operaterms.java~1~

手机上一个坦克游戏

package demo;

import javax.microedition.lcdui.*;
import javax.microedition.rms.*;
import java.io.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

public class OperateRMS {
    private String dbname;
    RecordStore rs;

    public OperateRMS(String name) {
        this.dbname = name;
    }

    public int recordNum() { //读取记录个数
        int n = 0;
        try {
            n = rs.getNumRecords();
        }
        catch (Exception e) {}
        return n;
    }

    public RecordStore openRSAnyway() {
        //打开rms
        rs = null; //名稱大於32 個字元就不接受
        if (dbname.length() > 32) {
            return null;
        }
        try {
            rs = RecordStore.openRecordStore(dbname, true);
            return rs;
        }
        catch (Exception e) {
            return null;
        }
    }

    public boolean deleteRS() { //删除rms
        if (dbname.length() > 32) {
            return false;
        }
        try {
            RecordStore.deleteRecordStore(dbname);
        }
        catch (Exception e) {
            return false;
        }
        return true;
    }

    public boolean closeRSAnyway() { //关闭rms
        rs = null; //名稱大於32 個字元就不接受
        if (dbname.length() > 32) {
            return false;
        }
        try {
            rs.closeRecordStore();
        }
        catch (Exception e) {}
        return true;
    }

    public void addMap(short[] mapInfo, int id, int map_wid, int map_hei, String map_name) {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(bos);
        byte[] tmp = null;
        try {
            //System.out.println("add map:");
            dos.writeInt(id); // map id
            dos.writeInt(map_wid); // map width
            dos.writeInt(map_hei); // map height
            dos.writeUTF(map_name);
            dos.writeInt(mapInfo.length); // write length
            //System.out.println("mapInfo.length" + mapInfo.length);
            for (int n = 0; n < mapInfo.length; n++) {
                dos.writeShort(mapInfo[n]);
            }
            //System.out.println("id: " + id + " wid: " + map_wid + " hei: " + map_hei + " name:" + map_name);
            tmp = bos.toByteArray();
            dos.close();
            bos.close();
            if (rs.getNumRecords() < 5) {
                //System.out.println("<5: " + rs.getNumRecords());
                rs.addRecord(tmp, 0, tmp.length);
                //System.out.println("add : " + rs.getNumRecords());
                if(rs.getNumRecords() != 1){
                    for (int i = recordNum(); i > 1; i--) {
                        byte[] temp = rs.getRecord(i - 1);
                        rs.setRecord(i, temp, 0, temp.length); //int\u00A0recordId, byte[]\u00A0newData, int\u00A0offset, int\u00A0numBytes
                    }
                    rs.setRecord(1, tmp, 0, tmp.length);
                }
            }else{
                if(rs.getNumRecords() == 5){
                    //System.out.println("= 5 " + rs.getNumRecords());
                    for (int i = recordNum(); i > 1; i--) {
                        byte[] temp = rs.getRecord(i - 1);
                        rs.setRecord(i, temp, 0, temp.length); //int\u00A0recordId, byte[]\u00A0newData, int\u00A0offset, int\u00A0numBytes
                    }
                    rs.setRecord(1, tmp, 0, tmp.length);
                    //System.out.println("after update: " + rs.getNumRecords());
                }
            }

        }
        catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    public int getMapIndex(int map_id){
        try {
            for (int i = 1; i <= rs.getNumRecords(); i++) {
                //BattleField.debug("record " + i + " id: " + getMapID(i));
                if(getMapID(i) == map_id){
                    return i;
                }
            }
        }
        catch (RecordStoreNotOpenException ex) {
            ex.printStackTrace();
        }
        return -1;
    }

    public short[] getMap(int index) {
        try {
            //System.out.println("get map:");
            byte tmp[] = rs.getRecord(index);
            ByteArrayInputStream bis = new ByteArrayInputStream(tmp);
            DataInputStream dis = new DataInputStream(bis);
            int i = dis.readInt();
            i = dis.readInt();
            i = dis.readInt();
            String temp = dis.readUTF();
            int length = dis.readInt();
            short[] mapInfo = new short[length];
            for (int m = 0; m < length; m++) {
                mapInfo[m] = dis.readShort();
            }
            return mapInfo;
        }
        catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }
    }

    public int getMapID(int index) {
        //System.out.println("get Map ID of " + index);
        try {
            byte tmp[] = rs.getRecord(index);
            ByteArrayInputStream bis = new ByteArrayInputStream(tmp);
            DataInputStream dis = new DataInputStream(bis);
            // id wid hei name length content
            int id = dis.readInt();
            //System.out.println("id = " + id);
            return id;
        }
        catch (Exception ex) {
            ex.printStackTrace();
            return -1;
        }
    }

    public int getMapWidth(int index){
        try {
            byte tmp[] = rs.getRecord(index);
            ByteArrayInputStream bis = new ByteArrayInputStream(tmp);
            DataInputStream dis = new DataInputStream(bis);
            // id wid hei name length content
            int wid = dis.readInt();
            wid = dis.readInt();
            return wid;
        }
        catch (Exception ex) {
            ex.printStackTrace();
            return -1;
        }
    }

    public int getMapHeight(int index){
        try {
            byte tmp[] = rs.getRecord(index);
            ByteArrayInputStream bis = new ByteArrayInputStream(tmp);
            DataInputStream dis = new DataInputStream(bis);
            // id wid hei name length content
            int hei = dis.readInt();
            hei = dis.readInt();
            hei = dis.readInt();
            return hei;

        }
        catch (Exception ex) {
            ex.printStackTrace();
            return -1;
        }
    }

    public String getMapName(int index){
        try {
            byte tmp[] = rs.getRecord(index);
            ByteArrayInputStream bis = new ByteArrayInputStream(tmp);
            DataInputStream dis = new DataInputStream(bis);
            // id wid hei name length content
            int id = dis.readInt();
            id = dis.readInt();
            id = dis.readInt();
            String name = dis.readUTF();
            return name;

        }
        catch (Exception ex) {
            ex.printStackTrace();
            return null;
        }

    }
    public String UIManagerIn(int index) {
         String result = "";
         try {
             //如果是从RMS中取得数据，并且RMS不为空
                 byte abyte0[] = rs.getRecord(index);
                 ByteArrayInputStream byteArrayInputStream = new
                     ByteArrayInputStream(abyte0);
                 DataInputStream dataInputStream = new DataInputStream(
                     byteArrayInputStream);
                 result = dataInputStream.readUTF();
                 dataInputStream.close();
         }
         catch (Exception e) {
             e.printStackTrace();
         }
         return result;
     }
     public void UIManagerOut(String data) {
         boolean isFound = false;
         try{
             int num = recordNum();
             for(int i = 0 ;i < num; i++){
                if(UIManagerIn(i+1).equals(data)){
                    isFound = true;
                    break;
                }
             }
             if(!isFound){
                 //System.out.println("add user to User's RMS");
                 ByteArrayOutputStream byteArrayOutputStream = new
                     ByteArrayOutputStream();
                 DataOutputStream dataOutputStream = new DataOutputStream(
                     byteArrayOutputStream);
                 dataOutputStream.writeUTF(data);
                 byte abyte1[] = byteArrayOutputStream.toByteArray();
                 rs.addRecord(abyte1, 0, abyte1.length);
                 dataOutputStream.close();
             }

         }
         catch(Exception e){
             e.printStackTrace();
         }

     }

}