com.googlecode.fascinator.common.harvester.impl
Class GenericHarvester

java.lang.Object
  com.googlecode.fascinator.common.harvester.impl.GenericHarvester

All Implemented Interfaces:

Harvester, Plugin

public abstract class GenericHarvester
extends Object
implements Harvester

Generic Harvester implementation that provides common functionality for subclasses.

Author:

Oliver Lucido

Constructor Summary

GenericHarvester(String id, String name)
Constructor

Method Summary

Set<String>	getDeletedObjectIdList() Gets a list of deleted digital object IDs.
String	getId() Gets an identifier for Harvester plugin
JsonSimpleConfig	getJsonConfig() Get config file
String	getName() Get a name for Harvester plugin
Set<String>	getObjectId(File uploadedFile) Get an individual uploaded file as a digital object.
PluginDescription	getPluginDetails() Gets a PluginDescription object relating to this plugin.
Storage	getStorage() Get storage instance that the Harvester will use to manage objects.
boolean	hasMoreDeletedObjects() Tests whether there are more objects to retrieve.
abstract void	init() Abstract method for Harvester plugin
void	init(File jsonFile) Initialises the plugin using the specified JSON configuration
void	init(String jsonString) Initialises the plugin using the specified JSON String
void	setStorage(Storage storage) Sets the Storage instance that the Harvester will use to manage objects.
void	shutdown() Shuts down the plugin

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.googlecode.fascinator.api.harvester.Harvester

getObjectIdList, hasMoreObjects

Constructor Detail

GenericHarvester

public GenericHarvester(String id,
                        String name)

Constructor

Parameters:

id - Harvester Id

name - Harvester Name

Method Detail

getObjectId

public Set<String> getObjectId(File uploadedFile)
                        throws HarvesterException

Get an individual uploaded file as a digital object. For consistency this should be in a list.

Specified by:

getObjectId in interface Harvester

Returns:

a list of one object ID

Throws:

HarvesterException - if there was an error retrieving the objects

getDeletedObjectIdList

public Set<String> getDeletedObjectIdList()
                                   throws HarvesterException

Gets a list of deleted digital object IDs. If there are no deleted objects, this method should return an empty list, not null.

Specified by:

getDeletedObjectIdList in interface Harvester

Returns:

a list of objects IDs, possibly empty

Throws:

HarvesterException - if there was an error retrieving the objects

hasMoreDeletedObjects

public boolean hasMoreDeletedObjects()

Tests whether there are more objects to retrieve. This method should return true if called before getObjects.

Specified by:

hasMoreDeletedObjects in interface Harvester

Returns:

true if there are more objects to retrieve, false otherwise

getStorage

public Storage getStorage()
                   throws HarvesterException

Get storage instance that the Harvester will use to manage objects.

Returns:

storage instance

Throws:

HarvesterException - if storage plugin is not set

setStorage

public void setStorage(Storage storage)

Sets the Storage instance that the Harvester will use to manage objects.

Specified by:

setStorage in interface Harvester

Parameters:

storage - a storage instance

getId

public String getId()

Gets an identifier for Harvester plugin

Specified by:

getId in interface Plugin

Returns:

the plugin type id

getName

public String getName()

Get a name for Harvester plugin

Specified by:

getName in interface Plugin

Returns:

the plugin name

getPluginDetails

public PluginDescription getPluginDetails()

Gets a PluginDescription object relating to this plugin.

Specified by:

getPluginDetails in interface Plugin

Returns:

a PluginDescription

init

public void init(File jsonFile)
          throws PluginException

Initialises the plugin using the specified JSON configuration

Specified by:

init in interface Plugin

Parameters:

jsonFile - JSON configuration file

Throws:

PluginException - if there was an error during initialisation

init

public void init(String jsonString)
          throws PluginException

Initialises the plugin using the specified JSON String

Specified by:

init in interface Plugin

Parameters:

jsonFile - JSON configuration file

Throws:

PluginException - if there was an error during initialisation

init

public abstract void init()
                   throws HarvesterException

Abstract method for Harvester plugin

Throws:

HarvesterException - if there was an error during initialisation

shutdown

public void shutdown()
              throws PluginException

Shuts down the plugin

Specified by:

shutdown in interface Plugin

Throws:

PluginException - if there was an error during shutdown

getJsonConfig

public JsonSimpleConfig getJsonConfig()
                               throws HarvesterException

Get config file

Returns:

config file

Throws:

HarvesterException - if there was an error during retrieval