org.fcrepo.kernel.utils

Class ContentDigest

java.lang.Object

org.fcrepo.kernel.utils.ContentDigest

public abstract class ContentDigest
extends java.lang.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 java.util.Map<java.lang.String,java.lang.String>	algorithmToScheme
static java.lang.String	DEFAULT_ALGORITHM
static java.util.Map<java.lang.String,java.lang.String>	schemeToAlgorithm

Constructor Summary

Constructors

Constructor and Description
ContentDigest()

Method Summary

Methods

Modifier and Type	Method and Description
static java.net.URI	asURI(java.lang.String algorithm, byte[] data) Convert a MessageDigest algorithm and checksum byte-array data to a URN
static java.net.URI	asURI(java.lang.String algorithm, java.lang.String value) Convert a MessageDigest algorithm and checksum value to a URN
static java.lang.String	getAlgorithm(java.net.URI digestUri) Given a digest URI, get the corresponding MessageDigest algorithm
static java.net.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 java.util.Map<java.lang.String,java.lang.String> algorithmToScheme

schemeToAlgorithm

public static final java.util.Map<java.lang.String,java.lang.String> schemeToAlgorithm

DEFAULT_ALGORITHM

public static final java.lang.String DEFAULT_ALGORITHM

See Also:

Constant Field Values

Constructor Detail

ContentDigest

public ContentDigest()

Method Detail

asURI

public static java.net.URI asURI(java.lang.String algorithm,
                 java.lang.String value)

Convert a MessageDigest algorithm and checksum value to a URN

Parameters:

algorithm -

value -

Returns:

URI

asURI

public static java.net.URI asURI(java.lang.String algorithm,
                 byte[] data)

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

Parameters:

algorithm -

data -

Returns:

URI

getAlgorithm

public static java.lang.String getAlgorithm(java.net.URI digestUri)

Given a digest URI, get the corresponding MessageDigest algorithm

Parameters:

digestUri -

Returns:

MessageDigest algorithm

missingChecksum

public static java.net.URI missingChecksum()

Placeholder checksum value.

Returns:

URI