utils.java

一个数据挖掘软件ALPHAMINERR的整个过程的JAVA版源代码

/*
 *    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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

package eti.bi.util;


import java.io.BufferedWriter;
import java.io.EOFException;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.text.DecimalFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import eti.bi.common.Constants;
import eti.bi.exception.AppException;

/**
 * A utility class that perform the utility functions that can be used by all the
 * modules in the BI platform.
 * 
 * @since 		1.0
 * @version 	$Revision$ $Date$
 * @author		$Author$

 */
public class Utils {

	private static final String DATE_PATTERN = "yyyyMMdd";
	/**
	 * Copy a file
	 * @param aSrcFile The source of the file to be copied.
	 * @param aDstFile The destination of the file to be copied to.
	 * @throws IOException If any I/O error occurs.
	 */
	public static void copyFile(File aSrcFile, File aDstFile) throws IOException
	{
		RandomAccessFile aRAF1 = null;
		RandomAccessFile aRAF2 = null;
		try
		{
			aRAF1 = new RandomAccessFile(aSrcFile, "r");
			aRAF2 = new RandomAccessFile(aDstFile, "rw");
			while (true)
			{
				aRAF2.writeByte(aRAF1.readUnsignedByte());
			}
		}
		catch(EOFException e)
		{
		}
		catch(Exception e)
		{
			System.out.println("Utilss Exception Caught:"+e);
		}
		finally
		{
			aRAF1.close();
			aRAF2.close();
		}
	}
			
	public static Date parseDate(String aDateStr) throws ParseException
	{
		SimpleDateFormat aSDF = new SimpleDateFormat(DATE_PATTERN);
		return aSDF.parse(aDateStr);
	}

	public static String formatDate(Date aDate) throws ParseException
	{
		SimpleDateFormat aSDF = new SimpleDateFormat(DATE_PATTERN);
		return aSDF.format(aDate);
	}
	
	
	public static String formatBimlId(Long aBimlId)
	{
		DecimalFormat aDF = new DecimalFormat(Constants.BIML_ID_PATTERN);
		return aDF.format(aBimlId.longValue());
	}
		
	public static void exportToFile(String aContent, String aDestFilename) throws AppException
	{
		try {
			BufferedWriter aBufferedWriter = new BufferedWriter(new FileWriter(aDestFilename));
			aBufferedWriter.write(aContent);
			aBufferedWriter.flush();
			aBufferedWriter.close();
		} catch (Exception e) {
			System.err.println("Error exporting file: " + aDestFilename + " Exception: " + e.getMessage());
			throw new AppException("Error exporting file: " + aDestFilename, e);
		}
	}		
}