org.egothor.core
Class IListRemapper

java.lang.Object
  org.egothor.core.IListShadow
      org.egothor.core.IListRemapper

All Implemented Interfaces:

IListItem, IListReader

public abstract class IListRemapper
extends IListShadow

This object remaps the document uids to new values in the inverted list. This action is offered to a barrel that has many removed documents.

The final inverted list that Remapper generates is a list that would exist if the barrel did not contain any removed documents and the first document had uid=0.

Author:

Leo Galambos

Constructor Summary

IListRemapper(IListReader orig)
Constructor for the Remapper object.

Method Summary

boolean	next() Get a next item of an inverted list and remap it.
abstract boolean	removed(long uid) Test whether the specified document has been removed.
boolean	skipTo(long uid) This method is not supported.
long	uid() Identification of the document.

Methods inherited from class org.egothor.core.IListShadow

close, getPostings, getTerm, openProx, setSource, weight

Methods inherited from class java.lang.Object

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

Constructor Detail

IListRemapper

public IListRemapper(IListReader orig)

Constructor for the Remapper object.

Parameters:

orig - the IListReader used by this object to read inverted lists

Method Detail

skipTo

public boolean skipTo(long uid)

This method is not supported.

Specified by:

skipTo in interface IListReader

Overrides:

skipTo in class IListShadow

Parameters:

uid - parameter

Returns:

item

uid

public long uid()

Description copied from interface: IListItem

Identification of the document. If this value is lower than 0, then this item ought to be supposed to be invalid.

Specified by:

uid in interface IListItem

Overrides:

uid in class IListShadow

next

public boolean next()

Get a next item of an inverted list and remap it.

Specified by:

next in interface IListReader

Overrides:

next in class IListShadow

Returns:

item

removed

public abstract boolean removed(long uid)

Test whether the specified document has been removed. If it was, it would caused some shift in the numbering (covered by IListRemapper object).

Parameters:

uid - the document in question

Returns:

true if document has been removed, false otherwise