Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Instrukcja Naprawy Pobierz pdf (Strona 80)

BlackBerry Java Development Environment Development Guide

Access a SyncCollection

Task Steps

Retrieve an instance of the

SyncCollection from the

RunTimeStore.

> To make sure that the application works with only one version of the SyncCollection, implement a

static method that returns an instance of the

SyncCollection.

static OTABackupRestoreContactCollection getInstance()

{

RuntimeStore rs = RuntimeStore.getRuntimeStore();

synchronized( rs )

{

OTABackupRestoreContactCollection collection =

(OTABackupRestoreContactCollection)rs.get( AR_KEY );

if( collection == null )

{

collection = new OTABackupRestoreContactCollection();

rs.put( AR_KEY, collection );

}

return collection;

}

Retrieve the SyncCollection

from the PersistentStore.

1. To provide the application with access to the newest SyncCollection data from the

PersistentStore, invoke the PersistentStore.getPersistentObject() method using the ID

of the

SyncCollection.

2. Store the returned data in a vector object.

private PersistentObject _persist; // The persistable object for the

contacts.

private Vector _contacts; // The actual contacts.

private static final long PERSISTENT_KEY = 0x266babf899b20b56L;

_persist = PersistentStore.getPersistentObject( PERSISTENT_KEY );

_contacts = (Vector)_persist.getContents();

3. Create a method to provide the application with the newest SyncCollection data before a wireless

data backup session begins.

public void beginTransaction()

{

_persist = PersistentStore.getPersistentObject(PERSISTENT_KEY);

_contacts = (Vector)_persist.getContents();

}

4. Create code to manage the case where the SyncCollection you retrieve from the PersistentStore

is empty.

if( _contacts == null )

{

_contacts = new Vector();

_persist.setContents( _contacts );

_persist.commit();

}

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 285 286

Komentarze do niniejszej Instrukcji

Brak uwag

Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE Instrukcja Naprawy Strona 80

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Oprogramowanie Blackberry JAVA DEVELOPMENT ENVIRONMENT - - CRYPTOGRAPHIC SMART CARD DRIVER - DEVELOPMENT GUIDE