Class ImportLobFile

java.lang.Object

org.apache.derby.impl.load.ImportLobFile

class ImportLobFile
extends Object

Helper class to read large object data at random locations from a file that contains large object data.

Field Summary

Fields

Modifier and Type	Field	Description
private String	dataCodeset
private ImportFileInputStream	lobInputStream
private LimitInputStream	lobLimitIn
private Reader	lobReader

Constructor Summary

Constructors

Constructor	Description
ImportLobFile(File lobFile, String dataCodeset)	Create a ImportLobFile object.

Method Summary

Modifier and Type	Method	Description
void	close()	Close all the resources realated to the lob file.
InputStream	getBinaryStream(long offset, long length)	Returns a stream that points to the lob data from file at the given offset.
Reader	getCharacterStream(long offset, long length)	Returns a stream that points to the clob data from file at the given offset.
long	getClobDataLength(long offset, long length)	Returns the clob data length in characters at the give location.
String	getString(long offset, int length)	Returns the clob data at the given location as String.
private void	openLobFile(File lobFile)	Open the lob file and setup the stream required to read the data.

Methods inherited from class Object

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

Field Details

lobInputStream

private ImportFileInputStream lobInputStream

lobLimitIn

private LimitInputStream lobLimitIn

lobReader

private Reader lobReader

dataCodeset

private String dataCodeset

Constructor Details

ImportLobFile

ImportLobFile(File lobFile,
 String dataCodeset)
       throws Exception

Create a ImportLobFile object.

Parameters:

lobFile - the file which has the LOB Data.

dataCodeset - the code set to use char data in the file.

Throws:

Exception

Method Details

openLobFile

private void openLobFile(File lobFile)
                  throws Exception

Open the lob file and setup the stream required to read the data.

Parameters:

lobFile - the file that contains lob data.

Throws:

Exception - if an error occurs.

getBinaryStream

public InputStream getBinaryStream(long offset,
 long length)
                            throws IOException

Returns a stream that points to the lob data from file at the given offset.

Parameters:

offset - byte offset of the column data in the file.

length - length of the the data.

Throws:

IOException - if any I/O error occurs.

getString

public String getString(long offset,
 int length)
                 throws IOException

Returns the clob data at the given location as String.

Parameters:

offset - byte offset of the column data in the file.

length - length of the the data.

Throws:

IOException - on any I/O error.

getCharacterStream

public Reader getCharacterStream(long offset,
 long length)
                          throws IOException

Returns a stream that points to the clob data from file at the given offset.

Parameters:

offset - byte offset of the column data in the file.

length - length of the the data in bytes.

Throws:

IOException - on any I/O error.

getClobDataLength

public long getClobDataLength(long offset,
 long length)
                       throws IOException

Returns the clob data length in characters at the give location.

Parameters:

offset - byte offset of the column data in the file.

length - length of the the data in bytes.

Throws:

IOException - on any I/O error.

close

public void close()
           throws IOException

Close all the resources realated to the lob file.

Throws:

IOException