com.db4o.io

Class StorageDecorator

java.lang.Object

com.db4o.io.StorageDecorator

All Implemented Interfaces:

Storage

Direct Known Subclasses:

CachingStorage, NonFlushingStorage

public class StorageDecorator
extends java.lang.Object
implements Storage

Wrapper base class for all classes that wrap Storage. Each class that adds functionality to a Storage must extend this class.

See Also:

BinDecorator

Field Summary

Fields

Modifier and Type	Field and Description
protected Storage	_storage

Constructor Summary

Constructors

Constructor and Description
StorageDecorator(Storage storage)

Method Summary

Methods

Modifier and Type	Method and Description
protected Bin	decorate(BinConfiguration config, Bin bin)
void	delete(java.lang.String uri) Deletes the bin for the given URI from the storage.
boolean	exists(java.lang.String uri) returns true if a Bin (file or memory) exists with the passed name.
Bin	open(BinConfiguration config) opens a Bin to store db4o database data.
void	rename(java.lang.String oldUri, java.lang.String newUri) Renames the bin for the given old URI to the new URI.

Methods inherited from class java.lang.Object

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

Field Detail

_storage

protected final Storage _storage

Constructor Detail

StorageDecorator

public StorageDecorator(Storage storage)

Method Detail

exists

public boolean exists(java.lang.String uri)

Description copied from interface: Storage

returns true if a Bin (file or memory) exists with the passed name.

Specified by:

exists in interface Storage

open

public Bin open(BinConfiguration config)
         throws Db4oIOException

Description copied from interface: Storage

opens a Bin to store db4o database data.

Specified by:

open in interface Storage

Throws:

Db4oIOException

decorate

protected Bin decorate(BinConfiguration config,
           Bin bin)

delete

public void delete(java.lang.String uri)
            throws java.io.IOException

Description copied from interface: Storage

Deletes the bin for the given URI from the storage.

Specified by:

delete in interface Storage

Parameters:

uri - bin URI

Throws:

java.io.IOException - if the bin could not be deleted

rename

public void rename(java.lang.String oldUri,
          java.lang.String newUri)
            throws java.io.IOException

Description copied from interface: Storage

Renames the bin for the given old URI to the new URI. If a bin for the new URI exists, it will be overwritten.

Specified by:

rename in interface Storage

Parameters:

oldUri - URI of the existing bin

newUri - future URI of the bin

Throws:

java.io.IOException - if the bin could not be deleted