org.vrspace.neurogrid
Class DBAdapter

java.lang.Object
  org.vrspace.neurogrid.DBAdapter

Direct Known Subclasses:

MapDB

public abstract class DBAdapter

extends java.lang.Object

Database adapter. Some methods common for all subclasses should be implemented here.

Field Summary

protected static DBAdapter

instance

Constructor Summary

DBAdapter()

Method Summary

abstract int	count(java.lang.Class what) Count instances of a class
abstract void	delete(NGObject obj) Guess what;)
abstract NGObject	get(java.lang.Class what, long id) Reload an object from the storage
abstract NGObject	get(java.lang.Class what, NGObject value) The same as subSet( What, value, value.next );
static DBAdapter	getInstance() Get the instance of current database adapter
abstract void	init(Store store) Initialize the adapter
abstract java.util.Iterator	iterator(java.lang.Class what) Returns iterator on all instances of a class
abstract void	put(NGObject obj) Store an object to the database
abstract long	size() Total number of rows in the database
abstract java.util.SortedSet	subSet(java.lang.Class what, java.lang.Object start, java.lang.Object end) Return subset of a class

Methods inherited from class java.lang.Object

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

Field Detail

instance

protected static DBAdapter instance

Constructor Detail

DBAdapter

public DBAdapter()

Method Detail

init

public abstract void init(Store store)
                   throws java.lang.Exception

Initialize the adapter

Throws:

java.lang.Exception

See Also:

Store

getInstance

public static DBAdapter getInstance()

Get the instance of current database adapter

put

public abstract void put(NGObject obj)
                  throws java.lang.Exception

Store an object to the database

Throws:

java.lang.Exception

count

public abstract int count(java.lang.Class what)

Count instances of a class

iterator

public abstract java.util.Iterator iterator(java.lang.Class what)

Returns iterator on all instances of a class

subSet

public abstract java.util.SortedSet subSet(java.lang.Class what,
                                           java.lang.Object start,
                                           java.lang.Object end)

Return subset of a class

get

public abstract NGObject get(java.lang.Class what,
                             long id)

Reload an object from the storage

get

public abstract NGObject get(java.lang.Class what,
                             NGObject value)

The same as subSet( What, value, value.next );

delete

public abstract void delete(NGObject obj)
                     throws java.lang.Exception

Guess what;)

Throws:

java.lang.Exception

size

public abstract long size()

Total number of rows in the database