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org.globus.ftp
Class FileRandomIO

java.lang.Object
  org.globus.ftp.FileRandomIO

All Implemented Interfaces:

DataSink, DataSource

public class FileRandomIO
extends Object
implements DataSink, DataSource

Thread safe reference implementation of DataSink and DataSource. Implements reading and writing data to a local file. Note: Does not work with Session.STREAM transfer mode, only with GridFTPSession.EBLOCK mode.

Field Summary

protected int	bufferSize
static int	DEFAULT_BUFFER_SIZE
protected RandomAccessFile	file
protected long	offset

Constructor Summary

FileRandomIO(RandomAccessFile file)
Behave like FileRandomIO(file, DEFAULT_BUFFER_SIZE)

FileRandomIO(RandomAccessFile file, int bufferSize)

Method Summary

void	close() Closes the underlying file
Buffer	read() In this implementation, each read() returns data sequentially.
long	totalSize() Optional operation.
void	write(Buffer buffer) Writes the specified buffer to this data sink.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_BUFFER_SIZE

public static final int DEFAULT_BUFFER_SIZE

See Also:

Constant Field Values

bufferSize

protected int bufferSize

file

protected RandomAccessFile file

offset

protected long offset

Constructor Detail

FileRandomIO

public FileRandomIO(RandomAccessFile file)

Behave like FileRandomIO(file, DEFAULT_BUFFER_SIZE)

Parameters:

file - local file that will be be used as data source or destination

FileRandomIO

public FileRandomIO(RandomAccessFile file,
                    int bufferSize)

Parameters:

file - local file that will be be used as data source or destination

bufferSize - size of the buffer returned during single read operation

Method Detail

write

public void write(Buffer buffer)
           throws IOException

Description copied from interface: DataSink

Writes the specified buffer to this data sink.
Note: buffer.getOffset() might return -1 if the transfer mode used does not support data offsets, for example stream transfer mode.

Specified by:

write in interface DataSink

Parameters:

buffer - the data buffer to write.

Throws:

IOException - if an I/O error occurs.

read

public Buffer read()
            throws IOException

In this implementation, each read() returns data sequentially.

Specified by:

read in interface DataSource

Returns:

The data buffer read. Null, if there is no more data to be read.

Throws:

IOException - if an I/O error occurs.

close

public void close()
           throws IOException

Closes the underlying file

Specified by:

close in interface DataSink

Specified by:

close in interface DataSource

Throws:

IOException - if an I/O error occurs.

totalSize

public long totalSize()
               throws IOException

Description copied from interface: DataSource

Optional operation. Returns the total size, in bytes, of the data in this source. If the implementation is not able to provide a total size for the data source, it should return -1

Specified by:

totalSize in interface DataSource

Throws:

IOException - if an I/O exception occurs