org.dspace.checker
Class BitstreamInfoDAO

java.lang.Object
  org.dspace.checker.DAOSupport
      org.dspace.checker.BitstreamInfoDAO

public final class BitstreamInfoDAO
extends DAOSupport

Database Access Object for bitstream information (metadata). Also performs the needed insert/update/delete commands on the database for the checksum checker.

Author:

Jim Downing, Grace Carpenter, Nathan Sarr

Field Summary

static String	GET_OLDEST_BITSTREAM This selects the next bitstream in order of last processing end date.
static String	GET_OLDEST_BITSTREAM_DATE Selects the next bitstream in order of last processing end date, ensuring that no bitstream is checked more than once since the date parameter used.
static String	GET_OLDEST_BITSTREAM_DATE_ORACLE
static String	GET_OLDEST_BITSTREAM_ORACLE
static int	SENTINEL This value should be returned by next() to indicate that there are no more values.

Constructor Summary

BitstreamInfoDAO()
Default constructor

Method Summary

protected int	deleteBitstreamInfo(int id, Connection conn) Deletes the bitstream from the most_recent_checksum table if it exist.
int	deleteBitstreamInfoWithHistory(int id)
BitstreamInfo	findByBitstreamId(int id) Find a bitstream by its id.
List<Integer>	getCollectionBitstreams(int collectionId) Get the bitstream ids for a given collection
List<Integer>	getCommunityBitstreams(int communityId) Get the bitstream ids for a given community
List<Integer>	getItemBitstreams(int itemId) Get the bitstream ids for a given Item
int	getOldestBitstream() Get the oldest bitstream in the most recent checksum table.
int	getOldestBitstream(Timestamp lessThanDate) Returns the oldest bistream that in the set of bitstreams that are less than the specified date.
void	update(BitstreamInfo info) Updates most_recent_checksum with latest checksum and result of comparison with previous checksum.
void	updateMissingBitstreams() Queries the bitstream table for bitstream IDs that are not yet in the most_recent_checksum table, and inserts them into the most_recent_checksum and checksum_history tables.

Methods inherited from class org.dspace.checker.DAOSupport

cleanup, cleanup, cleanup, cleanup

Methods inherited from class java.lang.Object

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

Field Detail

SENTINEL

public static final int SENTINEL

This value should be returned by next() to indicate that there are no more values.

See Also:

Constant Field Values

GET_OLDEST_BITSTREAM

public static final String GET_OLDEST_BITSTREAM

This selects the next bitstream in order of last processing end date. The timestamp is truncated to milliseconds this is because the Date for java does not support nanoseconds and milliseconds were considered accurate enough

See Also:

Constant Field Values

GET_OLDEST_BITSTREAM_ORACLE

public static final String GET_OLDEST_BITSTREAM_ORACLE

See Also:

Constant Field Values

GET_OLDEST_BITSTREAM_DATE

public static final String GET_OLDEST_BITSTREAM_DATE

Selects the next bitstream in order of last processing end date, ensuring that no bitstream is checked more than once since the date parameter used.

See Also:

Constant Field Values

GET_OLDEST_BITSTREAM_DATE_ORACLE

public static final String GET_OLDEST_BITSTREAM_DATE_ORACLE

See Also:

Constant Field Values

Constructor Detail

BitstreamInfoDAO

public BitstreamInfoDAO()

Default constructor

Method Detail

update

public void update(BitstreamInfo info)

Updates most_recent_checksum with latest checksum and result of comparison with previous checksum.

Parameters:

info - The BitstreamInfo to update.

Throws:

IllegalArgumentException - if the BitstreamInfo given is null.

findByBitstreamId

public BitstreamInfo findByBitstreamId(int id)

Find a bitstream by its id.

Parameters:

id - the bitstream id

Returns:

the bitstream information needed for checksum validation. Returns null if bitstream info isn't found.

updateMissingBitstreams

public void updateMissingBitstreams()

Queries the bitstream table for bitstream IDs that are not yet in the most_recent_checksum table, and inserts them into the most_recent_checksum and checksum_history tables.

deleteBitstreamInfo

protected int deleteBitstreamInfo(int id,
                                  Connection conn)

Deletes the bitstream from the most_recent_checksum table if it exist.

Parameters:

id - the bitstream id.

Returns:

number of records deleted

deleteBitstreamInfoWithHistory

public int deleteBitstreamInfoWithHistory(int id)

getOldestBitstream

public int getOldestBitstream()

Get the oldest bitstream in the most recent checksum table. If more than one found the first one in the result set is returned.

Returns:

the bitstream id or -1 if the no bitstreams are found

getOldestBitstream

public int getOldestBitstream(Timestamp lessThanDate)

Returns the oldest bistream that in the set of bitstreams that are less than the specified date. If no bitstreams are found -1 is returned.

Parameters:

lessThanDate -

Returns:

id of olded bitstream or -1 if not bistreams are found

getItemBitstreams

public List<Integer> getItemBitstreams(int itemId)

Get the bitstream ids for a given Item

Parameters:

itemId -

Returns:

the list of bitstream ids for this item

getCollectionBitstreams

public List<Integer> getCollectionBitstreams(int collectionId)

Get the bitstream ids for a given collection

Parameters:

collectionId - The id of the collection

Returns:

the list of bitstream ids for this item

getCommunityBitstreams

public List<Integer> getCommunityBitstreams(int communityId)

Get the bitstream ids for a given community

Parameters:

communityId - the community id

Returns:

the list of bitstream ids for this item