com.db4o.internal

Class BlobImpl

java.lang.Object

com.db4o.internal.BlobImpl

All Implemented Interfaces:

Db4oTypeImpl, TransactionAware, Blob, Db4oType, java.lang.Cloneable

public class BlobImpl
extends java.lang.Object
implements Blob, java.lang.Cloneable, Db4oTypeImpl

Transfer of blobs to and from the db4o system, if users use the Blob Db4oType.

Field Summary

Fields

Modifier and Type	Field and Description
static int	COPYBUFFER_LENGTH
java.lang.String	fileName
java.lang.String	i_ext
int	i_length

Constructor Summary

Constructors

Constructor and Description
BlobImpl()

Method Summary

Methods

Modifier and Type	Method and Description
int	adjustReadDepth(int depth)
java.lang.Object	createDefault(Transaction a_trans)
void	deleteFile() Deletes the current file stored in this BLOB.
java.io.FileInputStream	getClientInputStream()
java.io.FileOutputStream	getClientOutputStream()
java.lang.String	getFileName() returns the name of the file the blob was stored to.
int	getLength()
double	getStatus() returns the status after the last read- or write-operation.
void	getStatusFrom(BlobStatus from)
boolean	hasClassIndex()
void	readFrom(java.io.File file) reads a file into the db4o system and stores it as a blob.
void	readLocal(java.io.File file) reads a file into the db4o system and stores it as a blob.
java.io.File	serverFile(java.lang.String promptName, boolean writeToServer)
void	setObjectReference(ObjectReference objectReference)
void	setStatus(double status)
void	setTrans(Transaction a_trans)
void	writeLocal(java.io.File file) writes stored blob data to a file.
void	writeTo(java.io.File file) writes stored blob data to a file.

Methods inherited from class java.lang.Object

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

Field Detail

COPYBUFFER_LENGTH

public static final int COPYBUFFER_LENGTH

See Also:

Constant Field Values

fileName

public java.lang.String fileName

i_ext

public java.lang.String i_ext

i_length

public int i_length

Constructor Detail

BlobImpl

public BlobImpl()

Method Detail

adjustReadDepth

public int adjustReadDepth(int depth)

Parameters:

depth -

createDefault

public java.lang.Object createDefault(Transaction a_trans)

Specified by:

createDefault in interface Db4oTypeImpl

getClientInputStream

public java.io.FileInputStream getClientInputStream()
                                             throws java.lang.Exception

Throws:

java.lang.Exception

getClientOutputStream

public java.io.FileOutputStream getClientOutputStream()
                                               throws java.lang.Exception

Throws:

java.lang.Exception

getFileName

public java.lang.String getFileName()

Description copied from interface: Blob

returns the name of the file the blob was stored to.

The method may return null, if the file was never stored.

Specified by:

getFileName in interface Blob

Returns:

String the name of the file.

getLength

public int getLength()

getStatus

public double getStatus()

Description copied from interface: Blob

returns the status after the last read- or write-operation.

The status value returned may be any of the following:
Status.UNUSED no data was ever stored to the Blob field.
Status.AVAILABLE available data was previously stored to the Blob field.
Status.QUEUED an operation was triggered and is waiting for it's turn in the Blob queue.
Status.COMPLETED the last operation on this field was completed successfully.
Status.PROCESSING for internal use only.
Status.ERROR the last operation failed.
or a double between 0 and 1 that signifies the current completion percentage of the currently running operation.

the five Status constants defined in this interface or a double between 0 and 1 that signifies the completion of the currently running operation.

Specified by:

getStatus in interface Blob

Returns:

status - the current status

See Also:

constants

getStatusFrom

public void getStatusFrom(BlobStatus from)

hasClassIndex

public boolean hasClassIndex()

Specified by:

hasClassIndex in interface Db4oTypeImpl

readFrom

public void readFrom(java.io.File file)
              throws java.io.IOException

Description copied from interface: Blob

reads a file into the db4o system and stores it as a blob.

In Client/Server mode db4o will open an additional socket and process writing data in an additional thread.

Specified by:

readFrom in interface Blob

Parameters:

file - the file the blob is to be read from.

Throws:

java.io.IOException - in case of errors

readLocal

public void readLocal(java.io.File file)
               throws java.io.IOException

Description copied from interface: Blob

reads a file into the db4o system and stores it as a blob.

db4o will use the local file system in Client/Server mode also.

Specified by:

readLocal in interface Blob

Parameters:

file - the file the blob is to be read from.

Throws:

java.io.IOException - in case of errors

serverFile

public java.io.File serverFile(java.lang.String promptName,
                      boolean writeToServer)
                        throws java.io.IOException

Throws:

java.io.IOException

setStatus

public void setStatus(double status)

setTrans

public void setTrans(Transaction a_trans)

Specified by:

setTrans in interface TransactionAware

writeLocal

public void writeLocal(java.io.File file)
                throws java.io.IOException

Description copied from interface: Blob

writes stored blob data to a file.

db4o will use the local file system in Client/Server mode also.

Specified by:

writeLocal in interface Blob

Parameters:

file - the file the blob is to be written to.

Throws:

java.io.IOException - in case of errors and in case no blob data was stored

writeTo

public void writeTo(java.io.File file)
             throws java.io.IOException

Description copied from interface: Blob

writes stored blob data to a file.

In Client/Server mode db4o will open an additional socket and process writing data in an additional thread.

Specified by:

writeTo in interface Blob

Parameters:

file - the file the blob is to be written to.

Throws:

java.io.IOException - in case of errors and in case no blob data was stored

setObjectReference

public void setObjectReference(ObjectReference objectReference)

Specified by:

setObjectReference in interface Db4oTypeImpl

deleteFile

public void deleteFile()
                throws java.io.IOException

Description copied from interface: Blob

Deletes the current file stored in this BLOB.

Specified by:

deleteFile in interface Blob

Throws:

java.io.IOException - in case of errors and in case no data was stored