ojb.broker.util.sequence
Interface SequenceManager

All Known Implementing Classes:

SequenceManagerDefaultImpl

public interface SequenceManager

SequenceManagers are responsible for creating new unique ID's for primary columns containing integer or String values. There is a simple Default implementation SequenceManagerDefaultImpl that provides rudimentary unique numbering. SequenceManager Objects are obtained from a Factory SequenceManagerFactory. This Factory can be configured to provide instances of user defined implementors of this interface. SequenceManagers should be 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 should be unique accross all tables representing objects of the extent in question.

Method Summary

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.

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.

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.

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.

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.