org.rocksdb.util

Class ReverseBytewiseComparator

java.lang.Object

org.rocksdb.AbstractNativeReference

org.rocksdb.AbstractImmutableNativeReference

org.rocksdb.RocksCallbackObject

org.rocksdb.AbstractComparator<Slice>

org.rocksdb.Comparator

org.rocksdb.util.BytewiseComparator

org.rocksdb.util.ReverseBytewiseComparator

All Implemented Interfaces:

java.lang.AutoCloseable

public class ReverseBytewiseComparator
extends BytewiseComparator

This is a Java Native implementation of the C++ equivalent ReverseBytewiseComparatorImpl using Slice The performance of Comparators implemented in Java is always less than their C++ counterparts due to the bridging overhead, as such you likely don't want to use this apart from benchmarking and you most likely instead wanted BuiltinComparator.REVERSE_BYTEWISE_COMPARATOR

Field Summary

Fields inherited from class org.rocksdb.RocksCallbackObject

nativeHandle_

Constructor Summary

Constructors

Constructor and Description
ReverseBytewiseComparator(ComparatorOptions copt)

Method Summary

Modifier and Type	Method and Description
int	compare(Slice a, Slice b) Three-way key comparison
java.lang.String	name() The name of the comparator.

Methods inherited from class org.rocksdb.util.BytewiseComparator

findShortestSeparator, findShortSuccessor

Methods inherited from class org.rocksdb.Comparator

initializeNative

Methods inherited from class org.rocksdb.RocksCallbackObject

disposeInternal

Methods inherited from class org.rocksdb.AbstractImmutableNativeReference

close, disOwnNativeHandle, isOwningHandle

Methods inherited from class org.rocksdb.AbstractNativeReference

dispose, finalize

Methods inherited from class java.lang.Object

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

Constructor Detail

ReverseBytewiseComparator

public ReverseBytewiseComparator(ComparatorOptions copt)

Method Detail

name

public java.lang.String name()

Description copied from class: AbstractComparator

The name of the comparator. Used to check for comparator mismatches (i.e., a DB created with one comparator is accessed using a different comparator). A new name should be used whenever the comparator implementation changes in a way that will cause the relative ordering of any two keys to change. Names starting with "rocksdb." are reserved and should not be used.

Overrides:

name in class BytewiseComparator

Returns:

The name of this comparator implementation

compare

public int compare(Slice a,
                   Slice b)

Description copied from class: AbstractComparator

Three-way key comparison

Overrides:

compare in class BytewiseComparator

Parameters:

a - Slice access to first key

b - Slice access to second key

Returns:

Should return either: 1) < 0 if "a" < "b" 2) == 0 if "a" == "b" 3) > 0 if "a" > "b"