Package com.foxinmy.weixin4j.util

Class ObjectId

java.lang.Object

com.foxinmy.weixin4j.util.ObjectId

All Implemented Interfaces:

Serializable, Comparable<ObjectId>

public class ObjectId
extends Object
implements Comparable<ObjectId>, Serializable

A globally unique identifier for objects.

Consists of 12 bytes, divided as follows:

ObjectID layout

0	1	2	3	4	5	6	7	8	9	10	11
time				machine			pid		inc

Instances of this class are immutable.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
ObjectId()	Create a new object id.
ObjectId(byte[] b)	Constructs an ObjectId given its 12-byte binary representation.

Method Summary

Modifier and Type	Method	Description
int	compareTo(ObjectId id)
boolean	equals(Object o)
static ObjectId	get()	Gets a new object id.
static int	getCurrentCounter()	Gets the current value of the auto-incrementing counter.
Date	getDate()	Gets the timestamp as a Date instance.
int	getTimestamp()	Gets the timestamp (number of seconds since the Unix epoch).
int	hashCode()
static boolean	isValid(String s)	Checks if a string could be an ObjectId.
byte[]	toByteArray()	Convert to a byte array.
String	toHexString()	Converts this instance into a 24-byte hexadecimal string representation.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ObjectId

public ObjectId(byte[] b)

Constructs an ObjectId given its 12-byte binary representation.

Parameters:

b - a byte array of length 12

ObjectId

public ObjectId()

Create a new object id.

Method Detail

get

public static ObjectId get()

Gets a new object id.

Returns:

the new id

isValid

public static boolean isValid(String s)

Checks if a string could be an ObjectId.

Parameters:

s - a potential ObjectId as a String.

Returns:

whether the string could be an object id

Throws:

IllegalArgumentException - if hexString is null

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

toHexString

public String toHexString()

Converts this instance into a 24-byte hexadecimal string representation.

Returns:

a string representation of the ObjectId in hexadecimal format

toByteArray

public byte[] toByteArray()

Convert to a byte array. Note that the numbers are stored in big-endian order.

Returns:

the byte array

toString

public String toString()

Overrides:

toString in class Object

compareTo

public int compareTo(ObjectId id)

Specified by:

compareTo in interface Comparable<ObjectId>

getTimestamp

public int getTimestamp()

Gets the timestamp (number of seconds since the Unix epoch).

Returns:

the timestamp

getDate

public Date getDate()

Gets the timestamp as a Date instance.

Returns:

the Date

getCurrentCounter

public static int getCurrentCounter()

Gets the current value of the auto-incrementing counter.

Returns:

the current counter value.