org.mbari.siam.core
Class DeviceLogData

java.lang.Object
  org.mbari.siam.core.DeviceLogData

public class DeviceLogData
extends java.lang.Object

This class implements the serialized class storage and retrieval functions needed by the DeviceLog class.

Author:

Tim Meese

See Also:

DeviceLog

Field Summary

protected long	_currentDataFileExtent
protected java.io.RandomAccessFile	_dataFile
protected long	_deviceId
protected int	_segment

Constructor Summary

protected	DeviceLogData(long deviceId, int segmentNumber, java.lang.String directory) default constructor
protected	DeviceLogData(long deviceId, int segmentNumber, java.lang.String suffix, java.lang.String directory)

Method Summary

protected void	appendLogData(byte[] serializedData, DeviceLogIndex.Entry indexEntry) this routine appends a byte array of serialized class data to the data log according to the information contained in the DeviceLogIndex.Entry that is passed in
protected void	close() Close the data file.
protected java.io.FileInputStream	getFileInputStream()
protected long	getFilePointer()
protected long	getLength()
protected int	readBytes(byte[] buf, int offset, int bytes)
protected byte[]	readLogData(DeviceLogIndex.Entry indexEntry) this routine reads a byte array of serialized class data from the data log according to the information contained in the DeviceLogIndex.Entry that is passed in
protected void	seek(long pos)

Methods inherited from class java.lang.Object

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

Field Detail

_dataFile

protected java.io.RandomAccessFile _dataFile

_deviceId

protected long _deviceId

_segment

protected int _segment

_currentDataFileExtent

protected long _currentDataFileExtent

Constructor Detail

DeviceLogData

protected DeviceLogData(long deviceId,
                        int segmentNumber,
                        java.lang.String directory)
                 throws java.io.FileNotFoundException,
                        java.io.IOException

default constructor

Parameters:

deviceId - ISI Device ID

segmentNumber - segment number

Throws:

java.io.FileNotFoundException

java.io.IOException

DeviceLogData

protected DeviceLogData(long deviceId,
                        int segmentNumber,
                        java.lang.String suffix,
                        java.lang.String directory)
                 throws java.io.FileNotFoundException,
                        java.io.IOException

Throws:

java.io.FileNotFoundException

java.io.IOException

Method Detail

appendLogData

protected void appendLogData(byte[] serializedData,
                             DeviceLogIndex.Entry indexEntry)

this routine appends a byte array of serialized class data to the data log according to the information contained in the DeviceLogIndex.Entry that is passed in

Parameters:

indexEntry - index entry used to write data

See Also:

DeviceLogIndex.Entry

readLogData

protected byte[] readLogData(DeviceLogIndex.Entry indexEntry)

this routine reads a byte array of serialized class data from the data log according to the information contained in the DeviceLogIndex.Entry that is passed in

Parameters:

indexEntry - index entry used to read data

See Also:

DeviceLogIndex.Entry

close

protected void close()
              throws java.io.IOException

Close the data file. This DeviceLogData instance is no longer usable after close() has been called.

Throws:

java.io.IOException

seek

protected void seek(long pos)
             throws java.io.IOException

Throws:

java.io.IOException

getLength

protected long getLength()
                  throws java.io.IOException

Throws:

java.io.IOException

getFilePointer

protected long getFilePointer()
                       throws java.io.IOException

Throws:

java.io.IOException

readBytes

protected int readBytes(byte[] buf,
                        int offset,
                        int bytes)
                 throws java.io.IOException

Throws:

java.io.IOException

getFileInputStream

protected java.io.FileInputStream getFileInputStream()
                                              throws java.io.IOException

Throws:

java.io.IOException