org.h2.store

Class LobStorageFrontend

java.lang.Object

org.h2.store.LobStorageFrontend

All Implemented Interfaces:

LobStorageInterface

public class LobStorageFrontend
extends java.lang.Object
implements LobStorageInterface

This factory creates in-memory objects and temporary files. It is used on the client side.

Field Summary

Fields

Modifier and Type	Field and Description
static int	TABLE_ID_SESSION_VARIABLE The table id for session variables (LOBs not assigned to a table).
static int	TABLE_RESULT The table id for result sets.
static int	TABLE_TEMP The table id for temporary objects (not assigned to any object).

Constructor Summary

Constructors

Constructor and Description
LobStorageFrontend(DataHandler handler)

Method Summary

Modifier and Type	Method and Description
ValueLobDb	copyLob(ValueLobDb old, int tableId, long length) Copy a lob.
Value	createBlob(java.io.InputStream in, long maxLength) Create a BLOB object.
Value	createClob(java.io.Reader reader, long maxLength) Create a CLOB object.
java.io.InputStream	getInputStream(ValueLobDb lob, byte[] hmac, long byteCount) Get the input stream for the given lob.
void	init() Initialize the lob storage.
boolean	isReadOnly() Whether the storage is read-only
void	removeAllForTable(int tableId) Remove all LOBs for this table.
void	removeLob(ValueLobDb lob) Delete a LOB (from the database, if it is stored there).

Methods inherited from class java.lang.Object

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

Field Detail

TABLE_ID_SESSION_VARIABLE

public static final int TABLE_ID_SESSION_VARIABLE

The table id for session variables (LOBs not assigned to a table).

See Also:

Constant Field Values

TABLE_TEMP

public static final int TABLE_TEMP

The table id for temporary objects (not assigned to any object).

See Also:

Constant Field Values

TABLE_RESULT

public static final int TABLE_RESULT

The table id for result sets.

See Also:

Constant Field Values

Constructor Detail

LobStorageFrontend

public LobStorageFrontend(DataHandler handler)

Method Detail

removeLob

public void removeLob(ValueLobDb lob)

Description copied from interface: LobStorageInterface

Delete a LOB (from the database, if it is stored there).

Specified by:

removeLob in interface LobStorageInterface

Parameters:

lob - the lob

getInputStream

public java.io.InputStream getInputStream(ValueLobDb lob,
                                          byte[] hmac,
                                          long byteCount)
                                   throws java.io.IOException

Get the input stream for the given lob.

Specified by:

getInputStream in interface LobStorageInterface

Parameters:

lob - the lob

hmac - the message authentication code (for remote input streams)

byteCount - the number of bytes to read, or -1 if not known

Returns:

the stream

Throws:

java.io.IOException

isReadOnly

public boolean isReadOnly()

Description copied from interface: LobStorageInterface

Whether the storage is read-only

Specified by:

isReadOnly in interface LobStorageInterface

Returns:

true if yes

copyLob

public ValueLobDb copyLob(ValueLobDb old,
                          int tableId,
                          long length)

Description copied from interface: LobStorageInterface

Copy a lob.

Specified by:

copyLob in interface LobStorageInterface

Parameters:

old - the old lob

tableId - the new table id

length - the length

Returns:

the new lob

removeAllForTable

public void removeAllForTable(int tableId)

Description copied from interface: LobStorageInterface

Remove all LOBs for this table.

Specified by:

removeAllForTable in interface LobStorageInterface

Parameters:

tableId - the table id

createBlob

public Value createBlob(java.io.InputStream in,
                        long maxLength)

Description copied from interface: LobStorageInterface

Create a BLOB object.

Specified by:

createBlob in interface LobStorageInterface

Parameters:

in - the input stream

maxLength - the maximum length (-1 if not known)

Returns:

the LOB

createClob

public Value createClob(java.io.Reader reader,
                        long maxLength)

Create a CLOB object.

Specified by:

createClob in interface LobStorageInterface

Parameters:

reader - the reader

maxLength - the maximum length (-1 if not known)

Returns:

the LOB

init

public void init()

Description copied from interface: LobStorageInterface

Initialize the lob storage.

Specified by:

init in interface LobStorageInterface