Package org.h2.value.lob

Class LobDataFetchOnDemand

java.lang.Object

org.h2.value.lob.LobData

org.h2.value.lob.LobDataFetchOnDemand

public final class LobDataFetchOnDemand
extends LobData

A implementation of the LOB data used on the client side of a remote H2 connection. Fetches the underlying on data from the server.

Field Summary

Fields

Modifier and Type	Field	Description
private SessionRemote	handler
protected byte[]	hmac	If this is a client-side ValueLobDb object returned by a ResultSet, the hmac acts a security cookie that the client can send back to the server to ask for data related to this LOB.
private long	lobId
private int	tableId	If the LOB is managed by the one the LobStorageBackend classes, these are the unique key inside that storage.

Constructor Summary

Constructors

Constructor	Description
LobDataFetchOnDemand(DataHandler handler, int tableId, long lobId, byte[] hmac)

Method Summary

Modifier and Type	Method	Description
DataHandler	getDataHandler()
java.io.InputStream	getInputStream(long precision)	Get stream to read LOB data from
long	getLobId()
int	getTableId()	Get the current table id of this lob.
boolean	isLinkedToTable()	Check if this value is linked to a specific table.
java.lang.String	toString()

Methods inherited from class org.h2.value.lob.LobData

getMemory, remove

Methods inherited from class java.lang.Object

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

Field Detail

handler

private SessionRemote handler

tableId

private final int tableId

If the LOB is managed by the one the LobStorageBackend classes, these are the unique key inside that storage.

lobId

private final long lobId

hmac

protected final byte[] hmac

If this is a client-side ValueLobDb object returned by a ResultSet, the hmac acts a security cookie that the client can send back to the server to ask for data related to this LOB.

Constructor Detail

LobDataFetchOnDemand

public LobDataFetchOnDemand(DataHandler handler,
                            int tableId,
                            long lobId,
                            byte[] hmac)

Method Detail

isLinkedToTable

public boolean isLinkedToTable()

Check if this value is linked to a specific table. For values that are kept fully in memory, this method returns false.

Overrides:

isLinkedToTable in class LobData

Returns:

true if it is

getTableId

public int getTableId()

Get the current table id of this lob.

Returns:

the table id

getLobId

public long getLobId()

getInputStream

public java.io.InputStream getInputStream(long precision)

Description copied from class: LobData

Get stream to read LOB data from

Specified by:

getInputStream in class LobData

Parameters:

precision - octet length of the stream, or -1 if unknown

Returns:

stream to read LOB data from

getDataHandler

public DataHandler getDataHandler()

Overrides:

getDataHandler in class LobData

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object