gstextfile.java

一个日本流行的,功能较全的开源Web办公管理(Groupware)系统。

package jp.co.sjts.gsession.tools;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;

/**
 * <p>嫟捠僥僉僗僩僼傽僀儖梡婎杮僋儔僗
 *
 * @author   Satoru K   &lt;[e-mail]&gt;
 */
abstract public class GSTextFile{
    
    /** 暥帤僐乕僪 */
	private String enc = "EUCJIS";

    /** 僼傽僀儖僆僽僕僃僋僩傪庢摼偟傑偡丅 */
	abstract protected File GetFile();
    
    /** 僼傽僀儖撉傒崬傒 */
	abstract protected void Read(BufferedReader bf) throws GSException;
    
    /** 僼傽僀儖弌椡 */
	abstract protected void Write(PrintWriter pw) throws GSException;

    /**
     * 儘僢僋
     */
	private File GetLockFile(){
		String buf = GetFile().getPath()+".Lock";
		return new File(buf);
	}

    /**
     *
     */
	public void setEncode(String enc){
		this.enc = enc;
	}

    /**
     *
     */
	public void Lock() throws GSException{
		while(GetLockFile().exists()){
			try	{
				Thread.sleep(100);
			}catch(InterruptedException e){
			}
		}

		GetLockFile().mkdir();
	}

    /**
     *
     */
	public void Unlock() throws GSException{
		GetLockFile().delete();
	}

    /**
     *
     */
	public final synchronized void Load() throws GSException{
		try {
			InputStreamReader isr = new InputStreamReader(new FileInputStream(GetFile()),enc);
			BufferedReader bf = new BufferedReader(isr);

			Read(bf);

			bf.close();
		} catch(GSException e) {
			throw new GSException("僼傽僀儖撉崬傒僄儔乕",e);
		} catch(FileNotFoundException e) {
			throw new GSException("僼傽僀儖偑尒偮偐傝傑偣傫",e);
		} catch(IOException e){
			throw new GSException("IO僄儔乕",e);
		}
	}

    /**
     *
     */
	public final synchronized void Save() throws GSException{
		try {
			OutputStreamWriter osw =  new OutputStreamWriter( new FileOutputStream(GetFile()),enc);
			PrintWriter pw = new PrintWriter(osw);

			Write(pw);

			pw.flush();
			pw.close();
		} catch(GSException e) {
			throw new GSException(e.toString(),e);
		} catch(IOException e) {
			throw new GSException("IO僄儔乕",e);
		}
	}

}