index
Class HashScan

java.lang.Object
  index.HashScan

All Implemented Interfaces:

GlobalConst

public class HashScan
extends java.lang.Object
implements GlobalConst

A HashScan object is created only through the function openScan() in the HashIndex class. It supports the getNext interface which will simply retrieve the next record in the file.

Field Summary

Fields inherited from interface global.GlobalConst

EMPTY_SLOT, FIRST_PAGEID, INVALID_PAGEID, MAX_COLSIZE, MAX_TUPSIZE, NAME_MAXLEN, PAGE_SIZE, PIN_DISKIO, PIN_MEMCPY, UNPIN_CLEAN, UNPIN_DIRTY

Method Summary

void	close() Closes the index scan, releasing any pinned pages.
RID	getNext() Gets the next entry's record in the index scan.
boolean	hasNext() Returns true if there are more entries to scan, false otherwise.

Methods inherited from class java.lang.Object

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

Method Detail

close

public void close()

Closes the index scan, releasing any pinned pages.

hasNext

public boolean hasNext()

Returns true if there are more entries to scan, false otherwise.

getNext

public RID getNext()

Gets the next entry's record in the index scan.

Throws:

java.lang.IllegalStateException - if the scan has no more entries