com.pow2.dao
Class IdGenerator

java.lang.Object
  com.pow2.dao.AbstractDAO
      com.pow2.dao.IdGenerator

public class IdGenerator

extends AbstractDAO

IdGenerator class.
Use the HIGH/LOW approach to generate an uinque Id.
This method uses the app_identifier database table

field name	field type	is key ?
id	integer not null	y
high	integer	n

Initialize the unique table record with this SQL statement:
INSERT INTO "app_identifier" VALUES (0,1);

Author:

Luca Fossato

Field Summary

static int

LOW_MAXVALUE low max value

Fields inherited from class com.pow2.dao.AbstractDAO

cat

Constructor Summary

protected

IdGenerator() Protected default constructor.

Method Summary

long	getHigh() Gets the high attribute of the IdGenerator object
long	getId() Get a new unique identifier number.
int	getLow() Gets the low attribute of the IdGenerator object
static IdGenerator	instance() Get the instance of the IdGenerator class.
void	setHigh(long high) Sets the high attribute of the IdGenerator object
void	setLow(int low) Sets the low attribute of the IdGenerator object

Methods inherited from class com.pow2.dao.AbstractDAO

assertion, closeResources, closeResources, closeResources, count, count, delete, delete, encode, getConnection, getConnection, getNewKey, isDebugEnabled, populate, setLike, setLike

Methods inherited from class java.lang.Object

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

Field Detail

LOW_MAXVALUE

public static final int LOW_MAXVALUE

low max value

See Also:

Constant Field Values

Constructor Detail

IdGenerator

protected IdGenerator()

Protected default constructor.
Initialize the high and low values.

Method Detail

instance

public static IdGenerator instance()

Get the instance of the IdGenerator class.

Returns:

the instance of the IdGenerator class

setLow

public void setLow(int low)

Sets the low attribute of the IdGenerator object

Parameters:

low - The new low value

getLow

public int getLow()

Gets the low attribute of the IdGenerator object

Returns:

The low value

setHigh

public void setHigh(long high)

Sets the high attribute of the IdGenerator object

Parameters:

high - The new high value

getHigh

public long getHigh()

Gets the high attribute of the IdGenerator object

Returns:

The high value

getId

public long getId()
           throws Exception

Get a new unique identifier number.

Returns:

a new unique identifier number

Throws:

Exception - Description of the Exception