- Package:
- com.apple.client.eocontrol
- com.apple.yellow.eocontrol
The EOEditingContext.MessageHandler interface declares methods used for error reporting and determining fetch limits. See the EOEditingContext, EODatabaseContext (EOAccess), and EODisplayGroup (EOInterface) class specifications for more information.
Message handlers are primarily used to implement exception handling in the interface layer's EODisplayGroup, and wouldn't ordinarily be used in a command line tool or WebObjects application.
Message handlers are not required to provide implementations
for all of the methods in the interface. When you write a handler,
you don't have to use the implements keyword
to specify that the object implements the EOEditingContext.MessageHandler interface.
Instead, simply use the EOEditingContext method setMessageHandler method
to assign your object as the EOEditingContext's handler and then
declare and implement any subset of the methods declared in the EOEditingContext.MessageHandler interface.
An EOEditingContext can determine if the handler doesn't implement
a method and only attempts to invoke the methods the handler actually implements.
public abstract void editingContextPresentErrorMessage(
EOEditingContext anEditingContext,
String message)
Invoked by anEditingContext, this method should present message to the user in whatever way is appropriate (whether by opening an attention panel or printing the message in a terminal window, for example). This message is sent only if the method is implemented.
public abstract boolean editingContextShouldContinueFetching(
EOEditingContext anEditingContext,
int count,
int limit,
EOObjectStore objectStore)