/*
 * Copyright (C) The Apache Software Foundation. All rights reserved.
 *
 * This software is published under the terms of the Apache Software
 * License version 1.1, a copy of which has been included with this
 * distribution in the LICENSE.txt file.  */

package org.apache.log4j;

import java.io.IOException;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.spi.LoggingEvent;

/**
   DateFormatFileAppender extends {@link FileAppender} so each log is 
   named based on a date format defined in the File property.

   Samples File: 'logs/'yyyy/MM-MMM/dd-EEE/HH-mm-ss-S'.log'
   Makes a file like: logs/2004/04-Apr/13-Tue/09-45-15-937.log
   @author James Stauffer */
public class DateFormatFileAppender extends FileAppender {

  /**
     The default constructor does nothing. */
  public DateFormatFileAppender() {
  }

  /**
    Instantiate a <code>DailyRollingFileAppender</code> and open the
    file designated by <code>filename</code>. The opened filename will
    become the ouput destination for this appender.
    */
  public DateFormatFileAppender (Layout layout, String filename) throws IOException {
    super(layout, filename, true);
  }

  public
  synchronized
  void setFile(String fileName, boolean append, boolean bufferedIO, int bufferSize)
                                                            throws IOException {
    SimpleDateFormat sdf = new SimpleDateFormat(fileName);
    String actualFileName = sdf.format(new Date());
    makeDirs(actualFileName);
    super.setFile(actualFileName, append, bufferedIO, bufferSize);
  }

  /**
   * Ensures that all of the directories for the given path exist.
   * Anything after the last / or \ is assumed to be a filename.
   * @author James Stauffer
   */
  private void makeDirs (String path) {
    int indexSlash = path.lastIndexOf("/");
    int indexBackSlash = path.lastIndexOf("\\");
    int index = Math.max(indexSlash, indexBackSlash);
    if(index > 0) {
        String dirs = path.substring(0, index);
        new File(dirs).mkdirs();
    }
  }

}