/**************************************************************************/
/*
/* IOUtil.java
/* Copyright (C) 2001 Bjorn Bringert (bjorn@mumblebee.com)
/*
/* 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
/*
/**************************************************************************/


package com.mumblebee.util;

import java.io.*;
import java.net.URL;

/**
 *  Some I/O utility methods.
 * @author Bjorn Bringert
 */
public class IOUtil {

	/** Prevents instantiation. */
	private IOUtil() {}

	/**
	 * Copies a file.
	 * @param src The file to copy from
	 * @param dest The file to copy to
	 * @param overwrite if true, the destination file will be overwritten if it exists.
	 * @throws FileExistsException if overwrite is false and the destination file exists
	 * @throws FileNotFoundException if the source file does not exist
	 * @throws IOException if an I/O error occurs
	 */
	public static void copy(File src, File dest, boolean overwrite)
			throws FileExistsException, FileNotFoundException, IOException  {
		FileInputStream in = new FileInputStream(src);
		save(in, dest, overwrite);
	}

	/**
	 * Saves the contents of a stream to a file and closes the stream.
	 * @param inStream The stream to read from
	 * @param file The file to write to
	 * @param overwrite if true, the file will be overwritten if it exists.
	 * @throws FileExistsException if overwrite is false and the file exists
	 * @throws IOException if an I/O error occurs
	 */
	public static void save(InputStream inStream, File file, boolean overwrite) throws FileExistsException, IOException {
		if (!overwrite && file.exists()) throw new FileExistsException(file + " already exists");
		FileOutputStream out = new FileOutputStream(file);
		copy(inStream, out);
		out.close();
		inStream.close();
	}

	/**
	 * Writes all data from an input stream to an output stream. Doesn't close any
	 * of the streams.
	 * @param in the stream to read from
	 * @param out the stream to write to
	 * @throws IOException if an I/O error occurs
	 */
	public static void copy(InputStream in, OutputStream out) throws IOException {
		byte[] buf = new byte[2048];
		int r;
		while ((r = in.read(buf)) != -1) {
			out.write(buf, 0, r);
		}
	}

}