Package edu.caltech.nanodb.storage.heapfile

Class HeapFilePageTuple

java.lang.Object

edu.caltech.nanodb.storage.PageTuple

edu.caltech.nanodb.storage.heapfile.HeapFilePageTuple

All Implemented Interfaces:

Tuple, Pinnable

public class HeapFilePageTuple
extends PageTuple

Field Summary

Fields

Modifier and Type	Field	Description
private int	slot	The slot that this tuple corresponds to.

Fields inherited from class edu.caltech.nanodb.storage.PageTuple

NULL_OFFSET

Constructor Summary

Constructors

Constructor	Description
HeapFilePageTuple(Schema schema, DBPage dbPage, int slot, int pageOffset)	Construct a new tuple object that is backed by the data in the database page.

Method Summary

Modifier and Type	Method	Description
protected void	deleteTupleDataRange(int off, int len)
FilePointer	getExternalReference()	This method returns an external reference to the tuple, which references the page number and slot-offset of the tuple.
int	getSlot()
protected void	insertTupleDataRange(int off, int len)
static HeapFilePageTuple	storeNewTuple(Schema schema, DBPage dbPage, int slot, int pageOffset, Tuple tuple)

Methods inherited from class edu.caltech.nanodb.storage.PageTuple

getColumnCount, getColumnValue, getDBPage, getEndOffset, getNullFlagsSize, getOffset, getPinCount, getSchema, getSize, getStorageSize, getTupleStorageSize, isDiskBacked, isNullValue, isPinned, pin, setColumnValue, setNullFlag, storeTuple, toString, unpin, writeNonNullValue

Methods inherited from class java.lang.Object

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

Field Detail

slot

private int slot

The slot that this tuple corresponds to. The tuple doesn't actually manipulate the slot table directly; that is for the IndexedTableManager to deal with.

Constructor Detail

HeapFilePageTuple

public HeapFilePageTuple(Schema schema,
                         DBPage dbPage,
                         int slot,
                         int pageOffset)

Construct a new tuple object that is backed by the data in the database page. This tuple is able to be read from or written to.

Parameters:

schema - the schema of the tuple file the page is a part of

dbPage - the specific database page that holds the tuple

slot - the slot number of the tuple

pageOffset - the offset of the tuple's actual data in the page

Method Detail

getExternalReference

public FilePointer getExternalReference()

This method returns an external reference to the tuple, which references the page number and slot-offset of the tuple.

Specified by:

getExternalReference in interface Tuple

Overrides:

getExternalReference in class PageTuple

Returns:

a file-pointer that can be used to look up this tuple

insertTupleDataRange

protected void insertTupleDataRange(int off,
                                    int len)

Specified by:

insertTupleDataRange in class PageTuple

deleteTupleDataRange

protected void deleteTupleDataRange(int off,
                                    int len)

Specified by:

deleteTupleDataRange in class PageTuple

getSlot

public int getSlot()

storeNewTuple

public static HeapFilePageTuple storeNewTuple(Schema schema,
                                              DBPage dbPage,
                                              int slot,
                                              int pageOffset,
                                              Tuple tuple)