. |
| | | * @param o2 the second object to be compared. |
| | | * @return a negative integer, zero, or a positive integer as the |
| | | * first argument is less than, equal to, or greater than the |
| | | * second. |
| | | */ |
| | | public int compare(byte[] o1, byte[] o2) |
| | | { |
| | | if (rule == null) |
| | | { |
| | | rule = DirectoryServer. |
| | | getOrderingMatchingRule("historicalCsnOrderingMatch"); |
| | | } |
| | | return rule.compare(o1, o2); |
| | | } |
| | | |
| | | } |