org.egothor.cache

Class CachedIListReader

java.lang.Object

org.egothor.cache.CachedIListReader

All Implemented Interfaces:

AutoCloseable, IListItem, IListReader

public class CachedIListReader
extends Object
implements IListReader

Represents a IListReader implementation that uses a cache to retrieve posting lists.

Constructor Summary

Constructors

Constructor and Description
CachedIListReader(CachedRider cachedBarrel, Barrel barrel, String term, int pageSize) Constructor for the CachedIListReader object.

Method Summary

Modifier and Type	Method and Description
void	close() Closes this reader.
long	getPostings() Returns the number of items in the inverted list this object reads (including removed ones).
String	getTerm() Returns the term that owns this inverted list.
boolean	next() Move to the next item in the inverted list.
Proximities	openProx() Returns an access object to the proximity list.
boolean	skipTo(long uid) Skips (forward) in the inverted list to the first item with an ID greater than or equal to the given uid identification.
long	uid() Returns the UID of the current document;
int	weight() Returns the weight of the document.

Methods inherited from class java.lang.Object

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

Constructor Detail

CachedIListReader

public CachedIListReader(CachedRider cachedBarrel,
                         Barrel barrel,
                         String term,
                         int pageSize)

Constructor for the CachedIListReader object.

Parameters:

cachedBarrel - cache used to retrieve inverted list pages

barrel - original barrel that stores the non-cached inverted list

term - term that owns this inverted list

pageSize - size of single cached inverted list partition

Method Detail

next

public boolean next()

Move to the next item in the inverted list.

Specified by:

next in interface IListReader

Returns:

true if the next item exists, false otherwise

skipTo

public boolean skipTo(long uid)

Skips (forward) in the inverted list to the first item with an ID greater than or equal to the given uid identification.

Specified by:

skipTo in interface IListReader

Parameters:

uid - the item to skip to

Returns:

true if the next item exists, false otherwise

uid

public long uid()

Returns the UID of the current document;

Specified by:

uid in interface IListItem

Returns:

uid of the current document

weight

public int weight()

Returns the weight of the document.

Specified by:

weight in interface IListItem

Returns:

weight of the document

openProx

public Proximities openProx()

Returns an access object to the proximity list.

Specified by:

openProx in interface IListItem

Returns:

Proximities object

getPostings

public long getPostings()

Returns the number of items in the inverted list this object reads (including removed ones).

Specified by:

getPostings in interface IListReader

Returns:

the number of items

getTerm

public String getTerm()

Returns the term that owns this inverted list.

Specified by:

getTerm in interface IListReader

Returns:

term that owns this inverted list

close

public void close()

Closes this reader.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface IListReader