MurmurHash2 (Lucene 9.0.0 codecs API)

java.lang.Object
- org.apache.lucene.codecs.bloom.HashFunction
- - org.apache.lucene.codecs.bloom.MurmurHash2

```
public final class MurmurHash2
extends HashFunction
```
This is a very fast, non-cryptographic hash suitable for general hash-based lookup. See http://murmurhash.googlepages.com/ for more details.
The C version of MurmurHash 2.0 found at that site was ported to Java by Andrzej Bialecki (ab at getopt org).
The code from getopt.org was adapted by Mark Harwood in the form here as one of a pluggable choice of hashing functions as the core function had to be adapted to work with BytesRefs with offsets and lengths rather than raw byte arrays.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields
Modifier and Type Field Description

static MurmurHash2 INSTANCE

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static int`	`hash(byte[] data, int seed, int offset, int len)`
`int`	`hash(BytesRef br)`	Hashes the contents of the referenced bytes
`static int`	`hash32(byte[] data, int offset, int len)`	Generates 32 bit hash from byte array with default seed value.
`String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - INSTANCE
```
public static final MurmurHash2 INSTANCE
```
- Method Detail
  - hash
```
public static int hash(byte[] data,
                       int seed,
                       int offset,
                       int len)
```
  - hash32
```
public static final int hash32(byte[] data,
                               int offset,
                               int len)
```
    Generates 32 bit hash from byte array with default seed value.
    
    Parameters:
    
    data - byte array to hash
    
    offset - the start position in the array to hash
    
    len - length of the array elements to hash
    
    Returns:
    
    32 bit hash of the given array
  - hash
```
public final int hash(BytesRef br)
```
    Description copied from class: HashFunction
    
    Hashes the contents of the referenced bytes
    
    Specified by:
    
    hash in class HashFunction
    
    Parameters:
    
    br - the data to be hashed
    
    Returns:
    
    the hash of the bytes referenced by bytes.offset and length bytes.length
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object