@ParametersAreNonnullByDefault

Package com.google.common.hash

Hash functions and related structures.

See the Guava User Guide article on hashing.

Interface Summary

Interface	Description
BloomFilter.Strategy	A strategy to translate T instances, to numHashFunctions bit indexes.
Funnel<T>	An object which can send data from an object of type T into a PrimitiveSink.
Hasher	A PrimitiveSink that can compute a hash code after reading the input.
HashFunction	A hash function is a collision-averse pure function that maps an arbitrary block of data to a number called a hash code.
ImmutableSupplier<T>	Explicitly named subinterface of Supplier that can be marked @Immutable.
LittleEndianByteArray.LittleEndianBytes	Common interface for retrieving a 64-bit long from a little-endian byte array.
LongAddable	Abstract interface for objects that can concurrently add longs.
PrimitiveSink	An object which can receive a stream of primitive values.

Class Summary

Class	Description
AbstractByteHasher	Abstract Hasher that handles converting primitives to bytes using a scratch ByteBuffer and streams all bytes to a sink to compute the hash.
AbstractCompositeHashFunction	An abstract composition of multiple hash functions.
AbstractHasher	An abstract implementation of Hasher, which only requires subtypes to implement Hasher.putByte(byte).
AbstractHashFunction	Skeleton implementation of HashFunction in terms of HashFunction.newHasher().
AbstractNonStreamingHashFunction	Skeleton implementation of HashFunction, appropriate for non-streaming algorithms.
AbstractNonStreamingHashFunction.ExposedByteArrayOutputStream
AbstractStreamingHasher	A convenience base class for implementors of Hasher; handles accumulating data until an entire "chunk" (of implementation-dependent length) is ready to be hashed.
BloomFilter<T>	A Bloom filter for instances of T.
BloomFilter.SerialForm<T>
BloomFilterStrategies.LockFreeBitArray	Models a lock-free array of bits.
ChecksumHashFunction	HashFunction adapter for Checksum instances.
Crc32cHashFunction	This class generates a CRC32C checksum, defined by RFC 3720, Section 12.1.
Crc32cHashFunction.Crc32cHasher
FarmHashFingerprint64	Implementation of FarmHash Fingerprint64, an open-source fingerprinting algorithm for strings.
Funnels	Funnels for common types.
Funnels.SequentialFunnel<E>
Funnels.SinkAsStream
Funnels.StringCharsetFunnel
Funnels.StringCharsetFunnel.SerializedForm
HashCode	An immutable hash code of arbitrary bit length.
HashCode.BytesHashCode
HashCode.IntHashCode
HashCode.LongHashCode
Hashing	Static methods to obtain HashFunction instances, and other static hashing-related utilities.
Hashing.ConcatenatedHashFunction
Hashing.LinearCongruentialGenerator	Linear CongruentialGenerator to use for consistent hashing.
Hashing.Md5Holder
Hashing.Sha1Holder
Hashing.Sha256Holder
Hashing.Sha384Holder
Hashing.Sha512Holder
HashingInputStream	An InputStream that maintains a hash of the data read from it.
HashingOutputStream	An OutputStream that maintains a hash of the data written to it.
LittleEndianByteArray	Utility functions for loading and storing values from a byte array.
LongAddables	Source of LongAddable objects that deals with GWT, Unsafe, and all that.
LongAddables.PureJavaLongAddable
LongAdder	One or more variables that together maintain an initially zero long sum.
MacHashFunction	HashFunction adapter for Mac instances.
MacHashFunction.MacHasher	Hasher that updates a Mac (message authentication code).
MessageDigestHashFunction	HashFunction adapter for MessageDigest instances.
MessageDigestHashFunction.MessageDigestHasher	Hasher that updates a message digest.
MessageDigestHashFunction.SerializedForm
Murmur3_128HashFunction	See MurmurHash3_x64_128 in the C++ implementation.
Murmur3_128HashFunction.Murmur3_128Hasher
Murmur3_32HashFunction	See MurmurHash3_x86_32 in the C++ implementation.
Murmur3_32HashFunction.Murmur3_32Hasher
SipHashFunction	HashFunction implementation of SipHash-c-d.
SipHashFunction.SipHasher
Striped64	A package-local class holding common representation and mechanics for classes supporting dynamic striping on 64bit values.
Striped64.Cell	Padded variant of AtomicLong supporting only raw accesses plus CAS.

Enum Summary

Enum	Description
BloomFilterStrategies	Collections of strategies of generating the k * log(M) bits required for an element to be mapped to a BloomFilter of M bits and k hash functions.
Funnels.ByteArrayFunnel
Funnels.IntegerFunnel
Funnels.LongFunnel
Funnels.UnencodedCharsFunnel
Hashing.ChecksumType
LittleEndianByteArray.JavaLittleEndianBytes	Fallback implementation for when Unsafe is not available in our current environment.
LittleEndianByteArray.UnsafeByteArray	The only reference to Unsafe is in this nested class.