gate
Interface DataStore

All Superinterfaces:
FeatureBearer, NameBearer
All Known Subinterfaces:
DatabaseDataStore
All Known Implementing Classes:
SerialDataStore

public interface DataStore
extends FeatureBearer, NameBearer

Models all sorts of data storage.


Field Summary
static String DATASTORE_FEATURE_NAME
           
static String LR_ID_FEATURE_NAME
           
 
Method Summary
 void addDatastoreListener(DatastoreListener l)
          Registers a new DatastoreListener with this datastore
 LanguageResource adopt(LanguageResource lr, SecurityInfo secInfo)
          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 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 getLrNames(String lrType)
          Get a list of the names of LRs of a particular type that are present.
 List getLrTypes()
          Get a list of the types of LR that are present in the data store.
 SecurityInfo getSecurityInfo(LanguageResource lr)
          get security information for LR .
 Session getSession(Session s)
          identify user using this datastore
 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 setSecurityInfo(LanguageResource lr, SecurityInfo si)
          set security information for LR .
 void setSession(Session s)
          identify user using this datastore
 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

public static final String DATASTORE_FEATURE_NAME

LR_ID_FEATURE_NAME

public static final String LR_ID_FEATURE_NAME
Method Detail

setStorageUrl

public void setStorageUrl(String storageUrl)
                   throws PersistenceException
Set the URL as string for the underlying storage mechanism.

getStorageUrl

public String getStorageUrl()
Get the URL as String for the underlying storage mechanism.

create

public 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.

open

public void open()
          throws PersistenceException
Open a connection to the data store.

close

public void close()
           throws PersistenceException
Close the data store.

delete

public 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.

delete

public 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

sync

public void sync(LanguageResource lr)
          throws PersistenceException,
                 SecurityException
Save: synchonise the in-memory image of the LR with the persistent image.

setAutoSaving

public 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.

isAutoSaving

public boolean isAutoSaving()
Get the autosaving behaviour of the LR.

adopt

public LanguageResource adopt(LanguageResource lr,
                              SecurityInfo secInfo)
                       throws PersistenceException,
                              SecurityException
Adopt a resource for persistence.

getLr

public LanguageResource getLr(String lrClassName,
                              Object lrId)
                       throws PersistenceException,
                              SecurityException
Get a resource from the persistent store. Don't use this method - use Factory.createResource with DataStore and DataStoreInstanceId parameters set instead.

getLrTypes

public List getLrTypes()
                throws PersistenceException
Get a list of the types of LR that are present in the data store.

getLrIds

public List getLrIds(String lrType)
              throws PersistenceException
Get a list of the IDs of LRs of a particular type that are present.

getLrNames

public List getLrNames(String lrType)
                throws PersistenceException
Get a list of the names of LRs of a particular type that are present.

findLrIds

public List findLrIds(List constraints)
               throws PersistenceException
Get a list of LRs that satisfy some set or restrictions

findLrIds

public 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

getLrName

public String getLrName(Object lrId)
                 throws PersistenceException
Get the name of an LR from its ID.

addDatastoreListener

public void addDatastoreListener(DatastoreListener l)
Registers a new DatastoreListener with this datastore

removeDatastoreListener

public void removeDatastoreListener(DatastoreListener l)
Removes a a previously registered DatastoreListener from the list listeners for this datastore

getIconName

public String getIconName()
Returns the name of the icon to be used when this datastore is displayed in the GUI

getComment

public String getComment()
Returns the comment displayed by the GUI for this DataStore

canReadLR

public boolean canReadLR(Object lrID)
                  throws PersistenceException,
                         SecurityException
Checks if the user (identified by the sessionID) has read access to the LR

canWriteLR

public boolean canWriteLR(Object lrID)
                   throws PersistenceException,
                          SecurityException
Checks if the user (identified by the sessionID) has write access to the LR

getSecurityInfo

public SecurityInfo getSecurityInfo(LanguageResource lr)
                             throws PersistenceException
get security information for LR .

setSecurityInfo

public void setSecurityInfo(LanguageResource lr,
                            SecurityInfo si)
                     throws PersistenceException,
                            SecurityException
set security information for LR .

setSession

public void setSession(Session s)
                throws SecurityException
identify user using this datastore

getSession

public Session getSession(Session s)
                   throws SecurityException
identify user using this datastore

lockLr

public 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

unlockLr

public void unlockLr(LanguageResource lr)
              throws PersistenceException,
                     SecurityException
Releases the exlusive lock on a resource from the persistent store.