bt.data.digest

Class JavaSecurityDigester

java.lang.Object

bt.data.digest.JavaSecurityDigester

All Implemented Interfaces:

Digester

public class JavaSecurityDigester
extends Object
implements Digester

A class to produce arbitrary digests for DataRange or Range. Uses java security libraries to produce the digests

Constructor Summary

Constructors

Constructor and Description
JavaSecurityDigester(String algorithm, int step)

Method Summary

Modifier and Type	Method and Description
Digester	createCopy() Clone the digester so any thread local variables will be cleaned up when the clone is GC'd
byte[]	digest(DataRange data) Calculates a digest of a data range.
byte[]	digest(Range<?> data) Calculates Digest of a binary range.
byte[]	digestForced(DataRange data) Calculates a digest of a data range.
String	getAlgorithm()
int	length() Return the length of this digest

Methods inherited from class java.lang.Object

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

Constructor Detail

JavaSecurityDigester

public JavaSecurityDigester(String algorithm,
                            int step)

Method Detail

getAlgorithm

public String getAlgorithm()

digest

public byte[] digest(DataRange data)

Description copied from interface: Digester

Calculates a digest of a data range.

Important: If some of the data can't be read immediately (e.g. due to idiosyncrasies of underlying storage), then this method may return incorrect result.

Specified by:

digest in interface Digester

Returns:

Digest (depends on the algorithm being used)

digestForced

public byte[] digestForced(DataRange data)

Description copied from interface: Digester

Calculates a digest of a data range. Throws IllegalStateException if any StorageUnit does not return enough data.

Specified by:

digestForced in interface Digester

Returns:

Digest (depends on the algorithm being used)

digest

public byte[] digest(Range<?> data)

Description copied from interface: Digester

Calculates Digest of a binary range.

Specified by:

digest in interface Digester

Returns:

Digest (depends on the algorithm being used)

length

public int length()

Description copied from interface: Digester

Return the length of this digest

Specified by:

length in interface Digester

Returns:

the length of this digest

createCopy

public Digester createCopy()

Description copied from interface: Digester

Clone the digester so any thread local variables will be cleaned up when the clone is GC'd

Specified by:

createCopy in interface Digester

Returns:

the copy of the digester