Package org.fcrepo.persistence.common

Class MultiDigestInputStreamWrapper

java.lang.Object

org.fcrepo.persistence.common.MultiDigestInputStreamWrapper

public class MultiDigestInputStreamWrapper
extends Object

Wrapper for an InputStream that allows for the computation and evaluation of multiple digests at once

Author:

bbpennel

Constructor Summary

Constructors

Constructor	Description
MultiDigestInputStreamWrapper(InputStream sourceStream, Collection<URI> digests, Collection<DigestAlgorithm> wantDigests)	Construct a MultiDigestInputStreamWrapper

Method Summary

Modifier and Type	Method	Description
void	checkFixity()	After consuming the inputstream, verify that all of the computed digests matched the provided digests.
String	getDigest(DigestAlgorithm alg)	Get the digest calculated for the provided algorithm
List<URI>	getDigests()	Returns the list of digests calculated for the wrapped InputStream Note: the wrapped InputStream will be consumed if it has not already been read.
InputStream	getInputStream()	Get the InputStream wrapped to produce the requested digests

Methods inherited from class java.lang.Object

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

Constructor Detail

MultiDigestInputStreamWrapper

public MultiDigestInputStreamWrapper(InputStream sourceStream,
                                     Collection<URI> digests,
                                     Collection<DigestAlgorithm> wantDigests)

Construct a MultiDigestInputStreamWrapper

Parameters:

sourceStream - the original source input stream

digests - collection of digests for the input stream

wantDigests - list of additional digest algorithms to compute for the input stream

Method Detail

getInputStream

public InputStream getInputStream()

Get the InputStream wrapped to produce the requested digests

Returns:

wrapped input stream

checkFixity

public void checkFixity()
                 throws InvalidChecksumException

After consuming the inputstream, verify that all of the computed digests matched the provided digests. Note: the wrapped InputStream will be consumed if it has not already been read.

Throws:

InvalidChecksumException - thrown if any of the digests did not match

getDigests

public List<URI> getDigests()

Returns the list of digests calculated for the wrapped InputStream Note: the wrapped InputStream will be consumed if it has not already been read.

Returns:

list of digests calculated from the wrapped InputStream, in URN format.

getDigest

public String getDigest(DigestAlgorithm alg)

Get the digest calculated for the provided algorithm

Parameters:

alg - algorithm of the digest to retrieve

Returns:

the calculated digest, or null if no digest of that type was calculated