btree
Class IndexFileScan

java.lang.Object
  btree.IndexFileScan

Direct Known Subclasses:

BTFileScan

public abstract class IndexFileScan

extends java.lang.Object

Base class for a index file scan

Constructor Summary

IndexFileScan()

Method Summary

abstract void	delete_current() Delete the current record.
abstract KeyDataEntry	get_next() Get the next record.
abstract int	keysize() Returns the size of the key

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexFileScan

public IndexFileScan()

Method Detail

get_next

public abstract KeyDataEntry get_next()
                               throws ScanIteratorException

Get the next record.

Returns:

the KeyDataEntry, which contains the key and data

Throws:

ScanIteratorException - error when iterating through the records

delete_current

public abstract void delete_current()
                             throws ScanDeleteException

Delete the current record.

Throws:

ScanDeleteException - delete current record failed

keysize

public abstract int keysize()

Returns the size of the key

Returns:

the keysize