org.apache.ojb.odmg
Class DatabaseImpl

java.lang.Object
  org.apache.ojb.odmg.DatabaseImpl

All Implemented Interfaces:

Database

public class DatabaseImpl
extends Object
implements Database

Implementation class of the Database interface.

Version:

$Id: DatabaseImpl.java,v 1.1 2007-08-24 22:17:37 ewestfal Exp $

Author:

Thomas Mahler, Matthew Baird, Armin Waibel

Field Summary

private boolean	isOpen
private Logger	log
private ImplementationImpl	odmg
private PBKey	pbKey

Fields inherited from interface org.odmg.Database

NOT_OPEN, OPEN_EXCLUSIVE, OPEN_READ_ONLY, OPEN_READ_WRITE

Constructor Summary

DatabaseImpl(ImplementationImpl ojb)

Method Summary

void	bind(Object object, String name) Associate a name with an object and make it persistent.
void	close() Close the database.
void	deletePersistent(Object object) Deletes an object from the database.
PBKey	getPBKey() Return the PBKey associated with this Database.
private TransactionImpl	getTransaction()
boolean	isOpen()
Object	lookup(String name) Lookup an object via its name.
void	makePersistent(Object object) Make a transient object durable in the database.
void	open(String name, int accessMode) Open the named database with the specified access mode.
void	unbind(String name) Disassociate a name with an object

Methods inherited from class java.lang.Object

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

Field Detail

log

private Logger log

pbKey

private PBKey pbKey

isOpen

private boolean isOpen

odmg

private ImplementationImpl odmg

Constructor Detail

DatabaseImpl

public DatabaseImpl(ImplementationImpl ojb)

Method Detail

getTransaction

private TransactionImpl getTransaction()

getPBKey

public PBKey getPBKey()

Return the PBKey associated with this Database.

isOpen

public boolean isOpen()

open

public void open(String name,
                 int accessMode)
          throws ODMGException

Open the named database with the specified access mode. Attempts to open a database when it has already been opened will result in the throwing of the exception DatabaseOpenException. A DatabaseNotFoundException is thrown if the database does not exist. Some implementations may throw additional exceptions that are also derived from ODMGException.

Specified by:

open in interface Database

Parameters:

name - The name of the database.

accessMode - The access mode, which should be one of the static fields: OPEN_READ_ONLY, OPEN_READ_WRITE, or OPEN_EXCLUSIVE.

Throws:

ODMGException - The database could not be opened.

close

public void close()
           throws ODMGException

Close the database. After you have closed a database, further attempts to access objects in the database will cause the exception DatabaseClosedException to be thrown. Some implementations may throw additional exceptions that are also derived from ODMGException.

Specified by:

close in interface Database

Throws:

ODMGException - Unable to close the database.

bind

public void bind(Object object,
                 String name)
          throws ObjectNameNotUniqueException

Associate a name with an object and make it persistent. An object instance may be bound to more than one name. Binding a previously transient object to a name makes that object persistent.

Specified by:

bind in interface Database

Parameters:

object - The object to be named.

name - The name to be given to the object.

Throws:

ObjectNameNotUniqueException - If an attempt is made to bind a name to an object and that name is already bound to an object.

lookup

public Object lookup(String name)
              throws ObjectNameNotFoundException

Lookup an object via its name.

Specified by:

lookup in interface Database

Parameters:

name - The name of an object.

Returns:

The object with that name.

Throws:

ObjectNameNotFoundException - There is no object with the specified name. ObjectNameNotFoundException

See Also:

ObjectNameNotFoundException

unbind

public void unbind(String name)
            throws ObjectNameNotFoundException

Disassociate a name with an object

Specified by:

unbind in interface Database

Parameters:

name - The name of an object.

Throws:

ObjectNameNotFoundException - No object exists in the database with that name.

makePersistent

public void makePersistent(Object object)

Make a transient object durable in the database. It must be executed in the context of an open transaction. If the transaction in which this method is executed commits, then the object is made durable. If the transaction aborts, then the makePersistent operation is considered not to have been executed, and the target object is again transient. ClassNotPersistenceCapableException is thrown if the implementation cannot make the object persistent because of the type of the object.

Specified by:

makePersistent in interface Database

Parameters:

object - The object to make persistent.

Throws:

TransactionNotInProgressException - if there is no current transaction.

deletePersistent

public void deletePersistent(Object object)

Deletes an object from the database. It must be executed in the context of an open transaction. If the object is not persistent, then ObjectNotPersistent is thrown. If the transaction in which this method is executed commits, then the object is removed from the database. If the transaction aborts, then the deletePersistent operation is considered not to have been executed, and the target object is again in the database.

Specified by:

deletePersistent in interface Database

Parameters:

object - The object to delete.