Class Fnv1aHashFunction

java.lang.Object

cloud.opencode.base.hash.function.AbstractHashFunction

cloud.opencode.base.hash.function.Fnv1aHashFunction

All Implemented Interfaces:

HashFunction

public final class Fnv1aHashFunction
extends AbstractHashFunction

FNV-1a hash function implementation FNV-1a 哈希函数实现

Fowler-Noll-Vo (FNV) hash is a non-cryptographic hash function with good distribution characteristics. FNV-1a is a variant that XORs the input byte before multiplying.

Fowler-Noll-Vo (FNV) 哈希是一种具有良好分布特性的非加密哈希函数。 FNV-1a 是一种在乘法之前对输入字节进行 XOR 的变体。

Features | 主要功能:

• 32-bit and 64-bit variants - 32位和64位变体
• Simple and fast implementation - 简单快速的实现
• Good distribution - 良好的分布

Usage Examples | 使用示例:

HashCode hash32 = Fnv1aHashFunction.fnv1a_32().hashUtf8("Hello");
HashCode hash64 = Fnv1aHashFunction.fnv1a_64().hashBytes(data);

Security | 安全性:

• Thread-safe: Yes - 线程安全: 是
• Not for cryptographic use - 不用于加密用途

Performance | 性能特性:

• Time complexity: O(n) where n = input size - O(n), n为输入大小
• Space complexity: O(1) - O(1)

Since:

JDK 25, opencode-base-hash V1.0.0

Author:

Leon Soo www.LeonSoo.com

See Also:

• OpenCode.cloud

Nested Class Summary

Nested classes/interfaces inherited from class AbstractHashFunction

AbstractHashFunction.AbstractHasher, AbstractHashFunction.BufferedHasher

Field Summary

Fields inherited from class AbstractHashFunction

bits, name

Method Summary

Modifier and Type	Method	Description
static Fnv1aHashFunction	fnv1a_32()	Creates a 32-bit FNV-1a function 创建32位FNV-1a函数
static Fnv1aHashFunction	fnv1a_64()	Creates a 64-bit FNV-1a function 创建64位FNV-1a函数
HashCode	hashBytes(byte[] input, int offset, int length)	Computes hash of a byte array portion 计算字节数组部分的哈希
Hasher	newHasher()	Creates a new Hasher instance for streaming hash computation 创建新的Hasher实例用于流式哈希计算

Methods inherited from class AbstractHashFunction

bits, hashBytes, hashInt, hashLong, hashObject, name, newHasher, toString

Methods inherited from class Object

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

Methods inherited from interface HashFunction

hashFile, hashInputStream, hashString, hashUtf8

Method Details

fnv1a_32

public static Fnv1aHashFunction fnv1a_32()

Creates a 32-bit FNV-1a function 创建32位FNV-1a函数

Returns:

hash function | 哈希函数

fnv1a_64

public static Fnv1aHashFunction fnv1a_64()

Creates a 64-bit FNV-1a function 创建64位FNV-1a函数

Returns:

hash function | 哈希函数

newHasher

public Hasher newHasher()

Description copied from interface: HashFunction

Creates a new Hasher instance for streaming hash computation 创建新的Hasher实例用于流式哈希计算

Returns:

a new Hasher (stateful, not thread-safe) | 新的Hasher（有状态，非线程安全）

hashBytes

public HashCode hashBytes(byte[] input,
 int offset,
 int length)

Description copied from interface: HashFunction

Computes hash of a byte array portion 计算字节数组部分的哈希

Parameters:

input - input bytes | 输入字节

offset - starting offset | 起始偏移

length - number of bytes to hash | 要哈希的字节数

Returns:

hash code | 哈希码