de.alpharogroup.file.checksum

Class ChecksumUtils

java.lang.Object

de.alpharogroup.file.checksum.ChecksumUtils

public final class ChecksumUtils
extends Object

The Class ChecksumUtils is a utility class for computing checksum from files and byte arrays.

Version:

1.0

Author:

Asterios Raptis

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.apache.log4j.Logger	LOGGER The LOGGER.

Method Summary

Modifier and Type	Method and Description
static String	getChecksum(byte[] bytes, de.alpharogroup.file.checksum.Algorithm algorithm) Gets the checksum from the given byte array with an instance of.
static String	getChecksum(Byte[] bytes, de.alpharogroup.file.checksum.Algorithm algorithm) Gets the checksum from the given byte array with an instance of.
static String	getChecksum(byte[] bytes, String algorithm) Gets the checksum from the given byte array with an instance of.
static String	getChecksum(Byte[] bytes, String algorithm) Gets the checksum from the given byte array with an instance of.
static String	getChecksum(File file, de.alpharogroup.file.checksum.Algorithm algorithm) Gets the checksum from the given file with an instance of the given algorithm.
static long	getChecksum(File file, boolean crc) Gets the checksum from the given file.
static String	getChecksum(File file, String algorithm) Gets the checksum from the given file with an instance of the given algorithm.
static long	getCheckSumAdler32(byte[] bytes) Gets the checksum from the given byte array with an instance of.
static long	getCheckSumAdler32(File file) Gets the checksum from the given file with an instance of.
static long	getCheckSumCRC32(byte[] bytes) Gets the checksum from the given byte array with an instance of.
static long	getCheckSumCRC32(File file) Gets the checksum from the given file with an instance of.
static String	getChecksumQuietly(byte[] bytes, de.alpharogroup.file.checksum.Algorithm algorithm) Gets the checksum quietly from the given byte array with an instance of.
static String	getChecksumQuietly(byte[] bytes, String algorithm) Gets the checksum quietly from the given byte array with an instance of.
static String	getChecksumQuietly(Byte[] bytes, String algorithm) Gets the checksum quietly from the given byte array with an instance of.
static String	getChecksumQuietly(File file, de.alpharogroup.file.checksum.Algorithm algorithm) Gets the checksum quietly from the given file with an instance of the given algorithm.
static void	main(String[] args) The main method.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOGGER

protected static final org.apache.log4j.Logger LOGGER

The LOGGER.

Method Detail

getChecksum

public static String getChecksum(byte[] bytes,
                                 de.alpharogroup.file.checksum.Algorithm algorithm)
                          throws NoSuchAlgorithmException

Gets the checksum from the given byte array with an instance of.

Parameters:

bytes - the byte array.

algorithm - the algorithm to get the checksum. This could be for instance "MD4", "MD5", "SHA-1", "SHA-256", "SHA-384" or "SHA-512".

Returns:

The checksum from the file as a String object.

Throws:

NoSuchAlgorithmException - Is thrown if the algorithm is not supported or does not exists. MessageDigest object.

getChecksum

public static String getChecksum(byte[] bytes,
                                 String algorithm)
                          throws NoSuchAlgorithmException

Gets the checksum from the given byte array with an instance of.

Parameters:

bytes - the byte array.

algorithm - the algorithm to get the checksum. This could be for instance "MD4", "MD5", "SHA-1", "SHA-256", "SHA-384" or "SHA-512".

Returns:

The checksum from the file as a String object.

Throws:

NoSuchAlgorithmException - Is thrown if the algorithm is not supported or does not exists. MessageDigest object.

getChecksum

public static String getChecksum(Byte[] bytes,
                                 de.alpharogroup.file.checksum.Algorithm algorithm)
                          throws NoSuchAlgorithmException

Gets the checksum from the given byte array with an instance of.

Parameters:

bytes - the Byte object array.

algorithm - the algorithm to get the checksum. This could be for instance "MD4", "MD5", "SHA-1", "SHA-256", "SHA-384" or "SHA-512".

Returns:

The checksum from the file as a String object.

Throws:

NoSuchAlgorithmException - Is thrown if the algorithm is not supported or does not exists. MessageDigest object.

getChecksum

public static String getChecksum(Byte[] bytes,
                                 String algorithm)
                          throws NoSuchAlgorithmException

Gets the checksum from the given byte array with an instance of.

Parameters:

bytes - the Byte object array.

algorithm - the algorithm to get the checksum. This could be for instance "MD4", "MD5", "SHA-1", "SHA-256", "SHA-384" or "SHA-512".

Returns:

The checksum from the file as a String object.

Throws:

NoSuchAlgorithmException - Is thrown if the algorithm is not supported or does not exists. MessageDigest object.

getChecksum

public static String getChecksum(File file,
                                 de.alpharogroup.file.checksum.Algorithm algorithm)
                          throws NoSuchAlgorithmException

Gets the checksum from the given file with an instance of the given algorithm.

