Troubleshooting guide

4: Managing data

import java.io.*;

import java.util.*;

import net.rim.device.api.collection.*;

import net.rim.device.api.i18n.*;

import net.rim.device.api.synchronization.*;

import net.rim.device.api.util.*;

import net.rim.device.api.system.*;

/**

* A collection enabled for OTA backup/restore. Basically a serially syncable collection

* with few added interfaces.

class OTABackupRestoreContactCollection implements SyncConverter, SyncCollection,

OTASyncCapable, CollectionEventSource

{

private static final long PERSISTENT_KEY = 0x266babf899b20b56L; //

com.rim.samples.device.otabackuprestoredemo.OTABackupRestoreContactCollection._persist

private static final long AR_KEY = 0xef780e08b3a7cf07L; //

com.rim.samples.device.otabackuprestoredemo.OTABackupRestoreContactCollection

private PersistentObject _persist; // the persistable object for the contacts

private Vector _contacts; // the actual contacts

private Vector _listeners; // listeners to generate events when contacts

are added

private SyncCollectionSchema _schema; // lets us know about the data we are backing

private static final int FIELDTAG_FIRST_NAME = 1;

private static final int FIELDTAG_LAST_NAME = 2;

private static final int FIELDTAG_EMAIL_ADDRESS = 3;

private static final int DEFAULT_RECORD_TYPE = 1; // the id for the default (and

the only) record type

private static final int[] KEY_FIELD_IDS = new int[] { // key fields - lets the server

know which fields uniquely define a record

FIELDTAG_FIRST_NAME,

FIELDTAG_LAST_NAME

};

private OTABackupRestoreContactCollection()

{

_persist = PersistentStore.getPersistentObject( PERSISTENT_KEY );

_contacts = (Vector)_persist.getContents();

if( _contacts == null )

{

_contacts = new Vector();

_persist.setContents( _contacts );

_persist.commit();

}

_listeners = new CloneableVector();

// set up the schema for the collection

_schema = new SyncCollectionSchema();