Utils.java

package org.molgenis.designgg;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

/**
 * Contains several methods used in more than one class and even in several
 * layers.
 * 
 * @author Steffan Jacobs
 * 
 */
public class Utils
{

	/**
	 * Deletes a directory whether empty or not.
	 * 
	 * @param path
	 *            Directory to delete
	 * @return Boolean indicating whether the directory was deleted successfully
	 */
	public static boolean deleteDirectory(File path)
	{
		if (path.exists())
		{
			File[] files = path.listFiles();
			for (int i = 0; i < files.length; i++)
			{
				if (files[i].isDirectory())
				{
					deleteDirectory(files[i]);
				}
				else
				{
					files[i].delete();
				}
			}
		}
		return (path.delete());
	}

	/**
	 * Retrieves a file from the harddrive.
	 * 
	 * @param completefilename
	 *            File name of a file to retrieve
	 * @return Byte array of the file.
	 * @throws Exception
	 *             Any Exception that occurred.
	 */
	public static byte[] getFile(String completefilename) throws Exception
	{
		// Same as FileRepository.getFile()

		// Open the file and then get a channel from the stream
		FileInputStream fis = new FileInputStream(completefilename);
		FileChannel fc = fis.getChannel();

		// Get the file's size and then map it into memory
		int sz = (int) fc.size();
		byte[] filebytes = new byte[sz];
		MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, sz);

		int i = 0;
		while (bb.hasRemaining())
		{
			filebytes[i] = bb.get();
			i++;
		}

		fis.close();

		return filebytes;
	}

	/**
	 * Retrieves a file from the harddrive.
	 * 
	 * @param completefilename
	 *            File name of a file to retrieve
	 * @return Byte array of the file.
	 * @throws Exception
	 *             Any Exception that occurred.
	 */
	public static void setFile(String fullFileName, byte[] fileContent) throws Exception
	{
		File f = new File(fullFileName);
		f.getParentFile().mkdirs();

		// Open the file and then get a channel from the stream
		FileOutputStream fos = new FileOutputStream(fullFileName);
		FileChannel fc = fos.getChannel();
		ByteBuffer bb = ByteBuffer.wrap(fileContent);
		fc.write(bb);

		// Get the file's size and then map it into memory
		// int fileSize = fileContent.length;

		// MappedByteBuffer mbb = fc.map( FileChannel.MapMode.READ_WRITE, 0,
		// fileSize);
		// We write the contents of the file with one shot
		// mbb.put(fileContent);

		fos.close();
	}

	/**
	 * Get's the system's temporary directory
	 * 
	 * @return File Object representing the directory.
	 */
	public static File getSystemTempDir()
	{
		// find the system tempdir
		String tmpdir = System.getProperty("java.io.tmpdir");
		if (!(tmpdir.endsWith("/") || tmpdir.endsWith("\\")))
		{
			tmpdir = tmpdir + System.getProperty("file.separator");
		}
		return new File(tmpdir);
	}

}