Package com.semedy.reasoner.edb.persistentstore.bplustree

Class BlockedDataFile

java.lang.Object

com.semedy.reasoner.edb.persistentstore.bplustree.DataFileImp

com.semedy.reasoner.edb.persistentstore.bplustree.BlockedDataFile

All Implemented Interfaces:

DataFile, Closeable, AutoCloseable

public class BlockedDataFile
extends DataFileImp

Manages space in a file. Writes and reads blockwise.
file address is padded and left shifted
leftshift bytes are used to address inside a block.
New data is always appended to file.

Author:

angele

Constructor Summary

Constructors

Constructor	Description
BlockedDataFile(String filePath, int blockSize, boolean compress)

Method Summary

Modifier and Type	Method	Description
void	close()	Close file
Iterator<DataFileElement>	elements()	iterator for file pieces
void	flush()	flush file
byte[]	read(long position)	Reads data at position from file and returns them
long	write(byte[] data)	write data to file.

Methods inherited from class com.semedy.reasoner.edb.persistentstore.bplustree.DataFileImp

checkSanity, checkSanity1, clear, create, delete, free, length, open, readInt, transactionBegin, transactionCommit, transactionRollback, writeCompressed, writeDirect, writeDirect

Methods inherited from class java.lang.Object

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

Constructor Details

BlockedDataFile

public BlockedDataFile(String filePath,
 int blockSize,
 boolean compress)

Parameters:

filePath -

Method Details

read

public byte[] read(long position)
            throws IOException

Reads data at position from file and returns them

Specified by:

read in interface DataFile

Overrides:

read in class DataFileImp

Parameters:

position -

Returns:

Throws:

IOException

close

public void close()
           throws IOException

Close file

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Specified by:

close in interface DataFile

Overrides:

close in class DataFileImp

Throws:

IOException

flush

public void flush()
           throws IOException

flush file

Specified by:

flush in interface DataFile

Overrides:

flush in class DataFileImp

Throws:

IOException

write

public long write(byte[] data)
           throws IOException

write data to file. Returns address of data

Specified by:

write in interface DataFile

Overrides:

write in class DataFileImp

Returns:

Throws:

IOException

elements

public Iterator<DataFileElement> elements()

iterator for file pieces

Specified by:

elements in interface DataFile

Overrides:

elements in class DataFileImp

Returns: