simpledb.index.btree
Class BTPageFormatter

java.lang.Object
  simpledb.index.btree.BTPageFormatter

All Implemented Interfaces:

PageFormatter

public class BTPageFormatter
extends java.lang.Object
implements PageFormatter

An object that can format a page to look like an empty B-tree block.

Author:

Edward Sciore

Constructor Summary

BTPageFormatter(TableInfo ti, int flag)
Creates a formatter for a new page of the specified B-tree index.

Method Summary

void	format(Page page) Formats the page by initializing as many index-record slots as possible to have default values.

Methods inherited from class java.lang.Object

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

Constructor Detail

BTPageFormatter

public BTPageFormatter(TableInfo ti,
                       int flag)

Creates a formatter for a new page of the specified B-tree index.

Parameters:

ti - the index's metadata

flag - the page's initial flag value

Method Detail

format

public void format(Page page)

Formats the page by initializing as many index-record slots as possible to have default values. Each integer field is given a value of 0, and each string field is given a value of "". The location that indicates the number of records in the page is also set to 0.

Specified by:

format in interface PageFormatter

Parameters:

page - a buffer page

See Also:

PageFormatter.format(simpledb.file.Page)