org.opends.server.synchronization.plugin
Class HistoricalCsnOrderingMatchingRule

java.lang.Object
  org.opends.server.synchronization.plugin.HistoricalCsnOrderingMatchingRule

All Implemented Interfaces:

java.util.Comparator<byte[]>

public class HistoricalCsnOrderingMatchingRule
extends java.lang.Object
implements java.util.Comparator<byte[]>

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.

Constructor Summary

HistoricalCsnOrderingMatchingRule()

Method Summary

int	compare(byte[] o1, byte[] o2) Compares its two arguments for order.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Comparator

equals

Constructor Detail

HistoricalCsnOrderingMatchingRule

public HistoricalCsnOrderingMatchingRule()

Method Detail

compare

public int compare(byte[] o1,
                   byte[] o2)

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.

The implementor must ensure that sgn(compare(x, y)) == -sgn(compare(y, x)) for all x and y. (This implies that compare(x, y) must throw an exception if and only if compare(y, x) throws an exception.)

The implementor must also ensure that the relation is transitive: ((compare(x, y)>0) && (compare(y, z)>0)) implies compare(x, z)>0.

Finally, the implementer must ensure that compare(x, y)==0 implies that sgn(compare(x, z))==sgn(compare(y, z)) for all z.

It is generally the case, but not strictly required that (compare(x, y)==0) == (x.equals(y)). 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."

Specified by:

compare in interface java.util.Comparator<byte[]>

Parameters:

o1 - the first object to be compared.

o2 - the second object to be compared.

Returns:

a negative integer, zero, or a positive integer as the first argument is less than, equal to, or greater than the second.