serializedgamepreferenceprovider.java

来自「一个JAVA程序员的游戏」· Java 代码 · 共 73 行

/*
 * SerializedGamePreferenceProvider.java
 *
 * Created on 22. Februar 2007, 14:19
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */

package kanjitori.preferences;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

/**
 *
 * @author Pirx
 */
public class SerializedGamePreferenceProvider implements GamePreferenceProvider {
    
    private static final String DEFAULT_FILE_NAME = "preferences.ser";
    
    private static final SerializedGamePreferenceProvider INSTANCE 
            = new SerializedGamePreferenceProvider();
    
    /**
     * Creates a new instance of SerializedGamePreferenceProvider
     */
    private SerializedGamePreferenceProvider() {
    }

    public GamePreferences load(String fileName) {
        try {
            FileInputStream fis = new FileInputStream(fileName);
            ObjectInputStream ois = new ObjectInputStream(fis);
            GamePreferences prefs = (GamePreferences) ois.readObject();
            prefs.setFileName(fileName);
            return prefs;
        } catch (IOException ex) {
            ex.printStackTrace();
        }  catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        }     
        return null;
    }

    public void save(String fileName, GamePreferences prefs) {
        try {
            FileOutputStream fos = new FileOutputStream(fileName);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(prefs);
            oos.flush();
            oos.close();
            prefs.setFileName(fileName);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    public String getDefaultId() {
        return DEFAULT_FILE_NAME;
    }
    
    public static SerializedGamePreferenceProvider getProvider() {
        return INSTANCE;
    }
    
}