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java.lang.Objectdk.netarkivet.harvester.datamodel.extendedfield.ExtendedFieldDAO
public abstract class ExtendedFieldDAO
Interface for creating and accessing extended fields in persistent storage.
Field Summary | |
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protected static ExtendedFieldDAO |
instance
The database singleton model. |
Constructor Summary | |
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protected |
ExtendedFieldDAO()
constructor used when creating singleton. |
Method Summary | |
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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(java.lang.Long aExtendedfieldId)
Check if an extendedfield exists for a given ID. |
abstract java.util.List<ExtendedField> |
getAll(long aExtendedFieldTypeId)
Return a list of all ExtendedFields of the given Extended Field Type. |
static ExtendedFieldDAO |
getInstance()
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abstract ExtendedField |
read(java.lang.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 |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected static ExtendedFieldDAO instance
Constructor Detail |
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protected ExtendedFieldDAO()
Method Detail |
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public static void reset()
public abstract boolean exists(java.lang.Long aExtendedfieldId)
aExtendedfieldId
- a given ID.
public abstract void create(ExtendedField aExtendedField)
aExtendedField
- a ExtendedField to create in persistent storage.public abstract ExtendedField read(java.lang.Long aExtendedFieldID) throws ArgumentNotValid, UnknownID, IOFailure
aExtendedFieldID
- The ID of the ExtendedField to read
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.public abstract void update(ExtendedField aExtendedField) throws IOFailure
aExtendedField
- The ExtendedField to update
IOFailure
- If writing the ExtendedField to persistent
storage failspublic abstract java.util.List<ExtendedField> getAll(long aExtendedFieldTypeId)
aExtendedFieldTypeId
- extended field type.
public abstract void delete(long aExtendedFieldID) throws IOFailure
aExtendedFieldID
- The ID of the ExtendedField to read
IOFailure
- If deleting the ExtendedField failspublic static ExtendedFieldDAO getInstance()
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