net.wotonomy.datastore
Interface DataView

All Superinterfaces:

java.util.Collection, java.lang.Iterable, java.util.List

All Known Implementing Classes:

DefaultDataView

public interface DataView
extends java.util.List

Method Summary

void	addObserver(java.util.Observer o) Called to add the specified observer to the list of observers that should receive notifications when the view if modified.
boolean	commit() This method is called commit all changes to the DataView to its data store.
void	deleteObserver(java.util.Observer o) Called to remove the specified observer from the list of observers that should receive notifications when the view if modified.
void	deleteObservers() Called to clear the list of observers that should receive notifications when the view if modified.
DataKey	getKeyForObject(java.lang.Object anObject) Returns the key for the specified object.
java.lang.Object	getObjectForKey(DataKey aKey) Returns the object for the specified key.
void	update(java.lang.Object o) This method is called to notify the DataView that one of its objects has been modified and should be updated when the view is committed.

Methods inherited from interface java.util.List

add, add, addAll, addAll, clear, contains, containsAll, equals, get, hashCode, indexOf, isEmpty, iterator, lastIndexOf, listIterator, listIterator, remove, remove, removeAll, retainAll, set, size, subList, toArray, toArray

Method Detail

update

void update(java.lang.Object o)

This method is called to notify the DataView that one of its objects has been modified and should be updated when the view is committed.

commit

boolean commit()

This method is called commit all changes to the DataView to its data store. The list elements may be refreshed from the datastore, although the list itself should remain unchanged.

Returns:

True if the commit was successful, otherwise false.

addObserver

void addObserver(java.util.Observer o)

Called to add the specified observer to the list of observers that should receive notifications when the view if modified. DataViews notify when objects are added, updated, or deleted, passing the affected object as the parameter to the Observer's notify method.

Parameters:

o - The observer to add.

deleteObserver

void deleteObserver(java.util.Observer o)

Called to remove the specified observer from the list of observers that should receive notifications when the view if modified.

Parameters:

o - The observer to delete.

deleteObservers

void deleteObservers()

Called to clear the list of observers that should receive notifications when the view if modified.

getKeyForObject

DataKey getKeyForObject(java.lang.Object anObject)

Returns the key for the specified object. If the object is not in the view, returns null.

getObjectForKey

java.lang.Object getObjectForKey(DataKey aKey)

Returns the object for the specified key. If the key is not in the view, returns null.