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Hibernate example source code file (BytesHelper.java)

This example Hibernate source code file (BytesHelper.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

byteshelper, byteshelper, expecting, expecting, illegalargumentexception, string, string, stringbuffer, stringbuffer

The Hibernate BytesHelper.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.internal.util;


public final class BytesHelper {

	private BytesHelper() {
	}

	/**
	 * Custom algorithm used to generate an int from a series of bytes.
	 * <p/>
	 * NOTE : this is different than interpreting the incoming bytes as an int value!
	 *
	 * @param bytes The bytes to use in generating the int.
	 *
	 * @return The generated int.
	 */
	public static int toInt(byte[] bytes) {
		int result = 0;
		for ( int i = 0; i < 4; i++ ) {
			result = ( result << 8 ) - Byte.MIN_VALUE + (int) bytes[i];
		}
		return result;
	}

	/**
	 * Interpret a short as its binary form
	 *
	 * @param shortValue The short to interpret to binary
	 *
	 * @return The binary
	 */
	public static byte[] fromShort(int shortValue) {
		byte[] bytes = new byte[2];
		bytes[0] = (byte) ( shortValue >> 8 );
		bytes[1] = (byte) ( ( shortValue << 8 ) >> 8 );
		return bytes;
	}

	/**
	 * Interpret an int as its binary form
	 *
	 * @param intValue The int to interpret to binary
	 *
	 * @return The binary
	 */
	public static byte[] fromInt(int intValue) {
		byte[] bytes = new byte[4];
		bytes[0] = (byte) ( intValue >> 24 );
		bytes[1] = (byte) ( ( intValue << 8 ) >> 24 );
		bytes[2] = (byte) ( ( intValue << 16 ) >> 24 );
		bytes[3] = (byte) ( ( intValue << 24 ) >> 24 );
		return bytes;
	}

	/**
	 * Interpret a long as its binary form
	 *
	 * @param longValue The long to interpret to binary
	 *
	 * @return The binary
	 */
	public static byte[] fromLong(long longValue) {
		byte[] bytes = new byte[8];
		bytes[0] = (byte) ( longValue >> 56 );
		bytes[1] = (byte) ( ( longValue << 8 ) >> 56 );
		bytes[2] = (byte) ( ( longValue << 16 ) >> 56 );
		bytes[3] = (byte) ( ( longValue << 24 ) >> 56 );
		bytes[4] = (byte) ( ( longValue << 32 ) >> 56 );
		bytes[5] = (byte) ( ( longValue << 40 ) >> 56 );
		bytes[6] = (byte) ( ( longValue << 48 ) >> 56 );
		bytes[7] = (byte) ( ( longValue << 56 ) >> 56 );
		return bytes;
	}

	/**
	 * Interpret the binary representation of a long.
	 *
	 * @param bytes The bytes to interpret.
	 *
	 * @return The long
	 */
	public static long asLong(byte[] bytes) {
		if ( bytes == null ) {
			return 0;
		}
		if ( bytes.length != 8 ) {
			throw new IllegalArgumentException( "Expecting 8 byte values to construct a long" );
		}
		long value = 0;
        for (int i=0; i<8; i++) {
			value = (value << 8) | (bytes[i] & 0xff);
		}
		return value;
	}

	public static String toBinaryString(byte value) {
		String formatted = Integer.toBinaryString( value );
		if ( formatted.length() > 8 ) {
			formatted = formatted.substring( formatted.length() - 8 );
		}
		StringBuffer buf = new StringBuffer( "00000000" );
		buf.replace( 8 - formatted.length(), 8, formatted );
		return buf.toString();
	}

	public static String toBinaryString(int value) {
		String formatted = Long.toBinaryString( value );
		StringBuffer buf = new StringBuffer( StringHelper.repeat( '0', 32 ) );
		buf.replace( 64 - formatted.length(), 64, formatted );
		return buf.toString();
	}

	public static String toBinaryString(long value) {
		String formatted = Long.toBinaryString( value );
		StringBuffer buf = new StringBuffer( StringHelper.repeat( '0', 64 ) );
		buf.replace( 64 - formatted.length(), 64, formatted );
		return buf.toString();
	}
}

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