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Repository is a project created by Jhonathan Camacho to facilitate the file management in local and remote repositories.

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package br.com.jhonsapp.repository.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.FileSystemNotFoundException;

/**
 * This class is a file utility.
 * 
 * @author Jhonathan Camacho
 */
public class FileUtil {

	/**
	 * Convert the file in bytes.
	 * 
	 * @param file
	 *            the file to be converted.
	 * 
	 * @return the file in byte.
	 * 
	 * @throws FileSystemNotFoundException
	 *             if was an error converting the file to the byte array.
	 */
	public static byte[] convertToByte(File file) {

		try {
			BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
			byte[] bytes = new byte[in.available()];
			in.read(bytes);
			in.close();

			return bytes;

		} catch (IOException e) {
			throw new FileSystemNotFoundException(
					"There was an error converting the file to the byte array. Possibly the file does not exist.");
		}
	}

	/**
	 * Convert the bytes in file.
	 * 
	 * @param bytes
	 *            the bytes to be converted.
	 * 
	 * @param fileName
	 *            the name of the file converted.
	 * 
	 * @return the byte in file.
	 * 
	 * @throws FileSystemNotFoundException
	 *             if was an error converting the byte array to the file.
	 */
	public static File convertToFile(byte[] bytes, String fileName) {

		try {
			File file = new File(fileName);
			BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
			bos.write(bytes);
			bos.close();

			return file;

		} catch (IOException e) {
			throw new FileSystemNotFoundException(
					"There was an error converting the byte array to the file. Possibly the file does not exist.");
		}
	}
	
	/**
	 * Verify if the bytes is null or empty.
	 * 
	 * @param bytes
	 *            the bytes that will be verified.
	 * 
	 * @return true if the bytes is null or empty. Return false otherwise.
	 */
	public static boolean isInvalid(byte[] bytes) {
		return bytes == null || bytes.length == 0;
	}

	/**
	 * Verify if the bytes is not blank.
	 * 
	 * @param bytes
	 *            the bytes that will be verified.
	 * 
	 * @return true if the bytes is not blank. Return false otherwise.
	 */
	public static boolean isValid(byte[] bytes) {
		return bytes != null && bytes.length > 0;
	}

	/**
	 * Verify if the file is null or empty.
	 * 
	 * @param file
	 *            the bytes that will be verified.
	 * 
	 * @return true if the bytes is null or empty. Return false otherwise.
	 */
	public static boolean isInvalid(File file) {
		return file == null || file.length() == 0;
	}

	/**
	 * Verify if the file is not blank.
	 * 
	 * @param file
	 *            the bytes that will be verified.
	 * 
	 * @return true if the bytes is not blank. Return false otherwise.
	 */
	public static boolean isValid(File file) {
		return file != null && file.length() > 0;
	}

}