org.apache.commons.id.uuid.state
Class StateHelper

java.lang.Object
  org.apache.commons.id.uuid.state.StateHelper

All Implemented Interfaces:

Constants

public final class StateHelper
extends Object
implements Constants

StateHelper provides helper methods for the uuid state implementations.

Version:

$Id: StateHelper.java 480488 2006-11-29 08:57:26Z bayard $

Author:

Commons-Id team

Field Summary

static short	BYTES_IN_SHORT Number of bytes in a short.
static short	HOSTNAME_MAX_CHAR_LEN Number of postitions to shift when shifting by one byte.
static int	NODE_ID_BYTE_LENGTH Array length of node bytes.
static short	SHIFT_BY_BYTE Number of postitions to shift when shifting by one byte.
static String	UUID_CLOCK_IMPL_PROPERTY_KEY The key for the System.property containing the ClockImpl String.
static String	UUID_STATE_IMPL_PROPERTY_KEY The key for the System.property containing the StateImpl String.
protected static String	XML_DOC_END End of the XML document used to store state persistence in XML
protected static String	XML_DOC_START Start of the XML document used to store state persistence in XML
protected static String	XML_DOC_START_END End of document start
protected static String	XML_NODE_TAG_AFTER_CSEQ After clock sequence of XML node tag
protected static String	XML_NODE_TAG_AFTER_ID After id of XML node tag
protected static String	XML_NODE_TAG_END End of XML node tag
protected static String	XML_NODE_TAG_START Start of XML node tag

Fields inherited from interface org.apache.commons.id.uuid.Constants

CLOCK_SEQ_HI_AND_RESERVED_BYTE_8, FORMAT_POSITION1, FORMAT_POSITION2, FORMAT_POSITION3, FORMAT_POSITION4, MD5_ENCODING, SHA1_ENCODING, TIME_HI_AND_VERSION_BYTE_6, TIME_HI_BYTE_LEN, TIME_HI_START_POS, TIME_HI_TS_POS, TIME_LOW_BYTE_LEN, TIME_LOW_START_POS, TIME_LOW_TS_POS, TIME_MID_BYTE_LEN, TIME_MID_START_POS, TIME_MID_TS_POS, TOKEN_LENGTHS, TOKENS_IN_UUID, URN_PREFIX, UUID_BIT_LENGTH, UUID_BYTE_LENGTH, UUID_FORMATTED_LENGTH, UUID_UNFORMATTED_LENGTH, VARIANT_FUTURE, VARIANT_IETF_DRAFT, VARIANT_MS, VARIANT_NCS_COMPAT, VERSION_FIVE, VERSION_FOUR, VERSION_ONE, VERSION_THREE, VERSION_TWO, WRONG_VAR_VER_MSG

Method Summary

static byte[]	decodeMACAddress(String address) Utility method decodes a valid MAC address in the form of XX-XX-XX-XX-XX-XX where each XX represents a hexidecimal value.
static String	encodeMACAddress(byte[] address) Returns the node id / address byte array in it's hexidecimal string representation in the following format: XX-XX-XX-XX-XX-XX where each XX represents a hexidecimal value.
static Clock	getClockImpl() Returns the Clock implementation using commons discovery.
static State	getStateImpl() Returns the State implementation in use.
static short	newClockSequence() Generates a new security quality random clock sequence.
static byte[]	randomNodeIdentifier() Creates a Random node identifier as described in IEFT UUID URN specification.

Methods inherited from class java.lang.Object

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

Field Detail

UUID_CLOCK_IMPL_PROPERTY_KEY

public static final String UUID_CLOCK_IMPL_PROPERTY_KEY

The key for the System.property containing the ClockImpl String.

UUID_STATE_IMPL_PROPERTY_KEY

public static final String UUID_STATE_IMPL_PROPERTY_KEY

The key for the System.property containing the StateImpl String.

NODE_ID_BYTE_LENGTH

public static final int NODE_ID_BYTE_LENGTH

Array length of node bytes.

See Also:

Constant Field Values

BYTES_IN_SHORT

public static final short BYTES_IN_SHORT

Number of bytes in a short.

See Also:

Constant Field Values

SHIFT_BY_BYTE

public static final short SHIFT_BY_BYTE

Number of postitions to shift when shifting by one byte.

See Also:

Constant Field Values

HOSTNAME_MAX_CHAR_LEN

public static final short HOSTNAME_MAX_CHAR_LEN

Number of postitions to shift when shifting by one byte.

See Also:

Constant Field Values

XML_DOC_START

protected static final String XML_DOC_START

Start of the XML document used to store state persistence in XML

See Also:

Constant Field Values

XML_DOC_START_END

protected static final String XML_DOC_START_END

End of document start

See Also:

Constant Field Values

XML_NODE_TAG_START

protected static final String XML_NODE_TAG_START

Start of XML node tag

See Also:

Constant Field Values

XML_NODE_TAG_AFTER_ID

protected static final String XML_NODE_TAG_AFTER_ID

After id of XML node tag

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Constant Field Values

XML_NODE_TAG_AFTER_CSEQ

protected static final String XML_NODE_TAG_AFTER_CSEQ

After clock sequence of XML node tag

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Constant Field Values

XML_NODE_TAG_END

protected static final String XML_NODE_TAG_END

End of XML node tag

See Also:

Constant Field Values

XML_DOC_END

protected static final String XML_DOC_END

End of the XML document used to store state persistence in XML

See Also:

Constant Field Values

Method Detail

randomNodeIdentifier

public static byte[] randomNodeIdentifier()

Creates a Random node identifier as described in IEFT UUID URN specification.

Returns:

a random node idenfifier based on MD5 of system information.

newClockSequence

public static short newClockSequence()

Generates a new security quality random clock sequence.

Returns:

a new security quality random clock sequence.

getClockImpl

public static Clock getClockImpl()

Returns the Clock implementation using commons discovery.

Returns:

the Clock implementation using commons discovery.

getStateImpl

public static State getStateImpl()

Returns the State implementation in use.

Returns:

the State implementation in use.

decodeMACAddress

public static byte[] decodeMACAddress(String address)

Utility method decodes a valid MAC address in the form of XX-XX-XX-XX-XX-XX where each XX represents a hexidecimal value.

Returns null if the address can not be decoded.

Parameters:

address - the String hexidecimal dash separated MAC address.

Returns:

a byte array representing the the address. Null if not a valid address.

encodeMACAddress

public static String encodeMACAddress(byte[] address)
                               throws IOException

Returns the node id / address byte array in it's hexidecimal string representation in the following format: XX-XX-XX-XX-XX-XX where each XX represents a hexidecimal value.

Parameters:

address - the 6 byte node id / address.

Returns:

the node id /address byte array in as hexidecimal with dash separating each octet.

Throws:

IOException - an Input Output Exception.