com.fasterxml.uuid.impl

Class NameBasedGenerator

java.lang.Object

com.fasterxml.uuid.UUIDGenerator

com.fasterxml.uuid.StringArgGenerator

com.fasterxml.uuid.impl.NameBasedGenerator

public class NameBasedGenerator
extends StringArgGenerator

Implementation of UUID generator that uses one of name-based generation methods (variants 3 (MD5) and 5 (SHA1)).

As all JUG provided implementations, this generator is fully thread-safe; access to digester is synchronized as necessary.

Since:

3.0

Field Summary

Fields

Modifier and Type	Field and Description
protected MessageDigest	_digester Message digesster to use for hash calculation
protected UUID	_namespace Namespace to use as prefix.
protected UUIDType	_type
static Charset	_utf8
static UUID	NAMESPACE_DNS Namespace used when name is a DNS name.
static UUID	NAMESPACE_OID Namespace used when name is an OID.
static UUID	NAMESPACE_URL Namespace used when name is a URL.
static UUID	NAMESPACE_X500 Namespace used when name is an X500 identifier

Constructor Summary

Constructors

Constructor and Description
NameBasedGenerator(UUID namespace, MessageDigest digester, UUIDType type)

Method Summary

Methods

Modifier and Type	Method and Description
UUID	generate(byte[] nameBytes) Method for generating name-based UUIDs using specified byte-serialization of name.
UUID	generate(String name) Method for generating name-based UUIDs using specified name (serialized to bytes using UTF-8 encoding)
UUID	getNamespace()
UUIDType	getType() Accessor for determining type of UUIDs (variant) that this generator instance will produce.

Methods inherited from class java.lang.Object

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

Field Detail

_utf8

public static final Charset _utf8

NAMESPACE_DNS

public static final UUID NAMESPACE_DNS

Namespace used when name is a DNS name.

NAMESPACE_URL

public static final UUID NAMESPACE_URL

Namespace used when name is a URL.

NAMESPACE_OID

public static final UUID NAMESPACE_OID

Namespace used when name is an OID.

NAMESPACE_X500

public static final UUID NAMESPACE_X500

Namespace used when name is an X500 identifier

_namespace

protected final UUID _namespace

Namespace to use as prefix.

_digester

protected final MessageDigest _digester

Message digesster to use for hash calculation

_type

protected final UUIDType _type

Constructor Detail

NameBasedGenerator

public NameBasedGenerator(UUID namespace,
                  MessageDigest digester,
                  UUIDType type)

Parameters:

namespace - of the namespace, as defined by the spec. UUID has 4 pre-defined "standard" name space strings that can be passed to UUID constructor (see example below). Note that this argument is optional; if no namespace is needed (for example when name includes namespace prefix), null may be passed.

digester - Hashing algorithm to use.

Method Detail

getType

public UUIDType getType()

Description copied from class: UUIDGenerator

Accessor for determining type of UUIDs (variant) that this generator instance will produce.

Specified by:

getType in class UUIDGenerator

getNamespace

public UUID getNamespace()

generate

public UUID generate(String name)

Description copied from class: StringArgGenerator

Method for generating name-based UUIDs using specified name (serialized to bytes using UTF-8 encoding)

Specified by:

generate in class StringArgGenerator

generate

public UUID generate(byte[] nameBytes)

Description copied from class: StringArgGenerator

Method for generating name-based UUIDs using specified byte-serialization of name.

Specified by:

generate in class StringArgGenerator