ojb.broker.util.sequence
Class SequenceManagerDefaultImpl

java.lang.Object
  |
  +--ojb.broker.util.sequence.SequenceManagerDefaultImpl

All Implemented Interfaces:

SequenceManager

Direct Known Subclasses:

SequenceManagerHighLowImpl

public class SequenceManagerDefaultImpl

extends java.lang.Object

implements SequenceManager

A simple SequenceManager. This class is responsible for creating new unique ID's for primary columns containing integer values. The SequenceManager is aware of extends, that is: if you ask for an uid for an Interface with several implementor classes, or a baseclass with several subclasses the returned uid will unique accross all tables representing objects of the extent in question.

Field Summary

protected PersistenceBrokerImpl

broker reference to the PersistenceBroker

Constructor Summary

SequenceManagerDefaultImpl(PersistenceBrokerImpl broker)
Public constructor

Method Summary

protected int	getMaxForExtent(java.lang.Class clazz, java.lang.String fieldName) lookup all tables in extent clazz to find the current maximum value for fieldName
int	getUniqueId(java.lang.Class clazz, java.lang.String fieldName) returns a unique int for class clazz and field fieldName.
long	getUniqueLong(java.lang.Class clazz, java.lang.String fieldName) returns a unique long value for class clazz and field fieldName.
java.lang.Object	getUniqueObject(java.lang.Class clazz, java.lang.String fieldName) returns a unique Object for class clazz and field fieldName.
java.lang.String	getUniqueString(java.lang.Class clazz, java.lang.String fieldName) returns a unique String for class clazz and field fieldName.

Methods inherited from class java.lang.Object

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

Field Detail

broker

protected PersistenceBrokerImpl broker

reference to the PersistenceBroker

Constructor Detail

SequenceManagerDefaultImpl

public SequenceManagerDefaultImpl(PersistenceBrokerImpl broker)

Public constructor

Method Detail

getUniqueId

public int getUniqueId(java.lang.Class clazz,
                       java.lang.String fieldName)

returns a unique int for class clazz and field fieldName. the returned uid is unique accross all tables in the extent of clazz.

Specified by:

getUniqueId in interface SequenceManager

getMaxForExtent

protected int getMaxForExtent(java.lang.Class clazz,
                              java.lang.String fieldName)
                       throws PersistenceBrokerException

lookup all tables in extent clazz to find the current maximum value for fieldName

PersistenceBrokerException

getUniqueString

public java.lang.String getUniqueString(java.lang.Class clazz,
                                        java.lang.String fieldName)

returns a unique String for class clazz and field fieldName. the returned uid is unique accross all tables in the extent of clazz.

Specified by:

getUniqueString in interface SequenceManager

getUniqueLong

public long getUniqueLong(java.lang.Class clazz,
                          java.lang.String fieldName)

returns a unique long value for class clazz and field fieldName. the returned number is unique accross all tables in the extent of clazz.

Specified by:

getUniqueLong in interface SequenceManager

getUniqueObject

public java.lang.Object getUniqueObject(java.lang.Class clazz,
                                        java.lang.String fieldName)

returns a unique Object for class clazz and field fieldName. the returned Object is unique accross all tables in the extent of clazz.

Specified by:

getUniqueObject in interface SequenceManager