Parameters:

file - the file.

algorithm - the algorithm to get the checksum. This could be for instance "MD4", "MD5", "SHA-1", "SHA-256", "SHA-384" or "SHA-512".

Returns:

The checksum from the file as a String object.

Throws:

NoSuchAlgorithmException - Is thrown if the algorithm is not supported or does not exists. MessageDigest object.

getChecksum

public static long getChecksum(File file,
                               boolean crc)
                        throws FileNotFoundException,
                               IOException

Gets the checksum from the given file. If the flag crc is true than the CheckedInputStream is constructed with an instance of java.util.zip.CRC32 otherwise with an instance of java.util.zip.Adler32.

Parameters:

file - The file The file from what to get the checksum.

crc - The crc If the flag crc is true than the CheckedInputStream is constructed with an instance of CRC32 object otherwise it is constructed with an instance of

Returns:

The checksum from the given file as long.

Throws:

FileNotFoundException - Is thrown if the file is not found.

IOException - Signals that an I/O exception has occurred. CRC32 object otherwise it is constructed with an instance of Adler32 object. Adler32 object.

getChecksum

public static String getChecksum(File file,
                                 String algorithm)
                          throws NoSuchAlgorithmException

Gets the checksum from the given file with an instance of the given algorithm.

Parameters:

file - the file.

algorithm - the algorithm to get the checksum. This could be for instance "MD4", "MD5", "SHA-1", "SHA-256", "SHA-384" or "SHA-512".

Returns:

The checksum from the file as a String object.

Throws:

NoSuchAlgorithmException - Is thrown if the algorithm is not supported or does not exists. MessageDigest object.

getCheckSumAdler32

public static long getCheckSumAdler32(byte[] bytes)

Gets the checksum from the given byte array with an instance of.

Parameters:

bytes - The byte array.

Returns:

The checksum from the byte array as long. Adler32 object.

getCheckSumAdler32

public static long getCheckSumAdler32(File file)

Gets the checksum from the given file with an instance of.

Parameters:

file - The file.

Returns:

The checksum from the file as long. Adler32 object.

getCheckSumCRC32

public static long getCheckSumCRC32(byte[] bytes)

Gets the checksum from the given byte array with an instance of.

Parameters:

bytes - The byte array.

Returns:

The checksum from the byte array as long. CRC32 object.

getCheckSumCRC32

public static long getCheckSumCRC32(File file)

Gets the checksum from the given file with an instance of.

Parameters:

file - The file.

Returns:

The checksum from the file as long. CRC32 object.

getChecksumQuietly

public static String getChecksumQuietly(byte[] bytes,
                                        de.alpharogroup.file.checksum.Algorithm algorithm)

Gets the checksum quietly from the given byte array with an instance of.

Parameters:

bytes - the byte array.

algorithm - the algorithm to get the checksum. This could be for instance "MD4", "MD5", "SHA-1", "SHA-256", "SHA-384" or "SHA-512".

Returns:

The checksum from the file as a String object.

getChecksumQuietly

public static String getChecksumQuietly(byte[] bytes,
                                        String algorithm)

Gets the checksum quietly from the given byte array with an instance of.

Parameters:

bytes - the byte array.

algorithm - the algorithm to get the checksum. This could be for instance "MD4", "MD5", "SHA-1", "SHA-256", "SHA-384" or "SHA-512".

Returns:

The checksum from the file as a String object.

getChecksumQuietly

public static String getChecksumQuietly(Byte[] bytes,
                                        String algorithm)

Gets the checksum quietly from the given byte array with an instance of.

Parameters:

bytes - the Byte object array.

algorithm - the algorithm to get the checksum. This could be for instance "MD4", "MD5", "SHA-1", "SHA-256", "SHA-384" or "SHA-512".

Returns:

The checksum from the file as a String object.

getChecksumQuietly

public static String getChecksumQuietly(File file,
                                        de.alpharogroup.file.checksum.Algorithm algorithm)

Gets the checksum quietly from the given file with an instance of the given algorithm.

Parameters:

file - the file.

algorithm - the algorithm to get the checksum. This could be for instance "MD4", "MD5", "SHA-1", "SHA-256", "SHA-384" or "SHA-512".

Returns:

The checksum from the file as a String object or null if a NoSuchAlgorithmException will be thrown. exists. MessageDigest object.

main

public static void main(String[] args)
                 throws FileNotFoundException,
                        IOException,
                        NoSuchAlgorithmException

The main method.

Parameters:

args - The args

Throws:

FileNotFoundException - Is thrown if the file is not found.

IOException - Signals that an I/O exception has occurred.

NoSuchAlgorithmException - Is thrown if the algorithm is not supported or does not exists.