Java Byte Array Create toBytes(int data)

Description

Converts an int to a byte array with 4 elements.

License

Open Source License

Parameter

Parameter	Description
data	the int to convert

Return

the resulting byte[] array

Declaration

public static byte[] toBytes(int data) 

Method Source Code

//package com.java2s;
/*//from w ww. java 2 s .c  o m
 * This file is part of the LIRe project: http://www.semanticmetadata.net/lire
 * LIRe 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.
 *
 * LIRe 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 LIRe; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * We kindly ask you to refer the following paper in any publication mentioning Lire:
 *
 * Lux Mathias, Savvas A. Chatzichristofis. Lire: Lucene Image Retrieval ?
 * An Extensible Java CBIR Library. In proceedings of the 16th ACM International
 * Conference on Multimedia, pp. 1085-1088, Vancouver, Canada, 2008
 *
 * http://doi.acm.org/10.1145/1459359.1459577
 *
 * Copyright statement:
 * --------------------
 * (c) 2002-2011 by Mathias Lux (mathias@juggle.at)
 *     http://www.semanticmetadata.net/lire
 */

public class Main {
    /**
     * Converts an int to a byte array with 4 elements. Used to put ints into a byte[] payload in a convenient
     * and fast way by shifting without using streams (which is kind of slow). <br/>
     * Taken from http://www.daniweb.com/code/snippet216874.html
     *
     * @param data the int to convert
     * @return the resulting byte[] array
     * @see net.semanticmetadata.lire.utils.SerializationUtils#toInt(byte[])
     */
    public static byte[] toBytes(int data) {
        return new byte[] { (byte) ((data >> 24) & 0xff),
                (byte) ((data >> 16) & 0xff), (byte) ((data >> 8) & 0xff),
                (byte) ((data >> 0) & 0xff), };
    }

    /**
     * Converts a long to a byte[] array.<br/>
     * Taken from http://www.daniweb.com/software-development/java/code/216874
     *
     * @param data the long to convert
     * @return the resulting byte[] array
     * @see #toLong(byte[])
     */
    public static byte[] toBytes(long data) {
        return new byte[] { (byte) ((data >> 56) & 0xff),
                (byte) ((data >> 48) & 0xff), (byte) ((data >> 40) & 0xff),
                (byte) ((data >> 32) & 0xff), (byte) ((data >> 24) & 0xff),
                (byte) ((data >> 16) & 0xff), (byte) ((data >> 8) & 0xff),
                (byte) ((data >> 0) & 0xff), };
    }

    /**
     * Converts a float to a byte array with 4 elements. Used to put floats into a byte[] payload in a convenient
     * and fast way by shifting without using streams (which is kind of slow). Use
     * {@link net.semanticmetadata.lire.utils.SerializationUtils#toFloat(byte[])} to decode.
     *
     * @param data the float to convert
     * @return the resulting byte array
     * @see net.semanticmetadata.lire.utils.SerializationUtils#toFloat(byte[])
     */
    public static byte[] toBytes(float data) {
        return toBytes(Float.floatToRawIntBits(data));
    }

    /**
     * Converts a double to a byte array with 4 elements. Used to put doubles into a byte[] payload in a convenient
     * and fast way by shifting without using streams (which is kind of slow). Use
     * {@link net.semanticmetadata.lire.utils.SerializationUtils#toDouble(byte[])} to decode. Note that there is a loss
     * in precision as the double is converted to a float in the course of conversion.
     *
     * @param data the double to convert
     * @return the resulting byte array
     * @see net.semanticmetadata.lire.utils.SerializationUtils#toDouble(byte[])
     */
    public static byte[] toBytes(double data) {
        return toBytes(Double.doubleToLongBits(data));
    }
}

Related

1. toBytes(final long val)
2. toBytes(final String hexaString)
3. toBytes(final String str)
4. toBytes(final String text)
5. toBytes(int data)
6. toBytes(int i)
7. toBytes(int i)
8. toBytes(int i)
9. toBytes(int i)