dh
Class ObjectDataManager

java.lang.Object
  |
  +--dh.ObjectDataManager

All Implemented Interfaces:

DataManager

Direct Known Subclasses:

AppDataManager, ColorDataManager, FontAssozDataManager, FontDataManager, FontSymbol_PolylineDataManager, FontSymbol_SurfaceDataManager, FontSymbolDataManager, PointDataManager, PolylineDataManager, SurfaceDataManager, SymbolSignDataManager

public abstract class ObjectDataManager

extends java.lang.Object

implements DataManager

Superclass for every DataManager Class. Every Persistent Class in the Problem Domain has its own DataManager Classes (one for every Format) with the following Methods to overwrite: getCurrentOid() hasNextToLoad() createNextObject() saveObject()

Field Summary

protected boolean

isLoading Indicates if the object is currently saving or loading

Constructor Summary

ObjectDataManager(boolean a_isLoading)

Method Summary

abstract java.lang.Object	createNextObject() Should return the next Object
java.lang.String	getCurrentOid() Standard implementation.
java.lang.Object	getSource()
boolean	hasNext() Is there anymore Object to load
abstract boolean	hasNextToLoad()
boolean	isIsLoading()
java.lang.Object	next() Gets the next object from the datasource.
void	saveNext(java.lang.Object aObject, java.lang.String aOid) Saves the Object given as first Parameter in the datasource.
abstract void	saveObject(java.lang.Object aObject, java.lang.String aOid) Must save the given Object in the datasource
abstract void	saveToFile()
void	setIsLoading(boolean isLoading)

Methods inherited from class java.lang.Object

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

Field Detail

isLoading

protected boolean isLoading

Indicates if the object is currently saving or loading

Constructor Detail

ObjectDataManager

public ObjectDataManager(boolean a_isLoading)

Method Detail

isIsLoading

public boolean isIsLoading()

Specified by:

isIsLoading in interface DataManager

setIsLoading

public void setIsLoading(boolean isLoading)

Specified by:

setIsLoading in interface DataManager

hasNext

public boolean hasNext()

Is there anymore Object to load

Specified by:

hasNext in interface DataManager

next

public java.lang.Object next()
                      throws LoadException,
                             java.lang.Exception

Gets the next object from the datasource. Only calls the abstract class createNextObject() and catches all the Exceptipons that can occur.

Specified by:

next in interface DataManager

createNextObject

public abstract java.lang.Object createNextObject()
                                           throws LoadException,
                                                  java.lang.Exception

Should return the next Object

hasNextToLoad

public abstract boolean hasNextToLoad()

saveObject

public abstract void saveObject(java.lang.Object aObject,
                                java.lang.String aOid)

Must save the given Object in the datasource

Parameters:

the - Object to be saved

the - Object identifier of the Object if one is available, else null

saveToFile

public abstract void saveToFile()
                         throws java.io.IOException

Specified by:

saveToFile in interface DataManager

getSource

public java.lang.Object getSource()

Specified by:

getSource in interface DataManager

getCurrentOid

public java.lang.String getCurrentOid()

Standard implementation. If you want to return a Oid overwrite it in Subclass

Specified by:

getCurrentOid in interface DataManager

saveNext

public void saveNext(java.lang.Object aObject,
                     java.lang.String aOid)

Saves the Object given as first Parameter in the datasource. Only calls the abstract Method saveObject().

Specified by:

saveNext in interface DataManager