jdbm.helper
Class TupleBrowser<K,V>

java.lang.Object
  jdbm.helper.TupleBrowser<K,V>

public abstract class TupleBrowser<K,V>
extends Object

Browser to traverse a collection of tuples. The browser allows for forward and reverse order traversal.

Author:

Alex Boisvert

Constructor Summary

TupleBrowser()

Method Summary

void	close() Closes the browser and deallocates any resources it might have allocated.
abstract boolean	getNext(Tuple<K,V> tuple) Get the next tuple.
abstract boolean	getPrevious(Tuple<K,V> tuple) Get the previous tuple.

Methods inherited from class java.lang.Object

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

Constructor Detail

TupleBrowser

public TupleBrowser()

Method Detail

getNext

public abstract boolean getNext(Tuple<K,V> tuple)
                         throws IOException

Get the next tuple.

Parameters:

tuple - Tuple into which values are copied.

Returns:

True if values have been copied in tuple, or false if there is no next tuple.

Throws:

IOException

getPrevious

public abstract boolean getPrevious(Tuple<K,V> tuple)
                             throws IOException

Get the previous tuple.

Parameters:

tuple - Tuple into which values are copied.

Returns:

True if values have been copied in tuple, or false if there is no previous tuple.

Throws:

IOException

close

public void close()

Closes the browser and deallocates any resources it might have allocated. Repeated calls of close are OK.