Package com.google.common.hash

Class MessageDigestHashFunction

java.lang.Object

com.google.common.hash.AbstractHashFunction

com.google.common.hash.MessageDigestHashFunction

All Implemented Interfaces:

HashFunction, java.io.Serializable

final class MessageDigestHashFunction
extends AbstractHashFunction
implements java.io.Serializable

HashFunction adapter for MessageDigest instances.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	MessageDigestHashFunction.MessageDigestHasher	Hasher that updates a message digest.
private static class	MessageDigestHashFunction.SerializedForm

Field Summary

Fields

Modifier and Type	Field	Description
private int	bytes
private java.security.MessageDigest	prototype
private boolean	supportsClone
private java.lang.String	toString

Constructor Summary

Constructors

Constructor	Description
MessageDigestHashFunction(java.lang.String algorithmName, int bytes, java.lang.String toString)
MessageDigestHashFunction(java.lang.String algorithmName, java.lang.String toString)

Method Summary

Modifier and Type	Method	Description
int	bits()	Returns the number of bits (a multiple of 32) that each hash code produced by this hash function has.
private static java.security.MessageDigest	getMessageDigest(java.lang.String algorithmName)
Hasher	newHasher()	Begins a new hash code computation by returning an initialized, stateful Hasher instance that is ready to receive data.
private static boolean	supportsClone(java.security.MessageDigest digest)
java.lang.String	toString()
(package private) java.lang.Object	writeReplace()

Methods inherited from class com.google.common.hash.AbstractHashFunction

hashBytes, hashBytes, hashBytes, hashInt, hashLong, hashObject, hashString, hashUnencodedChars, newHasher

Methods inherited from class java.lang.Object

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

Field Detail

prototype

private final java.security.MessageDigest prototype

bytes

private final int bytes

supportsClone

private final boolean supportsClone

toString

private final java.lang.String toString

Constructor Detail

MessageDigestHashFunction

MessageDigestHashFunction(java.lang.String algorithmName,
                          java.lang.String toString)

MessageDigestHashFunction

MessageDigestHashFunction(java.lang.String algorithmName,
                          int bytes,
                          java.lang.String toString)

Method Detail

supportsClone

private static boolean supportsClone(java.security.MessageDigest digest)

bits

public int bits()

Description copied from interface: HashFunction

Returns the number of bits (a multiple of 32) that each hash code produced by this hash function has.

Specified by:

bits in interface HashFunction

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

getMessageDigest

private static java.security.MessageDigest getMessageDigest(java.lang.String algorithmName)

newHasher

public Hasher newHasher()

Description copied from interface: HashFunction

Begins a new hash code computation by returning an initialized, stateful Hasher instance that is ready to receive data. Example:

 HashFunction hf = Hashing.md5();
 HashCode hc = hf.newHasher()
     .putLong(id)
     .putBoolean(isActive)
     .hash();
 

Specified by:

newHasher in interface HashFunction

writeReplace

java.lang.Object writeReplace()