DataStore (GATE Core 8.6.1 API)

All Superinterfaces:

FeatureBearer, NameBearer

All Known Subinterfaces:

SearchableDataStore

All Known Implementing Classes:

LuceneDataStoreImpl, SerialDataStore
```
public interface DataStore
extends FeatureBearer, NameBearer
```
Models all sorts of data storage.

Field Summary

Fields
Modifier and Type Field and Description

static String DATASTORE_FEATURE_NAME

static String LR_ID_FEATURE_NAME

Fields
Modifier and Type	Field and Description
`static String`	`DATASTORE_FEATURE_NAME`
`static String`	`LR_ID_FEATURE_NAME`

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`addDatastoreListener(DatastoreListener l)` Registers a new `DatastoreListener` with this datastore
`LanguageResource`	`adopt(LanguageResource lr)` Adopt a resource for persistence.
`boolean`	`canReadLR(Object lrID)` Checks if the user (identified by the sessionID) has read access to the LR
`boolean`	`canWriteLR(Object lrID)` Checks if the user (identified by the sessionID) has write access to the LR
`void`	`close()` Close the data store.
`void`	`create()` Create a new data store.
`void`	`delete()` Delete the data store.
`void`	`delete(String lrClassName, Object lrId)` Delete a resource from the data store.
`List`	`findLrIds(List constraints)` Get a list of LRs that satisfy some set or restrictions
`List`	`findLrIds(List constraints, String lrType)` Get a list of LRs that satisfy some set or restrictions and are of a particular type
`String`	`getComment()` Returns the comment displayed by the GUI for this DataStore
`String`	`getIconName()` Returns the name of the icon to be used when this datastore is displayed in the GUI
`LanguageResource`	`getLr(String lrClassName, Object lrId)` Get a resource from the persistent store.
`List<String>`	`getLrIds(String lrType)` Get a list of the IDs of LRs of a particular type that are present.
`String`	`getLrName(Object lrId)` Get the name of an LR from its ID.
`List<String>`	`getLrNames(String lrType)` Get a list of the names of LRs of a particular type that are present.
`List<String>`	`getLrTypes()` Get a list of the types of LR that are present in the data store.
`String`	`getStorageUrl()` Get the URL as String for the underlying storage mechanism.
`boolean`	`isAutoSaving()` Get the autosaving behaviour of the LR.
`boolean`	`lockLr(LanguageResource lr)` Try to acquire exlusive lock on a resource from the persistent store.
`void`	`open()` Open a connection to the data store.
`void`	`removeDatastoreListener(DatastoreListener l)` Removes a a previously registered `DatastoreListener` from the list listeners for this datastore
`void`	`setAutoSaving(boolean autoSaving)` Set method for the autosaving behaviour of the data store.
`void`	`setStorageUrl(String storageUrl)` Set the URL as string for the underlying storage mechanism.
`void`	`sync(LanguageResource lr)` Save: synchonise the in-memory image of the LR with the persistent image.
`void`	`unlockLr(LanguageResource lr)` Releases the exlusive lock on a resource from the persistent store.

Methods inherited from interface gate.util.FeatureBearer
getFeatures, setFeatures

Methods inherited from interface gate.util.NameBearer
getName, setName

- Field Detail
  - DATASTORE_FEATURE_NAME
```
static final String DATASTORE_FEATURE_NAME
```
    See Also:
    
    Constant Field Values
  - LR_ID_FEATURE_NAME
```
static final String LR_ID_FEATURE_NAME
```
    See Also:
    
    Constant Field Values
- Method Detail
  - setStorageUrl
```
void setStorageUrl(String storageUrl)
            throws PersistenceException
```
    Set the URL as string for the underlying storage mechanism.
    
    Throws:
    
    PersistenceException
  - getStorageUrl
```
String getStorageUrl()
```
    Get the URL as String for the underlying storage mechanism.
  - create
```
void create()
     throws PersistenceException,
            UnsupportedOperationException
```
    Create a new data store. NOTE: for some data stores creation is an system administrator task; in such cases this method will throw an UnsupportedOperationException.
    
    Throws:
    
    PersistenceException
    
    UnsupportedOperationException
  - open
```
void open()
   throws PersistenceException
```
    Open a connection to the data store.
    
    Throws:
    
    PersistenceException
  - close
```
void close()
    throws PersistenceException
```
    Close the data store.
    
    Throws:
    
    PersistenceException
  - delete
```
void delete()
     throws PersistenceException,
            UnsupportedOperationException
```
    Delete the data store. NOTE: for some data stores deletion is an system administrator task; in such cases this method will throw an UnsupportedOperationException.
    
    Throws:
    
    PersistenceException
    
    UnsupportedOperationException
  - delete
```
void delete(String lrClassName,
            Object lrId)
     throws PersistenceException,
            SecurityException
```
    Delete a resource from the data store.
    
