/*
 * HighScoreComparator.java
 *
 * Created on 2006年6月8日, 下午4:03
 *
 * To change this template, choose Tools | Options and locate the template under
 * the Source Creation and Management node. Right-click the template and choose
 * Open. You can then make changes to the template in the Source Editor.
 */
import javax.microedition.lcdui.*;
import java.io.*;
import java.util.*;
import javax.microedition.rms.*;
/**
 *
 * @author Administrator
 */
class HighScoreRms implements RecordComparator {
    public int compare(byte[] rec1, byte[] rec2){
        int p1=0;
        int p2=0;
        try{
            HighScoreComparator.deserialize(rec1);
            p1=HighScoreComparator.point;
            HighScoreComparator.deserialize(rec2);
            p2=HighScoreComparator.point;
        }catch(Exception e){}
        if (p1==p2){
            return RecordComparator.EQUIVALENT;
        } else if(p1>p2){
            return RecordComparator.PRECEDES;
        } else{
            return RecordComparator.FOLLOWS;
        }
    }
    
}
public class HighScoreComparator{
    
    /** Creates a new instance of HighScoreComparator */
    public HighScoreComparator() {
    }

    public static String playName="";
    public static int point=0;
    public static String[] plays=null;
    public static int[] points=null;
    public static byte[] data=null;
    
    public static byte[] serialize(String pName,int pt) throws IOException{
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        dos.writeUTF(pName);
        dos.writeInt(pt);
        baos.close();
        dos.close();
        return baos.toByteArray();
    }
    public static void deserialize(byte[] data1) throws IOException{
        ByteArrayInputStream bais = new ByteArrayInputStream(data1);
        DataInputStream dis = new DataInputStream(bais);
        playName=dis.readUTF();
        point=dis.readInt();
        bais.close();
        dis.close();
    }
    
    public static int getMaxPoint(){
        int r=0;
        int id=0;
        RecordStore rs1=null;
        try{
            rs1=RecordStore.openRecordStore("highscore",true);
        }catch(Exception e){
        }
        if (rs1!=null){
            RecordEnumeration re=null;
            try{
                re=rs1.enumerateRecords(null,new HighScoreRms(),false);
                if(re.hasNextElement()){
                    id=re.nextRecordId();
                    data=rs1.getRecord(id);
                    deserialize(data);
                }
            }catch(Exception e){
            }
            if(re!=null){
                re.destroy();
            }
            r=point;
            re=null;
            try{
                rs1.closeRecordStore();
            }catch(Exception e){
            }
            rs1=null;
        }
        return r;
    }
    
    //返回值-1代表沒有此記錄或記數(shù)個(gè)數(shù)少于5
    public static int getMinRecId(){
        int r=-1;
        RecordStore rs1=null;
        try{
            rs1=RecordStore.openRecordStore("highscore",true);
        }catch(Exception e){}
        
        RecordEnumeration re=null;
        if (rs1!=null){
            try{
                r=rs1.getNumRecords();//得到刻錄的總個(gè)數(shù)
            }catch(Exception e){}
            
            if (r<5){
                r=-1;
            }else{
                try{
                    re=rs1.enumerateRecords(null,new HighScoreRms(),false);
                    while(re.hasNextElement()){
                        r=re.nextRecordId();
                    }
                }catch(Exception e){}
                
                if(re!=null){
                    re.destroy();
                }
                re=null;
            }
            try{
                rs1.closeRecordStore();
            }catch(Exception e){}
            rs1=null;
        }
        return r;
    }
    /**
     *保存記錄
     *@parameter name:玩家名子
     *pot:玩家的得分
     */
    public static void saveRec(String name,int pot){
        try{
            data=HighScoreComparator.serialize(name,pot);
        }catch(Exception e){}
        
        int min=getMinRecId();
        RecordStore rs1=null;
        try{
            rs1=RecordStore.openRecordStore("highscore",true);
        } catch(Exception e){}
        
        if (rs1!=null){
            if (min==-1){
                try{
                    rs1.addRecord(data,0,data.length);
                }catch(Exception e){}
                
            }else{
                try{
                    rs1.setRecord(min,data,0,data.length);
                }catch(Exception e){}
            }
            try{
                rs1.closeRecordStore();
            }catch(Exception e){}
            rs1=null;
        }
    }
    
    //返回值代表已經(jīng)存儲(chǔ)的記錄個(gè)數(shù)
    public static int setHighScoreList(){
        int r=0;
        RecordStore rs1=null;
        try{
            rs1=RecordStore.openRecordStore("highscore",true);
            r=rs1.getNumRecords();
        }catch(Exception e){}
        
        if (r>0){
            plays=new String[r];
            points=new int[r];
            try{
                RecordEnumeration re=rs1.enumerateRecords(null,new HighScoreRms(),false);
                int i=0;
                while(re.hasNextElement()){
                    data=re.nextRecord();
                    deserialize(data);
                    plays[i]=playName;
                    points[i]=point;
                    i++;
                }
                if(re!=null){
                    re.destroy();
                }
            }catch(Exception e){}
            
        }
        try{
            rs1.closeRecordStore();
        }catch(Exception e){}
        rs1=null;
        return r;
    }
    
}