org.fcrepo.kernel.api.utils

Class ContentDigest

java.lang.Object

org.fcrepo.kernel.api.utils.ContentDigest

public final class ContentDigest
extends Object

Digest helpers to convert digests (checksums) into URI strings (based loosely on Magnet URIs)

Since:

Mar 6, 2013

Author:

Chris Beer

Field Summary

Fields

Modifier and Type	Field and Description
static Map<String,String>	algorithmToScheme
static String	DEFAULT_ALGORITHM
static Map<String,String>	schemeToAlgorithm

Method Summary

Modifier and Type	Method and Description
static URI	asURI(String algorithm, byte[] data) Convert a MessageDigest algorithm and checksum byte-array data to a URN
static URI	asURI(String algorithm, String value) Convert a MessageDigest algorithm and checksum value to a URN
static String	getAlgorithm(URI digestUri) Given a digest URI, get the corresponding MessageDigest algorithm
static URI	missingChecksum() Placeholder checksum value.

Methods inherited from class java.lang.Object

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

Field Detail

algorithmToScheme

public static final Map<String,String> algorithmToScheme

schemeToAlgorithm

public static final Map<String,String> schemeToAlgorithm

DEFAULT_ALGORITHM

public static final String DEFAULT_ALGORITHM

See Also:

Constant Field Values

Method Detail

asURI

public static URI asURI(String algorithm,
                        String value)

Convert a MessageDigest algorithm and checksum value to a URN

Parameters:

algorithm - the message digest algorithm

value - the checksum value

Returns:

URI

asURI

public static URI asURI(String algorithm,
                        byte[] data)

Convert a MessageDigest algorithm and checksum byte-array data to a URN

Parameters:

algorithm - the message digest algorithm

data - the checksum byte-array data

Returns:

URI

getAlgorithm

public static String getAlgorithm(URI digestUri)

Given a digest URI, get the corresponding MessageDigest algorithm

Parameters:

digestUri - the digest uri

Returns:

MessageDigest algorithm

missingChecksum

public static URI missingChecksum()

Placeholder checksum value.

Returns:

URI