package com.briup.impl.backup;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Properties;
import com.briup.Backup;
import com.briup.exception.BackupException;

/**
 * @author renqs
 * @company Briup Technology Inc,.(Shanghai)
 * @date JUL 2, 2008 2:40:38 AM
 */
public class BackupImpl implements Backup {

	private String dataBackFile = "src/com/briup/resource/dataBakFile";

	/**
	 * 創建一個對象,讀取備份文件所在路徑
	 */
	public BackupImpl(Properties props) {
		String pDataBackFile = null;
		pDataBackFile = props.getProperty("bak_file_path");
		if (pDataBackFile != null)
			dataBackFile = pDataBackFile;
	}

	/**
	 * 清空備份文件中的內容,直接new一個新ArrayList放到備份文件中
	 */
	synchronized public void clear() throws BackupException {
		Collection c = new ArrayList();
		File f = new File(dataBackFile);
		ObjectOutputStream oos = null;
		try {
			oos = new ObjectOutputStream(new FileOutputStream(f));
			oos.writeObject(c);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (oos != null) {
				try {
					oos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}

	/**
	 * 讀取備份文件中的內容,并將其放入到結合中
	 * 
	 * @return Collection 存放BIRD對象的集合
	 */
	synchronized public Collection load() throws BackupException {
		File f = new File(dataBackFile);
		ObjectInputStream ois = null;
		Collection c = new ArrayList();
		
		return c;
	}

	/**
	 * 保存備份文件,先將已有的內容load進來,把要備份的內容與其合并后再保存到文件中
	 */
	synchronized public void store(Collection c) throws BackupException {
		
	}
}