Package org.elasticsearch.common.hash
Enum MurmurHash3
- java.lang.Object
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- java.lang.Enum<MurmurHash3>
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- org.elasticsearch.common.hash.MurmurHash3
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Comparable<MurmurHash3>
public enum MurmurHash3 extends java.lang.Enum<MurmurHash3>
MurmurHash3 hashing functions.
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
MurmurHash3.Hash128
A 128-bits hash.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description protected static long
fmix(long k)
protected static long
getblock(byte[] key, int offset, int index)
static MurmurHash3.Hash128
hash128(byte[] key, int offset, int length, long seed, MurmurHash3.Hash128 hash)
Compute the hash of the MurmurHash3_x64_128 hashing function.static MurmurHash3
valueOf(java.lang.String name)
Returns the enum constant of this type with the specified name.static MurmurHash3[]
values()
Returns an array containing the constants of this enum type, in the order they are declared.
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Method Detail
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values
public static MurmurHash3[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:for (MurmurHash3 c : MurmurHash3.values()) System.out.println(c);
- Returns:
- an array containing the constants of this enum type, in the order they are declared
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valueOf
public static MurmurHash3 valueOf(java.lang.String name)
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)- Parameters:
name
- the name of the enum constant to be returned.- Returns:
- the enum constant with the specified name
- Throws:
java.lang.IllegalArgumentException
- if this enum type has no constant with the specified namejava.lang.NullPointerException
- if the argument is null
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getblock
protected static long getblock(byte[] key, int offset, int index)
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fmix
protected static long fmix(long k)
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hash128
public static MurmurHash3.Hash128 hash128(byte[] key, int offset, int length, long seed, MurmurHash3.Hash128 hash)
Compute the hash of the MurmurHash3_x64_128 hashing function. Note, this hashing function might be used to persist hashes, so if the way hashes are computed changes for some reason, it needs to be addressed (like in BloomFilter and MurmurHashField).
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