Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Průvodce řešením problémů stáhnout pdf (Strana 81)

4: Managing data

Notify the system when a SyncCollection changes

Task Steps

Use a collection listener to

notify the system when a

SyncCollection changes.

The system invokes CollectionEventSource.addCollectionListener() to create a

CollectionListener for each SyncCollection that the application makes available for wireless

backup.

1. Create a private vector object to store the collection of SyncCollection listeners for the application.

private Vector _listeners;

_listeners = new CloneableVector();

2. Implement the CollectionListener() method, making sure that the method adds a

CollectionListener to the vector object.

public void addCollectionListener(Object listener)

{

_listeners = ListenerUtilities.fastAddListener( _listeners, listener );

}

Remove a collection listener. When the system no longer requires a CollectionListener, it invokes removeCollectionListener.

> Implement the removeCollectionListener()method, using the

ListenerUtilities.removeListener() method to remove a CollectionListener from the

collection of

SyncCollection listeners for the application.

public void removeCollectionListener(Object listener)

{_listeners = ListenerUtilities.removeListener( _listeners, listener );

}

Notify the system when an

element is added to a

SyncCollection.

>Invoke CollectionListener.elementAdded():

for( int i=0; i<_listeners.size(); i++ )

{

CollectionListener cl = (CollectionListener)_listeners.elementAt( i );

cl.elementAdded( this, object );

}

return true;

}

Notify the system when an

element is removed from a

SyncCollection.

>Invoke CollectionListener.elementRemoved().

Notify the system when an

element in a SyncCollection

is replaced.

>Invoke CollectionListener.elementUpdated().

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