lprecordstore.java

J2ME手机游戏开发技术详解随书光盘

package exframework;

/**
 * <p>Title: ExFramework</p>
 *
 * <p>Description: lizhenpeng</p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: LP&P</p>
 *
 * @author lipeng
 * @version 1.0
 */

import javax.microedition.rms.*;

public class LPRecordStore
{
  public RecordStore rs;
  private String rsName;
  public LPRecordStore(String recordName)
  {
    rsName=recordName;
    try
    {
      rs=RecordStore.openRecordStore(rsName,true);
    }
    catch(Exception e)
    {
      System.out.println(e.toString());
    }
  }

  public void close()
  {
    try
    {
      rs.closeRecordStore();
    }
    catch(Exception e)
    {
      System.out.println(e.toString());
    }
  }
  public boolean empty()
  {
    try
    {
      if(rs.getNumRecords()>0)
      {
        return false;
      }
      else
      {
        return true;
      }
    }
    catch(Exception e)
    {
      System.out.println(e.toString());
    }
    return true;
  }

  public void setRecord(byte[] buffer)
  {
    try
    {
      if(empty())
      {
        rs.addRecord(buffer,0,buffer.length);
      }
      else
      {
        rs.setRecord(1,buffer,0,buffer.length);
      }
    }
    catch(Exception e)
    {
      System.out.println(e.toString());
    }
  }
  public byte[] getRecord()
  {
    byte buffer[];
    try
    {
      buffer=rs.getRecord(1);
      return buffer;
    }
    catch(Exception e)
    {
      System.out.println(e.toString());
    }
    return null;
  }

  public void deleteRecord()
  {
    try
    {
      rs.deleteRecordStore(rsName);
    }
    catch(Exception e)
    {
      System.out.println(e.toString());
    }
  }
}