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package bcexchanger;

import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStore;

/**
 * 
 * This class abstracts an RMS system for storing the uid of the
 * contact entry from the address book, selected by user as own entry.
 * 
 * @version 1.0 29.09.2005
 */
public class Storage {

  /**
   * Gets the stored uid
   * 
   * @return string containing uid of the the contact entry from the
   *         address book, selected by user as own entry or null if no
   *         contact is previously selected
   * @exception Exception -
   *              in case of errors occur
   */
  static public String getBCUID() throws Exception {
    String uid = null;
    RecordStore db = RecordStore.openRecordStore("uid", true);

    RecordEnumeration e = db.enumerateRecords(null, null, false);

    if (!e.hasNextElement()) {
      uid = null;
    } else {
      byte[] record = e.nextRecord();
      if (record == null) {
        uid = null;
      } else {
        uid = new String(record);
      }
    }
    db.closeRecordStore();

    return uid;
  }

  /**
   * Stores the uid
   * 
   * @param uid -
   *          string containing uid of the the contact entry from the
   *          address book, selected by user as own entry
   * @exception Exception -
   *              in case of errors occur
   */
  static public void setBCUID(String uid) throws Exception {
    RecordStore db = RecordStore.openRecordStore("uid", true);

    // delete all records
    if (db.getNumRecords() != 0) {
      db.closeRecordStore();
      RecordStore.deleteRecordStore("uid");
      db = RecordStore.openRecordStore("uid", true);
    }

    byte[] record = uid.getBytes();
    db.addRecord(record, 0, record.length);

    db.closeRecordStore();
  }

}