Collaboration diagram for HashBucketPageScanner:

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Public Member Functions
	HashBucketPageScanner ()
	Default Constructor.

	HashBucketPageScanner (HashBucketPage *page)
	Constructor.

	~HashBucketPageScanner ()
	Destructor.

std::pair< SlotId, SlotInfo >	getNext ()
	Returns pair of SlotId and SlotInfo of the next valid slot.

void	reset (HashBucketPage *page)
	Resets the scanner, so it could be used for another Page.

Private Attributes
HashBucketPage *	page
	Page to be scanned. The Page is pinned outside the scope of the scanner.

SlotId	cur_slot
	Current slot being scanned.

Detailed Description

Scanner fo HashBucketPage. Used internally in the HashIndexFile.

Constructor & Destructor Documentation

HashBucketPageScanner::HashBucketPageScanner ( HashBucketPage * page )

Constructor.

Precondition: Valid HashBucketPage* is provided as input. The given Page is pinned.

Postcondition: HashBucketPageScanner is constructed with initialized data members. page is still pinned.

Parameters

page	HashBucketPage object to be scanned.

std::pair< SlotId, SlotInfo > HashBucketPageScanner::getNext ( )

Returns pair of SlotId and SlotInfo of the next valid slot.

Postcondition: SlotId and SlotInfo of the next valid slot is returned. Current slot field is set to the next SlotId. Current slot field may be incremented by more than one. If the scanner reaches the end of the slot directory, INVALID_SLOT_ID is returned. page is still pinned.

Returns: Next valid SlotId and SlotInfo. INVALID_SLOT_ID if the end of the Page is reached. page is still pinned.

void HashBucketPageScanner::reset ( HashBucketPage * page )

Resets the scanner, so it could be used for another Page.

Postcondition: page is set to the provided HashBucketPage* and current slot is reset to 0. The new Page is still pinned.

Parameters

page	HashBucketPage object to reset to.

The documentation for this class was generated from the following file: