package ru.codeinside.gws.xml.normalizer.normalize.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Logger;

/**
 * A collection of different, general-purpose methods for JAVA-specific things
 *
 * @author Christian Geuer-Pollmann
 */
public class JavaUtils {

    /**
     * {@link org.apache.commons.logging} logging facility
     */
    private static Logger log = Logger.getLogger(JavaUtils.class.getName());

    private JavaUtils() {
        // we don't allow instantiation
    }

    /**
     * Method getBytesFromFile
     *
     * @param fileName
     * @return the bytes read from the file
     * @throws FileNotFoundException
     * @throws IOException
     */
    public static byte[] getBytesFromFile(String fileName)
            throws FileNotFoundException, IOException {

        byte refBytes[] = null;

        FileInputStream fisRef = null;
        UnsyncByteArrayOutputStream baos = null;
        try {
            fisRef = new FileInputStream(fileName);
            baos = new UnsyncByteArrayOutputStream();
            byte buf[] = new byte[1024];
            int len;

            while ((len = fisRef.read(buf)) > 0) {
                baos.write(buf, 0, len);
            }

            refBytes = baos.toByteArray();
        } finally {
            if (baos != null) {
                baos.close();
            }
            if (fisRef != null) {
                fisRef.close();
            }
        }

        return refBytes;
    }

    /**
     * Method writeBytesToFilename
     *
     * @param filename
     * @param bytes
     */
    public static void writeBytesToFilename(String filename, byte[] bytes) {
        FileOutputStream fos = null;
        try {
            if (filename != null && bytes != null) {
                File f = new File(filename);

                fos = new FileOutputStream(f);

                fos.write(bytes);
                fos.close();
            } else {
                log.fine("writeBytesToFilename got null byte[] pointed");
            }
        } catch (IOException ex) {
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException ioe) {
                    log.fine(ioe.toString());
                }
            }
        }
    }

    /**
     * This method reads all bytes from the given InputStream till EOF and
     * returns them as a byte array.
     *
     * @param inputStream
     * @return the bytes read from the stream
     * @throws FileNotFoundException
     * @throws IOException
     */
    public static byte[] getBytesFromStream(InputStream inputStream) throws IOException {
        UnsyncByteArrayOutputStream baos = null;

        byte[] retBytes = null;
        try {
            baos = new UnsyncByteArrayOutputStream();
            byte buf[] = new byte[4 * 1024];
            int len;

            while ((len = inputStream.read(buf)) > 0) {
                baos.write(buf, 0, len);
            }
            retBytes = baos.toByteArray();
        } finally {
            baos.close();
        }

        return retBytes;
    }
}