Package org.eclipse.aether.util

Class ChecksumUtils

java.lang.Object

org.eclipse.aether.util.ChecksumUtils

public final class ChecksumUtils
extends Object

A utility class to assist in the verification and generation of checksums.

Method Summary

Modifier and Type	Method	Description
static Map<String,Object>	calc(byte[] dataBytes, Collection<String> algos)
static Map<String,Object>	calc(File dataFile, Collection<String> algos)	Calculates checksums for the specified file.
static String	read(File checksumFile)	Extracts the checksum from the specified file.
static String	toHexString(byte[] bytes)	Creates a hexadecimal representation of the specified bytes.

Methods inherited from class java.lang.Object

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

Method Detail

read

public static String read(File checksumFile)
                   throws IOException

Extracts the checksum from the specified file.

Parameters:

checksumFile - The path to the checksum file, must not be null.

Returns:

The checksum stored in the file, never null.

Throws:

IOException - If the checksum does not exist or could not be read for other reasons.

calc

public static Map<String,Object> calc(File dataFile,
                                            Collection<String> algos)
                                     throws IOException

Calculates checksums for the specified file.

Parameters:

dataFile - The file for which to calculate checksums, must not be null.

algos - The names of checksum algorithms (cf. MessageDigest.getInstance(String) to use, must not be null.

Returns:

The calculated checksums, indexed by algorithm name, or the exception that occurred while trying to calculate it, never null.

Throws:

IOException - If the data file could not be read.

calc

public static Map<String,Object> calc(byte[] dataBytes,
                                            Collection<String> algos)
                                     throws IOException

Throws:

IOException

toHexString

public static String toHexString(byte[] bytes)

Creates a hexadecimal representation of the specified bytes. Each byte is converted into a two-digit hex number and appended to the result with no separator between consecutive bytes.

Parameters:

bytes - The bytes to represent in hex notation, may be be null.

Returns:

The hexadecimal representation of the input or null if the input was null.