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ojb.broker.util.sequence
Class SequenceManagerDefaultImpl  

java.lang.Object
  ojb.broker.util.sequence.SequenceManagerDefaultImpl

All Implemented Interfaces:

SequenceManager

Direct Known Subclasses:

SequenceManagerHighLowImpl

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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.

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Field Summary
private static SequenceManagerDefaultImpl	_instance           singleton instance of the SequenceManager
protected  ojb.broker.singlevm.PersistenceBrokerImpl	broker           reference to the PersistenceBroker

 

Constructor Summary

SequenceManagerDefaultImpl(ojb.broker.singlevm.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
private  int	getMaxIdForClass(ojb.broker.metadata.ClassDescriptor cld, java.lang.String fieldName)           lookup current maximum value for fieldName in table cld.getTableName()
private  int	getNextId(java.lang.Class clazz, java.lang.String 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 ojb.broker.singlevm.PersistenceBrokerImpl broker

reference to the PersistenceBroker

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_instance

private static SequenceManagerDefaultImpl _instance

singleton instance of the SequenceManager

Constructor Detail

SequenceManagerDefaultImpl

public SequenceManagerDefaultImpl(ojb.broker.singlevm.PersistenceBrokerImpl broker)

Public constructor

Method Detail

getMaxIdForClass

private int getMaxIdForClass(ojb.broker.metadata.ClassDescriptor cld,
                             java.lang.String fieldName)
                      throws ojb.broker.PersistenceBrokerException

lookup current maximum value for fieldName in table cld.getTableName()

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getNextId

private int getNextId(java.lang.Class clazz,
                      java.lang.String fieldName)
               throws ojb.broker.PersistenceBrokerException

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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

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getMaxForExtent

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

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

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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

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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

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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

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> ojb >> broker >> util >> [ sequence overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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