com.googlecode.fascinator.common.storage

Class StorageUtils

java.lang.Object

com.googlecode.fascinator.common.storage.StorageUtils

public class StorageUtils
extends Object

Storage API utility methods.

Author:

Oliver Lucido, Andrew Brazzatti, Jianfeng Li

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEFAULT_HOSTNAME Default host name

Constructor Summary

Constructors

Constructor and Description
StorageUtils()

Method Summary

Methods

Modifier and Type	Method and Description
static DigitalObject	checkHarvestFile(Storage storage, File file) Ensure the provided harvest file is up-to-date in storage.
static Payload	createLinkedPayload(DigitalObject object, String pid, String path) Creates a linked Payload in the specified DigitalObject
static Payload	createOrUpdatePayload(DigitalObject object, String pid, InputStream in) Create or update a stored Payload in the specified DigitalObject
static Payload	createOrUpdatePayload(DigitalObject object, String pid, InputStream in, String filePath)
static String	generateOid(File file) Generates a Object identifier for a given file
static String	generatePid(File file) Generates a Payload identifier for a given file
static DigitalObject	getDigitalObject(Storage storage, String oid) Gets a DigitalObject from the specified Storage instance.
static Payload	getPayload(Storage storage, String oid, String payloadName) Get a payload object in the specified Storage instance by its object ID and the name of payload
static DigitalObject	linkFile(Storage storage, File file) This method stores a link to a File as a DigitalObject into the specified Storage
static DigitalObject	storeFile(Storage storage, File file) This method stores a copy of a File as a DigitalObject into the specified Storage
static DigitalObject	storeFile(Storage storage, File file, boolean linked) This method stores a File as a DigitalObject into the specified Storage.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_HOSTNAME

public static final String DEFAULT_HOSTNAME

Default host name

See Also:

Constant Field Values

Constructor Detail

StorageUtils

public StorageUtils()

Method Detail

generateOid

public static String generateOid(File file)

Generates a Object identifier for a given file

Parameters:

file - the File to store

Returns:

a String object id

generatePid

public static String generatePid(File file)

Generates a Payload identifier for a given file

Parameters:

file - the File to store

Returns:

a String payload id

storeFile

public static DigitalObject storeFile(Storage storage,
                      File file)
                               throws StorageException

This method stores a copy of a File as a DigitalObject into the specified Storage

Parameters:

storage - a Storage instance

file - the File to store

Returns:

a DigitalObject

Throws:

StorageException - if there was an error storing the file

linkFile

public static DigitalObject linkFile(Storage storage,
                     File file)
                              throws StorageException

This method stores a link to a File as a DigitalObject into the specified Storage

Parameters:

storage - a Storage instance

file - the File to store

Returns:

a DigitalObject

Throws:

StorageException - if there was an error storing the file

storeFile

public static DigitalObject storeFile(Storage storage,
                      File file,
                      boolean linked)
                               throws StorageException

This method stores a File as a DigitalObject into the specified Storage. The File can be stored as a linked Payload if specified.

Parameters:

storage - a Storage instance

file - the File to store

linked - set true to link to the original file, false to copy

Returns:

a DigitalObject

Throws:

StorageException - if there was an error storing the file

getDigitalObject

public static DigitalObject getDigitalObject(Storage storage,
                             String oid)
                                      throws StorageException

Gets a DigitalObject from the specified Storage instance. If the object does not exist, this method will attempt to create it.

Parameters:

storage - a Storage instance

oid - the object identifier to get (or create)

Returns:

a DigitalObject

Throws:

StorageException - if the object could not be retrieved or created

getPayload

public static Payload getPayload(Storage storage,
                 String oid,
                 String payloadName)
                          throws StorageException

Get a payload object in the specified Storage instance by its object ID and the name of payload

Parameters:

storage - : Storage object

oid - : ID of a Digital object

payloadName - : name of payload

Returns:

a Payload object

Throws:

StorageException

checkHarvestFile

public static DigitalObject checkHarvestFile(Storage storage,
                             File file)
                                      throws StorageException

Ensure the provided harvest file is up-to-date in storage.

Parameters:

storage - a Storage instance

file - to check in storage

Returns:

a DigitalObject

Throws:

StorageException - if the object could not be retrieved or created

createOrUpdatePayload

public static Payload createOrUpdatePayload(DigitalObject object,
                            String pid,
                            InputStream in)
                                     throws StorageException

Create or update a stored Payload in the specified DigitalObject

Parameters:

object - the DigitalObject to create the Payload in

pid - the Payload ID

in - the InputStream for the Payload's data

Returns:

a Payload

Throws:

StorageException - if the Payload could not be created

createOrUpdatePayload

public static Payload createOrUpdatePayload(DigitalObject object,
                            String pid,
                            InputStream in,
                            String filePath)
                                     throws StorageException

Throws:

StorageException

createLinkedPayload

public static Payload createLinkedPayload(DigitalObject object,
                          String pid,
                          String path)
                                   throws StorageException

Creates a linked Payload in the specified DigitalObject

Parameters:

object - the DigitalObject to create the Payload in

pid - the Payload ID

path - the absolute path to the file the Payload links to

Returns:

a Payload

Throws:

StorageException - if the Payload could not be created