org.rocksdb.util

类 IntComparator

java.lang.Object

org.rocksdb.AbstractNativeReference

org.rocksdb.AbstractImmutableNativeReference

org.rocksdb.RocksCallbackObject

org.rocksdb.AbstractComparator

org.rocksdb.util.IntComparator

所有已实现的接口:

java.lang.AutoCloseable

public final class IntComparator
extends AbstractComparator

This is a Java implementation of a Comparator for Java int keys. This comparator assumes keys are (at least) four bytes, so the caller must guarantee that in accessing other APIs in combination with this comparator. 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 or testing.

字段概要

从类继承的字段 org.rocksdb.RocksCallbackObject

nativeHandle_

从类继承的字段 org.rocksdb.AbstractImmutableNativeReference

owningHandle_

构造器概要

构造器

构造器和说明
IntComparator(ComparatorOptions copt)

方法概要

限定符和类型	方法和说明
int	compare(java.nio.ByteBuffer a, java.nio.ByteBuffer b) Three-way key comparison.
java.lang.String	name() The name of the comparator.

从类继承的方法 org.rocksdb.AbstractComparator

findShortestSeparator, findShortSuccessor, initializeNative, usingDirectBuffers

从类继承的方法 org.rocksdb.RocksCallbackObject

disposeInternal

从类继承的方法 org.rocksdb.AbstractImmutableNativeReference

close, disOwnNativeHandle, isOwningHandle

从类继承的方法 java.lang.Object

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

构造器详细资料

IntComparator

public IntComparator(ComparatorOptions copt)

方法详细资料

name

public java.lang.String name()

从类复制的说明: 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.

指定者:

name 在类中 AbstractComparator

返回:

The name of this comparator implementation

compare

public int compare(java.nio.ByteBuffer a,
                   java.nio.ByteBuffer b)

从类复制的说明: AbstractComparator

Three-way key comparison. Implementations should provide a total order on keys that might be passed to it. The implementation may modify the ByteBuffers passed in, though it would be unconventional to modify the "limit" or any of the underlying bytes. As a callback, RocksJava will ensure that a is a different instance from b.

指定者:

compare 在类中 AbstractComparator

参数:

a - buffer containing the first key in its "remaining" elements

b - buffer containing the second key in its "remaining" elements

返回:

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