createaddressbook.java

7个J2ME例子

/*
 * Copyright (c) 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
 */

package examples.addressbook;
import java.lang.*;
import java.io.*;
import java.util.*;
import javax.microedition.rms.*;

/**
 * Static helper class that creates a record
 * store from data in an array.
 */
class CreateAddressBook {

    // Don't allow this class to be instantiated
    private CreateAddressBook() {}
    /**
     * Helper method that creates a record
     * store from data in an array.
     * Returns:
     *  true      if RMS store was created
     *  false     otherwise
     *  name      the name of the record store to create
     *  seedData  an array w/ data to seed record store
     */
    static boolean createRecordStore(String name,
                                     String[] seedData) {
        RecordStore recordStore;
        boolean ret = false;
        // Delete any previous record store with same name.
        // Silently ignore failure.
        try {
            RecordStore.deleteRecordStore(name);
        } catch (Exception rse) {}

        // Create new RMS store. If we fail, return false.
        try {
            recordStore = RecordStore.openRecordStore(name, true);
        } catch (RecordStoreException rse) {
            return ret;
        }

        ret = true; // assume success

        // Now, populate the record store with the seed data
        for (int i = 0; i < seedData.length; i += 3) {
            byte[] record = SimpleRecord.createRecord(seedData[i],
                                                      seedData[i+1],
                                                      seedData[i+2]);

            try {
                recordStore.addRecord(record, 0, record.length);
            } catch (RecordStoreException rse) {
                ret = false;
                break;
            }
        }

        // Get here when adds are complete, or an error occured.
        // In any case, close the record store. We shouldn't
        // have a failure, so silently ignore any exceptions.
        try {
            recordStore.closeRecordStore();
        } catch (RecordStoreException rsne) {}

        return ret;
    }
}