Package com.liusoft.dlog4j

Source Code of com.liusoft.dlog4j.TextCacheManager

/*
*  TextCacheManager.java
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  This program is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU Library General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with this program; if not, write to the Free Software
*  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*  Author: Winter Lau
*  http://dlog4j.sourceforge.net
*  2006-5-12
*/
package com.liusoft.dlog4j;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.liusoft.dlog4j.util.StringUtils;

/**
* ���ı����洦��
* {base}/{type}/{id/10000}/id.htm
* @author liudong
* @call_by
*/
public class TextCacheManager {
 
  private final static Log log = LogFactory.getLog(TextCacheManager.class);
 
  private static String basePath;

  /**
   * ��ʼ�����Ŀ¼
   * @param arg0
   */
  public synchronized static void init(String arg0){
    if(basePath == null){
      if(!StringUtils.equals("/", File.separator))
        basePath = StringUtils.replace(arg0, "/", File.separator);
      else
        basePath = arg0;
      if(!basePath.endsWith(File.separator))
        basePath += File.separator;
      File f = new File(basePath);
      if(!f.exists())
        f.mkdirs();
    }
  }
 
  /**
   * �������ͺͱ������ȡ�ı�����
   * @param type
   * @param id
   * @return
   */
  public static String getTextContent(int type, long id){
    String path = getFilePath(type, id);
    BufferedReader br = null;
    StringBuffer text = new StringBuffer();
    try{
      String line_sep = System.getProperty("line.separator");
      if(line_sep==null)
        line_sep = "\r\n";
      br = new BufferedReader(new FileReader(path));
      do{
        String line = br.readLine();
        if(line == null)
          break;
        text.append(line);
        text.append(line_sep);
      }while(true);
      return text.toString();
    }catch(FileNotFoundException e){
    }catch(IOException e){
      log.error("Exception occur when reading " + path, e);
    }finally{
      if(br!=null){
        try{
          br.close();
        }catch(IOException e){}
      }
      text = null;
    }
    return null;
  }
 
  /**
   * ���»����ı�������
   * @param type
   * @param id
   * @param text
   */
  public static void updateTextContent(int type, long id, String text){
    if(text==null)
      return;
    String path = getFilePath(type, id);
    FileOutputStream fos = null;
    try{
      File f = new File(path);
      if(!f.getParentFile().exists())
        f.getParentFile().mkdirs();
      fos = new FileOutputStream(f);
      fos.write(text.getBytes());
    }catch(IOException e){
      log.error("Exception occur when writing to " + path, e);
    }finally{
      if(fos!=null){
        try{
          fos.close();
        }catch(Exception e){}
      }
    }
  }
 
  /**
   * ɾ��һ�������ı�
   * @param type
   * @param id
   * @return
   */
  public static boolean deleteTextContent(int type, long id){
    String path = getFilePath(type, id);
    return new File(path).delete();
  }
 
  /**
   * ���ر�Ŷ�Ӧ���ļ�·��
   * @param type
   * @param id
   * @return
   */
  protected static String getFilePath(int type, long id){
    StringBuffer sb = new StringBuffer(basePath);
    sb.append(type);
    sb.append(File.separator);
    sb.append(id/10000);
    sb.append(File.separator);
    sb.append(id);
    sb.append(".htm");
    return sb.toString();
  }
 
}
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