simpledb

Class RecordId

java.lang.Object

simpledb.RecordId

All Implemented Interfaces:

java.io.Serializable

public class RecordId
extends java.lang.Object
implements java.io.Serializable

A RecordId is a reference to a specific tuple on a specific page of a specific table.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private static long	serialVersionUID

Constructor Summary

Constructors

Constructor and Description
RecordId(PageId pid, int tupleno) Creates a new RecordId referring to the specified PageId and tuple number.

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o) Two RecordId objects are considered equal if they represent the same tuple.
PageId	getPageId()
int	hashCode() You should implement the hashCode() so that two equal RecordId instances (with respect to equals()) have the same hashCode().
int	tupleno()

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

RecordId

public RecordId(PageId pid,
                int tupleno)

Creates a new RecordId referring to the specified PageId and tuple number.

Parameters:

pid - the pageid of the page on which the tuple resides

tupleno - the tuple number within the page.

Method Detail

tupleno

public int tupleno()

Returns:

the tuple number this RecordId references.

getPageId

public PageId getPageId()

Returns:

the page id this RecordId references.

equals

public boolean equals(java.lang.Object o)

Two RecordId objects are considered equal if they represent the same tuple.

Overrides:

equals in class java.lang.Object

Returns:

True if this and o represent the same tuple

hashCode

public int hashCode()

You should implement the hashCode() so that two equal RecordId instances (with respect to equals()) have the same hashCode().

Overrides:

hashCode in class java.lang.Object

Returns:

An int that is the same for equal RecordId objects.