save.java

横屏移动地图移动和人物移动横屏幕的移动初级作品

///Save.java   save record such as high score,game level

package Speeds;

import javax.microedition.rms.*;
import java.io.DataOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ByteArrayInputStream;
import java.io.DataInputStream;
import java.io.EOFException;

public class Save 
{
	
	protected RecordStore recordStore=null;
	protected RecordEnumeration re=null;
	
	public Save() {
		try
		{
			recordStore=RecordStore.openRecordStore("save",true);
			re=recordStore.enumerateRecords(null,null,true);
		}
		catch (RecordStoreException rse) {
			System.out.println(rse);
			rse.printStackTrace();
		}
		
	}


	public int getId(String vName) {
		int ret=0;
		try {
			re.reset();
			while(re.hasNextElement()) {
				int id = re.nextRecordId();
				ByteArrayInputStream bais = new ByteArrayInputStream(recordStore.getRecord(id));
				DataInputStream inputStream = new DataInputStream(bais);
				try {
					int value = inputStream.readInt();
					String var = inputStream.readUTF();
					if(var.equals(vName)) {
						ret=id;
						break;
					}
				}
				catch (EOFException eofe) {
					System.out.println(eofe);
					eofe.printStackTrace();
				}
			}
		}
		catch (RecordStoreException rse) {
			System.out.println(rse);
			rse.printStackTrace();
		}
		catch (IOException ioe) {
			System.out.println(ioe);
			ioe.printStackTrace();
		}

		return ret;
	}
		

	public boolean checkSave() {
		boolean ifSave=false;
		int count=0;
		try {
			re.reset();
			while(re.hasNextElement()) {
				int id = re.nextRecordId();
				count++;
			}
		}
		catch (RecordStoreException rse) {
			System.out.println(rse);
			rse.printStackTrace();
		}
		if(count>0) {
			//System.out.println("found record:"+count);
			ifSave=true;
		}
		return ifSave;
	}
	

	public boolean updateRec(int value,String vName) {
		int ret=0;
		/////////////////get record id
		try {
			//int num=re.numRecords();
			//System.out.println("total record:"+num);
			re.reset();
			while(re.hasNextElement()) {
				int id = re.nextRecordId();
				//System.out.println("come here");
				ByteArrayInputStream bais = new ByteArrayInputStream(recordStore.getRecord(id));
				DataInputStream inputStream = new DataInputStream(bais);
				try {
					int tmp=inputStream.readInt();
					String var = inputStream.readUTF();
					//System.out.println("get var:"+var);
					if(var.equals(vName)) {
						ret=id;
						//System.out.println("get id:"+ret);
						break;
					} else {
						ret=1;
					}
				}
				catch (EOFException eofe) {
					System.out.println(eofe);
					eofe.printStackTrace();
				}
			}
		}
		catch (RecordStoreException rse) {
			System.out.println(rse);
			rse.printStackTrace();
		}
		catch (IOException ioe) {
			System.out.println(ioe);
			ioe.printStackTrace();
		}
		//////////////////////////update record
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		DataOutputStream outputStream = new DataOutputStream(baos);
		try {
			outputStream.writeInt(value);
			outputStream.writeUTF(vName);
		}
		catch (IOException ioe) {
			System.out.println(ioe);
			ioe.printStackTrace();
		}

		// Extract the byte array
		byte[] b = baos.toByteArray();
		// Add it to the record store
		try {
			recordStore.setRecord(ret,b, 0, b.length);
		}
		catch (RecordStoreException rse) {
			System.out.println(rse);
			rse.printStackTrace();
			return false;
		}

		return true;


	}


	public boolean saveProcess(int value,String varName) {

		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		DataOutputStream outputStream = new DataOutputStream(baos);
		try {
			outputStream.writeInt(value);
			outputStream.writeUTF(varName);
		}
		catch (IOException ioe) {
			System.out.println(ioe);
			ioe.printStackTrace();
		}

		byte[] b = baos.toByteArray();
		try {
			recordStore.addRecord(b, 0, b.length);
		}
		catch (RecordStoreException rse) {
			System.out.println(rse);
			rse.printStackTrace();
			return false;
		}
		return true;
	}

	public int readProcess(String varName) {
		int ret=0;
		int value=0;
		String var=null;

		try {
			re.reset();
			while(re.hasNextElement()) {
				int id = re.nextRecordId();
				ByteArrayInputStream bais = new ByteArrayInputStream(recordStore.getRecord(id));
				DataInputStream inputStream = new DataInputStream(bais);
				try {
					value = inputStream.readInt();
					var = inputStream.readUTF();
					if(var.equals(varName)) {
						ret=value;
						//System.out.println("read var:"+varName+":"+ret);
						break;
					}
				}
				catch (EOFException eofe) {
					System.out.println(eofe);
					eofe.printStackTrace();
				}
			}
		}
		catch (RecordStoreException rse) {
			System.out.println(rse);
			rse.printStackTrace();
		}
		catch (IOException ioe) {
			System.out.println(ioe);
			ioe.printStackTrace();
		}
		return ret;
	}
}