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.
  • Constructor Details

    • ChecksumUtils

      private ChecksumUtils()
  • Method Details

    • 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
    • calc

      private static Map<String,Object> calc(InputStream data, 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.