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.
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 |
HistoricalCsnOrderingMatchingRule
public HistoricalCsnOrderingMatchingRule()
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.