    Parameters:
    
    lrId - a data-store specific unique identifier for the resource
    
    lrClassName - class name of the type of resource
    
    Throws:
    
    PersistenceException
    
    SecurityException
  - sync
```
void sync(LanguageResource lr)
   throws PersistenceException,
          SecurityException
```
    Save: synchonise the in-memory image of the LR with the persistent image.
    
    Throws:
    
    PersistenceException
    
    SecurityException
  - setAutoSaving
```
void setAutoSaving(boolean autoSaving)
            throws UnsupportedOperationException,
                   PersistenceException
```
    Set method for the autosaving behaviour of the data store. NOTE: many types of datastore have no auto-save function, in which case this will throw an UnsupportedOperationException.
    
    Throws:
    
    UnsupportedOperationException
    
    PersistenceException
  - isAutoSaving
```
boolean isAutoSaving()
```
    Get the autosaving behaviour of the LR.
  - adopt
```
LanguageResource adopt(LanguageResource lr)
                throws PersistenceException
```
    Adopt a resource for persistence.
    
    Throws:
    
    PersistenceException
  - getLr
```
LanguageResource getLr(String lrClassName,
                       Object lrId)
                throws PersistenceException,
                       SecurityException
```
    Get a resource from the persistent store. You should never call this method directly, instead use the following:
```
 FeatureMap params = Factory.newFeatureMap();
 params.put(DataStore.DATASTORE_FEATURE_NAME, datastore);
 params.put(DataStore.LR_ID_FEATURE_NAME, lrID);
 LanguageResource lr = (LanguageResource)Factory.createResource(lrClassName, params);
```
    Throws:
    
    PersistenceException
    
    SecurityException
  - getLrTypes
```
List<String> getLrTypes()
                 throws PersistenceException
```
    Get a list of the types of LR that are present in the data store.
    
    Throws:
    
    PersistenceException
  - getLrIds
```
List<String> getLrIds(String lrType)
               throws PersistenceException
```
    Get a list of the IDs of LRs of a particular type that are present.
    
    Throws:
    
    PersistenceException
  - getLrNames
```
List<String> getLrNames(String lrType)
                 throws PersistenceException
```
    Get a list of the names of LRs of a particular type that are present.
    
    Throws:
    
    PersistenceException
  - findLrIds
```
List findLrIds(List constraints)
        throws PersistenceException
```
    Get a list of LRs that satisfy some set or restrictions
    
    Throws:
    
    PersistenceException
  - findLrIds
```
List findLrIds(List constraints,
               String lrType)
        throws PersistenceException
```
    Get a list of LRs that satisfy some set or restrictions and are of a particular type
    
    Throws:
    
    PersistenceException
  - getLrName
```
String getLrName(Object lrId)
          throws PersistenceException
```
    Get the name of an LR from its ID.
    
    Throws:
    
    PersistenceException
  - addDatastoreListener
```
void addDatastoreListener(DatastoreListener l)
```
    Registers a new DatastoreListener with this datastore
  - removeDatastoreListener
```
void removeDatastoreListener(DatastoreListener l)
```
    Removes a a previously registered DatastoreListener from the list listeners for this datastore
  - getIconName
```
String getIconName()
```
    Returns the name of the icon to be used when this datastore is displayed in the GUI
  - getComment
```
String getComment()
```
    Returns the comment displayed by the GUI for this DataStore
  - canReadLR
```
boolean canReadLR(Object lrID)
           throws PersistenceException
```
    Checks if the user (identified by the sessionID) has read access to the LR
    
    Throws:
    
    PersistenceException
  - canWriteLR
```
boolean canWriteLR(Object lrID)
            throws PersistenceException
```
    Checks if the user (identified by the sessionID) has write access to the LR
    
    Throws:
    
    PersistenceException
  - lockLr
```
boolean lockLr(LanguageResource lr)
        throws PersistenceException,
               SecurityException
```
    Try to acquire exlusive lock on a resource from the persistent store. Always call unlockLR() when the lock is no longer needed
    
    Throws:
    
    PersistenceException
    
    SecurityException
  - unlockLr
```
void unlockLr(LanguageResource lr)
       throws PersistenceException,
              SecurityException
```
    Releases the exlusive lock on a resource from the persistent store.
    
    Throws:
    
    PersistenceException
    
    SecurityException

Interface DataStore

Field Summary

Method Summary

Methods inherited from interface gate.util.FeatureBearer

Methods inherited from interface gate.util.NameBearer

Field Detail

DATASTORE_FEATURE_NAME

LR_ID_FEATURE_NAME

Method Detail

setStorageUrl

getStorageUrl

create

open

close

delete

delete

sync

setAutoSaving

isAutoSaving

adopt

getLr

getLrTypes

getLrIds

getLrNames

findLrIds

findLrIds

getLrName

addDatastoreListener

removeDatastoreListener

getIconName

getComment

canReadLR

canWriteLR

lockLr

unlockLr