Package dk.netarkivet.harvester.datamodel.extendedfield

Class ExtendedFieldDAO

java.lang.Object

dk.netarkivet.harvester.datamodel.extendedfield.ExtendedFieldDAO

All Implemented Interfaces:

DAO

Direct Known Subclasses:

ExtendedFieldDBDAO

public abstract class ExtendedFieldDAO
extends Object
implements DAO

Interface for creating and accessing extended fields in persistent storage.

Field Summary

Fields

Modifier and Type	Field	Description
protected static ExtendedFieldDAO	instance	The database singleton model.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ExtendedFieldDAO()	constructor used when creating singleton.

Method Summary

Modifier and Type	Method	Description
abstract void	create(ExtendedField aExtendedField)	Creates an instance in persistent storage of the given extended Field.
abstract void	delete(long aExtendedFieldID)	deletes an ExtendedField from persistent storage.
abstract boolean	exists(Long aExtendedfieldId)	Check if an extendedfield exists for a given ID.
abstract List<ExtendedField>	getAll(long aExtendedFieldTypeId)	Return a list of all ExtendedFields of the given Extended Field Type.
static ExtendedFieldDAO	getInstance()
abstract ExtendedField	read(Long aExtendedFieldID)	Reads an ExtendedField from persistent storage.
static void	reset()	Reset the DAO instance.
abstract void	update(ExtendedField aExtendedField)	Update a ExtendedField in persistent storage.

Methods inherited from class java.lang.Object

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

Field Detail

instance

protected static ExtendedFieldDAO instance

The database singleton model.

Constructor Detail

ExtendedFieldDAO

protected ExtendedFieldDAO()

constructor used when creating singleton. Do not call directly.

Method Detail

reset

public static void reset()

Reset the DAO instance. Only for use from within tests.

exists

public abstract boolean exists(Long aExtendedfieldId)

Check if an extendedfield exists for a given ID.

Parameters:

aExtendedfieldId - a given ID.

Returns:

true, if an extendedfield exists for the given ID

create

public abstract void create(ExtendedField aExtendedField)

Creates an instance in persistent storage of the given extended Field.

Parameters:

aExtendedField - a ExtendedField to create in persistent storage.

read

public abstract ExtendedField read(Long aExtendedFieldID)
                            throws ArgumentNotValid,
                                   UnknownID,
                                   IOFailure

Reads an ExtendedField from persistent storage.

Parameters:

aExtendedFieldID - The ID of the ExtendedField to read

Returns:

a ExtendedField instance

Throws:

ArgumentNotValid - If failed to create ExtendedField instance in case aExtendedFieldID is invalid

UnknownID - If the job with the given jobID does not exist in persistent storage.

IOFailure - If the loaded ID of ExtendedField does not match the expected.

update

public abstract void update(ExtendedField aExtendedField)
                     throws IOFailure

Update a ExtendedField in persistent storage.

Parameters:

aExtendedField - The ExtendedField to update

Throws:

IOFailure - If writing the ExtendedField to persistent storage fails

getAll

public abstract List<ExtendedField> getAll(long aExtendedFieldTypeId)

Return a list of all ExtendedFields of the given Extended Field Type.

Parameters:

aExtendedFieldTypeId - extended field type.

Returns:

A list of all ExtendedFields with given Extended Field Type

delete

public abstract void delete(long aExtendedFieldID)
                     throws IOFailure

deletes an ExtendedField from persistent storage. The implementation of this method must also delete all belonging extended field values.

Parameters:

aExtendedFieldID - The ID of the ExtendedField to read

Throws:

IOFailure - If deleting the ExtendedField fails

getInstance

public static ExtendedFieldDAO getInstance()

Returns:

an instance of this class.